syslog: support not using syslog

.circleci/config.yml

@@ -0,0 +1,59 @@
+# Use the latest 2.1 version of CircleCI pipeline process engine.
+# See: https://circleci.com/docs/2.0/configuration-reference
+version: 2.1
+
+commands:
+  setup-bazel:
+    description: |
+      Setup the Bazel build system used for building the repo
+    steps:
+      - run:
+          name: Add Bazel Apt repository
+          command: |
+            sudo apt install curl gnupg
+            curl -fsSL https://bazel.build/bazel-release.pub.gpg | gpg --dearmor > bazel.gpg
+            sudo mv bazel.gpg /etc/apt/trusted.gpg.d/
+            echo "deb [arch=amd64] https://storage.googleapis.com/bazel-apt stable jdk1.8" | sudo tee /etc/apt/sources.list.d/bazel.list
+      - run:
+          name: Install Bazel from Apt
+          command: sudo apt update && sudo apt install bazel
+
+# Define a job to be invoked later in a workflow.
+# See: https://circleci.com/docs/2.0/configuration-reference/#jobs
+jobs:
+  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.
+    # See: https://circleci.com/docs/2.0/configuration-reference/#docker-machine-macos-windows-executor
+    docker:
+      - image: circleci/golang:1.15.8
+    # Add steps to the job
+    # See: https://circleci.com/docs/2.0/configuration-reference/#steps
+    steps:
+      - checkout
+      - setup-bazel
+      - 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: Run tests
+          command: bazel test //...
+      - run:
+          name: Run build
+          command: bazel build //...
+      - store_test_results:
+          path: /tmp/test-reports
+
+# Invoke jobs via workflows
+# See: https://circleci.com/docs/2.0/configuration-reference/#workflows
+workflows:
+  testbuild:
+    jobs:
+      - testbuild

syslog/logger.go

@@ -143,10 +143,12 @@ func Setup(opts *Options) error {
 
 	log.p = priority
 
-	var err error
-	log.l, err = gsyslog.NewLogger(priority, opts.Facility, opts.Tag)
-	if err != nil {
-		return err
+	if opts.WriteSyslog {
+		var err error
+		log.l, err = gsyslog.NewLogger(priority, opts.Facility, opts.Tag)
+		if err != nil {
+			return err
+		}
 	}
 
 	return nil