Add linting to CI

Signed-off-by: Paul Balogh <[email protected]>

.github/workflows/ci.yml

@@ -9,21 +9,6 @@ on:
   pull_request:
 
 jobs:
-  check-modules:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-      - name: Install Go(lang)
-        uses: actions/setup-go@v5
-        with:
-          go-version: 1.21.x
-      - name: Check module dependencies
-        run: |
-          go version
-          test -z "$(go mod tidy && git status go.* --porcelain)"
-          go mod verify
-
   run-unit-tests:
     runs-on: ubuntu-latest
     steps:

.github/workflows/linter.yml

@@ -0,0 +1,42 @@
+name: Lint
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  check-modules:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Install Go(lang)
+        uses: actions/setup-go@v5
+        with:
+          go-version: 1.21.x
+      - name: Check module dependencies
+        run: |
+          go version
+          test -z "$(go mod tidy && git status go.* --porcelain)"
+          go mod verify
+
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Install Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: 1.21.x
+      - name: Retrieve golangci-lint version
+        run: |
+          echo "Version=$(head -n 1 "${GITHUB_WORKSPACE}/.golangci.yml" | tr -d '# ')" >> $GITHUB_OUTPUT
+        id: version
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v3
+        with:
+          version: ${{ steps.version.outputs.Version }}
+          only-new-issues: true

.golangci.yml

@@ -0,0 +1,126 @@
+# v1.55.2
+# Please don't remove the first line. It is used in CI to determine the golangci-lint version
+run:
+  deadline: 5m
+
+issues:
+  # Maximum issues count per one linter. Set to 0 to disable. Default is 50.
+  max-issues-per-linter: 0
+  # Maximum count of issues with the same text. Set to 0 to disable. Default is 3.
+  max-same-issues: 0
+
+  # We want to try and improve the comments in the k6 codebase, so individual
+  # non-golint items from the default exclusion list will gradually be added
+  # to the exclude-rules below
+  exclude-use-default: false
+
+  exclude-rules:
+    # Exclude duplicate code and function length and complexity checking in test
+    # files (due to common repeats and long functions in test code)
+    - path: _(test|gen)\.go
+      linters:
+        - cyclop
+        - dupl
+        - gocognit
+        - funlen
+        - lll
+    - linters:
+        - forbidigo
+      text: 'use of `os\.(SyscallError|Signal|Interrupt)` forbidden'
+
+linters-settings:
+  nolintlint:
+    # Disable to ensure that nolint directives don't have a leading space. Default is true.
+    allow-leading-space: false
+  exhaustive:
+    default-signifies-exhaustive: true
+  govet:
+    check-shadowing: true
+  cyclop:
+    max-complexity: 25
+  maligned:
+    suggest-new: true
+  dupl:
+    threshold: 150
+  goconst:
+    min-len: 10
+    min-occurrences: 4
+  funlen:
+    lines: 80
+    statements: 60
+  forbidigo:
+    forbid:
+      - '^(fmt\\.Print(|f|ln)|print|println)$'
+      # Forbid everything in os, except os.Signal and os.SyscalError
+      - '^os\.(.*)$(# Using anything except Signal and SyscallError from the os package is forbidden )?'
+      # Forbid everything in syscall except the uppercase constants
+      - '^syscall\.[^A-Z_]+$(# Using anything except constants from the syscall package is forbidden )?'
+      - '^logrus\.Logger$'
+
+linters:
+  disable-all: true
+  enable:
+    - asasalint
+    - asciicheck
+    - bidichk
+    - bodyclose
+    - contextcheck
+    - cyclop
+    - dogsled
+    - dupl
+    - durationcheck
+    - errcheck
+    - errchkjson
+    - errname
+    - errorlint
+    - exhaustive
+    - exportloopref
+    - forbidigo
+    - forcetypeassert
+    - funlen
+    - gocheckcompilerdirectives
+    - gochecknoglobals
+    - gocognit
+    - goconst
+    - gocritic
+    - gofmt
+    - gofumpt
+    - goimports
+    - gomoddirectives
+    - goprintffuncname
+    - gosec
+    - gosimple
+    - govet
+    - importas
+    - ineffassign
+    - interfacebloat
+    - lll
+    - makezero
+    - misspell
+    - nakedret
+    - nestif
+    - nilerr
+    - nilnil
+    - noctx
+    - nolintlint
+    - nosprintfhostport
+    - paralleltest
+    - prealloc
+    - predeclared
+    - promlinter
+    - revive
+    - reassign
+    - rowserrcheck
+    - sqlclosecheck
+    - staticcheck
+    - stylecheck
+    - tenv
+    - tparallel
+    - typecheck
+    - unconvert
+    - unparam
+    - unused
+    - usestdlibvars
+    - wastedassign
+    - whitespace
+  fast: false