Overhauling certlib.

LICENSE to Apache 2.0.

.circleci/config.yml

@@ -5,6 +5,30 @@ version: 2.1
 # Define a job to be invoked later in a workflow.
 # See: https://circleci.com/docs/2.0/configuration-reference/#jobs
 jobs:
+  lint:
+    working_directory: ~/repo
+    docker:
+      - image: cimg/go:1.22.2
+    steps:
+      - checkout
+      - restore_cache:
+          keys:
+            - go-mod-v4-{{ checksum "go.sum" }}
+      - run:
+          name: Install Dependencies
+          command: go mod download
+      - save_cache:
+          key: go-mod-v4-{{ checksum "go.sum" }}
+          paths:
+            - "/go/pkg/mod"
+      - run:
+          name: Install golangci-lint
+          command: |
+            curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(go env GOPATH)/bin
+      - run:
+          name: Run golangci-lint
+          command: golangci-lint run --timeout=5m
+
   testbuild:
     working_directory: ~/repo
     # Specify the execution environment. You can specify an image from Dockerhub or use one of our Convenience Images from CircleCI's Developer Hub.
@@ -27,16 +51,17 @@ jobs:
             - "/go/pkg/mod"
       - run:
           name: Run tests
-          command: go test ./...
+          command: go test -race ./...
       - run:
           name: Run build
           command: go build ./...
       - store_test_results:
           path: /tmp/test-reports
-
 # Invoke jobs via workflows
 # See: https://circleci.com/docs/2.0/configuration-reference/#workflows
+# Linting is disabled while cleanups are ongoing.
 workflows:
   testbuild:
     jobs:
       - testbuild
+#      - lint

.gitignore

@@ -1,4 +1 @@
-bazel-bin
+.idea
-bazel-goutils
-bazel-out
-bazel-testlogs

.golangci.yml

@@ -1,87 +1,475 @@
-run:
+# This file is licensed under the terms of the MIT license https://opensource.org/license/mit
-  timeout: 5m
+# Copyright (c) 2021-2025 Marat Reymers
-  tests: true
+
-  build-tags: []
+## Golden config for golangci-lint v2.6.2
-  modules-download-mode: readonly
+#
+# This is the best config for golangci-lint based on my experience and opinion.
+# It is very strict, but not extremely strict.
+# Feel free to adapt it to suit your needs.
+# If this config helps you, please consider keeping a link to this file (see the next comment).
+
+# Based on https://gist.github.com/maratori/47a4d00457a92aa426dbd48a18776322
+
+version: "2"
+
+issues:
+  # Maximum count of issues with the same text.
+  # Set to 0 to disable.
+  # Default: 3
+  max-same-issues: 50
+
+formatters:
+  enable:
+    - goimports # checks if the code and import statements are formatted according to the 'goimports' command
+    - golines # checks if code is formatted, and fixes long lines
+
+    ## you may want to enable
+    #- gci # checks if code and import statements are formatted, with additional rules
+    #- gofmt # checks if the code is formatted according to 'gofmt' command
+    #- gofumpt # enforces a stricter format than 'gofmt', while being backwards compatible
+    #- swaggo # formats swaggo comments
+
+  # All settings can be found here https://github.com/golangci/golangci-lint/blob/HEAD/.golangci.reference.yml
+  settings:
+    goimports:
+      # A list of prefixes, which, if set, checks import paths
+      # with the given prefixes are grouped after 3rd-party packages.
+      # Default: []
+      local-prefixes:
+        - github.com/my/project
+
+    golines:
+      # Target maximum line length.
+      # Default: 100
+      max-len: 120
 
 linters:
   enable:
-    - errcheck
+    - asasalint # checks for pass []any as any in variadic func(...any)
-    - gosimple
+    - asciicheck # checks that your code does not contain non-ASCII identifiers
-    - govet
+    - bidichk # checks for dangerous unicode character sequences
-    - ineffassign
+    - bodyclose # checks whether HTTP response body is closed successfully
-    - staticcheck
+    - canonicalheader # checks whether net/http.Header uses canonical header
-    - unused
+    - copyloopvar # detects places where loop variables are copied (Go 1.22+)
-    - gofmt
+    - cyclop # checks function and package cyclomatic complexity
-    - goimports
+    - depguard # checks if package imports are in a list of acceptable packages
-    - misspell
+    - dupl # tool for code clone detection
-    - unparam
+    - durationcheck # checks for two durations multiplied together
-    - unconvert
+    - errcheck # checking for unchecked errors, these unchecked errors can be critical bugs in some cases
-    - goconst
+    - errname # checks that sentinel errors are prefixed with the Err and error types are suffixed with the Error
-    - gocyclo
+    - errorlint # finds code that will cause problems with the error wrapping scheme introduced in Go 1.13
-    - gosec
+    - exhaustive # checks exhaustiveness of enum switch statements
-    - prealloc
+    - exptostd # detects functions from golang.org/x/exp/ that can be replaced by std functions
-    - copyloopvar
+    - fatcontext # detects nested contexts in loops
-    - revive
+    - forbidigo # forbids identifiers
-    - typecheck
+    - funcorder # checks the order of functions, methods, and constructors
+    - funlen # tool for detection of long functions
+    - gocheckcompilerdirectives # validates go compiler directive comments (//go:)
+    - gochecksumtype # checks exhaustiveness on Go "sum types"
+    - gocognit # computes and checks the cognitive complexity of functions
+    - goconst # finds repeated strings that could be replaced by a constant
+    - gocritic # provides diagnostics that check for bugs, performance and style issues
+    - gocyclo # computes and checks the cyclomatic complexity of functions
+    - godoclint # checks Golang's documentation practice
+    - godot # checks if comments end in a period
+    - gomoddirectives # manages the use of 'replace', 'retract', and 'excludes' directives in go.mod
+    - goprintffuncname # checks that printf-like functions are named with f at the end
+    - gosec # inspects source code for security problems
+    - govet # reports suspicious constructs, such as Printf calls whose arguments do not align with the format string
+    - iface # checks the incorrect use of interfaces, helping developers avoid interface pollution
+    - ineffassign # detects when assignments to existing variables are not used
+    - intrange # finds places where for loops could make use of an integer range
+    - iotamixing # checks if iotas are being used in const blocks with other non-iota declarations
+    - loggercheck # checks key value pairs for common logger libraries (kitlog,klog,logr,zap)
+    - makezero # finds slice declarations with non-zero initial length
+    - mirror # reports wrong mirror patterns of bytes/strings usage
+    - mnd # detects magic numbers
+    - modernize # suggests simplifications to Go code, using modern language and library features
+    - musttag # enforces field tags in (un)marshaled structs
+    - nakedret # finds naked returns in functions greater than a specified function length
+    - nestif # reports deeply nested if statements
+    - nilerr # finds the code that returns nil even if it checks that the error is not nil
+    - nilnesserr # reports that it checks for err != nil, but it returns a different nil value error (powered by nilness and nilerr)
+    - nilnil # checks that there is no simultaneous return of nil error and an invalid value
+    - noctx # finds sending http request without context.Context
+    - nolintlint # reports ill-formed or insufficient nolint directives
+    - nonamedreturns # reports all named returns
+    - nosprintfhostport # checks for misuse of Sprintf to construct a host with port in a URL
+    - perfsprint # checks that fmt.Sprintf can be replaced with a faster alternative
+    - predeclared # finds code that shadows one of Go's predeclared identifiers
+    - promlinter # checks Prometheus metrics naming via promlint
+    - protogetter # reports direct reads from proto message fields when getters should be used
+    - reassign # checks that package variables are not reassigned
+    - recvcheck # checks for receiver type consistency
+    - revive # fast, configurable, extensible, flexible, and beautiful linter for Go, drop-in replacement of golint
+    - rowserrcheck # checks whether Err of rows is checked successfully
+    - sloglint # ensure consistent code style when using log/slog
+    - spancheck # checks for mistakes with OpenTelemetry/Census spans
+    - sqlclosecheck # checks that sql.Rows and sql.Stmt are closed
+    - staticcheck # is a go vet on steroids, applying a ton of static analysis checks
+    - testableexamples # checks if examples are testable (have an expected output)
+    - testifylint # checks usage of github.com/stretchr/testify
+    - testpackage # makes you use a separate _test package
+    - tparallel # detects inappropriate usage of t.Parallel() method in your Go test codes
+    - unconvert # removes unnecessary type conversions
+    - unparam # reports unused function parameters
+    - unqueryvet # detects SELECT * in SQL queries and SQL builders, encouraging explicit column selection
+    - unused # checks for unused constants, variables, functions and types
+    - usestdlibvars # detects the possibility to use variables/constants from the Go standard library
+    - usetesting # reports uses of functions with replacement inside the testing package
+    - wastedassign # finds wasted assignment statements
+    - whitespace # detects leading and trailing whitespace
 
-linters-settings:
+    ## you may want to enable
-  gocyclo:
+    #- arangolint # opinionated best practices for arangodb client
-    min-complexity: 15
+    #- decorder # checks declaration order and count of types, constants, variables and functions
-  
+    #- exhaustruct # [highly recommend to enable] checks if all structure fields are initialized
-  goconst:
+    #- ginkgolinter # [if you use ginkgo/gomega] enforces standards of using ginkgo and gomega
-    min-len: 3
+    #- godox # detects usage of FIXME, TODO and other keywords inside comments
-    min-occurrences: 3
+    #- goheader # checks is file header matches to pattern
-  
+    #- inamedparam # [great idea, but too strict, need to ignore a lot of cases by default] reports interfaces with unnamed method parameters
-  misspell:
+    #- interfacebloat # checks the number of methods inside an interface
-    locale: US
+    #- ireturn # accept interfaces, return concrete types
-  
+    #- noinlineerr # disallows inline error handling `if err := ...; err != nil {`
-  revive:
+    #- prealloc # [premature optimization, but can be used in some cases] finds slice declarations that could potentially be preallocated
-    rules:
+    #- tagalign # checks that struct tags are well aligned
-      - name: exported
+    #- varnamelen # [great idea, but too many false positives] checks that the length of a variable's name matches its scope
-        disabled: false
+    #- wrapcheck # checks that errors returned from external packages are wrapped
-      - name: error-return
+    #- zerologlint # detects the wrong usage of zerolog that a user forgets to dispatch zerolog.Event
-      - name: error-naming
-      - name: if-return
-      - name: var-naming
-      - name: package-comments
-        disabled: true
-      - name: indent-error-flow
-      - name: context-as-argument
-  
-  gosec:
-    excludes:
-      - G304  # File path from variable (common in file utilities)
-      - G404  # Use of weak random (acceptable for non-crypto use)
 
-issues:
+    ## disabled
-  exclude-rules:
+    #- containedctx # detects struct contained context.Context field
-    # Exclude some linters from running on tests files
+    #- contextcheck # [too many false positives] checks the function whether use a non-inherited context
-    - path: _test\.go
+    #- dogsled # checks assignments with too many blank identifiers (e.g. x, _, _, _, := f())
-      linters:
+    #- dupword # [useless without config] checks for duplicate words in the source code
-        - gocyclo
+    #- err113 # [too strict] checks the errors handling expressions
-        - errcheck
+    #- errchkjson # [don't see profit + I'm against of omitting errors like in the first example https://github.com/breml/errchkjson] checks types passed to the json encoding functions. Reports unsupported types and optionally reports occasions, where the check for the returned error can be omitted
-        - gosec
+    #- forcetypeassert # [replaced by errcheck] finds forced type assertions
-    
+    #- gomodguard # [use more powerful depguard] allow and block lists linter for direct Go module dependencies
-    # Exclude embedded content from checks
+    #- gosmopolitan # reports certain i18n/l10n anti-patterns in your Go codebase
-    - path: ".*\\.txt$"
+    #- grouper # analyzes expression groups
-      linters:
+    #- importas # enforces consistent import aliases
+    #- lll # [replaced by golines] reports long lines
+    #- maintidx # measures the maintainability index of each function
+    #- misspell # [useless] finds commonly misspelled English words in comments
+    #- nlreturn # [too strict and mostly code is not more readable] checks for a new line before return and branch statements to increase code clarity
+    #- paralleltest # [too many false positives] detects missing usage of t.Parallel() method in your Go test
+    #- tagliatelle # checks the struct tags
+    #- thelper # detects golang test helpers without t.Helper() call and checks the consistency of test helpers
+    #- wsl # [too strict and mostly code is not more readable] whitespace linter forces you to use empty lines
+    #- wsl_v5 # [too strict and mostly code is not more readable] add or remove empty lines
+
+  # All settings can be found here https://github.com/golangci/golangci-lint/blob/HEAD/.golangci.reference.yml
+  settings:
+    cyclop:
+      # The maximal code complexity to report.
+      # Default: 10
+      max-complexity: 30
+      # The maximal average package complexity.
+      # If it's higher than 0.0 (float) the check is enabled.
+      # Default: 0.0
+      package-average: 10.0
+
+    depguard:
+      # Rules to apply.
+      #
+      # Variables:
+      # - File Variables
+      #   Use an exclamation mark `!` to negate a variable.
+      #   Example: `!$test` matches any file that is not a go test file.
+      #
+      #   `$all` - matches all go files
+      #   `$test` - matches all go test files
+      #
+      # - Package Variables
+      #
+      #   `$gostd` - matches all of go's standard library (Pulled from `GOROOT`)
+      #
+      # Default (applies if no custom rules are defined): Only allow $gostd in all files.
+      rules:
+        "deprecated":
+          # List of file globs that will match this list of settings to compare against.
+          # By default, if a path is relative, it is relative to the directory where the golangci-lint command is executed.
+          # The placeholder '${base-path}' is substituted with a path relative to the mode defined with `run.relative-path-mode`.
+          # The placeholder '${config-path}' is substituted with a path relative to the configuration file.
+          # Default: $all
+          files:
+            - "$all"
+          # List of packages that are not allowed.
+          # Entries can be a variable (starting with $), a string prefix, or an exact match (if ending with $).
+          # Default: []
+          deny:
+            - pkg: github.com/golang/protobuf
+              desc: Use google.golang.org/protobuf instead, see https://developers.google.com/protocol-buffers/docs/reference/go/faq#modules
+            - pkg: github.com/satori/go.uuid
+              desc: Use github.com/google/uuid instead, satori's package is not maintained
+            - pkg: github.com/gofrs/uuid$
+              desc: Use github.com/gofrs/uuid/v5 or later, it was not a go module before v5
+        "non-test files":
+          files:
+            - "!$test"
+          deny:
+            - pkg: math/rand$
+              desc: Use math/rand/v2 instead, see https://go.dev/blog/randv2
+        "non-main files":
+          files:
+            - "!**/main.go"
+          deny:
+            - pkg: log$
+              desc: Use log/slog instead, see https://go.dev/blog/slog
+
+    embeddedstructfieldcheck:
+      # Checks that sync.Mutex and sync.RWMutex are not used as embedded fields.
+      # Default: false
+      forbid-mutex: true
+
+    errcheck:
+      # Report about not checking of errors in type assertions: `a := b.(MyStruct)`.
+      # Such cases aren't reported by default.
+      # Default: false
+      check-type-assertions: true
+      exclude-functions:
+        - (*git.wntrmute.dev/kyle/goutils/sbuf.Buffer).Write
+
+    exhaustive:
+      # Program elements to check for exhaustiveness.
+      # Default: [ switch ]
+      check:
+        - switch
+        - map
+
+    exhaustruct:
+      # List of regular expressions to match type names that should be excluded from processing.
+      # Anonymous structs can be matched by '<anonymous>' alias.
+      # Has precedence over `include`.
+      # Each regular expression must match the full type name, including package path.
+      # For example, to match type `net/http.Cookie` regular expression should be `.*/http\.Cookie`,
+      # but not `http\.Cookie`.
+      # Default: []
+      exclude:
+        # std libs
+        - ^net/http.Client$
+        - ^net/http.Cookie$
+        - ^net/http.Request$
+        - ^net/http.Response$
+        - ^net/http.Server$
+        - ^net/http.Transport$
+        - ^net/url.URL$
+        - ^os/exec.Cmd$
+        - ^reflect.StructField$
+        # public libs
+        - ^github.com/Shopify/sarama.Config$
+        - ^github.com/Shopify/sarama.ProducerMessage$
+        - ^github.com/mitchellh/mapstructure.DecoderConfig$
+        - ^github.com/prometheus/client_golang/.+Opts$
+        - ^github.com/spf13/cobra.Command$
+        - ^github.com/spf13/cobra.CompletionOptions$
+        - ^github.com/stretchr/testify/mock.Mock$
+        - ^github.com/testcontainers/testcontainers-go.+Request$
+        - ^github.com/testcontainers/testcontainers-go.FromDockerfile$
+        - ^golang.org/x/tools/go/analysis.Analyzer$
+        - ^google.golang.org/protobuf/.+Options$
+        - ^gopkg.in/yaml.v3.Node$
+      # Allows empty structures in return statements.
+      # Default: false
+      allow-empty-returns: true
+
+    funcorder:
+      # Checks if the exported methods of a structure are placed before the non-exported ones.
+      # Default: true
+      struct-method: false
+
+    funlen:
+      # Checks the number of lines in a function.
+      # If lower than 0, disable the check.
+      # Default: 60
+      lines: 100
+      # Checks the number of statements in a function.
+      # If lower than 0, disable the check.
+      # Default: 40
+      statements: 50
+
+    gochecksumtype:
+      # Presence of `default` case in switch statements satisfies exhaustiveness, if all members are not listed.
+      # Default: true
+      default-signifies-exhaustive: false
+
+    gocognit:
+      # Minimal code complexity to report.
+      # Default: 30 (but we recommend 10-20)
+      min-complexity: 20
+
+    gocritic:
+      # Settings passed to gocritic.
+      # The settings key is the name of a supported gocritic checker.
+      # The list of supported checkers can be found at https://go-critic.com/overview.
+      settings:
+        captLocal:
+          # Whether to restrict checker to params only.
+          # Default: true
+          paramsOnly: false
+        underef:
+          # Whether to skip (*x).method() calls where x is a pointer receiver.
+          # Default: true
+          skipRecvDeref: false
+
+    godoclint:
+      # List of rules to enable in addition to the default set.
+      # Default: empty
+      enable:
+        # Assert no unused link in godocs.
+        # https://github.com/godoc-lint/godoc-lint?tab=readme-ov-file#no-unused-link
+        - no-unused-link
+
+    govet:
+      # Enable all analyzers.
+      # Default: false
+      enable-all: true
+      # Disable analyzers by name.
+      # Run `GL_DEBUG=govet golangci-lint run --enable=govet` to see default, all available analyzers, and enabled analyzers.
+      # Default: []
+      disable:
+        - fieldalignment # too strict
+      # Settings per analyzer.
+      settings:
+        shadow:
+          # Whether to be strict about shadowing; can be noisy.
+          # Default: false
+          strict: true
+
+    inamedparam:
+      # Skips check for interface methods with only a single parameter.
+      # Default: false
+      skip-single-param: true
+
+    mnd:
+      ignored-functions:
+        - args.Error
+        - flag.Arg
+        - flag.Duration.*
+        - flag.Float.*
+        - flag.Int.*
+        - flag.Uint.*
+        - os.Chmod
+        - os.Mkdir.*
+        - os.OpenFile
+        - os.WriteFile
+        - prometheus.ExponentialBuckets.*
+        - prometheus.LinearBuckets
+
+    nakedret:
+      # Make an issue if func has more lines of code than this setting, and it has naked returns.
+      # Default: 30
+      max-func-lines: 0
+
+    nolintlint:
+      # Exclude the following linters from requiring an explanation.
+      # Default: []
+      allow-no-explanation: [ funlen, gocognit, golines ]
+      # Enable to require an explanation of nonzero length after each nolint directive.
+      # Default: false
+      require-explanation: true
+      # Enable to require nolint directives to mention the specific linter being suppressed.
+      # Default: false
+      require-specific: true
+
+    perfsprint:
+      # Optimizes into strings concatenation.
+      # Default: true
+      strconcat: false
+
+    reassign:
+      # Patterns for global variable names that are checked for reassignment.
+      # See https://github.com/curioswitch/go-reassign#usage
+      # Default: ["EOF", "Err.*"]
+      patterns:
+        - ".*"
+
+    rowserrcheck:
+      # database/sql is always checked.
+      # Default: []
+      packages:
+        - github.com/jmoiron/sqlx
+
+    sloglint:
+      # Enforce not using global loggers.
+      # Values:
+      # - "": disabled
+      # - "all": report all global loggers
+      # - "default": report only the default slog logger
+      # https://github.com/go-simpler/sloglint?tab=readme-ov-file#no-global
+      # Default: ""
+      no-global: all
+      # Enforce using methods that accept a context.
+      # Values:
+      # - "": disabled
+      # - "all": report all contextless calls
+      # - "scope": report only if a context exists in the scope of the outermost function
+      # https://github.com/go-simpler/sloglint?tab=readme-ov-file#context-only
+      # Default: ""
+      context: scope
+
+    staticcheck:
+      # SAxxxx checks in https://staticcheck.dev/docs/configuration/options/#checks
+      # Example (to disable some checks): [ "all", "-SA1000", "-SA1001"]
+      # Default: ["all", "-ST1000", "-ST1003", "-ST1016", "-ST1020", "-ST1021", "-ST1022"]
+      checks:
         - all
-    
+        # Incorrect or missing package comment.
-    # Ignore deprecation warnings in legacy code if needed
+        # https://staticcheck.dev/docs/checks/#ST1000
-    - linters:
+        - -ST1000
-        - staticcheck
+        # Use consistent method receiver names.
-      text: "SA1019"
+        # https://staticcheck.dev/docs/checks/#ST1016
-  
+        - -ST1016
-  # Maximum issues count per one linter
+        # Omit embedded fields from selector expression.
-  max-issues-per-linter: 0
+        # https://staticcheck.dev/docs/checks/#QF1008
-  
+        - -QF1008
-  # Maximum count of issues with the same text
-  max-same-issues: 0
 
-output:
+    usetesting:
-  formats:
+      # Enable/disable `os.TempDir()` detections.
-    - format: colored-line-number
+      # Default: false
-      path: stdout
+      os-temp-dir: true
-  print-issued-lines: true
+
-  print-linter-name: true
+  exclusions:
+    # Log a warning if an exclusion rule is unused.
+    # Default: false
+    warn-unused: true
+    # Predefined exclusion rules.
+    # Default: []
+    presets:
+      - std-error-handling
+      - common-false-positives
+    rules:
+      - path: 'ahash/ahash.go'
+        linters: [ staticcheck, gosec ]
+      - path: 'backoff/backoff_test.go'
+        linters: [ testpackage ]
+      - path: 'dbg/dbg_test.go'
+        linters: [ testpackage ]
+      - path: 'log/logger.go'
+        linters: [ forbidigo ]
+      - path: 'logging/example_test.go'
+        linters: [ testableexamples ]
+      - source: 'TODO'
+        linters: [ godot ]
+      - text: 'should have a package comment'
+        linters: [ revive ]
+      - text: 'exported \S+ \S+ should have comment( \(or a comment on this block\))? or be unexported'
+        linters: [ revive ]
+      - text: 'package comment should be of the form ".+"'
+        source: '// ?(nolint|TODO)'
+        linters: [ revive ]
+      - text: 'comment on exported \S+ \S+ should be of the form ".+"'
+        source: '// ?(nolint|TODO)'
+        linters: [ revive, staticcheck ]
+      - path: '_test\.go'
+        linters:
+          - bodyclose
+          - dupl
+          - errcheck
+          - funlen
+          - goconst
+          - gosec
+          - noctx
+          - reassign
+          - wrapcheck

.travis.yml

@@ -1,26 +0,0 @@
-arch:
-   - amd64
-   - ppc64le
-sudo: false
-language: go
-go:
-  - tip
-  - 1.9
-jobs:
- exclude:
-  - go: 1.9
-    arch: amd64
-  - go: 1.9
-    arch: ppc64le
-script: 
-  - go get golang.org/x/lint/golint
-  - go get golang.org/x/tools/cmd/cover
-  - go get github.com/kisom/goutils/... 
-  - go test -cover github.com/kisom/goutils/... 
-  - golint github.com/kisom/goutils/... 
-notifications:
-  email:
-    recipients:
-      - coder@kyleisom.net
-    on_success: change
-    on_failure: change

CHANGELOG

@@ -1,3 +1,21 @@
+Unreleased - 2025-11-15
+
+"Error handling modernization" (in progress)
+
+- Introduced typed, wrapped errors via certlib/certerr.Error (Source, Kind, Op, Err) with Unwrap.
+- Standardized helper constructors: DecodeError, ParsingError, VerifyError, LoadingError.
+- Preserved sentinel errors (e.g., ErrEncryptedPrivateKey, ErrInvalidPEMType, ErrEmptyCertificate) for errors.Is.
+- Refactored certlib to use certerr in key paths (CSR parsing/verification, PEM cert pool, certificate read/load).
+- Migrated logging/file.go and cmd/kgz away from github.com/pkg/errors to stdlib wrapping.
+- Removed dependency on github.com/pkg/errors; ran go mod tidy.
+- Added package docs for certerr and a README section on error handling and matching.
+- Added unit tests for certerr (Is/As and message formatting).
+
+Planned next steps:
+- Continue refactoring remaining error paths for consistent wrapping.
+- Add focused tests for key flows (encrypted private key, CSR invalid PEM types, etc.).
+- Run golangci-lint (errorlint, errcheck) and address findings.
+
 Release 1.2.1 - 2018-09-15
 
 + Add missing format argument to Errorf call in kgz.

LICENSE

@@ -1,19 +1,194 @@
-Copyright (c) 2015-2023 Kyle Isom <kyle@tyrfingr.is>
+   Copyright 2025 K. Isom <kyle@imap.cc>
 
-Permission to use, copy, modify, and distribute this software for any
+   Licensed under the Apache License, Version 2.0 (the "License");
-purpose with or without fee is hereby granted, provided that the above 
+   you may not use this file except in compliance with the License.
-copyright notice and this permission notice appear in all copies.
+   You may obtain a copy of the License at
 
-THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+       http://www.apache.org/licenses/LICENSE-2.0
-WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 
 
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
+      publicly display, publicly perform, sublicense, and distribute the
+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
+          attribution notices from the Source form of the Work,
+          excluding those notices that do not pertain to any part of
+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
+          distribution, then any Derivative Works that You distribute must
+          include a readable copy of the attribution notices contained
+          within such NOTICE file, excluding those notices that do not
+          pertain to any part of the Derivative Works, in at least one
+          of the following places: within a NOTICE text file distributed
+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
+          within a display generated by the Derivative Works, if and
+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
 
 =======================================================================
+
 The backoff package (written during my time at Cloudflare) is released
 under the following license:
 

README.md

@@ -78,3 +78,43 @@ Each program should have a small README in the directory with more
 information.
 
 All code here is licensed under the ISC license.
+
+
+Error handling
+--------------
+
+This repo standardizes on Go 1.13+ error wrapping and matching. Libraries and
+CLIs should:
+
+- Wrap causes with context using `fmt.Errorf("context: %w", err)`.
+- Use typed, structured errors from `certlib/certerr` for certificate-related
+  operations. These include a typed `*certerr.Error` with `Source` and `Kind`.
+- Match errors programmatically:
+  - `errors.Is(err, certerr.ErrEncryptedPrivateKey)` to detect sentinel states.
+  - `errors.As(err, &e)` (where `var e *certerr.Error`) to inspect
+    `e.Source`/`e.Kind`.
+
+Examples:
+
+```
+cert, err := certlib.LoadCertificate(path)
+if err != nil {
+    // sentinel match
+    if errors.Is(err, certerr.ErrEmptyCertificate) {
+        // handle empty input
+    }
+
+    // typed error match
+    var ce *certerr.Error
+    if errors.As(err, &ce) {
+        switch ce.Kind {
+        case certerr.KindParse:
+            // parse error handling
+        case certerr.KindLoad:
+            // file loading error handling
+        }
+    }
+}
+```
+
+Avoid including sensitive data (keys, passwords, tokens) in error messages.

ahash/ahash.go

@@ -4,8 +4,8 @@
 package ahash
 
 import (
-	"crypto/md5"
+	"crypto/md5"  // #nosec G505
-	"crypto/sha1"
+	"crypto/sha1" // #nosec G501
 	"crypto/sha256"
 	"crypto/sha512"
 	"errors"
@@ -17,34 +17,15 @@ import (
 	"io"
 	"sort"
 
-	"git.wntrmute.dev/kyle/goutils/assert"
 	"golang.org/x/crypto/blake2b"
 	"golang.org/x/crypto/blake2s"
-	"golang.org/x/crypto/md4"
+	"golang.org/x/crypto/md4"       // #nosec G506
-	"golang.org/x/crypto/ripemd160"
+	"golang.org/x/crypto/ripemd160" // #nosec G507
 	"golang.org/x/crypto/sha3"
+
+	"git.wntrmute.dev/kyle/goutils/assert"
 )
 
-func sha224Slicer(bs []byte) []byte {
-	sum := sha256.Sum224(bs)
-	return sum[:]
-}
-
-func sha256Slicer(bs []byte) []byte {
-	sum := sha256.Sum256(bs)
-	return sum[:]
-}
-
-func sha384Slicer(bs []byte) []byte {
-	sum := sha512.Sum384(bs)
-	return sum[:]
-}
-
-func sha512Slicer(bs []byte) []byte {
-	sum := sha512.Sum512(bs)
-	return sum[:]
-}
-
 // Hash represents a generic hash function that may or may not be secure. It
 // satisfies the hash.Hash interface.
 type Hash struct {
@@ -247,17 +228,17 @@ func init() {
 // HashList returns a sorted list of all the hash algorithms supported by the
 // package.
 func HashList() []string {
-	return hashList[:]
+	return hashList
 }
 
 // SecureHashList returns a sorted list of all the secure (cryptographic) hash
 // algorithms supported by the package.
 func SecureHashList() []string {
-	return secureHashList[:]
+	return secureHashList
 }
 
 // InsecureHashList returns a sorted list of all the insecure hash algorithms
 // supported by the package.
 func InsecureHashList() []string {
-	return insecureHashList[:]
+	return insecureHashList
 }

ahash/ahash_test.go

@@ -1,16 +1,18 @@
-package ahash
+package ahash_test
 
 import (
 	"bytes"
+	"encoding/hex"
 	"fmt"
 	"testing"
 
+	"git.wntrmute.dev/kyle/goutils/ahash"
 	"git.wntrmute.dev/kyle/goutils/assert"
 )
 
 func TestSecureHash(t *testing.T) {
 	algo := "sha256"
-	h, err := New(algo)
+	h, err := ahash.New(algo)
 	assert.NoErrorT(t, err)
 	assert.BoolT(t, h.IsSecure(), algo+" should be a secure hash")
 	assert.BoolT(t, h.HashAlgo() == algo, "hash returned the wrong HashAlgo")
@@ -19,28 +21,28 @@ func TestSecureHash(t *testing.T) {
 
 	var data []byte
 	var expected = "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
-	sum, err := Sum(algo, data)
+	sum, err := ahash.Sum(algo, data)
 	assert.NoErrorT(t, err)
-	assert.BoolT(t, fmt.Sprintf("%x", sum) == expected, fmt.Sprintf("expected hash %s but have %x", expected, sum))
+	assert.BoolT(t, hex.EncodeToString(sum) == expected, fmt.Sprintf("expected hash %s but have %x", expected, sum))
 
 	data = []byte("hello, world")
 	buf := bytes.NewBuffer(data)
 	expected = "09ca7e4eaa6e8ae9c7d261167129184883644d07dfba7cbfbc4c8a2e08360d5b"
-	sum, err = SumReader(algo, buf)
+	sum, err = ahash.SumReader(algo, buf)
 	assert.NoErrorT(t, err)
-	assert.BoolT(t, fmt.Sprintf("%x", sum) == expected, fmt.Sprintf("expected hash %s but have %x", expected, sum))
+	assert.BoolT(t, hex.EncodeToString(sum) == expected, fmt.Sprintf("expected hash %s but have %x", expected, sum))
 
 	data = []byte("hello world")
 	_, err = h.Write(data)
 	assert.NoErrorT(t, err)
 	unExpected := "09ca7e4eaa6e8ae9c7d261167129184883644d07dfba7cbfbc4c8a2e08360d5b"
 	sum = h.Sum(nil)
-	assert.BoolT(t, fmt.Sprintf("%x", sum) != unExpected, fmt.Sprintf("hash shouldn't have returned %x", unExpected))
+	assert.BoolT(t, hex.EncodeToString(sum) != unExpected, fmt.Sprintf("hash shouldn't have returned %x", unExpected))
 }
 
 func TestInsecureHash(t *testing.T) {
 	algo := "md5"
-	h, err := New(algo)
+	h, err := ahash.New(algo)
 	assert.NoErrorT(t, err)
 	assert.BoolT(t, !h.IsSecure(), algo+" shouldn't be a secure hash")
 	assert.BoolT(t, h.HashAlgo() == algo, "hash returned the wrong HashAlgo")
@@ -49,28 +51,28 @@ func TestInsecureHash(t *testing.T) {
 
 	var data []byte
 	var expected = "d41d8cd98f00b204e9800998ecf8427e"
-	sum, err := Sum(algo, data)
+	sum, err := ahash.Sum(algo, data)
 	assert.NoErrorT(t, err)
-	assert.BoolT(t, fmt.Sprintf("%x", sum) == expected, fmt.Sprintf("expected hash %s but have %x", expected, sum))
+	assert.BoolT(t, hex.EncodeToString(sum) == expected, fmt.Sprintf("expected hash %s but have %x", expected, sum))
 
 	data = []byte("hello, world")
 	buf := bytes.NewBuffer(data)
 	expected = "e4d7f1b4ed2e42d15898f4b27b019da4"
-	sum, err = SumReader(algo, buf)
+	sum, err = ahash.SumReader(algo, buf)
 	assert.NoErrorT(t, err)
-	assert.BoolT(t, fmt.Sprintf("%x", sum) == expected, fmt.Sprintf("expected hash %s but have %x", expected, sum))
+	assert.BoolT(t, hex.EncodeToString(sum) == expected, fmt.Sprintf("expected hash %s but have %x", expected, sum))
 
 	data = []byte("hello world")
 	_, err = h.Write(data)
 	assert.NoErrorT(t, err)
 	unExpected := "e4d7f1b4ed2e42d15898f4b27b019da4"
 	sum = h.Sum(nil)
-	assert.BoolT(t, fmt.Sprintf("%x", sum) != unExpected, fmt.Sprintf("hash shouldn't have returned %x", unExpected))
+	assert.BoolT(t, hex.EncodeToString(sum) != unExpected, fmt.Sprintf("hash shouldn't have returned %x", unExpected))
 }
 
 func TestHash32(t *testing.T) {
 	algo := "crc32-ieee"
-	h, err := New(algo)
+	h, err := ahash.New(algo)
 	assert.NoErrorT(t, err)
 	assert.BoolT(t, !h.IsSecure(), algo+" shouldn't be a secure hash")
 	assert.BoolT(t, h.HashAlgo() == algo, "hash returned the wrong HashAlgo")
@@ -102,7 +104,7 @@ func TestHash32(t *testing.T) {
 
 func TestHash64(t *testing.T) {
 	algo := "crc64"
-	h, err := New(algo)
+	h, err := ahash.New(algo)
 	assert.NoErrorT(t, err)
 	assert.BoolT(t, !h.IsSecure(), algo+" shouldn't be a secure hash")
 	assert.BoolT(t, h.HashAlgo() == algo, "hash returned the wrong HashAlgo")
@@ -133,9 +135,9 @@ func TestHash64(t *testing.T) {
 }
 
 func TestListLengthSanity(t *testing.T) {
-	all := HashList()
+	all := ahash.HashList()
-	secure := SecureHashList()
+	secure := ahash.SecureHashList()
-	insecure := InsecureHashList()
+	insecure := ahash.InsecureHashList()
 
 	assert.BoolT(t, len(all) == len(secure)+len(insecure))
 }
@@ -146,11 +148,11 @@ func TestSumLimitedReader(t *testing.T) {
 	extendedData := bytes.NewBufferString("hello, world! this is an extended message")
 	expected := "09ca7e4eaa6e8ae9c7d261167129184883644d07dfba7cbfbc4c8a2e08360d5b"
 
-	hash, err := SumReader("sha256", data)
+	hash, err := ahash.SumReader("sha256", data)
 	assert.NoErrorT(t, err)
-	assert.BoolT(t, fmt.Sprintf("%x", hash) == expected, fmt.Sprintf("have hash %x, want %s", hash, expected))
+	assert.BoolT(t, hex.EncodeToString(hash) == expected, fmt.Sprintf("have hash %x, want %s", hash, expected))
 
-	extendedHash, err := SumLimitedReader("sha256", extendedData, int64(dataLen))
+	extendedHash, err := ahash.SumLimitedReader("sha256", extendedData, int64(dataLen))
 	assert.NoErrorT(t, err)
 
 	assert.BoolT(t, bytes.Equal(hash, extendedHash), fmt.Sprintf("have hash %x, want %x", extendedHash, hash))

assert/assert.go

@@ -9,6 +9,7 @@
 package assert
 
 import (
+	"errors"
 	"fmt"
 	"os"
 	"runtime"
@@ -16,11 +17,13 @@ import (
 	"testing"
 )
 
+const callerSkip = 2
+
 // NoDebug can be set to true to cause all asserts to be ignored.
 var NoDebug bool
 
 func die(what string, a ...string) {
-	_, file, line, ok := runtime.Caller(2)
+	_, file, line, ok := runtime.Caller(callerSkip)
 	if !ok {
 		panic(what)
 	}
@@ -31,30 +34,32 @@ func die(what string, a ...string) {
 			s = ": " + s
 		}
 		panic(what + s)
-	} else {
-		fmt.Fprintf(os.Stderr, "%s", what)
-		if len(a) > 0 {
-			s := strings.Join(a, ", ")
-			fmt.Fprintln(os.Stderr, ": "+s)
-		} else {
-			fmt.Fprintf(os.Stderr, "\n")
-		}
-
-		fmt.Fprintf(os.Stderr, "\t%s line %d\n", file, line)
-
-		os.Exit(1)
 	}
+
+	fmt.Fprintf(os.Stderr, "%s", what)
+	if len(a) > 0 {
+		s := strings.Join(a, ", ")
+		fmt.Fprintln(os.Stderr, ": "+s)
+	} else {
+		fmt.Fprintf(os.Stderr, "\n")
+	}
+
+	fmt.Fprintf(os.Stderr, "\t%s line %d\n", file, line)
+
+	os.Exit(1)
 }
 
 // Bool asserts that cond is false.
 //
 // For example, this would replace
-//    if x < 0 {
+//
-//            log.Fatal("x is subzero")
+//	if x < 0 {
-//    }
+//	        log.Fatal("x is subzero")
+//	}
 //
 // The same assertion would be
-//    assert.Bool(x, "x is subzero")
+//
+//	assert.Bool(x, "x is subzero")
 func Bool(cond bool, s ...string) {
 	if NoDebug {
 		return
@@ -68,11 +73,12 @@ func Bool(cond bool, s ...string) {
 // Error asserts that err is not nil, e.g. that an error has occurred.
 //
 // For example,
-//     if err == nil {
+//
-//             log.Fatal("call to <something> should have failed")
+//	if err == nil {
-//     }
+//	        log.Fatal("call to <something> should have failed")
-//     // becomes
+//	}
-//     assert.Error(err, "call to <something> should have failed")
+//	// becomes
+//	assert.Error(err, "call to <something> should have failed")
 func Error(err error, s ...string) {
 	if NoDebug {
 		return
@@ -100,7 +106,7 @@ func NoError(err error, s ...string) {
 
 // ErrorEq asserts that the actual error is the expected error.
 func ErrorEq(expected, actual error) {
-	if NoDebug || (expected == actual) {
+	if NoDebug || (errors.Is(expected, actual)) {
 		return
 	}
 
@@ -155,7 +161,7 @@ func NoErrorT(t *testing.T, err error) {
 // ErrorEqT compares a pair of errors, calling Fatal on it if they
 // don't match.
 func ErrorEqT(t *testing.T, expected, actual error) {
-	if NoDebug || (expected == actual) {
+	if NoDebug || (errors.Is(expected, actual)) {
 		return
 	}
 

backoff/backoff.go

@@ -10,29 +10,21 @@
 // backoff is configured with a maximum duration that will not be
 // exceeded.
 //
-// The `New` function will attempt to use the system's cryptographic
+// This package uses math/rand/v2 for jitter, which is automatically
-// random number generator to seed a Go math/rand random number
+// seeded from a cryptographically secure source.
-// source. If this fails, the package will panic on startup.
 package backoff
 
 import (
-	"crypto/rand"
-	"encoding/binary"
-	"io"
 	"math"
-	mrand "math/rand"
+	"math/rand/v2"
-	"sync"
 	"time"
 )
 
-var prngMu sync.Mutex
-var prng *mrand.Rand
-
 // DefaultInterval is used when a Backoff is initialised with a
 // zero-value Interval.
 var DefaultInterval = 5 * time.Minute
 
-// DefaultMaxDuration is maximum amount of time that the backoff will
+// DefaultMaxDuration is the maximum amount of time that the backoff will
 // delay for.
 var DefaultMaxDuration = 6 * time.Hour
 
@@ -50,10 +42,9 @@ type Backoff struct {
 	// interval controls the time step for backing off.
 	interval time.Duration
 
-	// noJitter controls whether to use the "Full Jitter"
+	// noJitter controls whether to use the "Full Jitter" improvement to attempt
-	// improvement to attempt to smooth out spikes in a high
+	// to smooth out spikes in a high-contention scenario. If noJitter is set to
-	// contention scenario. If noJitter is set to true, no
+	// true, no jitter will be introduced.
-	// jitter will be introduced.
 	noJitter bool
 
 	// decay controls the decay of n. If it is non-zero, n is
@@ -65,17 +56,17 @@ type Backoff struct {
 	lastTry time.Time
 }
 
-// New creates a new backoff with the specified max duration and
+// New creates a new backoff with the specified maxDuration duration and
 // interval. Zero values may be used to use the default values.
 //
-// Panics if either max or interval is negative.
+// Panics if either dMax or interval is negative.
-func New(max time.Duration, interval time.Duration) *Backoff {
+func New(dMax time.Duration, interval time.Duration) *Backoff {
-	if max < 0 || interval < 0 {
+	if dMax < 0 || interval < 0 {
-		panic("backoff: max or interval is negative")
+		panic("backoff: dMax or interval is negative")
 	}
 
 	b := &Backoff{
-		maxDuration: max,
+		maxDuration: dMax,
 		interval:    interval,
 	}
 	b.setup()
@@ -84,27 +75,12 @@ func New(max time.Duration, interval time.Duration) *Backoff {
 
 // NewWithoutJitter works similarly to New, except that the created
 // Backoff will not use jitter.
-func NewWithoutJitter(max time.Duration, interval time.Duration) *Backoff {
+func NewWithoutJitter(dMax time.Duration, interval time.Duration) *Backoff {
-	b := New(max, interval)
+	b := New(dMax, interval)
 	b.noJitter = true
 	return b
 }
 
-func init() {
-	var buf [8]byte
-	var n int64
-
-	_, err := io.ReadFull(rand.Reader, buf[:])
-	if err != nil {
-		panic(err.Error())
-	}
-
-	n = int64(binary.LittleEndian.Uint64(buf[:]))
-
-	src := mrand.NewSource(n)
-	prng = mrand.New(src)
-}
-
 func (b *Backoff) setup() {
 	if b.interval == 0 {
 		b.interval = DefaultInterval
@@ -122,35 +98,44 @@ func (b *Backoff) Duration() time.Duration {
 
 	b.decayN()
 
-	t := b.duration(b.n)
+	d := b.duration(b.n)
 
 	if b.n < math.MaxUint64 {
 		b.n++
 	}
 
 	if !b.noJitter {
-		prngMu.Lock()
+		d = time.Duration(rand.Int64N(int64(d))) // #nosec G404
-		t = time.Duration(prng.Int63n(int64(t)))
-		prngMu.Unlock()
 	}
 
-	return t
+	return d
 }
 
+const maxN uint64 = 63
+
 // requires b to be locked.
-func (b *Backoff) duration(n uint64) (t time.Duration) {
+func (b *Backoff) duration(n uint64) time.Duration {
-	// Saturate pow
+	// Use left shift on the underlying integer representation to avoid
-	pow := time.Duration(math.MaxInt64)
+	// multiplying time.Duration by time.Duration (which is semantically
-	if n < 63 {
+	// incorrect and flagged by linters).
-		pow = 1 << n
+	if n >= maxN {
+		// Saturate when n would overflow a 64-bit shift or exceed maxDuration.
+		return b.maxDuration
 	}
 
-	t = b.interval * pow
+	// Calculate 2^n * interval using a shift. Detect overflow by checking
-	if t/pow != b.interval || t > b.maxDuration {
+	// for sign change or monotonicity loss and clamp to maxDuration.
-		t = b.maxDuration
+	shifted := b.interval << n
+	if shifted < 0 || shifted < b.interval {
+		// Overflow occurred during the shift; clamp to maxDuration.
+		return b.maxDuration
 	}
 
-	return
+	if shifted > b.maxDuration {
+		return b.maxDuration
+	}
+
+	return shifted
 }
 
 // Reset resets the attempt counter of a backoff.
@@ -174,7 +159,7 @@ func (b *Backoff) SetDecay(decay time.Duration) {
 	b.decay = decay
 }
 
-// requires b to be locked
+// requires b to be locked.
 func (b *Backoff) decayN() {
 	if b.decay == 0 {
 		return
@@ -186,7 +171,9 @@ func (b *Backoff) decayN() {
 	}
 
 	lastDuration := b.duration(b.n - 1)
-	decayed := time.Since(b.lastTry) > lastDuration+b.decay
+	// Reset when the elapsed time is at least the previous backoff plus decay.
+	// Using ">=" avoids boundary flakiness in tests and real usage.
+	decayed := time.Since(b.lastTry) >= lastDuration+b.decay
 	b.lastTry = time.Now()
 
 	if !decayed {

backoff/backoff_test.go

@@ -9,7 +9,7 @@ import (
 
 // If given New with 0's and no jitter, ensure that certain invariants are met:
 //
-//   - the default max duration and interval should be used
+//   - the default maxDuration duration and interval should be used
 //   - noJitter should be true
 //   - the RNG should not be initialised
 //   - the first duration should be equal to the default interval
@@ -17,7 +17,11 @@ func TestDefaults(t *testing.T) {
 	b := NewWithoutJitter(0, 0)
 
 	if b.maxDuration != DefaultMaxDuration {
-		t.Fatalf("expected new backoff to use the default max duration (%s), but have %s", DefaultMaxDuration, b.maxDuration)
+		t.Fatalf(
+			"expected new backoff to use the default maxDuration duration (%s), but have %s",
+			DefaultMaxDuration,
+			b.maxDuration,
+		)
 	}
 
 	if b.interval != DefaultInterval {
@@ -44,11 +48,11 @@ func TestSetup(t *testing.T) {
 	}
 }
 
-// Ensure that tries incremenets as expected.
+// Ensure that tries increments as expected.
 func TestTries(t *testing.T) {
 	b := NewWithoutJitter(5, 1)
 
-	for i := uint64(0); i < 3; i++ {
+	for i := range uint64(3) {
 		if b.n != i {
 			t.Fatalf("want tries=%d, have tries=%d", i, b.n)
 		}
@@ -73,7 +77,7 @@ func TestTries(t *testing.T) {
 func TestReset(t *testing.T) {
 	const iter = 10
 	b := New(1000, 1)
-	for i := 0; i < iter; i++ {
+	for range iter {
 		_ = b.Duration()
 	}
 
@@ -88,17 +92,17 @@ func TestReset(t *testing.T) {
 }
 
 const decay = 5 * time.Millisecond
-const max = 10 * time.Millisecond
+const maxDuration = 10 * time.Millisecond
 const interval = time.Millisecond
 
 func TestDecay(t *testing.T) {
 	const iter = 10
 
-	b := NewWithoutJitter(max, 1)
+	b := NewWithoutJitter(maxDuration, 1)
 	b.SetDecay(decay)
 
 	var backoff time.Duration
-	for i := 0; i < iter; i++ {
+	for range iter {
 		backoff = b.Duration()
 	}
 
@@ -127,7 +131,7 @@ func TestDecaySaturation(t *testing.T) {
 	b.SetDecay(decay)
 
 	var duration time.Duration
-	for i := 0; i <= 2; i++ {
+	for range 3 {
 		duration = b.Duration()
 	}
 
@@ -145,7 +149,7 @@ func TestDecaySaturation(t *testing.T) {
 }
 
 func ExampleBackoff_SetDecay() {
-	b := NewWithoutJitter(max, interval)
+	b := NewWithoutJitter(maxDuration, interval)
 	b.SetDecay(decay)
 
 	// try 0

certlib/certerr/doc.go

@@ -0,0 +1,33 @@
+// Package certerr provides typed errors and helpers for certificate-related
+// operations across the repository. It standardizes error construction and
+// matching so callers can reliably branch on error source/kind using the
+// Go 1.13+ `errors.Is` and `errors.As` helpers.
+//
+// Guidelines
+//   - Always wrap underlying causes using the helper constructors or with
+//     fmt.Errorf("context: %w", err).
+//   - Do not include sensitive data (keys, passwords, tokens) in error
+//     messages; add only non-sensitive, actionable context.
+//   - Prefer programmatic checks via errors.Is (for sentinel errors) and
+//     errors.As (to retrieve *certerr.Error) rather than relying on error
+//     string contents.
+//
+// Typical usage
+//
+//	if err := doParse(); err != nil {
+//	    return certerr.ParsingError(certerr.ErrorSourceCertificate, err)
+//	}
+//
+// Callers may branch on error kinds and sources:
+//
+//	var e *certerr.Error
+//	if errors.As(err, &e) {
+//	    switch e.Kind {
+//	    case certerr.KindParse:
+//	        // handle parse error
+//	    }
+//	}
+//
+// Sentinel errors are provided for common conditions like
+// `certerr.ErrEncryptedPrivateKey` and can be matched with `errors.Is`.
+package certerr

certlib/certerr/errors.go

@@ -37,6 +37,48 @@ const (
 	ErrorSourceKeypair     ErrorSourceType = 5
 )
 
+// ErrorKind is a broad classification describing what went wrong.
+type ErrorKind uint8
+
+const (
+	KindParse ErrorKind = iota + 1
+	KindDecode
+	KindVerify
+	KindLoad
+)
+
+func (k ErrorKind) String() string {
+	switch k {
+	case KindParse:
+		return "parse"
+	case KindDecode:
+		return "decode"
+	case KindVerify:
+		return "verify"
+	case KindLoad:
+		return "load"
+	default:
+		return "unknown"
+	}
+}
+
+// Error is a typed, wrapped error with structured context for programmatic checks.
+// It implements error and supports errors.Is/As via Unwrap.
+type Error struct {
+	Source ErrorSourceType // which domain produced the error (certificate, private key, etc.)
+	Kind   ErrorKind       // operation category (parse, decode, verify, load)
+	Op     string          // optional operation or function name
+	Err    error           // wrapped cause
+}
+
+func (e *Error) Error() string {
+	// Keep message format consistent with existing helpers: "failed to <kind> <source>: <err>"
+	// Do not include Op by default to preserve existing output expectations.
+	return fmt.Sprintf("failed to %s %s: %v", e.Kind.String(), e.Source.String(), e.Err)
+}
+
+func (e *Error) Unwrap() error { return e.Err }
+
 // InvalidPEMType is used to indicate that we were expecting one type of PEM
 // file, but saw another.
 type InvalidPEMType struct {
@@ -61,19 +103,19 @@ func ErrInvalidPEMType(have string, want ...string) error {
 }
 
 func LoadingError(t ErrorSourceType, err error) error {
-	return fmt.Errorf("failed to load %s from disk: %w", t, err)
+	return &Error{Source: t, Kind: KindLoad, Err: err}
 }
 
 func ParsingError(t ErrorSourceType, err error) error {
-	return fmt.Errorf("failed to parse %s: %w", t, err)
+	return &Error{Source: t, Kind: KindParse, Err: err}
 }
 
 func DecodeError(t ErrorSourceType, err error) error {
-	return fmt.Errorf("failed to decode %s: %w", t, err)
+	return &Error{Source: t, Kind: KindDecode, Err: err}
 }
 
 func VerifyError(t ErrorSourceType, err error) error {
-	return fmt.Errorf("failed to verify %s: %w", t, err)
+	return &Error{Source: t, Kind: KindVerify, Err: err}
 }
 
 var ErrEncryptedPrivateKey = errors.New("private key is encrypted")

certlib/certerr/errors_test.go

@@ -0,0 +1,55 @@
+package certerr
+
+import (
+	"errors"
+	"strings"
+	"testing"
+)
+
+func TestTypedErrorWrappingAndFormatting(t *testing.T) {
+	cause := errors.New("bad data")
+	err := DecodeError(ErrorSourceCertificate, cause)
+
+	// Ensure we can retrieve the typed error
+	var e *Error
+	if !errors.As(err, &e) {
+		t.Fatalf("expected errors.As to retrieve *certerr.Error, got %T", err)
+	}
+	if e.Kind != KindDecode {
+		t.Fatalf("unexpected kind: %v", e.Kind)
+	}
+	if e.Source != ErrorSourceCertificate {
+		t.Fatalf("unexpected source: %v", e.Source)
+	}
+
+	// Check message format (no trailing punctuation enforced by content)
+	msg := e.Error()
+	if !strings.Contains(msg, "failed to decode certificate") || !strings.Contains(msg, "bad data") {
+		t.Fatalf("unexpected error message: %q", msg)
+	}
+}
+
+func TestErrorsIsOnWrappedSentinel(t *testing.T) {
+	err := DecodeError(ErrorSourcePrivateKey, ErrEncryptedPrivateKey)
+	if !errors.Is(err, ErrEncryptedPrivateKey) {
+		t.Fatalf("expected errors.Is to match ErrEncryptedPrivateKey")
+	}
+}
+
+func TestInvalidPEMTypeMessageSingle(t *testing.T) {
+	err := ErrInvalidPEMType("FOO", "CERTIFICATE")
+	want := "invalid PEM type: have FOO, expected CERTIFICATE"
+	if err.Error() != want {
+		t.Fatalf("unexpected error message: got %q, want %q", err.Error(), want)
+	}
+}
+
+func TestInvalidPEMTypeMessageMultiple(t *testing.T) {
+	err := ErrInvalidPEMType("FOO", "CERTIFICATE", "NEW CERTIFICATE REQUEST")
+	if !strings.Contains(
+		err.Error(),
+		"invalid PEM type: have FOO, expected one of CERTIFICATE, NEW CERTIFICATE REQUEST",
+	) {
+		t.Fatalf("unexpected error message: %q", err.Error())
+	}
+}

certlib/certlib.go

@@ -4,7 +4,7 @@ import (
 	"crypto/x509"
 	"encoding/pem"
 	"errors"
-	"io/ioutil"
+	"os"
 
 	"git.wntrmute.dev/kyle/goutils/certlib/certerr"
 )
@@ -13,28 +13,31 @@ import (
 // byte slice.
 func ReadCertificate(in []byte) (cert *x509.Certificate, rest []byte, err error) {
 	if len(in) == 0 {
-		err = certerr.ErrEmptyCertificate
+		return nil, nil, certerr.ParsingError(certerr.ErrorSourceCertificate, certerr.ErrEmptyCertificate)
-		return
 	}
 
 	if in[0] == '-' {
 		p, remaining := pem.Decode(in)
 		if p == nil {
-			err = errors.New("certlib: invalid PEM file")
+			return nil, nil, certerr.ParsingError(certerr.ErrorSourceCertificate, errors.New("invalid PEM file"))
-			return
 		}
 
 		rest = remaining
 		if p.Type != "CERTIFICATE" {
-			err = certerr.ErrInvalidPEMType(p.Type, "CERTIFICATE")
+			return nil, rest, certerr.ParsingError(
-			return
+				certerr.ErrorSourceCertificate,
+				certerr.ErrInvalidPEMType(p.Type, "CERTIFICATE"),
+			)
 		}
 
 		in = p.Bytes
 	}
 
 	cert, err = x509.ParseCertificate(in)
-	return
+	if err != nil {
+		return nil, rest, certerr.ParsingError(certerr.ErrorSourceCertificate, err)
+	}
+	return cert, rest, nil
 }
 
 // ReadCertificates tries to read all the certificates in a
@@ -64,9 +67,9 @@ func ReadCertificates(in []byte) (certs []*x509.Certificate, err error) {
 // the file contains multiple certificates (e.g. a chain), only the
 // first certificate is returned.
 func LoadCertificate(path string) (*x509.Certificate, error) {
-	in, err := ioutil.ReadFile(path)
+	in, err := os.ReadFile(path)
 	if err != nil {
-		return nil, err
+		return nil, certerr.LoadingError(certerr.ErrorSourceCertificate, err)
 	}
 
 	cert, _, err := ReadCertificate(in)
@@ -76,9 +79,9 @@ func LoadCertificate(path string) (*x509.Certificate, error) {
 // LoadCertificates tries to read all the certificates in a file,
 // returning them in the order that it found them in the file.
 func LoadCertificates(path string) ([]*x509.Certificate, error) {
-	in, err := ioutil.ReadFile(path)
+	in, err := os.ReadFile(path)
 	if err != nil {
-		return nil, err
+		return nil, certerr.LoadingError(certerr.ErrorSourceCertificate, err)
 	}
 
 	return ReadCertificates(in)

certlib/helpers.go

@@ -65,10 +65,10 @@ const OneYear = 8760 * time.Hour
 // OneDay is a time.Duration representing a day's worth of seconds.
 const OneDay = 24 * time.Hour
 
-// DelegationUsage  is the OID for the DelegationUseage extensions
+// DelegationUsage  is the OID for the DelegationUseage extensions.
 var DelegationUsage = asn1.ObjectIdentifier{1, 3, 6, 1, 4, 1, 44363, 44}
 
-// DelegationExtension
+// DelegationExtension.
 var DelegationExtension = pkix.Extension{
 	Id:       DelegationUsage,
 	Critical: false,
@@ -89,24 +89,28 @@ var Jul2012 = InclusiveDate(2012, time.July, 01)
 // issuing certificates valid for more than 39 months.
 var Apr2015 = InclusiveDate(2015, time.April, 01)
 
-// KeyLength returns the bit size of ECDSA or RSA PublicKey
+// KeyLength returns the bit size of ECDSA or RSA PublicKey.
-func KeyLength(key interface{}) int {
+func KeyLength(key any) int {
-	if key == nil {
+	switch k := key.(type) {
+	case *ecdsa.PublicKey:
+		if k == nil {
+			return 0
+		}
+		return k.Curve.Params().BitSize
+	case *rsa.PublicKey:
+		if k == nil {
+			return 0
+		}
+		return k.N.BitLen()
+	default:
 		return 0
 	}
-	if ecdsaKey, ok := key.(*ecdsa.PublicKey); ok {
-		return ecdsaKey.Curve.Params().BitSize
-	} else if rsaKey, ok := key.(*rsa.PublicKey); ok {
-		return rsaKey.N.BitLen()
-	}
-
-	return 0
 }
 
 // ExpiryTime returns the time when the certificate chain is expired.
 func ExpiryTime(chain []*x509.Certificate) (notAfter time.Time) {
 	if len(chain) == 0 {
-		return
+		return notAfter
 	}
 
 	notAfter = chain[0].NotAfter
@@ -115,7 +119,7 @@ func ExpiryTime(chain []*x509.Certificate) (notAfter time.Time) {
 			notAfter = cert.NotAfter
 		}
 	}
-	return
+	return notAfter
 }
 
 // MonthsValid returns the number of months for which a certificate is valid.
@@ -144,109 +148,99 @@ func ValidExpiry(c *x509.Certificate) bool {
 		maxMonths = 39
 	case issued.After(Jul2012):
 		maxMonths = 60
-	case issued.Before(Jul2012):
+	default:
 		maxMonths = 120
 	}
 
-	if MonthsValid(c) > maxMonths {
+	return MonthsValid(c) <= maxMonths
-		return false
+}
-	}
+
-	return true
+// SignatureString returns the TLS signature string corresponding to
+// an X509 signature algorithm.
+var signatureString = map[x509.SignatureAlgorithm]string{
+	x509.MD2WithRSA:      "MD2WithRSA",
+	x509.MD5WithRSA:      "MD5WithRSA",
+	x509.SHA1WithRSA:     "SHA1WithRSA",
+	x509.SHA256WithRSA:   "SHA256WithRSA",
+	x509.SHA384WithRSA:   "SHA384WithRSA",
+	x509.SHA512WithRSA:   "SHA512WithRSA",
+	x509.DSAWithSHA1:     "DSAWithSHA1",
+	x509.DSAWithSHA256:   "DSAWithSHA256",
+	x509.ECDSAWithSHA1:   "ECDSAWithSHA1",
+	x509.ECDSAWithSHA256: "ECDSAWithSHA256",
+	x509.ECDSAWithSHA384: "ECDSAWithSHA384",
+	x509.ECDSAWithSHA512: "ECDSAWithSHA512",
 }
 
 // SignatureString returns the TLS signature string corresponding to
 // an X509 signature algorithm.
 func SignatureString(alg x509.SignatureAlgorithm) string {
-	switch alg {
+	if s, ok := signatureString[alg]; ok {
-	case x509.MD2WithRSA:
+		return s
-		return "MD2WithRSA"
-	case x509.MD5WithRSA:
-		return "MD5WithRSA"
-	case x509.SHA1WithRSA:
-		return "SHA1WithRSA"
-	case x509.SHA256WithRSA:
-		return "SHA256WithRSA"
-	case x509.SHA384WithRSA:
-		return "SHA384WithRSA"
-	case x509.SHA512WithRSA:
-		return "SHA512WithRSA"
-	case x509.DSAWithSHA1:
-		return "DSAWithSHA1"
-	case x509.DSAWithSHA256:
-		return "DSAWithSHA256"
-	case x509.ECDSAWithSHA1:
-		return "ECDSAWithSHA1"
-	case x509.ECDSAWithSHA256:
-		return "ECDSAWithSHA256"
-	case x509.ECDSAWithSHA384:
-		return "ECDSAWithSHA384"
-	case x509.ECDSAWithSHA512:
-		return "ECDSAWithSHA512"
-	default:
-		return "Unknown Signature"
 	}
+	return "Unknown Signature"
+}
+
+// HashAlgoString returns the hash algorithm name contains in the signature
+// method.
+var hashAlgoString = map[x509.SignatureAlgorithm]string{
+	x509.MD2WithRSA:      "MD2",
+	x509.MD5WithRSA:      "MD5",
+	x509.SHA1WithRSA:     "SHA1",
+	x509.SHA256WithRSA:   "SHA256",
+	x509.SHA384WithRSA:   "SHA384",
+	x509.SHA512WithRSA:   "SHA512",
+	x509.DSAWithSHA1:     "SHA1",
+	x509.DSAWithSHA256:   "SHA256",
+	x509.ECDSAWithSHA1:   "SHA1",
+	x509.ECDSAWithSHA256: "SHA256",
+	x509.ECDSAWithSHA384: "SHA384",
+	x509.ECDSAWithSHA512: "SHA512",
 }
 
 // HashAlgoString returns the hash algorithm name contains in the signature
 // method.
 func HashAlgoString(alg x509.SignatureAlgorithm) string {
-	switch alg {
+	if s, ok := hashAlgoString[alg]; ok {
-	case x509.MD2WithRSA:
+		return s
-		return "MD2"
-	case x509.MD5WithRSA:
-		return "MD5"
-	case x509.SHA1WithRSA:
-		return "SHA1"
-	case x509.SHA256WithRSA:
-		return "SHA256"
-	case x509.SHA384WithRSA:
-		return "SHA384"
-	case x509.SHA512WithRSA:
-		return "SHA512"
-	case x509.DSAWithSHA1:
-		return "SHA1"
-	case x509.DSAWithSHA256:
-		return "SHA256"
-	case x509.ECDSAWithSHA1:
-		return "SHA1"
-	case x509.ECDSAWithSHA256:
-		return "SHA256"
-	case x509.ECDSAWithSHA384:
-		return "SHA384"
-	case x509.ECDSAWithSHA512:
-		return "SHA512"
-	default:
-		return "Unknown Hash Algorithm"
 	}
+	return "Unknown Hash Algorithm"
 }
 
 // StringTLSVersion returns underlying enum values from human names for TLS
-// versions, defaults to current golang default of TLS 1.0
+// versions, defaults to current golang default of TLS 1.0.
 func StringTLSVersion(version string) uint16 {
 	switch version {
+	case "1.3":
+		return tls.VersionTLS13
 	case "1.2":
 		return tls.VersionTLS12
 	case "1.1":
 		return tls.VersionTLS11
+	case "1.0":
+		return tls.VersionTLS10
 	default:
+		// Default to Go's historical default of TLS 1.0 for unknown values
 		return tls.VersionTLS10
 	}
 }
 
-// EncodeCertificatesPEM encodes a number of x509 certificates to PEM
+// EncodeCertificatesPEM encodes a number of x509 certificates to PEM.
 func EncodeCertificatesPEM(certs []*x509.Certificate) []byte {
 	var buffer bytes.Buffer
 	for _, cert := range certs {
-		pem.Encode(&buffer, &pem.Block{
+		if err := pem.Encode(&buffer, &pem.Block{
 			Type:  "CERTIFICATE",
 			Bytes: cert.Raw,
-		})
+		}); err != nil {
+			return nil
+		}
 	}
 
 	return buffer.Bytes()
 }
 
-// EncodeCertificatePEM encodes a single x509 certificates to PEM
+// EncodeCertificatePEM encodes a single x509 certificates to PEM.
 func EncodeCertificatePEM(cert *x509.Certificate) []byte {
 	return EncodeCertificatesPEM([]*x509.Certificate{cert})
 }
@@ -269,7 +263,10 @@ func ParseCertificatesPEM(certsPEM []byte) ([]*x509.Certificate, error) {
 		certs = append(certs, cert...)
 	}
 	if len(certsPEM) > 0 {
-		return nil, certerr.DecodeError(certerr.ErrorSourceCertificate, errors.New("trailing data at end of certificate"))
+		return nil, certerr.DecodeError(
+			certerr.ErrorSourceCertificate,
+			errors.New("trailing data at end of certificate"),
+		)
 	}
 	return certs, nil
 }
@@ -278,29 +275,40 @@ func ParseCertificatesPEM(certsPEM []byte) ([]*x509.Certificate, error) {
 // either PKCS #7, PKCS #12, or raw x509.
 func ParseCertificatesDER(certsDER []byte, password string) (certs []*x509.Certificate, key crypto.Signer, err error) {
 	certsDER = bytes.TrimSpace(certsDER)
-	pkcs7data, err := pkcs7.ParsePKCS7(certsDER)
+
-	if err != nil {
+	// First, try PKCS #7
-		var pkcs12data interface{}
+	if pkcs7data, err7 := pkcs7.ParsePKCS7(certsDER); err7 == nil {
-		certs = make([]*x509.Certificate, 1)
-		pkcs12data, certs[0], err = pkcs12.Decode(certsDER, password)
-		if err != nil {
-			certs, err = x509.ParseCertificates(certsDER)
-			if err != nil {
-				return nil, nil, certerr.DecodeError(certerr.ErrorSourceCertificate, err)
-			}
-		} else {
-			key = pkcs12data.(crypto.Signer)
-		}
-	} else {
 		if pkcs7data.ContentInfo != "SignedData" {
-			return nil, nil, certerr.DecodeError(certerr.ErrorSourceCertificate, errors.New("can only extract certificates from signed data content info"))
+			return nil, nil, certerr.DecodeError(
+				certerr.ErrorSourceCertificate,
+				errors.New("can only extract certificates from signed data content info"),
+			)
 		}
 		certs = pkcs7data.Content.SignedData.Certificates
+		if certs == nil {
+			return nil, nil, certerr.DecodeError(certerr.ErrorSourceCertificate, errors.New("no certificates decoded"))
+		}
+		return certs, nil, nil
 	}
-	if certs == nil {
+
-		return nil, key, certerr.DecodeError(certerr.ErrorSourceCertificate, errors.New("no certificates decoded"))
+	// Next, try PKCS #12
+	if pkcs12data, cert, err12 := pkcs12.Decode(certsDER, password); err12 == nil {
+		signer, ok := pkcs12data.(crypto.Signer)
+		if !ok {
+			return nil, nil, certerr.DecodeError(
+				certerr.ErrorSourcePrivateKey,
+				errors.New("PKCS12 data does not contain a private key"),
+			)
+		}
+		return []*x509.Certificate{cert}, signer, nil
 	}
-	return certs, key, nil
+
+	// Finally, attempt to parse raw X.509 certificates
+	certs, err = x509.ParseCertificates(certsDER)
+	if err != nil {
+		return nil, nil, certerr.DecodeError(certerr.ErrorSourceCertificate, err)
+	}
+	return certs, nil, nil
 }
 
 // ParseSelfSignedCertificatePEM parses a PEM-encoded certificate and check if it is self-signed.
@@ -320,17 +328,26 @@ func ParseSelfSignedCertificatePEM(certPEM []byte) (*x509.Certificate, error) {
 // can handle PEM encoded PKCS #7 structures.
 func ParseCertificatePEM(certPEM []byte) (*x509.Certificate, error) {
 	certPEM = bytes.TrimSpace(certPEM)
-	cert, rest, err := ParseOneCertificateFromPEM(certPEM)
+	certs, rest, err := ParseOneCertificateFromPEM(certPEM)
 	if err != nil {
 		return nil, certerr.ParsingError(certerr.ErrorSourceCertificate, err)
-	} else if cert == nil {
-		return nil, certerr.DecodeError(certerr.ErrorSourceCertificate, errors.New("no certificate decoded"))
-	} else if len(rest) > 0 {
-		return nil, certerr.ParsingError(certerr.ErrorSourceCertificate, errors.New("the PEM file should contain only one object"))
-	} else if len(cert) > 1 {
-		return nil, certerr.ParsingError(certerr.ErrorSourceCertificate, errors.New("the PKCS7 object in the PEM file should contain only one certificate"))
 	}
-	return cert[0], nil
+	if certs == nil {
+		return nil, certerr.DecodeError(certerr.ErrorSourceCertificate, errors.New("no certificate decoded"))
+	}
+	if len(rest) > 0 {
+		return nil, certerr.ParsingError(
+			certerr.ErrorSourceCertificate,
+			errors.New("the PEM file should contain only one object"),
+		)
+	}
+	if len(certs) > 1 {
+		return nil, certerr.ParsingError(
+			certerr.ErrorSourceCertificate,
+			errors.New("the PKCS7 object in the PEM file should contain only one certificate"),
+		)
+	}
+	return certs[0], nil
 }
 
 // ParseOneCertificateFromPEM attempts to parse one PEM encoded certificate object,
@@ -338,7 +355,6 @@ func ParseCertificatePEM(certPEM []byte) (*x509.Certificate, error) {
 // multiple certificates, from the top of certsPEM, which itself may
 // contain multiple PEM encoded certificate objects.
 func ParseOneCertificateFromPEM(certsPEM []byte) ([]*x509.Certificate, []byte, error) {
-
 	block, rest := pem.Decode(certsPEM)
 	if block == nil {
 		return nil, rest, nil
@@ -384,7 +400,7 @@ func PEMToCertPool(pemCerts []byte) (*x509.CertPool, error) {
 
 	certPool := x509.NewCertPool()
 	if !certPool.AppendCertsFromPEM(pemCerts) {
-		return nil, errors.New("failed to load cert pool")
+		return nil, certerr.LoadingError(certerr.ErrorSourceCertificate, errors.New("failed to load cert pool"))
 	}
 
 	return certPool, nil
@@ -441,7 +457,10 @@ func ParseCSR(in []byte) (csr *x509.CertificateRequest, rest []byte, err error)
 	p, rest := pem.Decode(in)
 	if p != nil {
 		if p.Type != "NEW CERTIFICATE REQUEST" && p.Type != "CERTIFICATE REQUEST" {
-			return nil, rest, certerr.ParsingError(certerr.ErrorSourceCSR, certerr.ErrInvalidPEMType(p.Type, "NEW CERTIFICATE REQUEST", "CERTIFICATE REQUEST"))
+			return nil, rest, certerr.ParsingError(
+				certerr.ErrorSourceCSR,
+				certerr.ErrInvalidPEMType(p.Type, "NEW CERTIFICATE REQUEST", "CERTIFICATE REQUEST"),
+			)
 		}
 
 		csr, err = x509.ParseCertificateRequest(p.Bytes)
@@ -450,12 +469,12 @@ func ParseCSR(in []byte) (csr *x509.CertificateRequest, rest []byte, err error)
 	}
 
 	if err != nil {
-		return nil, rest, err
+		return nil, rest, certerr.ParsingError(certerr.ErrorSourceCSR, err)
 	}
 
 	err = csr.CheckSignature()
 	if err != nil {
-		return nil, rest, err
+		return nil, rest, certerr.VerifyError(certerr.ErrorSourceCSR, err)
 	}
 
 	return csr, rest, nil
@@ -472,7 +491,7 @@ func ParseCSRPEM(csrPEM []byte) (*x509.CertificateRequest, error) {
 	csrObject, err := x509.ParseCertificateRequest(block.Bytes)
 
 	if err != nil {
-		return nil, err
+		return nil, certerr.ParsingError(certerr.ErrorSourceCSR, err)
 	}
 
 	return csrObject, nil
@@ -509,7 +528,7 @@ func SignerAlgo(priv crypto.Signer) x509.SignatureAlgorithm {
 	}
 }
 
-// LoadClientCertificate load key/certificate from pem files
+// LoadClientCertificate load key/certificate from pem files.
 func LoadClientCertificate(certFile string, keyFile string) (*tls.Certificate, error) {
 	if certFile != "" && keyFile != "" {
 		cert, err := tls.LoadX509KeyPair(certFile, keyFile)
@@ -521,7 +540,7 @@ func LoadClientCertificate(certFile string, keyFile string) (*tls.Certificate, e
 	return nil, nil
 }
 
-// CreateTLSConfig creates a tls.Config object from certs and roots
+// CreateTLSConfig creates a tls.Config object from certs and roots.
 func CreateTLSConfig(remoteCAs *x509.CertPool, cert *tls.Certificate) *tls.Config {
 	var certs []tls.Certificate
 	if cert != nil {
@@ -554,7 +573,10 @@ func DeserializeSCTList(serializedSCTList []byte) ([]ct.SignedCertificateTimesta
 		return nil, err
 	}
 	if len(rest) != 0 {
-		return nil, certerr.ParsingError(certerr.ErrorSourceSCTList, errors.New("serialized SCT list contained trailing garbage"))
+		return nil, certerr.ParsingError(
+			certerr.ErrorSourceSCTList,
+			errors.New("serialized SCT list contained trailing garbage"),
+		)
 	}
 
 	list := make([]ct.SignedCertificateTimestamp, len(sctList.SCTList))
@@ -565,7 +587,10 @@ func DeserializeSCTList(serializedSCTList []byte) ([]ct.SignedCertificateTimesta
 			return nil, err
 		}
 		if len(rest) != 0 {
-			return nil, certerr.ParsingError(certerr.ErrorSourceSCTList, errors.New("serialized SCT list contained trailing garbage"))
+			return nil, certerr.ParsingError(
+				certerr.ErrorSourceSCTList,
+				errors.New("serialized SCT list contained trailing garbage"),
+			)
 		}
 		list[i] = sct
 	}
@@ -611,20 +636,16 @@ func SCTListFromOCSPResponse(response *ocsp.Response) ([]ct.SignedCertificateTim
 // the subsequent file. If no prefix is provided, valFile is assumed to be a
 // file path.
 func ReadBytes(valFile string) ([]byte, error) {
-	switch splitVal := strings.SplitN(valFile, ":", 2); len(splitVal) {
+	prefix, rest, found := strings.Cut(valFile, ":")
-	case 1:
+	if !found {
 		return os.ReadFile(valFile)
-	case 2:
+	}
-		switch splitVal[0] {
+	switch prefix {
-		case "env":
+	case "env":
-			return []byte(os.Getenv(splitVal[1])), nil
+		return []byte(os.Getenv(rest)), nil
-		case "file":
+	case "file":
-			return os.ReadFile(splitVal[1])
+		return os.ReadFile(rest)
-		default:
-			return nil, fmt.Errorf("unknown prefix: %s", splitVal[0])
-		}
 	default:
-		return nil, fmt.Errorf("multiple prefixes: %s",
+		return nil, fmt.Errorf("unknown prefix: %s", prefix)
-			strings.Join(splitVal[:len(splitVal)-1], ", "))
 	}
 }

certlib/pkcs7/pkcs7.go

@@ -93,7 +93,7 @@ type signedData struct {
 	Version          int
 	DigestAlgorithms asn1.RawValue
 	ContentInfo      asn1.RawValue
-	Certificates     asn1.RawValue `asn1:"optional" asn1:"tag:0"`
+	Certificates     asn1.RawValue `asn1:"optional"`
 	Crls             asn1.RawValue `asn1:"optional"`
 	SignerInfos      asn1.RawValue
 }
@@ -158,63 +158,95 @@ type EncryptedContentInfo struct {
 	EncryptedContent           []byte `asn1:"tag:0,optional"`
 }
 
+func unmarshalInit(raw []byte) (init initPKCS7, err error) {
+	_, err = asn1.Unmarshal(raw, &init)
+	if err != nil {
+		return initPKCS7{}, certerr.ParsingError(certerr.ErrorSourceCertificate, err)
+	}
+	return init, nil
+}
+
+func populateData(msg *PKCS7, content asn1.RawValue) error {
+	msg.ContentInfo = "Data"
+	_, err := asn1.Unmarshal(content.Bytes, &msg.Content.Data)
+	if err != nil {
+		return certerr.ParsingError(certerr.ErrorSourceCertificate, err)
+	}
+	return nil
+}
+
+func populateSignedData(msg *PKCS7, contentBytes []byte) error {
+	msg.ContentInfo = "SignedData"
+	var sd signedData
+	if _, err := asn1.Unmarshal(contentBytes, &sd); err != nil {
+		return certerr.ParsingError(certerr.ErrorSourceCertificate, err)
+	}
+	if len(sd.Certificates.Bytes) != 0 {
+		certs, err := x509.ParseCertificates(sd.Certificates.Bytes)
+		if err != nil {
+			return certerr.ParsingError(certerr.ErrorSourceCertificate, err)
+		}
+		msg.Content.SignedData.Certificates = certs
+	}
+	if len(sd.Crls.Bytes) != 0 {
+		crl, err := x509.ParseRevocationList(sd.Crls.Bytes)
+		if err != nil {
+			return certerr.ParsingError(certerr.ErrorSourceCertificate, err)
+		}
+		msg.Content.SignedData.Crl = crl
+	}
+	msg.Content.SignedData.Version = sd.Version
+	msg.Content.SignedData.Raw = contentBytes
+	return nil
+}
+
+func populateEncryptedData(msg *PKCS7, contentBytes []byte) error {
+	msg.ContentInfo = "EncryptedData"
+	var ed EncryptedData
+	if _, err := asn1.Unmarshal(contentBytes, &ed); err != nil {
+		return certerr.ParsingError(certerr.ErrorSourceCertificate, err)
+	}
+	if ed.Version != 0 {
+		return certerr.ParsingError(
+			certerr.ErrorSourceCertificate,
+			errors.New("only PKCS #7 encryptedData version 0 is supported"),
+		)
+	}
+	msg.Content.EncryptedData = ed
+	return nil
+}
+
 // ParsePKCS7 attempts to parse the DER encoded bytes of a
 // PKCS7 structure.
 func ParsePKCS7(raw []byte) (msg *PKCS7, err error) {
-
+	pkcs7, err := unmarshalInit(raw)
-	var pkcs7 initPKCS7
-	_, err = asn1.Unmarshal(raw, &pkcs7)
 	if err != nil {
-		return nil, certerr.ParsingError(certerr.ErrorSourceCertificate, err)
+		return nil, err
 	}
 
 	msg = new(PKCS7)
 	msg.Raw = pkcs7.Raw
 	msg.ContentInfo = pkcs7.ContentType.String()
-	switch {
-	case msg.ContentInfo == ObjIDData:
-		msg.ContentInfo = "Data"
-		_, err = asn1.Unmarshal(pkcs7.Content.Bytes, &msg.Content.Data)
-		if err != nil {
-			return nil, certerr.ParsingError(certerr.ErrorSourceCertificate, err)
-		}
-	case msg.ContentInfo == ObjIDSignedData:
-		msg.ContentInfo = "SignedData"
-		var signedData signedData
-		_, err = asn1.Unmarshal(pkcs7.Content.Bytes, &signedData)
-		if err != nil {
-			return nil, certerr.ParsingError(certerr.ErrorSourceCertificate, err)
-		}
-		if len(signedData.Certificates.Bytes) != 0 {
-			msg.Content.SignedData.Certificates, err = x509.ParseCertificates(signedData.Certificates.Bytes)
-			if err != nil {
-				return nil, certerr.ParsingError(certerr.ErrorSourceCertificate, err)
-			}
-		}
-		if len(signedData.Crls.Bytes) != 0 {
-			msg.Content.SignedData.Crl, err = x509.ParseRevocationList(signedData.Crls.Bytes)
-			if err != nil {
-				return nil, certerr.ParsingError(certerr.ErrorSourceCertificate, err)
-			}
-		}
-		msg.Content.SignedData.Version = signedData.Version
-		msg.Content.SignedData.Raw = pkcs7.Content.Bytes
-	case msg.ContentInfo == ObjIDEncryptedData:
-		msg.ContentInfo = "EncryptedData"
-		var encryptedData EncryptedData
-		_, err = asn1.Unmarshal(pkcs7.Content.Bytes, &encryptedData)
-		if err != nil {
-			return nil, certerr.ParsingError(certerr.ErrorSourceCertificate, err)
-		}
-		if encryptedData.Version != 0 {
-			return nil, certerr.ParsingError(certerr.ErrorSourceCertificate, errors.New("only PKCS #7 encryptedData version 0 is supported"))
-		}
-		msg.Content.EncryptedData = encryptedData
 
+	switch msg.ContentInfo {
+	case ObjIDData:
+		if err := populateData(msg, pkcs7.Content); err != nil {
+			return nil, err
+		}
+	case ObjIDSignedData:
+		if err := populateSignedData(msg, pkcs7.Content.Bytes); err != nil {
+			return nil, err
+		}
+	case ObjIDEncryptedData:
+		if err := populateEncryptedData(msg, pkcs7.Content.Bytes); err != nil {
+			return nil, err
+		}
 	default:
-		return nil, certerr.ParsingError(certerr.ErrorSourceCertificate, errors.New("only PKCS# 7 content of type data, signed data or encrypted data can be parsed"))
+		return nil, certerr.ParsingError(
+			certerr.ErrorSourceCertificate,
+			errors.New("only PKCS# 7 content of type data, signed data or encrypted data can be parsed"),
+		)
 	}
 
 	return msg, nil
-
 }

certlib/revoke/revoke.go

@@ -89,7 +89,7 @@ func ldapURL(url string) bool {
 // - false, false: an error was encountered while checking revocations.
 // - false, true:  the certificate was checked successfully, and it is not revoked.
 // - true, true:   the certificate was checked successfully, and it is revoked.
-// - true, false:  failure to check revocation status causes verification to fail
+// - true, false:  failure to check revocation status causes verification to fail.
 func revCheck(cert *x509.Certificate) (revoked, ok bool, err error) {
 	for _, url := range cert.CRLDistributionPoints {
 		if ldapURL(url) {
@@ -154,7 +154,6 @@ func getIssuer(cert *x509.Certificate) *x509.Certificate {
 	}
 
 	return issuer
-
 }
 
 // check a cert against a specific CRL. Returns the same bool pair
@@ -222,11 +221,11 @@ func VerifyCertificateError(cert *x509.Certificate) (revoked, ok bool, err error
 	if !time.Now().Before(cert.NotAfter) {
 		msg := fmt.Sprintf("Certificate expired %s\n", cert.NotAfter)
 		log.Info(msg)
-		return true, true, fmt.Errorf(msg)
+		return true, true, errors.New(msg)
 	} else if !time.Now().After(cert.NotBefore) {
 		msg := fmt.Sprintf("Certificate isn't valid until %s\n", cert.NotBefore)
 		log.Info(msg)
-		return true, true, fmt.Errorf(msg)
+		return true, true, errors.New(msg)
 	}
 	return revCheck(cert)
 }
@@ -343,21 +342,21 @@ func sendOCSPRequest(server string, req []byte, leaf, issuer *x509.Certificate)
 
 var crlRead = io.ReadAll
 
-// SetCRLFetcher sets the function to use to read from the http response body
+// SetCRLFetcher sets the function to use to read from the http response body.
 func SetCRLFetcher(fn func(io.Reader) ([]byte, error)) {
 	crlRead = fn
 }
 
 var remoteRead = io.ReadAll
 
-// SetRemoteFetcher sets the function to use to read from the http response body
+// SetRemoteFetcher sets the function to use to read from the http response body.
 func SetRemoteFetcher(fn func(io.Reader) ([]byte, error)) {
 	remoteRead = fn
 }
 
 var ocspRead = io.ReadAll
 
-// SetOCSPFetcher sets the function to use to read from the http response body
+// SetOCSPFetcher sets the function to use to read from the http response body.
 func SetOCSPFetcher(fn func(io.Reader) ([]byte, error)) {
 	ocspRead = fn
 }

certlib/revoke/revoke_test.go

@@ -50,7 +50,7 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 // to indicate that this is the case.
 
 // 2014/05/22 14:18:17 Certificate expired 2014-04-04 14:14:20 +0000 UTC
-// 2014/05/22 14:18:17 Revoked certificate: misc/intermediate_ca/ActalisServerAuthenticationCA.crt
+// 2014/05/22 14:18:17 Revoked certificate: misc/intermediate_ca/ActalisServerAuthenticationCA.crt.
 var expiredCert = mustParse(`-----BEGIN CERTIFICATE-----
 MIIEXTCCA8agAwIBAgIEBycURTANBgkqhkiG9w0BAQUFADB1MQswCQYDVQQGEwJV
 UzEYMBYGA1UEChMPR1RFIENvcnBvcmF0aW9uMScwJQYDVQQLEx5HVEUgQ3liZXJU
@@ -80,7 +80,7 @@ sESPRwHkcMUNdAp37FLweUw=
 
 // 2014/05/22 14:18:31 Serial number match: intermediate is revoked.
 // 2014/05/22 14:18:31 certificate is revoked via CRL
-// 2014/05/22 14:18:31 Revoked certificate: misc/intermediate_ca/MobileArmorEnterpriseCA.crt
+// 2014/05/22 14:18:31 Revoked certificate: misc/intermediate_ca/MobileArmorEnterpriseCA.crt.
 var revokedCert = mustParse(`-----BEGIN CERTIFICATE-----
 MIIEEzCCAvugAwIBAgILBAAAAAABGMGjftYwDQYJKoZIhvcNAQEFBQAwcTEoMCYG
 A1UEAxMfR2xvYmFsU2lnbiBSb290U2lnbiBQYXJ0bmVycyBDQTEdMBsGA1UECxMU
@@ -106,7 +106,7 @@ Kz5vh+5tmytUPKA8hUgmLWe94lMb7Uqq2wgZKsqun5DAWleKu81w7wEcOrjiiB+x
 jeBHq7OnpWm+ccTOPCE6H4ZN4wWVS7biEBUdop/8HgXBPQHWAdjL
 -----END CERTIFICATE-----`)
 
-// A Comodo intermediate CA certificate with issuer url, CRL url and OCSP url
+// A Comodo intermediate CA certificate with issuer url, CRL url and OCSP url.
 var goodComodoCA = (`-----BEGIN CERTIFICATE-----
 MIIGCDCCA/CgAwIBAgIQKy5u6tl1NmwUim7bo3yMBzANBgkqhkiG9w0BAQwFADCB
 hTELMAkGA1UEBhMCR0IxGzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4G
@@ -182,7 +182,6 @@ func TestGood(t *testing.T) {
 	} else if revoked {
 		t.Fatalf("good certificate should not have been marked as revoked")
 	}
-
 }
 
 func TestLdap(t *testing.T) {
@@ -230,7 +229,6 @@ func TestBadCRLSet(t *testing.T) {
 		t.Fatalf("key emptystring should be deleted from CRLSet")
 	}
 	delete(CRLSet, "")
-
 }
 
 func TestCachedCRLSet(t *testing.T) {
@@ -241,13 +239,11 @@ func TestCachedCRLSet(t *testing.T) {
 }
 
 func TestRemoteFetchError(t *testing.T) {
-
 	badurl := ":"
 
 	if _, err := fetchRemote(badurl); err == nil {
 		t.Fatalf("fetching bad url should result in non-nil error")
 	}
-
 }
 
 func TestNoOCSPServers(t *testing.T) {

cmd/cert-bundler/prompt.txt

@@ -1,3 +1,6 @@
+This project is an exploration into the utility of Jetbrains' Junie
+to write smaller but tedious programs.
+
 Task: build a certificate bundling tool in cmd/cert-bundler. It
 creates archives of certificates chains.
 

cmd/cert-revcheck/main.go

@@ -4,6 +4,7 @@ import (
 	"crypto/tls"
 	"crypto/x509"
 	"flag"
+	"errors"
 	"fmt"
 	"io/ioutil"
 	"net"
@@ -109,7 +110,7 @@ func checkSite(hostport string) (string, error) {
 
 	state := conn.ConnectionState()
 	if len(state.PeerCertificates) == 0 {
-		return "UNKNOWN", fmt.Errorf("no peer certificates presented")
+		return "UNKNOWN", errors.New("no peer certificates presented")
 	}
 	return evaluateCert(state.PeerCertificates[0])
 }

cmd/kgz/main.go

@@ -1,74 +1,68 @@
 package main
 
 import (
-	"compress/flate"
+    "compress/flate"
-	"compress/gzip"
+    "compress/gzip"
-	"flag"
+    "flag"
-	"fmt"
+    "fmt"
-	"io"
+    "io"
-	"os"
+    "os"
-	"path/filepath"
+    "path/filepath"
-	"strings"
+    "strings"
-
-	"github.com/pkg/errors"
 )
 
 const gzipExt = ".gz"
 
 func compress(path, target string, level int) error {
-	sourceFile, err := os.Open(path)
+ sourceFile, err := os.Open(path)
-	if err != nil {
+ if err != nil {
-		return errors.Wrap(err, "opening file for read")
+     return fmt.Errorf("opening file for read: %w", err)
-	}
+ }
 	defer sourceFile.Close()
 
-	destFile, err := os.Create(target)
+ destFile, err := os.Create(target)
-	if err != nil {
+ if err != nil {
-		return errors.Wrap(err, "opening file for write")
+     return fmt.Errorf("opening file for write: %w", err)
-	}
+ }
 	defer destFile.Close()
 
-	gzipCompressor, err := gzip.NewWriterLevel(destFile, level)
+ gzipCompressor, err := gzip.NewWriterLevel(destFile, level)
-	if err != nil {
+ if err != nil {
-		return errors.Wrap(err, "invalid compression level")
+     return fmt.Errorf("invalid compression level: %w", err)
-	}
+ }
 	defer gzipCompressor.Close()
 
-	_, err = io.Copy(gzipCompressor, sourceFile)
+ _, err = io.Copy(gzipCompressor, sourceFile)
-	if err != nil {
+ if err != nil {
-		return errors.Wrap(err, "compressing file")
+     return fmt.Errorf("compressing file: %w", err)
-	}
+ }
-
-	if err != nil {
-		return errors.Wrap(err, "stat(2)ing destination file")
-	}
 
 	return nil
 }
 
 func uncompress(path, target string) error {
-	sourceFile, err := os.Open(path)
+ sourceFile, err := os.Open(path)
-	if err != nil {
+ if err != nil {
-		return errors.Wrap(err, "opening file for read")
+     return fmt.Errorf("opening file for read: %w", err)
-	}
+ }
 	defer sourceFile.Close()
 
-	gzipUncompressor, err := gzip.NewReader(sourceFile)
+ gzipUncompressor, err := gzip.NewReader(sourceFile)
-	if err != nil {
+ if err != nil {
-		return errors.Wrap(err, "reading gzip headers")
+     return fmt.Errorf("reading gzip headers: %w", err)
-	}
+ }
 	defer gzipUncompressor.Close()
 
-	destFile, err := os.Create(target)
+ destFile, err := os.Create(target)
-	if err != nil {
+ if err != nil {
-		return errors.Wrap(err, "opening file for write")
+     return fmt.Errorf("opening file for write: %w", err)
-	}
+ }
 	defer destFile.Close()
 
-	_, err = io.Copy(destFile, gzipUncompressor)
+ _, err = io.Copy(destFile, gzipUncompressor)
-	if err != nil {
+ if err != nil {
-		return errors.Wrap(err, "uncompressing file")
+     return fmt.Errorf("uncompressing file: %w", err)
-	}
+ }
 
 	return nil
 }
@@ -112,9 +106,9 @@ func pathForUncompressing(source, dest string) (string, error) {
 	}
 
 	source = filepath.Base(source)
-	if !strings.HasSuffix(source, gzipExt) {
+ if !strings.HasSuffix(source, gzipExt) {
-		return "", errors.Errorf("%s is a not gzip-compressed file", source)
+        return "", fmt.Errorf("%s is a not gzip-compressed file", source)
-	}
+    }
 	outFile := source[:len(source)-len(gzipExt)]
 	outFile = filepath.Join(dest, outFile)
 	return outFile, nil
@@ -126,9 +120,9 @@ func pathForCompressing(source, dest string) (string, error) {
 	}
 
 	source = filepath.Base(source)
-	if strings.HasSuffix(source, gzipExt) {
+ if strings.HasSuffix(source, gzipExt) {
-		return "", errors.Errorf("%s is a gzip-compressed file", source)
+        return "", fmt.Errorf("%s is a gzip-compressed file", source)
-	}
+    }
 
 	dest = filepath.Join(dest, source+gzipExt)
 	return dest, nil

config/config.go

@@ -11,7 +11,7 @@ package config
 import (
 	"bufio"
 	"fmt"
-	"log"
+	"maps"
 	"os"
 	"sort"
 	"strings"
@@ -33,14 +33,15 @@ func SetEnvPrefix(pfx string) {
 	prefix = pfx
 }
 
+const keyValueSplitLength = 2
+
 func addLine(line string) {
 	if strings.HasPrefix(line, "#") || line == "" {
 		return
 	}
 
-	lineParts := strings.SplitN(line, "=", 2)
+	lineParts := strings.SplitN(line, "=", keyValueSplitLength)
-	if len(lineParts) != 2 {
+	if len(lineParts) != keyValueSplitLength {
-		log.Print("skipping line: ", line)
 		return // silently ignore empty keys
 	}
 
@@ -49,7 +50,7 @@ func addLine(line string) {
 	vars[lineParts[0]] = lineParts[1]
 }
 
-// LoadFile scans the file at path for key=value pairs and adds them
+// LoadFile scans the file at 'path' for key=value pairs and adds them
 // to the configuration.
 func LoadFile(path string) error {
 	file, err := os.Open(path)
@@ -67,18 +68,16 @@ func LoadFile(path string) error {
 	return scanner.Err()
 }
 
-// LoadFileFor scans the ini file at path, loading the default section
+// LoadFileFor scans the ini file at 'path', loading the default section
-// and overriding any keys found under section. If strict is true, the
+// and overriding any keys found under 'section'. If strict is true, the
-// named section must exist (i.e. to catch typos in the section name).
+// named section must exist (i.e., to catch typos in the section name).
 func LoadFileFor(path, section string, strict bool) error {
 	cmap, err := iniconf.ParseFile(path)
 	if err != nil {
 		return err
 	}
 
-	for key, value := range cmap[iniconf.DefaultSection] {
+	maps.Copy(vars, cmap[iniconf.DefaultSection])
-		vars[key] = value
-	}
 
 	smap, ok := cmap[section]
 	if !ok {
@@ -88,9 +87,7 @@ func LoadFileFor(path, section string, strict bool) error {
 		return nil
 	}
 
-	for key, value := range smap {
+	maps.Copy(vars, smap)
-		vars[key] = value
-	}
 
 	return nil
 }
@@ -107,7 +104,7 @@ func Get(key string) string {
 
 // GetDefault retrieves a value from either a configuration file or
 // the environment. Note that value from a file will override
-// environment variables. If a value isn't found (e.g. Get returns an
+// environment variables. If a value isn't found (e.g., Get returns an
 // empty string), the default value will be used.
 func GetDefault(key, def string) string {
 	if v := Get(key); v != "" {
@@ -117,8 +114,7 @@ func GetDefault(key, def string) string {
 }
 
 // Require retrieves a value from either a configuration file or the
-// environment. If the key isn't present, it will call log.Fatal, printing
+// environment. If the key isn't present, it will panic.
-// the missing key.
 func Require(key string) string {
 	if v, ok := vars[key]; ok {
 		return v
@@ -131,7 +127,7 @@ func Require(key string) string {
 			envMessage = " (note: looked for the key " + prefix + key
 			envMessage += " in the local env)"
 		}
-		log.Fatalf("missing required configuration value %s%s", key, envMessage)
+		panic(fmt.Sprintf("missing required configuration value %s%s", key, envMessage))
 	}
 
 	return v
@@ -139,7 +135,8 @@ func Require(key string) string {
 
 // ListKeys returns a slice of the currently known keys.
 func ListKeys() []string {
-	keyList := []string{}
+	var keyList []string
+
 	for k := range vars {
 		keyList = append(keyList, k)
 	}

config/config_test.go

@@ -1,27 +1,26 @@
-package config
+package config_test
 
 import (
 	"os"
 	"testing"
+
+	"git.wntrmute.dev/kyle/goutils/config"
 )
 
 const (
 	testFilePath = "testdata/test.env"
 
-	// Keys
+	// Key constants.
 	kOrder   = "ORDER"
 	kSpecies = "SPECIES"
 	kName    = "COMMON_NAME"
 
-	// Env
 	eOrder   = "corvus"
 	eSpecies = "corvus corax"
 	eName    = "northern raven"
 
-	// File
 	fOrder   = "stringiformes"
 	fSpecies = "strix aluco"
-	// Name isn't set in the file to test fall through.
 )
 
 func init() {
@@ -31,8 +30,8 @@ func init() {
 }
 
 func TestLoadEnvOnly(t *testing.T) {
-	order := Get(kOrder)
+	order := config.Get(kOrder)
-	species := Get(kSpecies)
+	species := config.Get(kSpecies)
 	if order != eOrder {
 		t.Errorf("want %s, have %s", eOrder, order)
 	}
@@ -43,14 +42,14 @@ func TestLoadEnvOnly(t *testing.T) {
 }
 
 func TestLoadFile(t *testing.T) {
-	err := LoadFile(testFilePath)
+	err := config.LoadFile(testFilePath)
 	if err != nil {
 		t.Fatal(err)
 	}
 
-	order := Get(kOrder)
+	order := config.Get(kOrder)
-	species := Get(kSpecies)
+	species := config.Get(kSpecies)
-	name := Get(kName)
+	name := config.Get(kName)
 
 	if order != fOrder {
 		t.Errorf("want %s, have %s", fOrder, order)

config/iniconf/iniconf.go

@@ -2,6 +2,7 @@ package iniconf
 
 import (
 	"bufio"
+	"errors"
 	"fmt"
 	"io"
 	"os"
@@ -23,30 +24,31 @@ var (
 var DefaultSection = "default"
 
 // ParseFile attempts to load the named config file.
-func ParseFile(fileName string) (cfg ConfigMap, err error) {
+func ParseFile(fileName string) (ConfigMap, error) {
-	var file *os.File
+	file, err := os.Open(fileName)
-	file, err = os.Open(fileName)
 	if err != nil {
-		return
+		return nil, err
 	}
 	defer file.Close()
+
 	return ParseReader(file)
 }
 
 // ParseReader reads a configuration from an io.Reader.
-func ParseReader(r io.Reader) (cfg ConfigMap, err error) {
+func ParseReader(r io.Reader) (ConfigMap, error) {
-	cfg = ConfigMap{}
+	cfg := ConfigMap{}
 	buf := bufio.NewReader(r)
 
 	var (
 		line           string
 		longLine       bool
 		currentSection string
+		err            error
 	)
 
 	for {
 		line, longLine, err = readConfigLine(buf, line, longLine)
-		if err == io.EOF {
+		if errors.Is(err, io.EOF) {
 			err = nil
 			break
 		} else if err != nil {
@@ -62,11 +64,12 @@ func ParseReader(r io.Reader) (cfg ConfigMap, err error) {
 			break
 		}
 	}
-	return
+
+	return cfg, err
 }
 
 // readConfigLine reads and assembles a complete configuration line, handling long lines.
-func readConfigLine(buf *bufio.Reader, currentLine string, longLine bool) (line string, stillLong bool, err error) {
+func readConfigLine(buf *bufio.Reader, currentLine string, longLine bool) (string, bool, error) {
 	lineBytes, isPrefix, err := buf.ReadLine()
 	if err != nil {
 		return "", false, err
@@ -94,14 +97,14 @@ func processConfigLine(cfg ConfigMap, line string, currentSection string) (strin
 		return handleConfigLine(cfg, line, currentSection)
 	}
 
-	return currentSection, fmt.Errorf("invalid config file")
+	return currentSection, errors.New("invalid config file")
 }
 
 // handleSectionLine processes a section header line.
 func handleSectionLine(cfg ConfigMap, line string) (string, error) {
 	section := configSection.ReplaceAllString(line, "$1")
 	if section == "" {
-		return "", fmt.Errorf("invalid structure in file")
+		return "", errors.New("invalid structure in file")
 	}
 	if !cfg.SectionInConfig(section) {
 		cfg[section] = make(map[string]string, 0)
@@ -139,41 +142,39 @@ func (c ConfigMap) SectionInConfig(section string) bool {
 }
 
 // ListSections returns the list of sections in the config map.
-func (c ConfigMap) ListSections() (sections []string) {
+func (c ConfigMap) ListSections() []string {
+	sections := make([]string, 0, len(c))
 	for section := range c {
 		sections = append(sections, section)
 	}
-	return
+	return sections
 }
 
 // WriteFile writes out the configuration to a file.
-func (c ConfigMap) WriteFile(filename string) (err error) {
+func (c ConfigMap) WriteFile(filename string) error {
 	file, err := os.Create(filename)
 	if err != nil {
-		return
+		return err
 	}
 	defer file.Close()
 
 	for _, section := range c.ListSections() {
 		sName := fmt.Sprintf("[ %s ]\n", section)
-		_, err = file.Write([]byte(sName))
+		if _, err = file.WriteString(sName); err != nil {
-		if err != nil {
+			return err
-			return
 		}
 
 		for k, v := range c[section] {
 			line := fmt.Sprintf("%s = %s\n", k, v)
-			_, err = file.Write([]byte(line))
+			if _, err = file.WriteString(line); err != nil {
-			if err != nil {
+				return err
-				return
 			}
 		}
-		_, err = file.Write([]byte{0x0a})
+		if _, err = file.Write([]byte{0x0a}); err != nil {
-		if err != nil {
+			return err
-			return
 		}
 	}
-	return
+	return nil
 }
 
 // AddSection creates a new section in the config map.
@@ -197,27 +198,26 @@ func (c ConfigMap) AddKeyVal(section, key, val string) {
 }
 
 // GetValue retrieves the value from a key map.
-func (c ConfigMap) GetValue(section, key string) (val string, present bool) {
+func (c ConfigMap) GetValue(section, key string) (string, bool) {
 	if c == nil {
-		return
+		return "", false
 	}
 
 	if section == "" {
 		section = DefaultSection
 	}
 
-	_, ok := c[section]
+	if _, ok := c[section]; !ok {
-	if !ok {
+		return "", false
-		return
 	}
 
-	val, present = c[section][key]
+	val, present := c[section][key]
-	return
+	return val, present
 }
 
 // GetValueDefault retrieves the value from a key map if present,
 // otherwise the default value.
-func (c ConfigMap) GetValueDefault(section, key, value string) (val string) {
+func (c ConfigMap) GetValueDefault(section, key, value string) string {
 	kval, ok := c.GetValue(section, key)
 	if !ok {
 		return value
@@ -226,7 +226,7 @@ func (c ConfigMap) GetValueDefault(section, key, value string) (val string) {
 }
 
 // SectionKeys returns the sections in the config map.
-func (c ConfigMap) SectionKeys(section string) (keys []string, present bool) {
+func (c ConfigMap) SectionKeys(section string) ([]string, bool) {
 	if c == nil {
 		return nil, false
 	}
@@ -235,13 +235,12 @@ func (c ConfigMap) SectionKeys(section string) (keys []string, present bool) {
 		section = DefaultSection
 	}
 
-	cm := c
+	s, ok := c[section]
-	s, ok := cm[section]
 	if !ok {
 		return nil, false
 	}
 
-	keys = make([]string, 0, len(s))
+	keys := make([]string, 0, len(s))
 	for key := range s {
 		keys = append(keys, key)
 	}

config/iniconf/iniconf_test.go

@@ -1,18 +1,19 @@
-package iniconf
+package iniconf_test
 
 import (
 	"errors"
-	"fmt"
 	"os"
 	"sort"
 	"testing"
+
+	"git.wntrmute.dev/kyle/goutils/config/iniconf"
 )
 
 // FailWithError is a utility for dumping errors and failing the test.
 func FailWithError(t *testing.T, err error) {
-	fmt.Println("failed")
+	t.Log("failed")
 	if err != nil {
-		fmt.Println("[!] ", err.Error())
+		t.Log("[!] ", err.Error())
 	}
 	t.FailNow()
 }
@@ -49,47 +50,50 @@ func stringSlicesEqual(slice1, slice2 []string) bool {
 
 func TestGoodConfig(t *testing.T) {
 	testFile := "testdata/test.conf"
-	fmt.Printf("[+] validating known-good config... ")
+	t.Logf("[+] validating known-good config... ")
-	cmap, err := ParseFile(testFile)
+	cmap, err := iniconf.ParseFile(testFile)
 	if err != nil {
 		FailWithError(t, err)
 	} else if len(cmap) != 2 {
 		FailWithError(t, err)
 	}
-	fmt.Println("ok")
+	t.Log("ok")
 }
 
 func TestGoodConfig2(t *testing.T) {
 	testFile := "testdata/test2.conf"
-	fmt.Printf("[+] validating second known-good config... ")
+	t.Logf("[+] validating second known-good config... ")
-	cmap, err := ParseFile(testFile)
+	cmap, err := iniconf.ParseFile(testFile)
-	if err != nil {
+	switch {
+	case err != nil:
 		FailWithError(t, err)
-	} else if len(cmap) != 1 {
+	case len(cmap) != 1:
 		FailWithError(t, err)
-	} else if len(cmap["default"]) != 3 {
+	case len(cmap["default"]) != 3:
 		FailWithError(t, err)
+	default:
+		// nothing to do here
 	}
-	fmt.Println("ok")
+	t.Log("ok")
 }
 
 func TestBadConfig(t *testing.T) {
 	testFile := "testdata/bad.conf"
-	fmt.Printf("[+] ensure invalid config file fails... ")
+	t.Logf("[+] ensure invalid config file fails... ")
-	_, err := ParseFile(testFile)
+	_, err := iniconf.ParseFile(testFile)
 	if err == nil {
-		err = fmt.Errorf("invalid config file should fail")
+		err = errors.New("invalid config file should fail")
 		FailWithError(t, err)
 	}
-	fmt.Println("ok")
+	t.Log("ok")
 }
 
 func TestWriteConfigFile(t *testing.T) {
-	fmt.Printf("[+] ensure config file is written properly... ")
+	t.Logf("[+] ensure config file is written properly... ")
 	const testFile = "testdata/test.conf"
 	const testOut = "testdata/test.out"
 
-	cmap, err := ParseFile(testFile)
+	cmap, err := iniconf.ParseFile(testFile)
 	if err != nil {
 		FailWithError(t, err)
 	}
@@ -100,7 +104,7 @@ func TestWriteConfigFile(t *testing.T) {
 		FailWithError(t, err)
 	}
 
-	cmap2, err := ParseFile(testOut)
+	cmap2, err := iniconf.ParseFile(testOut)
 	if err != nil {
 		FailWithError(t, err)
 	}
@@ -110,25 +114,25 @@ func TestWriteConfigFile(t *testing.T) {
 	sort.Strings(sectionList1)
 	sort.Strings(sectionList2)
 	if !stringSlicesEqual(sectionList1, sectionList2) {
-		err = fmt.Errorf("section lists don't match")
+		err = errors.New("section lists don't match")
 		FailWithError(t, err)
 	}
 
 	for _, section := range sectionList1 {
 		for _, k := range cmap[section] {
 			if cmap[section][k] != cmap2[section][k] {
-				err = fmt.Errorf("config key doesn't match")
+				err = errors.New("config key doesn't match")
 				FailWithError(t, err)
 			}
 		}
 	}
-	fmt.Println("ok")
+	t.Log("ok")
 }
 
 func TestQuotedValue(t *testing.T) {
 	testFile := "testdata/test.conf"
-	fmt.Printf("[+] validating quoted value... ")
+	t.Logf("[+] validating quoted value... ")
-	cmap, _ := ParseFile(testFile)
+	cmap, _ := iniconf.ParseFile(testFile)
 	val := cmap["sectionName"]["key4"]
 	if val != " space at beginning and end " {
 		FailWithError(t, errors.New("Wrong value in double quotes ["+val+"]"))
@@ -138,5 +142,5 @@ func TestQuotedValue(t *testing.T) {
 	if val != " is quoted with single quotes " {
 		FailWithError(t, errors.New("Wrong value in single quotes ["+val+"]"))
 	}
-	fmt.Println("ok")
+	t.Log("ok")
 }

config/path.go

@@ -1,5 +1,4 @@
 //go:build !linux
-// +build !linux
 
 package config
 

config/path_test.go

@@ -1,7 +1,11 @@
-package config
+package config_test
 
-import "testing"
+import (
+	"testing"
+
+	"git.wntrmute.dev/kyle/goutils/config"
+)
 
 func TestDefaultPath(t *testing.T) {
-	t.Log(DefaultConfigPath("demoapp", "app.conf"))
+	t.Log(config.DefaultConfigPath("demoapp", "app.conf"))
 }

dbg/dbg.go

@@ -47,7 +47,7 @@ func ToFile(path string) (*DebugPrinter, error) {
 	}, nil
 }
 
-// To sets up a new DebugPrint to an io.WriteCloser.
+// To will set up a new DebugPrint to an io.WriteCloser.
 func To(w io.WriteCloser) *DebugPrinter {
 	return &DebugPrinter{
 		out: w,
@@ -55,21 +55,21 @@ func To(w io.WriteCloser) *DebugPrinter {
 }
 
 // Print calls fmt.Print if Enabled is true.
-func (dbg *DebugPrinter) Print(v ...interface{}) {
+func (dbg *DebugPrinter) Print(v ...any) {
 	if dbg.Enabled {
 		fmt.Fprint(dbg.out, v...)
 	}
 }
 
 // Println calls fmt.Println if Enabled is true.
-func (dbg *DebugPrinter) Println(v ...interface{}) {
+func (dbg *DebugPrinter) Println(v ...any) {
 	if dbg.Enabled {
 		fmt.Fprintln(dbg.out, v...)
 	}
 }
 
 // Printf calls fmt.Printf if Enabled is true.
-func (dbg *DebugPrinter) Printf(format string, v ...interface{}) {
+func (dbg *DebugPrinter) Printf(format string, v ...any) {
 	if dbg.Enabled {
 		fmt.Fprintf(dbg.out, format, v...)
 	}

dbg/dbg_test.go

@@ -2,7 +2,6 @@ package dbg
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 	"testing"
 
@@ -50,7 +49,7 @@ func TestTo(t *testing.T) {
 }
 
 func TestToFile(t *testing.T) {
-	testFile, err := ioutil.TempFile("", "dbg")
+	testFile, err := os.CreateTemp(t.TempDir(), "dbg")
 	assert.NoErrorT(t, err)
 	err = testFile.Close()
 	assert.NoErrorT(t, err)
@@ -103,7 +102,7 @@ func TestWriting(t *testing.T) {
 }
 
 func TestToFileError(t *testing.T) {
-	testFile, err := ioutil.TempFile("", "dbg")
+	testFile, err := os.CreateTemp(t.TempDir(), "dbg")
 	assert.NoErrorT(t, err)
 	err = testFile.Chmod(0400)
 	assert.NoErrorT(t, err)

die/README.md

@@ -1,12 +0,0 @@
-Simple fatal utilities for Go programs.
-
-```
-	result, err := doSomething()
-	die.If(err)
-
-	ok := processResult(result)
-	if !ok {
-		die.With("failed to process result %s", result.Name)
-	}
-```
-

die/die.go

@@ -1,4 +1,5 @@
-// Package die contains utilities for fatal error handling.
+// Package die contains utilities for fatal error handling. It
+// presents simple fatal utilities for Go programs.
 package die
 
 import (
@@ -15,14 +16,14 @@ func If(err error) {
 }
 
 // With prints the message to stderr, appending a newline, and exits.
-func With(fstr string, args ...interface{}) {
+func With(fstr string, args ...any) {
 	out := fmt.Sprintf("[!] %s\n", fstr)
 	fmt.Fprintf(os.Stderr, out, args...)
 	os.Exit(1)
 }
 
 // When prints the error to stderr and exits if cond is true.
-func When(cond bool, fstr string, args ...interface{}) {
+func When(cond bool, fstr string, args ...any) {
 	if cond {
 		With(fstr, args...)
 	}

fileutil/fileutil.go

@@ -1,10 +1,10 @@
 //go:build !windows
-// +build !windows
 
 // Package fileutil contains common file functions.
 package fileutil
 
 import (
+	"math"
 	"os"
 
 	"golang.org/x/sys/unix"
@@ -46,5 +46,9 @@ const (
 // Access returns a boolean indicating whether the mode being checked
 // for is valid.
 func Access(path string, mode int) error {
-	return unix.Access(path, uint32(mode))
+	// Validate the conversion to avoid potential integer overflow (gosec G115).
+	if mode < 0 || uint64(mode) > uint64(math.MaxUint32) {
+		return unix.EINVAL
+	}
+	return unix.Access(path, uint32(mode)) // #nosec G115 - handled above.
 }

fileutil/fileutil_windows.go

@@ -1,5 +1,4 @@
 //go:build windows
-// +build windows
 
 // Package fileutil contains common file functions.
 package fileutil

go.mod

@@ -1,14 +1,13 @@
 module git.wntrmute.dev/kyle/goutils
 
-go 1.22
+go 1.24.0
 
 require (
 	github.com/hashicorp/go-syslog v1.0.0
 	github.com/kr/text v0.2.0
-	github.com/pkg/errors v0.9.1
 	github.com/pkg/sftp v1.12.0
-	golang.org/x/crypto v0.0.0-20220314234659-1baeb1ce4c0b
+	golang.org/x/crypto v0.44.0
-	golang.org/x/sys v0.0.0-20220412211240-33da011f77ad
+	golang.org/x/sys v0.38.0
 	gopkg.in/yaml.v2 v2.4.0
 )
 
@@ -20,5 +19,6 @@ require (
 require (
 	github.com/kr/fs v0.1.0 // indirect
 	github.com/kr/pretty v0.1.0 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
 	gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 // indirect
 )

go.sum

@@ -25,14 +25,15 @@ github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd
 github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20200820211705-5c72a883971a/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
-golang.org/x/crypto v0.0.0-20220314234659-1baeb1ce4c0b h1:Qwe1rC8PSniVfAFPFJeyUkB+zcysC3RgJBAGk7eqBEU=
+golang.org/x/crypto v0.44.0 h1:A97SsFvM3AIwEEmTBiaxPPTYpDC47w720rdiiUvgoAU=
-golang.org/x/crypto v0.0.0-20220314234659-1baeb1ce4c0b/go.mod h1:IxCIyHEi3zRg3s0A5j5BB6A9Jmi73HwBIUl50j+osU4=
+golang.org/x/crypto v0.44.0/go.mod h1:013i+Nw79BMiQiMsOPcVCB5ZIJbYkerPrGnOa00tvmc=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20220412211240-33da011f77ad h1:ntjMns5wyP/fN65tdBD4g8J5w8n015+iIIs9rtjXkY0=
+golang.org/x/sys v0.38.0 h1:3yZWxaJjBmCWXqhN1qh02AkOnCQ1poK6oF+a7xWL6Gc=
-golang.org/x/sys v0.0.0-20220412211240-33da011f77ad/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.38.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
-golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1 h1:v+OssWQX+hTHEmOBgwxdZxK4zHq3yOs8F9J7mk0PY8E=
+golang.org/x/term v0.37.0 h1:8EGAD0qCmHYZg6J17DvsMy9/wJ7/D/4pV/wfnld5lTU=
+golang.org/x/term v0.37.0/go.mod h1:5pB4lxRNYYVZuTLmy8oR2BH8dflOR+IbTYFD8fi3254=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=

lib/lib.go

@@ -11,7 +11,7 @@ import (
 var progname = filepath.Base(os.Args[0])
 
 // ProgName returns what lib thinks the program name is, namely the
-// basename of of argv0.
+// basename of argv0.
 //
 // It is similar to the Linux __progname function.
 func ProgName() string {

log/logger.go

@@ -1,4 +1,4 @@
-// Package syslog is a syslog-type facility for logging.
+// Package log is a syslog-type facility for logging.
 package log
 
 import (
@@ -17,7 +17,7 @@ type logger struct {
 	writeConsole bool
 }
 
-func (log *logger) printf(p gsyslog.Priority, format string, args ...interface{}) {
+func (log *logger) printf(p gsyslog.Priority, format string, args ...any) {
 	if !strings.HasSuffix(format, "\n") {
 		format += "\n"
 	}
@@ -28,33 +28,33 @@ func (log *logger) printf(p gsyslog.Priority, format string, args ...interface{}
 	}
 
 	if log.l != nil {
-		log.l.WriteLevel(p, []byte(fmt.Sprintf(format, args...)))
+		_ = log.l.WriteLevel(p, fmt.Appendf(nil, format, args...))
 	}
 }
 
-func (log *logger) print(p gsyslog.Priority, args ...interface{}) {
+func (log *logger) print(p gsyslog.Priority, args ...any) {
 	if p <= log.p && log.writeConsole {
 		fmt.Printf("%s [%s] ", prioritiev[p], timestamp())
 		fmt.Print(args...)
 	}
 
 	if log.l != nil {
-		log.l.WriteLevel(p, []byte(fmt.Sprint(args...)))
+		_ = log.l.WriteLevel(p, fmt.Append(nil, args...))
 	}
 }
 
-func (log *logger) println(p gsyslog.Priority, args ...interface{}) {
+func (log *logger) println(p gsyslog.Priority, args ...any) {
 	if p <= log.p && log.writeConsole {
 		fmt.Printf("%s [%s] ", prioritiev[p], timestamp())
 		fmt.Println(args...)
 	}
 
 	if log.l != nil {
-		log.l.WriteLevel(p, []byte(fmt.Sprintln(args...)))
+		_ = log.l.WriteLevel(p, fmt.Appendln(nil, args...))
 	}
 }
 
-func (log *logger) spew(args ...interface{}) {
+func (log *logger) spew(args ...any) {
 	if log.p == gsyslog.LOG_DEBUG {
 		spew.Dump(args...)
 	}
@@ -160,109 +160,109 @@ func Setup(opts *Options) error {
 	return nil
 }
 
-func Debug(args ...interface{}) {
+func Debug(args ...any) {
 	log.print(gsyslog.LOG_DEBUG, args...)
 }
 
-func Info(args ...interface{}) {
+func Info(args ...any) {
 	log.print(gsyslog.LOG_INFO, args...)
 }
 
-func Notice(args ...interface{}) {
+func Notice(args ...any) {
 	log.print(gsyslog.LOG_NOTICE, args...)
 }
 
-func Warning(args ...interface{}) {
+func Warning(args ...any) {
 	log.print(gsyslog.LOG_WARNING, args...)
 }
 
-func Err(args ...interface{}) {
+func Err(args ...any) {
 	log.print(gsyslog.LOG_ERR, args...)
 }
 
-func Crit(args ...interface{}) {
+func Crit(args ...any) {
 	log.print(gsyslog.LOG_CRIT, args...)
 }
 
-func Alert(args ...interface{}) {
+func Alert(args ...any) {
 	log.print(gsyslog.LOG_ALERT, args...)
 }
 
-func Emerg(args ...interface{}) {
+func Emerg(args ...any) {
 	log.print(gsyslog.LOG_EMERG, args...)
 }
 
-func Debugln(args ...interface{}) {
+func Debugln(args ...any) {
 	log.println(gsyslog.LOG_DEBUG, args...)
 }
 
-func Infoln(args ...interface{}) {
+func Infoln(args ...any) {
 	log.println(gsyslog.LOG_INFO, args...)
 }
 
-func Noticeln(args ...interface{}) {
+func Noticeln(args ...any) {
 	log.println(gsyslog.LOG_NOTICE, args...)
 }
 
-func Warningln(args ...interface{}) {
+func Warningln(args ...any) {
 	log.print(gsyslog.LOG_WARNING, args...)
 }
 
-func Errln(args ...interface{}) {
+func Errln(args ...any) {
 	log.println(gsyslog.LOG_ERR, args...)
 }
 
-func Critln(args ...interface{}) {
+func Critln(args ...any) {
 	log.println(gsyslog.LOG_CRIT, args...)
 }
 
-func Alertln(args ...interface{}) {
+func Alertln(args ...any) {
 	log.println(gsyslog.LOG_ALERT, args...)
 }
 
-func Emergln(args ...interface{}) {
+func Emergln(args ...any) {
 	log.println(gsyslog.LOG_EMERG, args...)
 }
 
-func Debugf(format string, args ...interface{}) {
+func Debugf(format string, args ...any) {
 	log.printf(gsyslog.LOG_DEBUG, format, args...)
 }
 
-func Infof(format string, args ...interface{}) {
+func Infof(format string, args ...any) {
 	log.printf(gsyslog.LOG_INFO, format, args...)
 }
 
-func Noticef(format string, args ...interface{}) {
+func Noticef(format string, args ...any) {
 	log.printf(gsyslog.LOG_NOTICE, format, args...)
 }
 
-func Warningf(format string, args ...interface{}) {
+func Warningf(format string, args ...any) {
 	log.printf(gsyslog.LOG_WARNING, format, args...)
 }
 
-func Errf(format string, args ...interface{}) {
+func Errf(format string, args ...any) {
 	log.printf(gsyslog.LOG_ERR, format, args...)
 }
 
-func Critf(format string, args ...interface{}) {
+func Critf(format string, args ...any) {
 	log.printf(gsyslog.LOG_CRIT, format, args...)
 }
 
-func Alertf(format string, args ...interface{}) {
+func Alertf(format string, args ...any) {
 	log.printf(gsyslog.LOG_ALERT, format, args...)
 }
 
-func Emergf(format string, args ...interface{}) {
+func Emergf(format string, args ...any) {
 	log.printf(gsyslog.LOG_EMERG, format, args...)
 	os.Exit(1)
 }
 
-func Fatal(args ...interface{}) {
+func Fatal(args ...any) {
 	log.println(gsyslog.LOG_ERR, args...)
 	os.Exit(1)
 }
 
-func Fatalf(format string, args ...interface{}) {
+func Fatalf(format string, args ...any) {
 	log.printf(gsyslog.LOG_ERR, format, args...)
 	os.Exit(1)
 }
@@ -279,7 +279,7 @@ func FatalError(err error, message string) {
 }
 
 // Spew will pretty print the args if the logger is set to DEBUG priority.
-func Spew(args ...interface{}) {
+func Spew(args ...any) {
 	log.spew(args...)
 }
 

logging/doc.go

@@ -2,14 +2,13 @@
 // consist of timestamps, an actor and event string, and a mapping of
 // string key-value attribute pairs. For example,
 //
-//   log.Error("serialiser", "failed to open file",
+//	log.Error("serialiser", "failed to open file",
-//             map[string]string{
+//	          map[string]string{
-//                     "error": err.Error(),
+//	                  "error": err.Error(),
-//                     "path": "data.bin",
+//	                  "path": "data.bin",
-//             })
+//	          })
 //
 // This produces the output message
 //
-//   [2016-04-01T15:04:30-0700] [ERROR] [actor:serialiser event:failed to open file] error=is a directory path=data.bin
+//	[2016-04-01T15:04:30-0700] [ERROR] [actor:serialiser event:failed to open file] error=is a directory path=data.bin
-//
 package logging

logging/example/example.go

@@ -25,8 +25,8 @@ func main() {
 
 	log.Info("example", "filelog test", nil)
 	exampleNewFromFile()
-	os.Remove("example.log")
+	_ = os.Remove("example.log")
-	os.Remove("example.err")
+	_ = os.Remove("example.err")
 }
 
 func exampleNewFromFile() {

logging/example_test.go

@@ -23,7 +23,7 @@ func Example() {
 		map[string]string{"when": time.Now().String()})
 }
 
-func ExampleNewFromFile() {
+func ExampleNewSplitFile() {
 	flog, err := logging.NewSplitFile("example.log", "example.err", true)
 	if err != nil {
 		log.Fatal("filelog", "failed to open logger",

logging/file.go

@@ -1,6 +1,9 @@
 package logging
 
-import "os"
+import (
+    "fmt"
+    "os"
+)
 
 // File writes its logs to file.
 type File struct {
@@ -8,22 +11,6 @@ type File struct {
 	*LogWriter
 }
 
-// Close calls close on the underlying log files.
-func (fl *File) Close() error {
-	if fl.fo != nil {
-		if err := fl.fo.Close(); err != nil {
-			return err
-		}
-		fl.fo = nil
-	}
-
-	if fl.fe != nil {
-		return fl.fe.Close()
-	}
-
-	return nil
-}
-
 // NewFile creates a new Logger that writes all logs to the file
 // specified by path. If overwrite is specified, the log file will be
 // truncated before writing. Otherwise, the log file will be appended
@@ -36,7 +23,7 @@ func NewFile(path string, overwrite bool) (*File, error) {
 	if overwrite {
 		fl.fo, err = os.Create(path)
 	} else {
-		fl.fo, err = os.OpenFile(path, os.O_WRONLY|os.O_APPEND, 0644)
+		fl.fo, err = os.OpenFile(path, os.O_WRONLY|os.O_APPEND, 0600) // #nosec G302
 	}
 
 	if err != nil {
@@ -59,7 +46,7 @@ func NewSplitFile(outpath, errpath string, overwrite bool) (*File, error) {
 	if overwrite {
 		fl.fo, err = os.Create(outpath)
 	} else {
-		fl.fo, err = os.OpenFile(outpath, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0644)
+		fl.fo, err = os.OpenFile(outpath, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0600)
 	}
 
 	if err != nil {
@@ -69,14 +56,51 @@ func NewSplitFile(outpath, errpath string, overwrite bool) (*File, error) {
 	if overwrite {
 		fl.fe, err = os.Create(errpath)
 	} else {
-		fl.fe, err = os.OpenFile(errpath, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0644)
+		fl.fe, err = os.OpenFile(errpath, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0600)
 	}
 
-	if err != nil {
+ if err != nil {
-		fl.Close()
+        if closeErr := fl.Close(); closeErr != nil {
-		return nil, err
+            return nil, fmt.Errorf("failed to open error log: cleanup close failed: %v: %w", closeErr, err)
-	}
+        }
+        return nil, err
+    }
 
 	fl.LogWriter = NewLogWriter(fl.fo, fl.fe)
 	return fl, nil
 }
+
+// Close calls close on the underlying log files.
+func (fl *File) Close() error {
+	if fl.fo != nil {
+		if err := fl.fo.Close(); err != nil {
+			return err
+		}
+		fl.fo = nil
+	}
+
+	if fl.fe != nil {
+		return fl.fe.Close()
+	}
+
+	return nil
+}
+
+func (fl *File) Flush() error {
+	if err := fl.fo.Sync(); err != nil {
+		return err
+	}
+	return fl.fe.Sync()
+}
+
+func (fl *File) Chmod(mode os.FileMode) error {
+    if err := fl.fo.Chmod(mode); err != nil {
+        return fmt.Errorf("failed to chmod output log: %w", err)
+    }
+
+    if err := fl.fe.Chmod(mode); err != nil {
+        return fmt.Errorf("failed to chmod error log: %w", err)
+    }
+
+    return nil
+}

logging/levels.go

@@ -32,31 +32,6 @@ const (
 // DefaultLevel is the default logging level when none is provided.
 const DefaultLevel = LevelInfo
 
-// Cheap integer to fixed-width decimal ASCII.  Give a negative width
-// to avoid zero-padding. (From log/log.go in the standard library).
-func itoa(i int, wid int) string {
-	// Assemble decimal in reverse order.
-	var b [20]byte
-	bp := len(b) - 1
-	for i >= 10 || wid > 1 {
-		wid--
-		q := i / 10
-		b[bp] = byte('0' + i - q*10)
-		bp--
-		i = q
-	}
-	// i < 10
-	b[bp] = byte('0' + i)
-	return string(b[bp:])
-}
-
-func writeToOut(level Level) bool {
-	if level < LevelWarning {
-		return true
-	}
-	return false
-}
-
 var levelPrefix = [...]string{
 	LevelDebug:    "DEBUG",
 	LevelInfo:     "INFO",

logging/log.go

@@ -1,6 +1,7 @@
 package logging
 
 import (
+	"errors"
 	"fmt"
 	"io"
 	"os"
@@ -11,64 +12,64 @@ import (
 //
 // Log messages consist of four components:
 //
-// 1. The **level** attaches a notion of priority to the log message.
+//  1. The **level** attaches a notion of priority to the log message.
-//    Several log levels are available:
+//     Several log levels are available:
 //
-//    + FATAL (32): the system is in an unsuable state, and cannot
+//     + FATAL (32): the system is in an unusable state and cannot
-//      continue to run. Most of the logging for this will cause the
+//     continue to run. Most of the logging for this will cause the
-//      program to exit with an error code.
+//     program to exit with an error code.
-//    + CRITICAL (16): critical conditions. The error, if uncorrected, is
+//     + CRITICAL (16): critical conditions. The error, if uncorrected, is
-//      likely to cause a fatal condition shortly.  An example is running
+//     likely to cause a fatal condition shortly.  An example is running
-//      out of disk space. This is something that the ops team should get
+//     out of disk space. This is something that the ops team should get
-//      paged for.
+//     paged for.
-//    + ERROR (8): error conditions. A single error doesn't require an
+//     + ERROR (8): error conditions. A single error doesn't require an
-//      ops team to be paged, but repeated errors should often trigger a
+//     ops team to be paged, but repeated errors should often trigger a
-//      page based on threshold triggers. An example is a network
+//     page based on threshold triggers. An example is a network
-//      failure: it might be a transient failure (these do happen), but
+//     failure: it might be a transient failure (these do happen), but
-//      most of the time it's self-correcting.
+//     most of the time it's self-correcting.
-//    + WARNING (4): warning conditions. An example of this is a bad
+//     + WARNING (4): warning conditions. An example of this is a bad
-//      request sent to a server. This isn't an error on the part of the
+//     request sent to a server. This isn't an error on the part of the
-//      program, but it may be indicative of other things. Like errors,
+//     program, but it may be indicative of other things. Like errors,
-//      the ops team shouldn't be paged for errors, but a page might be
+//     the ops team shouldn't be paged for errors, but a page might be
-//      triggered if a certain threshold of warnings is reached (which is
+//     triggered if a certain threshold of warnings is reached (which is
-//      typically much higher than errors). For example, repeated
+//     typically much higher than errors). For example, repeated
-//      warnings might be a sign that the system is under attack.
+//     warnings might be a sign that the system is under attack.
-//    + INFO (2): informational message. This is a normal log message
+//     + INFO (2): informational message. This is a normal log message
-//      that is used to deliver information, such as recording
+//     used to deliver information, such as recording requests. Ops
-//      requests. Ops teams are never paged for informational
+//     teams are never paged for informational messages. This is the
-//      messages. This is the default log level.
+//     default log level.
-//    + DEBUG (1): debug-level message. These are only used during
+//     + DEBUG (1): debug-level message. These are only used during
-//      development or if a deployed system repeatedly sees abnormal
+//     development or if a deployed system repeatedly sees abnormal
-//      errors.
+//     errors.
 //
-//    The numeric values indicate the priority of a given level.
+//     The numeric values indicate the priority of a given level.
 //
-// 2. The **actor** is used to specify which component is generating
+//  2. The **actor** is used to specify which component is generating
-//    the log message. This could be the program name, or it could be
+//     the log message. This could be the program name, or it could be
-//    a specific component inside the system.
+//     a specific component inside the system.
 //
-// 3. The **event** is a short message indicating what happened. This is
+//  3. The **event** is a short message indicating what happened. This is
-//    most like the traditional log message.
+//     most like the traditional log message.
 //
-// 4. The **attributes** are an optional set of key-value string pairs that
+//  4. The **attributes** are an optional set of key-value string pairs that
-//    provide additional information.
+//     provide additional information.
 //
 // Additionally, each log message has an associated timestamp. For the
 // text-based logs, this is "%FT%T%z"; for the binary logs, this is a
 // 64-bit Unix timestamp. An example text-based timestamp might look like ::
 //
-//   [2016-03-27T20:59:27-0700] [INFO] [actor:server event:request received] client=192.168.2.5 request-size=839
+//	[2016-03-27T20:59:27-0700] [INFO] [actor:server event:request received] client=192.168.2.5 request-size=839
 //
 // Note that this is organised in a manner that facilitates parsing::
 //
-//   /\[(\d{4}-\d{3}-\d{2}T\d{2}:\d{2}:\d{2}[+-]\d{4})\] \[(\w+\)]\) \[actor:(.+?) event:(.+?)\]/
+//	/\[(\d{4}-\d{3}-\d{2}T\d{2}:\d{2}:\d{2}[+-]\d{4})\] \[(\w+\)]\) \[actor:(.+?) event:(.+?)\]/
 //
 // will cover the header:
 //
-// + ``$1`` contains the timestamp
+// + “$1“ contains the timestamp
-// + ``$2`` contains the level
+// + “$2“ contains the level
-// + ``$3`` contains the actor
+// + “$3“ contains the actor
-// + ``$4`` contains the event
+// + “$4“ contains the event.
 type Logger interface {
 	// SetLevel sets the minimum log level.
 	SetLevel(Level)
@@ -131,7 +132,7 @@ func (lw *LogWriter) output(w io.Writer, lvl Level, actor, event string, attrs m
 }
 
 // Debug emits a debug-level message. These are only used during
-// development or if a deployed system repeatedly sees abnormal
+// development, or if a deployed system repeatedly sees abnormal
 // errors.
 //
 // Actor specifies the component emitting the message; event indicates
@@ -213,7 +214,7 @@ func (lw *LogWriter) Critical(actor, event string, attrs map[string]string) {
 	lw.output(lw.we, LevelCritical, actor, event, attrs)
 }
 
-// Fatal emits a message indicating that the system is in an unsuable
+// Fatal emits a message indicating that the system is in an unusable
 // state, and cannot continue to run. The program will exit with exit
 // code 1.
 //
@@ -229,9 +230,9 @@ func (lw *LogWriter) Fatal(actor, event string, attrs map[string]string) {
 	os.Exit(1)
 }
 
-// FatalCode emits a message indicating that the system is in an unsuable
+// FatalCode emits a message indicating that the system is in an unusable
 // state, and cannot continue to run. The program will exit with the
-// exit code speicfied in the exitcode argument.
+// exit code specified in the exitcode argument.
 //
 // Actor specifies the component emitting the message; event indicates
 // the event that caused the log message to be emitted. attrs is a map
@@ -245,7 +246,7 @@ func (lw *LogWriter) FatalCode(exitcode int, actor, event string, attrs map[stri
 	os.Exit(exitcode)
 }
 
-// FatalNoDie emits a message indicating that the system is in an unsuable
+// FatalNoDie emits a message indicating that the system is in an unusable
 // state, and cannot continue to run. The program will not exit; it is
 // assumed that the caller has some final clean up to perform.
 //
@@ -314,11 +315,17 @@ func (m *Multi) Status() error {
 }
 
 func (m *Multi) Close() error {
+	var errs []error
 	for _, l := range m.loggers {
-		l.Close()
+		if err := l.Close(); err != nil {
+			errs = append(errs, err)
+		}
 	}
 
-	return nil
+	if len(errs) == 0 {
+		return nil
+	}
+	return errors.Join(errs...)
 }
 
 func (m *Multi) Debug(actor, event string, attrs map[string]string) {

logging/log_test.go

@@ -1,30 +1,32 @@
-package logging
+package logging_test
 
 import (
 	"bytes"
 	"fmt"
 	"os"
 	"testing"
+
+	"git.wntrmute.dev/kyle/goutils/logging"
 )
 
 // A list of implementations that should be tested.
-var implementations []Logger
+var implementations []logging.Logger
 
 func init() {
-	lw := NewLogWriter(&bytes.Buffer{}, nil)
+	lw := logging.NewLogWriter(&bytes.Buffer{}, nil)
-	cw := NewConsole()
+	cw := logging.NewConsole()
 
 	implementations = append(implementations, lw)
 	implementations = append(implementations, cw)
 }
 
 func TestFileSetup(t *testing.T) {
-	fw1, err := NewFile("fw1.log", true)
+	fw1, err := logging.NewFile("fw1.log", true)
 	if err != nil {
 		t.Fatalf("failed to create new file logger: %v", err)
 	}
 
-	fw2, err := NewSplitFile("fw2.log", "fw2.err", true)
+	fw2, err := logging.NewSplitFile("fw2.log", "fw2.err", true)
 	if err != nil {
 		t.Fatalf("failed to create new split file logger: %v", err)
 	}
@@ -33,7 +35,7 @@ func TestFileSetup(t *testing.T) {
 	implementations = append(implementations, fw2)
 }
 
-func TestImplementations(t *testing.T) {
+func TestImplementations(_ *testing.T) {
 	for _, l := range implementations {
 		l.Info("TestImplementations", "Info message",
 			map[string]string{"type": fmt.Sprintf("%T", l)})
@@ -44,20 +46,30 @@ func TestImplementations(t *testing.T) {
 
 func TestCloseLoggers(t *testing.T) {
 	for _, l := range implementations {
-		l.Close()
+		if err := l.Close(); err != nil {
+			t.Errorf("failed to close logger: %v", err)
+		}
 	}
 }
 
 func TestDestroyLogFiles(t *testing.T) {
-	os.Remove("fw1.log")
+	if err := os.Remove("fw1.log"); err != nil {
-	os.Remove("fw2.log")
+		t.Errorf("failed to remove fw1.log: %v", err)
-	os.Remove("fw2.err")
+	}
+
+	if err := os.Remove("fw2.log"); err != nil {
+		t.Errorf("failed to remove fw2.log: %v", err)
+	}
+
+	if err := os.Remove("fw2.err"); err != nil {
+		t.Errorf("failed to remove fw2.err: %v", err)
+	}
 }
 
 func TestMulti(t *testing.T) {
-	c1 := NewConsole()
+	c1 := logging.NewConsole()
-	c2 := NewConsole()
+	c2 := logging.NewConsole()
-	m := NewMulti(c1, c2)
+	m := logging.NewMulti(c1, c2)
 	if !m.Good() {
 		t.Fatal("failed to set up multi logger")
 	}

mwc/mwc.go

@@ -8,15 +8,15 @@ type mwc struct {
 }
 
 // Write implements the Writer interface.
-func (t *mwc) Write(p []byte) (n int, err error) {
+func (t *mwc) Write(p []byte) (int, error) {
 	for _, w := range t.wcs {
-		n, err = w.Write(p)
+		n, err := w.Write(p)
 		if err != nil {
-			return
+			return n, err
 		}
 		if n != len(p) {
 			err = io.ErrShortWrite
-			return
+			return n, err
 		}
 	}
 	return len(p), nil

mwc/mwc_test.go

@@ -1,10 +1,11 @@
-package mwc
+package mwc_test
 
 import (
 	"bytes"
 	"testing"
 
 	"git.wntrmute.dev/kyle/goutils/assert"
+	"git.wntrmute.dev/kyle/goutils/mwc"
 	"git.wntrmute.dev/kyle/goutils/testio"
 )
 
@@ -12,7 +13,7 @@ func TestMWC(t *testing.T) {
 	buf1 := testio.NewBufCloser(nil)
 	buf2 := testio.NewBufCloser(nil)
 
-	mwc := MultiWriteCloser(buf1, buf2)
+	mwc := mwc.MultiWriteCloser(buf1, buf2)
 
 	_, err := mwc.Write([]byte("hello, world"))
 	assert.NoErrorT(t, err)
@@ -30,15 +31,15 @@ func TestMWCShort(t *testing.T) {
 	buf3 := testio.NewBrokenWriter(5)
 	buf4 := testio.NewSilentBrokenWriter(5)
 
-	mwc := MultiWriteCloser(buf1, buf2, buf3)
+	multiWriter := mwc.MultiWriteCloser(buf1, buf2, buf3)
-	defer mwc.Close()
+	defer multiWriter.Close()
 
-	_, err := mwc.Write([]byte("hello, world"))
+	_, err := multiWriter.Write([]byte("hello, world"))
 	assert.ErrorT(t, err, "expected a short write error", "but no error occurred")
-	mwc.Close()
+	multiWriter.Close()
 
-	mwc = MultiWriteCloser(buf1, buf2, buf4)
+	multiWriter = mwc.MultiWriteCloser(buf1, buf2, buf4)
-	_, err = mwc.Write([]byte("hello, world"))
+	_, err = multiWriter.Write([]byte("hello, world"))
 	assert.ErrorT(t, err, "expected a short write error", "but no error occurred")
 }
 
@@ -47,7 +48,7 @@ func TestMWCClose(t *testing.T) {
 	buf2 := testio.NewBufCloser(nil)
 	buf3 := testio.NewBrokenCloser(nil)
 
-	mwc := MultiWriteCloser(buf1, buf2, buf3)
+	mwc := mwc.MultiWriteCloser(buf1, buf2, buf3)
 	_, err := mwc.Write([]byte("hello, world"))
 	assert.NoErrorT(t, err)
 

rand/rand.go

@@ -1,49 +0,0 @@
-// Package rand contains utilities for interacting with math/rand, including
-// seeding from a random sed.
-package rand
-
-import (
-	"crypto/rand"
-	"encoding/binary"
-	mrand "math/rand"
-)
-
-// CryptoUint64 generates a cryptographically-secure 64-bit integer.
-func CryptoUint64() (uint64, error) {
-	bs := make([]byte, 8)
-	_, err := rand.Read(bs)
-	if err != nil {
-		return 0, err
-	}
-
-	return binary.BigEndian.Uint64(bs), nil
-}
-
-// Seed initialises the non-cryptographic PRNG with a random,
-// cryptographically secure value. This is done just as a good
-// way to make this random. The returned 64-bit value is the seed.
-func Seed() (uint64, error) {
-	seed, err := CryptoUint64()
-	if err != nil {
-		return 0, err
-	}
-
-	// NB: this is permitted.
-	mrand.Seed(int64(seed))
-	return seed, nil
-}
-
-// Int is a wrapper for math.Int so only one package needs to be imported.
-func Int() int {
-	return mrand.Int()
-}
-
-// Intn is a wrapper for math.Intn so only one package needs to be imported.
-func Intn(max int) int {
-	return mrand.Intn(max)
-}
-
-// Intn2 returns a random value between min and max, inclusive.
-func Intn2(min, max int) int {
-	return Intn(max-min) + min
-}

rand/rand_test.go

@@ -1,74 +0,0 @@
-package rand
-
-import (
-	"fmt"
-	mrand "math/rand"
-	"testing"
-)
-
-func TestCryptoUint64(t *testing.T) {
-	n1, err := CryptoUint64()
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	n2, err := CryptoUint64()
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	// This has such a low chance of occurring that it's likely to be
-	// indicative of a bad CSPRNG.
-	if n1 == n2 {
-		t.Fatalf("repeated random uint64s: %d", n1)
-	}
-}
-
-func TestIntn(t *testing.T) {
-	expected := []int{3081, 4887, 4847, 1059, 3081}
-	mrand.Seed(1)
-	for i := 0; i < 5; i++ {
-		n := Intn2(1000, 5000)
-
-		if n != expected[i] {
-			fmt.Printf("invalid sequence at %d: expected %d, have %d", i, expected[i], n)
-		}
-	}
-}
-
-func TestSeed(t *testing.T) {
-	seed1, err := Seed()
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	var seed2 uint64
-	n1 := Int()
-	tries := 0
-
-	for {
-		seed2, err = Seed()
-		if err != nil {
-			t.Fatal(err)
-		}
-
-		if seed1 != seed2 {
-			break
-		}
-
-		tries++
-
-		if tries > 3 {
-			t.Fatal("can't generate two unique seeds")
-		}
-	}
-
-	n2 := Int()
-
-	// Again, this not impossible, merely statistically improbably and a
-	// potential canary for RNG issues.
-	if n1 == n2 {
-		t.Fatalf("repeated integers fresh from two unique seeds: %d/%d -> %d",
-			seed1, seed2, n1)
-	}
-}

sbuf/sbuf.go

@@ -15,7 +15,7 @@ func zero(in []byte, n int) {
 		stop = len(in)
 	}
 
-	for i := 0; i < stop; i++ {
+	for i := range stop {
 		in[i] ^= in[i]
 	}
 }
@@ -37,7 +37,10 @@ func NewBuffer(n int) *Buffer {
 // original data will be wiped.
 func NewBufferFrom(p []byte) *Buffer {
 	buf := NewBuffer(len(p))
-	buf.Write(p)
+	_, err := buf.Write(p)
+	if err != nil {
+		return nil
+	}
 	zero(p, len(p))
 	return buf
 }
@@ -54,10 +57,7 @@ func (buf *Buffer) Read(p []byte) (int, error) {
 		return 0, io.EOF
 	}
 
-	copyLength := len(p)
+	copyLength := min(len(p), len(buf.buf))
-	if copyLength > len(buf.buf) {
-		copyLength = len(buf.buf)
-	}
 
 	copy(p, buf.buf)
 	zero(buf.buf, len(p))
@@ -91,10 +91,7 @@ func (buf *Buffer) Write(p []byte) (int, error) {
 	r := len(buf.buf) + len(p)
 	if cap(buf.buf) < r {
 		l := r
-		for {
+		for l <= r {
-			if l > r {
-				break
-			}
 			l *= 2
 		}
 		buf.grow(l - cap(buf.buf))
@@ -107,7 +104,7 @@ func (buf *Buffer) Write(p []byte) (int, error) {
 func (buf *Buffer) WriteByte(c byte) error {
 	r := len(buf.buf) + 1
 	if cap(buf.buf) < r {
-		l := r * 2
+		l := r << 1
 		buf.grow(l - cap(buf.buf))
 	}
 	buf.buf = append(buf.buf, c)
@@ -138,7 +135,7 @@ func (buf *Buffer) Bytes() []byte {
 	}
 
 	p := make([]byte, buf.Len())
-	buf.Read(p)
+	_, _ = buf.Read(p)
 	buf.Close()
 	return p
 }

sbuf/sbuf_test.go

@@ -1,15 +1,16 @@
-package sbuf
+package sbuf_test
 
 import (
 	"bytes"
 	"crypto/rand"
 	"testing"
 
+	"git.wntrmute.dev/kyle/goutils/sbuf"
 	"golang.org/x/crypto/nacl/box"
 )
 
 var (
-	buf          = &Buffer{}
+	buf          = &sbuf.Buffer{}
 	testMessage1 = []byte("round and round and round we go, where we stop, no one knows")
 	testMessage2 = []byte("the deconstruction of falling stars")
 )
@@ -113,23 +114,23 @@ func TestShortRead(t *testing.T) {
 }
 
 func TestNewBuffer(t *testing.T) {
-	buf := NewBuffer(32)
+	testBuffer := sbuf.NewBuffer(32)
-	if len(buf.buf) != 0 {
+	if testBuffer.Len() != 0 {
 		t.Fatalf("expected new buffer length to be 0, have %d",
-			len(buf.buf))
+			testBuffer.Len())
 	}
 
-	if cap(buf.buf) != 32 {
+	if testBuffer.Cap() != 32 {
 		t.Fatalf("expected new buffer capacity to be 0, have %d",
-			cap(buf.buf))
+			testBuffer.Cap())
 	}
 }
 
 func TestNewBufferFrom(t *testing.T) {
 	p := make([]byte, len(testMessage1))
 	copy(p, testMessage1)
-	buf := NewBufferFrom(p)
+	testBuffer := sbuf.NewBufferFrom(p)
-	if !bytes.Equal(buf.buf, testMessage1) {
+	if !bytes.Equal(testBuffer.Bytes(), testMessage1) {
 		t.Fatal("new buffer wasn't constructed properly")
 	}
 }
@@ -137,10 +138,10 @@ func TestNewBufferFrom(t *testing.T) {
 func TestBytes(t *testing.T) {
 	p := make([]byte, len(testMessage1))
 	copy(p, testMessage1)
-	buf := NewBufferFrom(p)
+	testBuffer := sbuf.NewBufferFrom(p)
 
-	out := buf.Bytes()
+	out := testBuffer.Bytes()
-	if buf.buf != nil {
+	if testBuffer.Len() != 0 {
 		t.Fatal("buffer was not closed")
 	}
 
@@ -148,21 +149,21 @@ func TestBytes(t *testing.T) {
 		t.Fatal("buffer did not return the right data")
 	}
 
-	out = buf.Bytes()
+	out = testBuffer.Bytes()
 	if out != nil {
 		t.Fatal("a closed buffer should return nil for Bytes")
 	}
 }
 
 func TestRWByte(t *testing.T) {
-	buf := NewBuffer(0)
+	testBuffer := sbuf.NewBuffer(0)
 	c := byte(42)
-	err := buf.WriteByte(c)
+	err := testBuffer.WriteByte(c)
 	if err != nil {
 		t.Fatalf("%v", err)
 	}
 
-	c, err = buf.ReadByte()
+	c, err = testBuffer.ReadByte()
 	if err != nil {
 		t.Fatalf("%v", err)
 	}
@@ -171,22 +172,21 @@ func TestRWByte(t *testing.T) {
 		t.Fatalf("Expected 42, have %d", c)
 	}
 
-	_, err = buf.ReadByte()
+	_, err = testBuffer.ReadByte()
 	if err == nil {
 		t.Fatal("Expected EOF")
 	}
 }
 
 func BenchmarkRead(b *testing.B) {
-	b.N = 2000
 	pub, priv, err := box.GenerateKey(rand.Reader)
 	if err != nil {
 		b.Fatalf("%v", err)
 	}
 	b.ReportAllocs()
 
-	for i := 0; i < b.N; i++ {
+	for b.Loop() {
-		_, err := buf.Write(priv[:])
+		_, err = buf.Write(priv[:])
 		if err != nil {
 			b.Fatalf("%v", err)
 		}
@@ -204,11 +204,11 @@ func BenchmarkFixed(b *testing.B) {
 		b.Fatalf("%v", err)
 	}
 
-	buf = NewBuffer(64 * b.N)
+	buf = sbuf.NewBuffer(64 * b.N)
 	b.ReportAllocs()
 
-	for i := 0; i < b.N; i++ {
+	for b.Loop() {
-		_, err := buf.Write(priv[:])
+		_, err = buf.Write(priv[:])
 		if err != nil {
 			b.Fatalf("%v", err)
 		}

seekbuf/seekbuf_test.go

@@ -1,18 +1,20 @@
-package seekbuf
+package seekbuf_test
 
 import (
 	"fmt"
 	"testing"
 
 	"git.wntrmute.dev/kyle/goutils/assert"
+	"git.wntrmute.dev/kyle/goutils/seekbuf"
 )
 
 func TestSeeking(t *testing.T) {
 	partA := []byte("hello, ")
 	partB := []byte("world!")
 
-	buf := New(partA)
+	buf := seekbuf.New(partA)
-	assert.BoolT(t, buf.Len() == len(partA), fmt.Sprintf("on init: have length %d, want length %d", buf.Len(), len(partA)))
+	assert.BoolT(t, buf.Len() == len(partA),
+		fmt.Sprintf("on init: have length %d, want length %d", buf.Len(), len(partA)))
 
 	b := make([]byte, 32)
 
@@ -32,7 +34,8 @@ func TestSeeking(t *testing.T) {
 
 	partsLen := len(partA) + len(partB)
 	buf.Rewind()
-	assert.BoolT(t, buf.Len() == partsLen, fmt.Sprintf("after rewinding: have length %d, want length %d", buf.Len(), partsLen))
+	assert.BoolT(t, buf.Len() == partsLen,
+		fmt.Sprintf("after rewinding: have length %d, want length %d", buf.Len(), partsLen))
 
 	buf.Close()
 	assert.BoolT(t, buf.Len() == 0, fmt.Sprintf("after closing, have length %d, want length 0", buf.Len()))

tee/tee.go

@@ -17,23 +17,6 @@ type Tee struct {
 	Verbose bool
 }
 
-func (t *Tee) Write(p []byte) (int, error) {
-	n, err := os.Stdout.Write(p)
-	if err != nil {
-		return n, err
-	}
-
-	if t.f != nil {
-		return t.f.Write(p)
-	}
-	return n, nil
-}
-
-// Close calls Close on the underlying file.
-func (t *Tee) Close() error {
-	return t.f.Close()
-}
-
 // NewOut writes to standard output only. The file is created, not
 // appended to.
 func NewOut(logFile string) (*Tee, error) {
@@ -48,9 +31,32 @@ func NewOut(logFile string) (*Tee, error) {
 	return &Tee{f: f}, nil
 }
 
+func (t *Tee) Write(p []byte) (int, error) {
+	n, err := os.Stdout.Write(p)
+	if err != nil {
+		return n, err
+	}
+
+	if t.f != nil {
+		return t.f.Write(p)
+	}
+	return n, nil
+}
+
+// Close calls Close on the underlying file if present.
+// It is safe to call Close on a Tee with no file; in that case, it returns nil.
+func (t *Tee) Close() error {
+	if t == nil || t.f == nil {
+		return nil
+	}
+	err := t.f.Close()
+	t.f = nil
+	return err
+}
+
 // Printf formats according to a format specifier and writes to the
 // tee instance.
-func (t *Tee) Printf(format string, args ...interface{}) (int, error) {
+func (t *Tee) Printf(format string, args ...any) (int, error) {
 	s := fmt.Sprintf(format, args...)
 	n, err := os.Stdout.WriteString(s)
 	if err != nil {
@@ -66,7 +72,7 @@ func (t *Tee) Printf(format string, args ...interface{}) (int, error) {
 
 // VPrintf is a variant of Printf that only prints if the Tee's
 // Verbose flag is set.
-func (t *Tee) VPrintf(format string, args ...interface{}) (int, error) {
+func (t *Tee) VPrintf(format string, args ...any) (int, error) {
 	if t.Verbose {
 		return t.Printf(format, args...)
 	}
@@ -87,12 +93,12 @@ func Open(logFile string) error {
 
 // Printf formats according to a format specifier and writes to the
 // global tee.
-func Printf(format string, args ...interface{}) (int, error) {
+func Printf(format string, args ...any) (int, error) {
 	return globalTee.Printf(format, args...)
 }
 
 // VPrintf calls VPrintf on the global tee instance.
-func VPrintf(format string, args ...interface{}) (int, error) {
+func VPrintf(format string, args ...any) (int, error) {
 	return globalTee.VPrintf(format, args...)
 }
 

tee/tee_test.go

@@ -0,0 +1,197 @@
+package tee_test
+
+import (
+	"io"
+	"os"
+	"path/filepath"
+	"testing"
+
+	tee "git.wntrmute.dev/kyle/goutils/tee"
+)
+
+// captureStdout redirects os.Stdout for the duration of fn and returns what was written.
+func captureStdout(t *testing.T, fn func()) string {
+	t.Helper()
+	r, w, err := os.Pipe()
+	if err != nil {
+		t.Fatalf("pipe: %v", err)
+	}
+	old := os.Stdout
+	os.Stdout = w
+	defer func() { os.Stdout = old }()
+
+	fn()
+
+	// Close writer to unblock reader and restore stdout
+	_ = w.Close()
+	b, _ := io.ReadAll(r)
+	_ = r.Close()
+	return string(b)
+}
+
+func TestNewOutEmpty_WritesToStdoutOnly(t *testing.T) {
+	teeInst, err := tee.NewOut("")
+	if err != nil {
+		t.Fatalf("NewOut: %v", err)
+	}
+
+	out := captureStdout(t, func() {
+		var n int
+		if n, err = teeInst.Write([]byte("abc")); err != nil || n != 3 {
+			t.Fatalf("Write got n=%d err=%v", n, err)
+		}
+
+		if n, err = teeInst.Printf("-%d-", 7); err != nil || n != len("-7-") {
+			t.Fatalf("Printf got n=%d err=%v", n, err)
+		}
+	})
+
+	if out != "abc-7-" {
+		t.Fatalf("stdout = %q, want %q", out, "abc-7-")
+	}
+}
+
+func TestNewOutWithFile_WritesToBoth(t *testing.T) {
+	dir := t.TempDir()
+	logPath := filepath.Join(dir, "log.txt")
+
+	teeInst, err := tee.NewOut(logPath)
+	if err != nil {
+		t.Fatalf("NewOut: %v", err)
+	}
+	defer func() { _ = teeInst.Close() }()
+
+	out := captureStdout(t, func() {
+		if _, err = teeInst.Write([]byte("x")); err != nil {
+			t.Fatalf("Write: %v", err)
+		}
+		if _, err = teeInst.Printf("%s", "y"); err != nil {
+			t.Fatalf("Printf: %v", err)
+		}
+	})
+
+	if out != "xy" {
+		t.Fatalf("stdout = %q, want %q", out, "xy")
+	}
+
+	// Close to flush and release the file before reading
+	if err = teeInst.Close(); err != nil {
+		t.Fatalf("Close: %v", err)
+	}
+
+	data, err := os.ReadFile(logPath)
+	if err != nil {
+		t.Fatalf("ReadFile: %v", err)
+	}
+	if string(data) != "xy" {
+		t.Fatalf("file content = %q, want %q", string(data), "xy")
+	}
+}
+
+func TestVPrintf_VerboseToggle(t *testing.T) {
+	teeInst := &tee.Tee{} // stdout only
+
+	out := captureStdout(t, func() {
+		if n, err := teeInst.VPrintf("hello"); err != nil || n != 0 {
+			t.Fatalf("VPrintf (quiet) got n=%d err=%v", n, err)
+		}
+	})
+	if out != "" {
+		t.Fatalf("stdout = %q, want empty when not verbose", out)
+	}
+
+	teeInst.Verbose = true
+	out = captureStdout(t, func() {
+		if n, err := teeInst.VPrintf("%s", "hello"); err != nil || n != len("hello") {
+			t.Fatalf("VPrintf (verbose) got n=%d err=%v", n, err)
+		}
+	})
+	if out != "hello" {
+		t.Fatalf("stdout = %q, want %q", out, "hello")
+	}
+}
+
+func TestWrite_StdoutErrorDoesNotWriteToFile(t *testing.T) {
+	dir := t.TempDir()
+	logPath := filepath.Join(dir, "log.txt")
+	teeInst, err := tee.NewOut(logPath)
+	if err != nil {
+		t.Fatalf("NewOut: %v", err)
+	}
+	defer func() { _ = teeInst.Close() }()
+
+	// Replace stdout with a closed pipe writer to force write error.
+	r, w, err := os.Pipe()
+	if err != nil {
+		t.Fatalf("pipe: %v", err)
+	}
+	old := os.Stdout
+	os.Stdout = w
+	_ = w.Close() // immediately close to cause EPIPE on write
+	defer func() {
+		os.Stdout = old
+		_ = r.Close()
+	}()
+
+	var n int
+	if n, err = teeInst.Write([]byte("abc")); err == nil {
+		t.Fatalf("expected error writing to closed stdout, got n=%d err=nil", n)
+	}
+
+	// Ensure file remained empty because stdout write failed first.
+	_ = teeInst.Close()
+	data, err := os.ReadFile(logPath)
+	if err != nil {
+		t.Fatalf("ReadFile: %v", err)
+	}
+	if len(data) != 0 {
+		t.Fatalf("file content = %q, want empty due to stdout failure", string(data))
+	}
+}
+
+func TestGlobal_OpenPrintfVPrintfClose(t *testing.T) {
+	// Ensure a clean slate for global tee
+	_ = tee.Close()
+	tee.SetVerbose(false)
+
+	dir := t.TempDir()
+	logPath := filepath.Join(dir, "glog.txt")
+
+	if err := tee.Open(logPath); err != nil {
+		t.Fatalf("Open: %v", err)
+	}
+
+	out := captureStdout(t, func() {
+		if _, err := tee.Printf("A"); err != nil {
+			t.Fatalf("Printf: %v", err)
+		}
+		// Not verbose yet, should not print
+		if n, err := tee.VPrintf("B"); err != nil || n != 0 {
+			t.Fatalf("VPrintf (quiet) n=%d err=%v", n, err)
+		}
+		tee.SetVerbose(true)
+		if _, err := tee.VPrintf("C%d", 1); err != nil {
+			t.Fatalf("VPrintf (verbose): %v", err)
+		}
+	})
+
+	if out != "AC1" {
+		t.Fatalf("stdout = %q, want %q", out, "AC1")
+	}
+
+	if err := tee.Close(); err != nil {
+		t.Fatalf("Close: %v", err)
+	}
+
+	data, err := os.ReadFile(logPath)
+	if err != nil {
+		t.Fatalf("ReadFile: %v", err)
+	}
+	if string(data) != "AC1" {
+		t.Fatalf("file content = %q, want %q", string(data), "AC1")
+	}
+
+	// Reset global tee for other tests/packages
+	_ = tee.Close()
+	tee.SetVerbose(false)
+}

testio/testio.go

@@ -169,6 +169,26 @@ type BufCloser struct {
 	buf *bytes.Buffer
 }
 
+// NewBufCloser creates and initializes a new BufCloser using buf as
+// its initial contents. It is intended to prepare a BufCloser to read
+// existing data. It can also be used to size the internal buffer for
+// writing. To do that, buf should have the desired capacity but a
+// length of zero.
+func NewBufCloser(buf []byte) *BufCloser {
+	bc := new(BufCloser)
+	bc.buf = bytes.NewBuffer(buf)
+	return bc
+}
+
+// NewBufCloserString creates and initializes a new Buffer using
+// string s as its initial contents. It is intended to prepare a
+// buffer to read an existing string.
+func NewBufCloserString(s string) *BufCloser {
+	buf := new(BufCloser)
+	buf.buf = bytes.NewBufferString(s)
+	return buf
+}
+
 // Write writes the data to the BufCloser.
 func (buf *BufCloser) Write(p []byte) (int, error) {
 	return buf.buf.Write(p)
@@ -199,26 +219,6 @@ func (buf *BufCloser) Len() int {
 	return buf.buf.Len()
 }
 
-// NewBufCloser creates and initializes a new BufCloser using buf as
-// its initial contents. It is intended to prepare a BufCloser to read
-// existing data. It can also be used to size the internal buffer for
-// writing. To do that, buf should have the desired capacity but a
-// length of zero.
-func NewBufCloser(buf []byte) *BufCloser {
-	bc := new(BufCloser)
-	bc.buf = bytes.NewBuffer(buf)
-	return bc
-}
-
-// NewBufCloserString creates and initializes a new Buffer using
-// string s as its initial contents. It is intended to prepare a
-// buffer to read an existing string.
-func NewBufCloserString(s string) *BufCloser {
-	buf := new(BufCloser)
-	buf.buf = bytes.NewBufferString(s)
-	return buf
-}
-
 // A LoggingBuffer is an io.ReadWriter that prints the hex value of
 // the data for all reads and writes.
 type LoggingBuffer struct {
@@ -323,6 +323,26 @@ type BrokenCloser struct {
 	buf *bytes.Buffer
 }
 
+// NewBrokenCloser creates and initializes a new BrokenCloser using buf as
+// its initial contents. It is intended to prepare a BrokenCloser to read
+// existing data. It can also be used to size the internal buffer for
+// writing. To do that, buf should have the desired capacity but a
+// length of zero.
+func NewBrokenCloser(buf []byte) *BrokenCloser {
+	bc := new(BrokenCloser)
+	bc.buf = bytes.NewBuffer(buf)
+	return bc
+}
+
+// NewBrokenCloserString creates and initializes a new Buffer using
+// string s as its initial contents. It is intended to prepare a
+// buffer to read an existing string.
+func NewBrokenCloserString(s string) *BrokenCloser {
+	buf := new(BrokenCloser)
+	buf.buf = bytes.NewBufferString(s)
+	return buf
+}
+
 // Write writes the data to the BrokenCloser.
 func (buf *BrokenCloser) Write(p []byte) (int, error) {
 	return buf.buf.Write(p)
@@ -347,23 +367,3 @@ func (buf *BrokenCloser) Reset() {
 func (buf *BrokenCloser) Bytes() []byte {
 	return buf.buf.Bytes()
 }
-
-// NewBrokenCloser creates and initializes a new BrokenCloser using buf as
-// its initial contents. It is intended to prepare a BrokenCloser to read
-// existing data. It can also be used to size the internal buffer for
-// writing. To do that, buf should have the desired capacity but a
-// length of zero.
-func NewBrokenCloser(buf []byte) *BrokenCloser {
-	bc := new(BrokenCloser)
-	bc.buf = bytes.NewBuffer(buf)
-	return bc
-}
-
-// NewBrokenCloserString creates and initializes a new Buffer using
-// string s as its initial contents. It is intended to prepare a
-// buffer to read an existing string.
-func NewBrokenCloserString(s string) *BrokenCloser {
-	buf := new(BrokenCloser)
-	buf.buf = bytes.NewBufferString(s)
-	return buf
-}

testio/testio_test.go

@@ -1,13 +1,15 @@
-package testio
+package testio_test
 
 import (
 	"bytes"
 	"os"
 	"testing"
+
+	"git.wntrmute.dev/kyle/goutils/testio"
 )
 
 func TestBrokenWriter(t *testing.T) {
-	buf := NewBrokenWriter(2)
+	buf := testio.NewBrokenWriter(2)
 	data := []byte{1, 2}
 
 	n, err := buf.Write(data)
@@ -39,7 +41,7 @@ func TestBufCloser(t *testing.T) {
 	var data = []byte{1, 2}
 	var read = make([]byte, 2)
 
-	buf := NewBufCloser(data)
+	buf := testio.NewBufCloser(data)
 	_, err := buf.Read(read)
 	if err != nil {
 		t.Fatalf("%v", err)
@@ -54,7 +56,7 @@ func TestBufCloser(t *testing.T) {
 	buf.Reset()
 
 	s := "hi"
-	buf = NewBufCloserString(s)
+	buf = testio.NewBufCloserString(s)
 
 	read = buf.Bytes()
 	if string(read) != s {
@@ -65,7 +67,7 @@ func TestBufCloser(t *testing.T) {
 func TestLoggingBuffer(t *testing.T) {
 	src := &bytes.Buffer{}
 	data := []byte("AB")
-	lb := NewLoggingBuffer(src)
+	lb := testio.NewLoggingBuffer(src)
 	_, err := lb.Write(data)
 	if err != nil {
 		t.Fatalf("%v", err)
@@ -82,8 +84,8 @@ func TestLoggingBuffer(t *testing.T) {
 	}
 
 	expected := "[TEST] [WRITE] 4142\n"
-	if string(out.Bytes()) != expected {
+	if out.String() != expected {
-		t.Fatalf("expected '%s', have '%s'", expected, string(out.Bytes()))
+		t.Fatalf("expected '%s', have '%s'", expected, out.String())
 	}
 
 	out.Reset()
@@ -96,8 +98,8 @@ func TestLoggingBuffer(t *testing.T) {
 	}
 
 	expected = "[TEST] [READ] 4142\n"
-	if string(out.Bytes()) != expected {
+	if out.String() != expected {
-		t.Fatalf("expected '%s', have '%s'", expected, string(out.Bytes()))
+		t.Fatalf("expected '%s', have '%s'", expected, out.String())
 	}
 
 	out.Reset()
@@ -112,8 +114,8 @@ func TestLoggingBuffer(t *testing.T) {
 	}
 
 	expected = "[READ] 4142\n"
-	if string(out.Bytes()) != expected {
+	if out.String() != expected {
-		t.Fatalf("expected '%s', have '%s'", expected, string(out.Bytes()))
+		t.Fatalf("expected '%s', have '%s'", expected, out.String())
 	}
 
 	src.Reset()
@@ -124,8 +126,8 @@ func TestLoggingBuffer(t *testing.T) {
 }
 
 func TestBrokenReadWriter(t *testing.T) {
-	brw := NewBrokenReadWriter(0, 0)
+	brw := testio.NewBrokenReadWriter(0, 0)
-	lb := NewLoggingBuffer(brw)
+	lb := testio.NewLoggingBuffer(brw)
 
 	var p = make([]byte, 2)
 	var data = []byte("HI")
@@ -177,7 +179,7 @@ func TestBrokenReadWriter(t *testing.T) {
 }
 
 func TestBufferConn(t *testing.T) {
-	bc := NewBufferConn()
+	bc := testio.NewBufferConn()
 
 	client := []byte("AB")
 	peer := []byte("XY")

testutil/testutil.go

@@ -1,16 +0,0 @@
-package testutil
-
-import "io/ioutil"
-
-// TempName generates a new temporary file name. The caller should
-// remove the temporary file when done.
-func TempName() (string, error) {
-	tmpf, err := ioutil.TempFile("", "transport_cachedkp_")
-	if err != nil {
-		return "", err
-	}
-
-	name := tmpf.Name()
-	tmpf.Close()
-	return name, nil
-}