Cleaning up the codebase.

fileutil/fileutil.go

@@ -1,10 +1,11 @@
+//go:build !windows
+// +build !windows
+
 // Package fileutil contains common file functions.
 package fileutil
 
 import (
 	"os"
-	"path/filepath"
-	"strings"
 
 	"golang.org/x/sys/unix"
 )
@@ -47,10 +48,3 @@ const (
 func Access(path string, mode int) error {
 	return unix.Access(path, uint32(mode))
 }
-
-// ValidateSymlink checks to make sure a symlink exists in some top-level
-// directory.
-func ValidateSymlink(symlink, topLevel string) bool {
-	target, err := filepath.EvalSymlinks(symlink)
-	return strings.HasPrefix(target, topLevel)
-}

fileutil/fileutil_windows.go

@@ -0,0 +1,49 @@
+//go:build windows
+// +build windows
+
+// Package fileutil contains common file functions.
+package fileutil
+
+import (
+	"errors"
+	"os"
+)
+
+// FileDoesExist returns true if the file exists.
+func FileDoesExist(path string) bool {
+	_, err := os.Stat(path)
+	return !os.IsNotExist(err)
+}
+
+// DirectoryDoesExist returns true if the file exists.
+func DirectoryDoesExist(path string) bool {
+	fi, err := os.Stat(path)
+	if err != nil {
+		return false
+	}
+
+	return fi.Mode().IsDir()
+}
+
+const (
+	// AccessExists checks whether the file exists. This is invalid outside of
+	// Unix systems.
+	AccessExists = 0
+
+	// AccessRead checks whether the user has read permissions on
+	// the file. This is invalid outside of Unix systems.
+	AccessRead = 0
+
+	// AccessWrite checks whether the user has write permissions
+	// on the file. This is invalid outside of Unix systems.
+	AccessWrite = 0
+
+	// AccessExec checks whether the user has executable
+	// permissions on the file. This is invalid outside of Unix systems.
+	AccessExec = 0
+)
+
+// Access is a Unix-only call, and has no meaning on Windows.
+func Access(path string, mode int) error {
+	return errors.New("fileutil: Access is meaningless on Windows")
+}

fileutil/symlinks.go

@@ -0,0 +1,16 @@
+package fileutil
+
+import (
+	"path/filepath"
+	"strings"
+)
+
+// ValidateSymlink checks to make sure a symlink exists in some top-level
+// directory.
+func ValidateSymlink(symlink, topLevel string) bool {
+	target, err := filepath.EvalSymlinks(symlink)
+	if err != nil {
+		return false
+	}
+	return strings.HasPrefix(target, topLevel)
+}