golangci-lint

golangci-lint documentation

Version in Mega-Linter: 1.42.1
Visit Official Web Site
See How to configure golangci-lint rules
- If custom .golangci.yml config file is not found, .golangci.yml will be used
See How to disable golangci-lint rules in files
See Index of problems detected by golangci-lint

Configuration in Mega-Linter

Enable golangci-lint by adding GO_GOLANGCI_LINT in ENABLE_LINTERS variable
Disable golangci-lint by adding GO_GOLANGCI_LINT in DISABLE_LINTERS variable

Variable	Description	Default value
GO_GOLANGCI_LINT_ARGUMENTS	User custom arguments to add in linter CLI call Ex: `-s --foo "bar"`
GO_GOLANGCI_LINT_FILTER_REGEX_INCLUDE	Custom regex including filter Ex: `(src\\|lib)`	Include every file
GO_GOLANGCI_LINT_FILTER_REGEX_EXCLUDE	Custom regex excluding filter Ex: `(test\\|examples)`	Exclude no file
GO_GOLANGCI_LINT_CLI_LINT_MODE	Override default CLI lint mode - `file`: Calls the linter for each file - `list_of_files`: Call the linter with the list of files as argument - `project`: Call the linter from the root of the project	`{linter.cli_lint_mode}`
GO_GOLANGCI_LINT_FILE_EXTENSIONS	Allowed file extensions. `"*"` matches any extension, `""` matches empty extension. Empty list excludes all files Ex: `[".py", ""]`	`[".go"]`
GO_GOLANGCI_LINT_FILE_NAMES_REGEX	File name regex filters. Regular expression list for filtering files by their base names using regex full match. Empty list includes all files Ex: `["Dockerfile(-.+)?", "Jenkinsfile"]`	Include every file
GO_GOLANGCI_LINT_PRE_COMMANDS	List of bash commands to run before the linter	None
GO_GOLANGCI_LINT_POST_COMMANDS	List of bash commands to run after the linter	None
GO_GOLANGCI_LINT_CONFIG_FILE	golangci-lint configuration file name Use `LINTER_DEFAULT` to let the linter find it	`.golangci.yml`
GO_GOLANGCI_LINT_RULES_PATH	Path where to find linter configuration file	Workspace folder, then Mega-Linter default rules
GO_GOLANGCI_LINT_DISABLE_ERRORS	Run linter but consider errors as warnings	`false`
GO_GOLANGCI_LINT_DISABLE_ERRORS_IF_LESS_THAN	Maximum number of errors allowed	`0`

IDE Integration

Use golangci-lint in your favorite IDE to catch errors before Mega-Linter !

IDE	Extension Name	Install
Atom	go-plus	Visit Web Site
Emacs	flycheck-golandci-lint	Visit Web Site
Emacs	SpaceMacs	Visit Web Site
goland	goland	Visit Web Site
Sublime Text	SublimeLinter-contrib-golang-cilint	Visit Web Site
vim	vim-go	Visit Web Site
Visual Studio Code	vscode.Go

Mega-Linter Flavours

This linter is available in the following flavours

	Flavor	Description	Embedded linters	Info
	all	Default Mega-Linter Flavor	94
	go	Optimized for GO based projects	42

Behind the scenes

How are identified applicable files

File extensions: .go

How the linting is performed

golangci-lint is called one time by identified file

Example calls

golangci-lint run myfile.go

golangci-lint run -c .golangci.yml myfile.go

Help content

Smart, fast linters runner. Run it in cloud for every GitHub pull request on https://golangci.com

Usage:
  golangci-lint [flags]
  golangci-lint [command]

Available Commands:
  cache       Cache control and information
  completion  generate the autocompletion script for the specified shell
  config      Config
  help        Help
  linters     List current linters configuration
  run         Run the linters
  version     Version

Flags:
      --color string              Use color when printing; can be 'always', 'auto', or 'never' (default "auto")
  -j, --concurrency int           Concurrency (default NumCPU) (default 2)
      --cpu-profile-path string   Path to CPU profile output file
  -h, --help                      help for golangci-lint
      --mem-profile-path string   Path to memory profile output file
      --trace-path string         Path to trace output file
  -v, --verbose                   verbose output
      --version                   Print version

Use "golangci-lint [command] --help" for more information about a command.

Installation on mega-linter Docker image

Dockerfile commands :

RUN wget -O- -nv https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh \
    && golangci-lint --version

Example success log

Results of golangci-lint linter (version 1.33.0)
See documentation on https://nvuillam.github.io/mega-linter/descriptors/go_golangci_lint/
-----------------------------------------------

[SUCCESS] .automation/test/golang/golang_good_01.go

Example error log

Results of golangci-lint linter (version 1.33.0)
See documentation on https://nvuillam.github.io/mega-linter/descriptors/go_golangci_lint/
-----------------------------------------------

[ERROR] .automation/test/golang/golang_bad_01.go
    level=error msg="[linters context] typechecking error: .automation/test/golang/golang_bad_01.go:1:1: expected 'package', found 'if'"
    level=warning msg="[runner] Can't run linter goanalysis_metalinter: S1020: failed prerequisites: [(inspect@command-line-arguments, isgenerated@command-line-arguments): analysis skipped: errors in package: [-: .automation/test/golang/golang_bad_01.go:1:1: expected 'package', found 'if']]"
    level=warning msg="[runner] Can't run linter unused: buildir: analysis skipped: errors in package: [-: .automation/test/golang/golang_bad_01.go:1:1: expected 'package', found 'if']"
    level=error msg="Running error: buildir: analysis skipped: errors in package: [-: .automation/test/golang/golang_bad_01.go:1:1: expected 'package', found 'if']"