add CI task for error check linters

.github/workflows/golangci-lint.yml

@@ -0,0 +1,28 @@
+name: golangci-lint
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  golangci:
+    name: lint
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        go-version: [1.16.x]
+        os: [ubuntu-latest]  # other options: macos-latest, windows-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v2
+        with:
+          # Required: the version of golangci-lint is required and must be specified without patch version
+          version: latest
+          # the following causes golangci-init to do nothing, so all it does is install golang and golangci
+          args: --version
+          # Show only new issues if it's a pull request. The default value is `false`.
+          # only-new-issues: true
+      - name: run ci linter
+        run: make ci-lint

.golangci.toml

@@ -0,0 +1,27 @@
+[run]
+concurrency = 4
+timeout = "1m"
+issues-exit-code = 0
+modules-download-mode = "readonly"
+allow-parallel-runners = true
+skip-dirs = ["internal/repotools"]
+skip-dirs-use-default = true
+
+[output]
+format = "github-actions"
+
+[linters-settings.cyclop]
+skip-tests = false
+
+[linters-settings.errcheck]
+check-blank = true
+
+[linters]
+disable-all = true
+enable = ["errcheck"]
+fast = false
+
+[issues]
+exclude-use-default = false
+
+# Refer config definitions at https://golangci-lint.run/usage/configuration/#config-file

Makefile

@@ -306,6 +306,27 @@ ci-test-generate-validate:
 	if [ "$$gitstatus" != "" ] && [ "$$gitstatus" != "skipping validation" ]; then echo "$$gitstatus"; exit 1; fi
 	git update-index --no-assume-unchanged go.mod go.sum
 
+ci-lint: ci-lint-.
+
+ci-lint-%:
+	@# Run golangci-lint command that uses the pattern to define the root path that the
+	@# module check will start from. Strips off the "ci-lint-" and
+	@# replaces all "_" with "/".
+	@#
+	@# e.g. ci-lint-internal_protocoltest
+	cd ./internal/repotools/cmd/eachmodule \
+		&& go run . -p $(subst _,/,$(subst ci-lint-,,$@)) \
+			-fail-fast=false \
+			-c 1 \
+			-skip="internal/repotools" \
+			"golangci-lint run"
+
+ci-lint-install:
+	@# Installs golangci-lint at GoPATH.
+	@# This should be used to run golangci-lint locally.
+	@#
+	go install github.com/golangci/golangci-lint/cmd/golangci-lint@latest
+
 #######################
 # Integration Testing #
 #######################