golangci-lint

Configuration

The config file has lower priority than command-line options. If the same bool/string/int option is provided on the command-line and in the config file, the option from command-line will be used. Slice options (e.g. list of enabled/disabled linters) are combined from the command-line and config file.

To see a list of enabled by your configuration linters:

golangci-lint linters

Command-Line Options

golangci-lint run -h
Usage:
golangci-lint run [flags]
Flags:
--out-format string Format of output: colored-line-number|line-number|json|tab|checkstyle|code-climate|junit-xml|github-actions (default "colored-line-number")
--print-issued-lines Print lines of code with issue (default true)
--print-linter-name Print linter name in issue line (default true)
--uniq-by-line Make issues output unique by line (default true)
--modules-download-mode string Modules download mode. If not empty, passed as -mod=<mode> to go tools
--issues-exit-code int Exit code when issues were found (default 1)
--build-tags strings Build tags
--timeout duration Timeout for total work (default 1m0s)
--tests Analyze tests (*_test.go) (default true)
--print-resources-usage Print avg and max memory usage of golangci-lint and total time
-c, --config PATH Read config from file path PATH
--no-config Don't read config
--skip-dirs strings Regexps of directories to skip
--skip-dirs-use-default Use or not use default excluded directories:
- (^|/)vendor($|/)
- (^|/)third_party($|/)
- (^|/)testdata($|/)
- (^|/)examples($|/)
- (^|/)Godeps($|/)
- (^|/)builtin($|/)
(default true)
--skip-files strings Regexps of files to skip
--allow-parallel-runners Allow multiple parallel golangci-lint instances running. If false (default) - golangci-lint acquires file lock on start.
-E, --enable strings Enable specific linter
-D, --disable strings Disable specific linter
--disable-all Disable all linters
-p, --presets strings Enable presets (bugs|complexity|format|performance|style|unused) of linters. Run 'golangci-lint linters' to see them. This option implies option --disable-all
--fast Run only fast linters from enabled linters set (first run won't be fast)
-e, --exclude strings Exclude issue by regexp
--exclude-use-default Use or not use default excludes:
# EXC0001 errcheck: Almost all programs ignore errors on these functions and in most cases it's ok
- Error return value of .((os\.)?std(out|err)\..*|.*Close|.*Flush|os\.Remove(All)?|.*print(f|ln)?|os\.(Un)?Setenv). is not checked
# EXC0002 golint: Annoying issue about not having a comment. The rare codebase has such comments
- (comment on exported (method|function|type|const)|should have( a package)? comment|comment should be of the form)
# EXC0003 golint: False positive when tests are defined in package 'test'
- func name will be used as test\.Test.* by other packages, and that stutters; consider calling this
# EXC0004 govet: Common false positives
- (possible misuse of unsafe.Pointer|should have signature)
# EXC0005 staticcheck: Developers tend to write in C-style with an explicit 'break' in a 'switch', so it's ok to ignore
- ineffective break statement. Did you mean to break out of the outer loop
# EXC0006 gosec: Too many false-positives on 'unsafe' usage
- Use of unsafe calls should be audited
# EXC0007 gosec: Too many false-positives for parametrized shell calls
- Subprocess launch(ed with variable|ing should be audited)
# EXC0008 gosec: Duplicated errcheck checks
- (G104|G307)
# EXC0009 gosec: Too many issues in popular repos
- (Expect directory permissions to be 0750 or less|Expect file permissions to be 0600 or less)
# EXC0010 gosec: False positive is triggered by 'src, err := ioutil.ReadFile(filename)'
- Potential file inclusion via variable
(default true)
--exclude-case-sensitive If set to true exclude and exclude rules regular expressions are case sensitive
--max-issues-per-linter int Maximum issues count per one linter. Set to 0 to disable (default 50)
--max-same-issues int Maximum count of issues with the same text. Set to 0 to disable (default 3)
-n, --new Show only new issues: if there are unstaged changes or untracked files, only those changes are analyzed, else only changes in HEAD~ are analyzed.
It's a super-useful option for integration of golangci-lint into existing large codebase.
It's not practical to fix all existing issues at the moment of integration: much better to not allow issues in new code.
For CI setups, prefer --new-from-rev=HEAD~, as --new can skip linting the current patch if any scripts generate unstaged files before golangci-lint runs.
--new-from-rev REV Show only new issues created after git revision REV
--new-from-patch PATH Show only new issues created in git patch with file path PATH
--fix Fix found issues (if it's supported by the linter)
-h, --help help for run
Global Flags:
--color string Use color when printing; can be 'always', 'auto', or 'never' (default "auto")
-j, --concurrency int Concurrency (default NumCPU) (default 8)
--cpu-profile-path string Path to CPU profile output file
--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

Config File

GolangCI-Lint looks for config files in the following paths from the current working directory:

  • .golangci.yml
  • .golangci.toml
  • .golangci.json

GolangCI-Lint also searches for config files in all directories from the directory of the first analyzed path up to the root. To see which config file is being used and where it was sourced from run golangci-lint with -v option.

Config options inside the file are identical to command-line options. You can configure specific linters' options only within the config file (not the command-line).

There is a .golangci.example.yml example config file with all supported options, their description and default value:

# This file contains all available configuration options
# with their default values.
# options for analysis running
run:
# default concurrency is a available CPU number
concurrency: 4
# timeout for analysis, e.g. 30s, 5m, default is 1m
timeout: 1m
# exit code when at least one issue was found, default is 1
issues-exit-code: 1
# include test files or not, default is true
tests: true
# list of build tags, all linters use it. Default is empty list.
build-tags:
- mytag
# which dirs to skip: issues from them won't be reported;
# can use regexp here: generated.*, regexp is applied on full path;
# default value is empty list, but default dirs are skipped independently
# from this option's value (see skip-dirs-use-default).
# "/" will be replaced by current OS file path separator to properly work
# on Windows.
skip-dirs:
- src/external_libs
- autogenerated_by_my_lib
# default is true. Enables skipping of directories:
# vendor$, third_party$, testdata$, examples$, Godeps$, builtin$
skip-dirs-use-default: true
# which files to skip: they will be analyzed, but issues from them
# won't be reported. Default value is empty list, but there is
# no need to include all autogenerated files, we confidently recognize
# autogenerated files. If it's not please let us know.
# "/" will be replaced by current OS file path separator to properly work
# on Windows.
skip-files:
- ".*\\.my\\.go$"
- lib/bad.go
# by default isn't set. If set we pass it to "go list -mod={option}". From "go help modules":
# If invoked with -mod=readonly, the go command is disallowed from the implicit
# automatic updating of go.mod described above. Instead, it fails when any changes
# to go.mod are needed. This setting is most useful to check that go.mod does
# not need updates, such as in a continuous integration and testing system.
# If invoked with -mod=vendor, the go command assumes that the vendor
# directory holds the correct copies of dependencies and ignores
# the dependency descriptions in go.mod.
modules-download-mode: readonly|release|vendor
# Allow multiple parallel golangci-lint instances running.
# If false (default) - golangci-lint acquires file lock on start.
allow-parallel-runners: false
# output configuration options
output:
# colored-line-number|line-number|json|tab|checkstyle|code-climate, default is "colored-line-number"
format: colored-line-number
# print lines of code with issue, default is true
print-issued-lines: true
# print linter name in the end of issue text, default is true
print-linter-name: true
# make issues output unique by line, default is true
uniq-by-line: true
# all available settings of specific linters
linters-settings:
dogsled:
# checks assignments with too many blank identifiers; default is 2
max-blank-identifiers: 2
dupl:
# tokens count to trigger issue, 150 by default
threshold: 100
errcheck:
# report about not checking of errors in type assertions: `a := b.(MyStruct)`;
# default is false: such cases aren't reported by default.
check-type-assertions: false
# report about assignment of errors to blank identifier: `num, _ := strconv.Atoi(numStr)`;
# default is false: such cases aren't reported by default.
check-blank: false
# [deprecated] comma-separated list of pairs of the form pkg:regex
# the regex is used to ignore names within pkg. (default "fmt:.*").
# see https://github.com/kisielk/errcheck#the-deprecated-method for details
ignore: fmt:.*,io/ioutil:^Read.*
# path to a file containing a list of functions to exclude from checking
# see https://github.com/kisielk/errcheck#excluding-functions for details
exclude: /path/to/file.txt
exhaustive:
# indicates that switch statements are to be considered exhaustive if a
# 'default' case is present, even if all enum members aren't listed in the
# switch
default-signifies-exhaustive: false
funlen:
lines: 60
statements: 40
gocognit:
# minimal code complexity to report, 30 by default (but we recommend 10-20)
min-complexity: 10
nestif:
# minimal complexity of if statements to report, 5 by default
min-complexity: 4
goconst:
# minimal length of string constant, 3 by default
min-len: 3
# minimal occurrences count to trigger, 3 by default
min-occurrences: 3
gocritic:
# Which checks should be enabled; can't be combined with 'disabled-checks';
# See https://go-critic.github.io/overview#checks-overview
# To check which checks are enabled run `GL_DEBUG=gocritic golangci-lint run`
# By default list of stable checks is used.
enabled-checks:
- rangeValCopy
# Which checks should be disabled; can't be combined with 'enabled-checks'; default is empty
disabled-checks:
- regexpMust
# Enable multiple checks by tags, run `GL_DEBUG=gocritic golangci-lint run` to see all tags and checks.
# Empty list by default. See https://github.com/go-critic/go-critic#usage -> section "Tags".
enabled-tags:
- performance
disabled-tags:
- experimental
settings: # settings passed to gocritic
captLocal: # must be valid enabled check name
paramsOnly: true
rangeValCopy:
sizeThreshold: 32
gocyclo:
# minimal code complexity to report, 30 by default (but we recommend 10-20)
min-complexity: 10
godot:
# check all top-level comments, not only declarations
check-all: false
godox:
# report any comments starting with keywords, this is useful for TODO or FIXME comments that
# might be left in the code accidentally and should be resolved before merging
keywords: # default keywords are TODO, BUG, and FIXME, these can be overwritten by this setting
- NOTE
- OPTIMIZE # marks code that should be optimized before merging
- HACK # marks hack-arounds that should be removed before merging
gofmt:
# simplify code: gofmt with `-s` option, true by default
simplify: true
goheader:
values:
const:
# define here const type values in format k:v, for example:
# YEAR: 2020
# COMPANY: MY COMPANY
regexp:
# define here regexp type values, for example
# AUTHOR: .*@mycompany\.com
template:
# put here copyright header template for source code files, for example:
# {{ AUTHOR }} {{ COMPANY }} {{ YEAR }}
# SPDX-License-Identifier: Apache-2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
template-path:
# also as alternative of directive 'template' you may put the path to file with the template source
goimports:
# put imports beginning with prefix after 3rd-party packages;
# it's a comma-separated list of prefixes
local-prefixes: github.com/org/project
golint:
# minimal confidence for issues, default is 0.8
min-confidence: 0.8
gomnd:
settings:
mnd:
# the list of enabled checks, see https://github.com/tommy-muehle/go-mnd/#checks for description.
checks: argument,case,condition,operation,return,assign
gomodguard:
allowed:
modules: # List of allowed modules
# - gopkg.in/yaml.v2
domains: # List of allowed module domains
# - golang.org
blocked:
modules: # List of blocked modules
# - github.com/uudashr/go-module: # Blocked module
# recommendations: # Recommended modules that should be used instead (Optional)
# - golang.org/x/mod
# reason: "`mod` is the official go.mod parser library." # Reason why the recommended module should be used (Optional)
versions: # List of blocked module version constraints
# - github.com/mitchellh/go-homedir: # Blocked module with version constraint
# version: "< 1.1.0" # Version constraint, see https://github.com/Masterminds/semver#basic-comparisons
# reason: "testing if blocked version constraint works." # Reason why the version constraint exists. (Optional)
govet:
# report about shadowed variables
check-shadowing: true
# settings per analyzer
settings:
printf: # analyzer name, run `go tool vet help` to see all analyzers
funcs: # run `go tool vet help printf` to see available settings for `printf` analyzer
- (github.com/golangci/golangci-lint/pkg/logutils.Log).Infof
- (github.com/golangci/golangci-lint/pkg/logutils.Log).Warnf
- (github.com/golangci/golangci-lint/pkg/logutils.Log).Errorf
- (github.com/golangci/golangci-lint/pkg/logutils.Log).Fatalf
# enable or disable analyzers by name
enable:
- atomicalign
enable-all: false
disable:
- shadow
disable-all: false
depguard:
list-type: blacklist
include-go-root: false
packages:
- github.com/sirupsen/logrus
packages-with-error-message:
# specify an error message to output when a blacklisted package is used
- github.com/sirupsen/logrus: "logging is allowed only by logutils.Log"
lll:
# max line length, lines longer will be reported. Default is 120.
# '\t' is counted as 1 character by default, and can be changed with the tab-width option
line-length: 120
# tab width in spaces. Default to 1.
tab-width: 1
maligned:
# print struct with more effective memory layout or not, false by default
suggest-new: true
misspell:
# Correct spellings using locale preferences for US or UK.
# Default is to use a neutral variety of English.
# Setting locale to US will correct the British spelling of 'colour' to 'color'.
locale: US
ignore-words:
- someword
nakedret:
# make an issue if func has more lines of code than this setting and it has naked returns; default is 30
max-func-lines: 30
prealloc:
# XXX: we don't recommend using this linter before doing performance profiling.
# For most programs usage of prealloc will be a premature optimization.
# Report preallocation suggestions only on simple loops that have no returns/breaks/continues/gotos in them.
# True by default.
simple: true
range-loops: true # Report preallocation suggestions on range loops, true by default
for-loops: false # Report preallocation suggestions on for loops, false by default
nolintlint:
# Enable to ensure that nolint directives are all used. Default is true.
allow-unused: false
# Disable to ensure that nolint directives don't have a leading space. Default is true.
allow-leading-space: true
# Exclude following linters from requiring an explanation. Default is [].
allow-no-explanation: []
# Enable to require an explanation of nonzero length after each nolint directive. Default is false.
require-explanation: true
# Enable to require nolint directives to mention the specific linter being suppressed. Default is false.
require-specific: true
rowserrcheck:
packages:
- github.com/jmoiron/sqlx
testpackage:
# regexp pattern to skip files
skip-regexp: (export|internal)_test\.go
unparam:
# Inspect exported functions, default is false. Set to true if no external program/library imports your code.
# XXX: if you enable this setting, unparam will report a lot of false-positives in text editors:
# if it's called for subdir of a project it can't find external interfaces. All text editor integrations
# with golangci-lint call it on a directory with the changed file.
check-exported: false
unused:
# treat code as a program (not a library) and report unused exported identifiers; default is false.
# XXX: if you enable this setting, unused will report a lot of false-positives in text editors:
# if it's called for subdir of a project it can't find funcs usages. All text editor integrations
# with golangci-lint call it on a directory with the changed file.
check-exported: false
whitespace:
multi-if: false # Enforces newlines (or comments) after every multi-line if statement
multi-func: false # Enforces newlines (or comments) after every multi-line function signature
wsl:
# If true append is only allowed to be cuddled if appending value is
# matching variables, fields or types on line above. Default is true.
strict-append: true
# Allow calls and assignments to be cuddled as long as the lines have any
# matching variables, fields or types. Default is true.
allow-assign-and-call: true
# Allow multiline assignments to be cuddled. Default is true.
allow-multiline-assign: true
# Allow declarations (var) to be cuddled.
allow-cuddle-declarations: false
# Allow trailing comments in ending of blocks
allow-trailing-comment: false
# Force newlines in end of case at this limit (0 = never).
force-case-trailing-whitespace: 0
# Force cuddling of err checks with err var assignment
force-err-cuddling: false
# Allow leading comments to be separated with empty liens
allow-separated-leading-comment: false
# The custom section can be used to define linter plugins to be loaded at runtime. See README doc
# for more info.
custom:
# Each custom linter should have a unique name.
example:
# The path to the plugin *.so. Can be absolute or local. Required for each custom linter
path: /path/to/example.so
# The description of the linter. Optional, just for documentation purposes.
description: This is an example usage of a plugin linter.
# Intended to point to the repo location of the linter. Optional, just for documentation purposes.
original-url: github.com/golangci/example-linter
linters:
enable:
- megacheck
- govet
disable:
- maligned
- prealloc
disable-all: false
presets:
- bugs
- unused
fast: false
issues:
# List of regexps of issue texts to exclude, empty list by default.
# But independently from this option we use default exclude patterns,
# it can be disabled by `exclude-use-default: false`. To list all
# excluded by default patterns execute `golangci-lint run --help`
exclude:
- abcdef
# Excluding configuration per-path, per-linter, per-text and per-source
exclude-rules:
# Exclude some linters from running on tests files.
- path: _test\.go
linters:
- gocyclo
- errcheck
- dupl
- gosec
# Exclude known linters from partially hard-vendored code,
# which is impossible to exclude via "nolint" comments.
- path: internal/hmac/
text: "weak cryptographic primitive"
linters:
- gosec
# Exclude some staticcheck messages
- linters:
- staticcheck
text: "SA9003:"
# Exclude lll issues for long lines with go:generate
- linters:
- lll
source: "^//go:generate "
# Independently from option `exclude` we use default exclude patterns,
# it can be disabled by this option. To list all
# excluded by default patterns execute `golangci-lint run --help`.
# Default value for this option is true.
exclude-use-default: false
# The default value is false. If set to true exclude and exclude-rules
# regular expressions become case sensitive.
exclude-case-sensitive: false
# The list of ids of default excludes to include or disable. By default it's empty.
include:
- EXC0002 # disable excluding of issues about comments from golint
# 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
# Show only new issues: if there are unstaged changes or untracked files,
# only those changes are analyzed, else only changes in HEAD~ are analyzed.
# It's a super-useful option for integration of golangci-lint into existing
# large codebase. It's not practical to fix all existing issues at the moment
# of integration: much better don't allow issues in new code.
# Default is false.
new: false
# Show only new issues created after git revision `REV`
new-from-rev: REV
# Show only new issues created in git patch with set file path.
new-from-patch: path/to/patch/file
severity:
# Default value is empty string.
# Set the default severity for issues. If severity rules are defined and the issues
# do not match or no severity is provided to the rule this will be the default
# severity applied. Severities should match the supported severity names of the
# selected out format.
# - Code climate: https://docs.codeclimate.com/docs/issues#issue-severity
# - Checkstyle: https://checkstyle.sourceforge.io/property_types.html#severity
# - Github: https://help.github.com/en/actions/reference/workflow-commands-for-github-actions#setting-an-error-message
default-severity: error
# The default value is false.
# If set to true severity-rules regular expressions become case sensitive.
case-sensitive: false
# Default value is empty list.
# When a list of severity rules are provided, severity information will be added to lint
# issues. Severity rules have the same filtering capability as exclude rules except you
# are allowed to specify one matcher per severity rule.
# Only affects out formats that support setting severity information.
rules:
- linters:
- dupl
severity: info

It's a .golangci.yml config file of this repo: we enable more linters than the default and have more strict settings:

linters-settings:
depguard:
list-type: blacklist
packages:
# logging is allowed only by logutils.Log, logrus
# is allowed to use only in logutils package
- github.com/sirupsen/logrus
packages-with-error-message:
- github.com/sirupsen/logrus: "logging is allowed only by logutils.Log"
dupl:
threshold: 100
exhaustive:
default-signifies-exhaustive: false
funlen:
lines: 100
statements: 50
goconst:
min-len: 2
min-occurrences: 2
gocritic:
enabled-tags:
- diagnostic
- experimental
- opinionated
- performance
- style
disabled-checks:
- dupImport # https://github.com/go-critic/go-critic/issues/845
- ifElseChain
- octalLiteral
- whyNoLint
- wrapperFunc
gocyclo:
min-complexity: 15
goimports:
local-prefixes: github.com/golangci/golangci-lint
golint:
min-confidence: 0
gomnd:
settings:
mnd:
# don't include the "operation" and "assign"
checks: argument,case,condition,return
govet:
check-shadowing: true
settings:
printf:
funcs:
- (github.com/golangci/golangci-lint/pkg/logutils.Log).Infof
- (github.com/golangci/golangci-lint/pkg/logutils.Log).Warnf
- (github.com/golangci/golangci-lint/pkg/logutils.Log).Errorf
- (github.com/golangci/golangci-lint/pkg/logutils.Log).Fatalf
lll:
line-length: 140
maligned:
suggest-new: true
misspell:
locale: US
nolintlint:
allow-leading-space: true # don't require machine-readable nolint directives (i.e. with no leading space)
allow-unused: false # report any unused nolint directives
require-explanation: false # don't require an explanation for nolint directives
require-specific: false # don't require nolint directives to be specific about which linter is being skipped
linters:
# please, do not use `enable-all`: it's deprecated and will be removed soon.
# inverted configuration with `enable-all` and `disable` is not scalable during updates of golangci-lint
disable-all: true
enable:
- bodyclose
- deadcode
- depguard
- dogsled
- dupl
- errcheck
- exhaustive
- funlen
- gochecknoinits
- goconst
- gocritic
- gocyclo
- gofmt
- goimports
- golint
- gomnd
- goprintffuncname
- gosec
- gosimple
- govet
- ineffassign
- interfacer
- lll
- misspell
- nakedret
- noctx
- nolintlint
- rowserrcheck
- scopelint
- staticcheck
- structcheck
- stylecheck
- typecheck
- unconvert
- unparam
- unused
- varcheck
- whitespace
# don't enable:
# - asciicheck
# - gochecknoglobals
# - gocognit
# - godot
# - godox
# - goerr113
# - maligned
# - nestif
# - prealloc
# - testpackage
# - wsl
issues:
# Excluding configuration per-path, per-linter, per-text and per-source
exclude-rules:
- path: _test\.go
linters:
- gomnd
# https://github.com/go-critic/go-critic/issues/926
- linters:
- gocritic
text: "unnecessaryDefer:"
run:
skip-dirs:
- test/testdata_etc
- internal/cache
- internal/renameio
- internal/robustio
# golangci.com configuration
# https://github.com/golangci/golangci/wiki/Configuration
service:
golangci-lint-version: 1.23.x # use the fixed version to not introduce new linters unexpectedly
prepare:
- echo "here I can run custom commands, but no preparation needed for this repo"
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