# golangci-lint is used in Kubernetes with different configurations that
# enable an increasing amount of checks:
# - golangci.yaml is the most permissive configuration. All existing code
#   passed.
# - golangci-hints.yaml adds checks for code patterns where developer
#   and reviewer may decide whether findings should get addressed before
#   merging. Beware that the golangci-lint output includes also the
#   issues that must be fixed and doesn't indicate how severe each issue
#   is (https://gophers.slack.com/archives/CS0TBRKPC/p1685721815275349).
#
# All three flavors are generated from golangci.yaml.in with
# hack/update-golangci-lint-config.sh.

run:
  timeout: 30m

  # The default is relative to the configuration, which is confusing because
  # then all paths start with ../ to move out of the "hack" directory.
  # `gomod` mirrors the current behavior of `golangci-lint.sh` changing into
  # the root of the repository. Because we are operating in a workspace,
  # the module picked by `gomod` is the main one
  relative-path-mode: gomod

version: "2"

formatters:
  exclusions:
    paths:
      - third_party

output:
  formats:
    text:
      path: stderr

issues:
  max-issues-per-linter: 0
  max-same-issues: 0

linters:
  exclusions:
    paths:
      - third_party

    # Log a warning if an exclusion rule is unused.
    #
    # Uncomment when investigating whether the configuration can be simplified,
    # but beware that golangci-lint then needs to be invoked for the entire
    # repository. Invoking it for individual packages may trigger these warning
    # when the rules are only needed elsewhere.
    #
    # warn-unused: true

    # Excluding configuration per-path, per-linter, per-text and per-source.
    rules:

      # https://github.com/kubernetes/kubernetes/issues/117288#issuecomment-1507012435
      - linters:
          - gocritic
        text: "ifElseChain: rewrite if-else to switch statement"

      # Only packages listed here opt into the strict "exported symbols must be documented".
      #
      # Exclude texts from https://github.com/golangci/golangci-lint/blob/ab3c3cd69e602ff53bb4c3e2c188f0caeb80305d/pkg/config/issues.go#L11-L103
      - linters:
          - revive
          - staticcheck
        text: comment on exported (method|function|type|const)|should have( a package)? comment|comment should be of the form|comment on exported (method|function|type|const)|should have( a package)? comment|comment should be of the form|exported (.+) should have comment( \(or a comment on this block\))? or be unexported|package comment should be of the form "(.+)...|comment on exported (.+) should be of the form "(.+)...|should have a package comment
        path-except: cmd/kubeadm

      # The unused linter that comes from staticcheck currently does not handle types which implement
      # a generic interface. The linter incorrectly reports the implementations of unexported
      # interface methods as unused. See https://github.com/dominikh/go-tools/issues/1294.
      # Rather than exporting the interface methods, which makes the error go away but changes the
      # semantics of the code, we ignore this error for affected files.
      # This can be removed when the staticcheck implementation of this rule is fixed, which may
      # depend on https://github.com/golang/go/issues/63982.
      - linters:
          - unused
        path: staging/src/k8s.io/client-go/util/workqueue/metrics.go

      # SSA Extract calls are allowed in tests.
      - linters:
          - forbidigo
        text: should not be used because managedFields was removed
        path: _test.go$

      # Adding unversioned feature gates is allowed in tests
      - linters:
          - forbidigo
        text: should not use Add, use AddVersioned instead
        path: _test.go$

      # The Kubernetes naming convention for conversion functions uses underscores
      # and intentionally deviates from normal Go conventions to make those function
      # names more readable. Same for SetDefaults_*.
      #
      # https://github.com/kubernetes/kubernetes/issues/117288#issuecomment-1507028627
      # https://github.com/kubernetes/kubernetes/issues/117288#issuecomment-1514201592
      - linters:
          - staticcheck
          - revive
        text: "(ST1003: should not use underscores in Go names; func ([cC]onvert_.*_To_.*|[sS]etDefaults_)|exported: exported function (Convert|SetDefaults)_.* should be of the form)"

      # The generated swagger docs also don't follow the naming convention.
      - linters:
          - staticcheck
        text: "ST1003: should not use underscores in Go names"
        path: types_swagger_doc_generated.go$

      {{- if .Hints}}

      - path: (.+)\.go$
        # staticcheck: Developers tend to write in C-style with an explicit 'break' in a 'switch', so it's ok to ignore
        text: ineffective break statement. Did you mean to break out of the outer loop

      # exclude ineffassign linter for generated files for conversion
      - path: conversion\.go
        linters:
          - ineffassign

      {{- end}}

      {{- if .Base}}

      # TODO(https://github.com/kubernetes/kubernetes/issues/131475): Remove these excluded directories and fix findings. Due to large amount of findings in different components
      # with different owners it's hard to fix everything in a single pr. This will therefore be done in multiple prs.
      - path: (pkg/volume/*|test/*|azure/*|pkg/cmd/wait*|request/bearertoken/*|metrics/*|filters/*)
        linters:
          - gocritic

      # Some of these seem legitimate, maybe better fix code (https://github.com/kubernetes/kubernetes/issues/130449).

      - linters:
          - govet
        text: "lostcancel"

      - linters:
          - ginkgolinter
        text: "wrong error assertion. Consider using `gomega.(Eventually|Consistently)|wrong comparison assertion|wrong length assertion"

      - linters:
          - gocritic
        text: "wrapperFunc: use strings.ReplaceAll|should rewrite switch statement to if statement"

    {{- end}}

      # Kube-API-Linter should only be run on the API definitions
      - linters:
        - kubeapilinter
        path-except: staging/src/k8s.io/api/.*
        
      {{include "hack/kube-api-linter/exceptions.yaml" | indent 6 | trim}}

      - linters:
        - forbidigo
        path: test/e2e/e2e_test\.go|test/e2e/framework/internal/.*|test/e2e/framework/[^/]*\.go|test/e2e/invariants/.*

  default: {{if .Base -}} none {{- else -}} standard {{- end}}
  enable: # please keep this alphabetized
    - depguard
    - forbidigo
    - ginkgolinter
    - gocritic
    - govet
    {{- if .Hints}}
    - errorlint
    {{- end}}
    - ineffassign
    - kubeapilinter
    - logcheck
    - modernize
    - revive
    - sorted
    - staticcheck
    - testifylint
    - unused
  {{- if not .Base }}
    - usestdlibvars
  {{- end }}

  settings: # please keep this alphabetized
    custom:
      logcheck:
        # Installed there by hack/verify-golangci-lint.sh.
        path: _output/local/bin/logcheck.so
        description: structured logging checker
        original-url: k8s.io/logtools/logcheck
        settings:
          config: |
            {{include "hack/logcheck.conf" | indent 12 | trim}}
      sorted:
        # Installed there by hack/verify-golangci-lint.sh.
        path: _output/local/bin/sorted.so
        description: check if feature gates are sorted
        original-url: k8s.io/kubernetes/hack/tools/golangci-lint/sorted
        settings:
          {{include "hack/tools/golangci-lint/sorted/config.yaml" | indent 10 | trim}}
      kubeapilinter:
        path: _output/local/bin/kube-api-linter.so
        description: kube-api-linter and lints Kube like APIs based on API conventions and best practices.
        original-url: sigs.k8s.io/kube-api-linter
        settings:
          {{include "hack/kube-api-linter/kube-api-linter.yaml" | indent 10 | trim}}
    depguard:
      rules:
        utils:
          files:
            - $all
          deny:
            - pkg: "k8s.io/utils/pointer"
              desc: "k8s.io/utils/pointer shall no longer be used, please use k8s.io/utils/ptr."
        go-cmp:
          files:
            - $all
            - "!$test"
            - "!**/test/**"
            - "!**/testing/**"
            - "!**/apitesting/**"
          deny:
            - pkg: "github.com/google/go-cmp/cmp"
              desc: "cmp is allowed only in test files"
            - pkg: "html/template"
              desc: "template is allowed only in test files as it disables dead code elimination"
    forbidigo:
      analyze-types: true
      forbid:
        - pattern: md5\.*
          # https://github.com/kubernetes/kubernetes/issues/129652
          msg: md5 is oudated, insecure, prefer a secure hash (such as sha256) or a non-cryptographic hash
        - pattern: ^managedfields\.ExtractInto$
          pkg: ^k8s\.io/apimachinery/pkg/util/managedfields$
          msg: should not be used because managedFields was removed
        - pattern: \.Extract
          pkg: ^k8s\.io/client-go/applyconfigurations/
          msg: should not be used because managedFields was removed
        - pattern: \.Add$
          pkg: ^k8s\.io/component-base/featuregate$         
          msg: should not use Add, use AddVersioned instead
        - pattern: \.(ReportBeforeSuite|ReportAfterSuite)
          pkg: ^github\.com/onsi/ginkgo/v2$
          msg: usage is restricted to code under control of SIG Testing
          # Exceptions are listed above under rules.
      {{- if .Hints}}
        - pattern: ^gomega\.BeTrue$
          pkg: ^github.com/onsi/gomega$
          msg: "it does not produce a good failure message - use BeTrueBecause with an explicit printf-style failure message instead, or plain Go: if ... { ginkgo.Fail(...) }"
        - pattern: ^gomega\.BeFalse$
          pkg: ^github.com/onsi/gomega$
          msg: "it does not produce a good failure message - use BeFalseBecause with an explicit printf-style failure message instead, or plain Go: if ... { ginkgo.Fail(...) }"        
      {{- end}}
      {{- if .Base }}
    gocritic:
      enabled-checks: # These are in addition to the default checks - see https://golangci-lint.run/docs/linters/configuration/#gocritic
        - boolExprSimplify
        - equalFold
      disabled-checks: # This disables checks that are enabled by default (this can be combined with enabled-checks, contrary to the docs)
        - appendAssign
        - assignOp # https://github.com/kubernetes/kubernetes/issues/117288#issuecomment-1507008918
        - captLocal
        - commentFormatting
        - deprecatedComment
        - elseif
        # The following have few (single-digit) occurrences left in k/k and wouldn't be too onerous to enable
        - exitAfterDefer
        - regexpMust
        - sloppyLen
        - typeSwitchVar
        - underef
        - unslice
    {{- end}}
    modernize:
      # List of analyzers to disable.
      # By default, all analyzers are enabled but in
      # Kubernetes we want to be more selective and
      # disable those which are not useful for it.
      disable:
        # Replace interface{} with any.
        - any
        # Replace for-range over b.N with b.Loop.
        - bloop
        # Replace []byte(fmt.Sprintf) with fmt.Appendf.
        - fmtappendf
        # Remove redundant re-declaration of loop variables.
        - forvar
        # Replace explicit loops over maps with calls to maps package.
        - mapsloop
        # Replace if/else statements with calls to min or max.
        - minmax
        # Suggest replacing omitempty with omitzero for struct fields.
        - omitzero
        # Replace 3-clause for loops with for-range over integers.
        - rangeint
        # Replace reflect.TypeOf(x) with TypeFor[T]().
        - reflecttypefor
        # Replace loops with slices.Contains or slices.ContainsFunc.
        - slicescontains
        # Replace sort.Slice with slices.Sort for basic types.
        - slicessort
        # Use iterators instead of Len/At-style APIs.
        - stditerators
        # Replace HasPrefix/TrimPrefix with CutPrefix.
        - stringscutprefix
        # Replace ranging over Split/Fields with SplitSeq/FieldsSeq.
        - stringsseq
        # Replace += with strings.Builder.
        - stringsbuilder
        # Replace context.WithCancel with t.Context in tests.
        - testingcontext
        # Replace wg.Add(1)/go/wg.Done() with wg.Go.
        - waitgroup

    revive:
      # Only these rules are enabled.
      rules:
        - name: exported
          arguments:
            - disableStutteringCheck
    staticcheck:
      checks:
        - "all"
        - "-QF1008"  # Omit embedded fields from selector expression
        {{- if .Base }}
        - "-QF1001"  # Apply De Morgan’s law
        - "-QF1002"  # Convert untagged switch to tagged switch
        - "-QF1003"  # Convert if/else-if chain to tagged switch
        - "-QF1004"  # Use strings.ReplaceAll instead of strings.Replace with n == -1
        - "-QF1006"  # Lift if+break into loop condition
        - "-QF1007"  # Merge conditional assignment into variable declaration
        - "-QF1008"  # Omit embedded fields from selector expression
        - "-QF1009"  # Use time.Time.Equal instead of == operator
        - "-QF1011"  # Omit redundant type from variable declaration
        - "-QF1012"  # Use fmt.Fprintf(x, ...) instead of x.Write(fmt.Sprintf(...))
        - "-S1000"   # Use plain channel send or receive instead of single-case select
        - "-S1002"   # Omit comparison with boolean constant
        - "-S1003"   # Replace call to strings.Index with strings.Contains
        - "-S1004"   # Replace call to bytes.Compare with bytes.Equal
        - "-S1005"   # Drop unnecessary use of the blank identifier
        - "-S1006"   # Use for { ... } for infinite loops
        - "-S1007"   # Simplify regular expression by using raw string literal
        - "-S1008"   # Simplify returning boolean expression
        - "-S1009"   # Omit redundant nil check on slices, maps, and channels
        - "-S1011"   # Use a single append to concatenate two slices
        - "-S1012"   # Replace time.Now().Sub(x) with time.Since(x)
        - "-S1016"   # Use a type conversion instead of manually copying struct fields
        - "-S1017"   # Replace manual trimming with strings.TrimPrefix
        - "-S1019"   # Simplify make call by omitting redundant arguments
        - "-S1021"   # Merge variable declaration and assignment
        - "-S1023"   # Omit redundant control flow
        - "-S1024"   # Replace x.Sub(time.Now()) with time.Until(x)
        - "-S1025"   # Don’t use fmt.Sprintf("%s", x) unnecessarily
        - "-S1028"   # Simplify error construction with fmt.Errorf
        - "-S1030"   # Use bytes.Buffer.String or bytes.Buffer.Bytes
        - "-S1034"   # Use result of type assertion to simplify cases
        - "-S1036"   # Unnecessary guard around map access
        - "-S1038"   # Unnecessarily complex way of printing formatted string
        - "-S1039"   # Unnecessary use of fmt.Sprint
        - "-S1040"   # Type assertion to current type
        - "-SA1006"  # Printf with dynamic first argument and no further arguments
        - "-SA1019"  # Using a deprecated function, variable, constant or field
        - "-SA2002"  # Called testing.T.FailNow or SkipNow in a goroutine, which isn’t allowed
        - "-SA4006"  # A value assigned to a variable is never read before being overwritten. Forgotten error check or dead code?
        - "-SA4011"  # ineffective break statement. Did you mean to break out of the outer loop?
        - "-ST1000"  # Incorrect or missing package comment
        - "-ST1001"  # Dot imports are discouraged
        - "-ST1003"  # Poorly chosen identifier
        - "-ST1005"  # Incorrectly formatted error string
        - "-ST1006"  # Poorly chosen receiver name
        - "-ST1008"  # A function’s error value should be its last return value
        - "-ST1011"  # Poorly chosen name for variable of type time.Duration
        - "-ST1012"  # Poorly chosen name for error variable
        - "-ST1013"  # Should use constants for HTTP error codes, not magic numbers
        - "-ST1016"  # Use consistent method receiver names
        - "-ST1017"  # Don’t use Yoda conditions
        - "-ST1020"  # The documentation of an exported function should start with the function’s name
        - "-ST1023"  # Redundant type in variable declaration
        {{- end}}
    testifylint:
      enable-all: true
      {{- if not .Hints }}
      disable:
        {{- if .Base }}
        - empty
        - encoded-compare
        - equal-values
        - error-nil
        - expected-actual
        - float-compare
        - formatter
        - len
        - useless-assert
        {{- end}}
        - require-error
      {{- end}}