.golangci.yml

linters:
  enable:
    - asasalint     # Detects "[]any" used as argument for variadic "func(...any)".
    - copyloopvar   # Detects places where loop variables are copied.
    - depguard
    - dogsled       # Detects assignments with too many blank identifiers.
    - dupword       # Detects duplicate words.
    - durationcheck # Detect cases where two time.Duration values are being multiplied in possibly erroneous ways.
    - errchkjson    # Detects unsupported types passed to json encoding functions and reports if checks for the returned error can be omitted.
    - exhaustive    # Detects missing options in enum switch statements.
    - exptostd      # Detects functions from golang.org/x/exp/ that can be replaced by std functions.
    - fatcontext    # Detects nested contexts in loops and function literals.
    - gocheckcompilerdirectives # Detects invalid go compiler directive comments (//go:).
    - goimports
    - gosec         # Detects security problems.
    - gosimple
    - govet
    - forbidigo
    - iface         # Detects incorrect use of interfaces. Currently only used for "identical" interfaces in the same package.
    - importas
    - ineffassign
    - makezero      # Finds slice declarations with non-zero initial length.
    - mirror        # Detects wrong mirror patterns of bytes/strings usage.
    - misspell      # Detects commonly misspelled English words in comments.
    - nilnesserr    # Detects returning nil errors. It combines the features of nilness and nilerr,
    - nosprintfhostport # Detects misuse of Sprintf to construct a host with port in a URL.
    - reassign      # Detects reassigning a top-level variable in another package.
    - revive        # Metalinter; drop-in replacement for golint.
    - spancheck     # Detects mistakes with OpenTelemetry/Census spans.
    - staticcheck
    - typecheck
    - unconvert     # Detects unnecessary type conversions.
    - unused
    - wastedassign  # Detects wasted assignment statements.

  disable:
    - errcheck

run:
  # prevent golangci-lint from deducting the go version to lint for through go.mod,
  # which causes it to fallback to go1.17 semantics.
  go: "1.23.6"
  concurrency: 2
  # Only supported with go modules enabled (build flag -mod=vendor only valid when using modules)
  # modules-download-mode: vendor

linters-settings:
  depguard:
    rules:
      main:
        deny:
          - pkg: io/ioutil
            desc: The io/ioutil package has been deprecated, see https://go.dev/doc/go1.16#ioutil
          - pkg: "github.com/stretchr/testify/assert"
            desc: Use "gotest.tools/v3/assert" instead
          - pkg: "github.com/stretchr/testify/require"
            desc: Use "gotest.tools/v3/assert" instead
          - pkg: "github.com/stretchr/testify/suite"
            desc: Do not use
          - pkg: "github.com/containerd/containerd/errdefs"
            desc: The errdefs package has moved to a separate module, https://github.com/containerd/errdefs
          - pkg: "github.com/containerd/containerd/log"
            desc: The logs package has moved to a separate module, https://github.com/containerd/log
          - pkg: "github.com/containerd/containerd/pkg/userns"
            desc: Use github.com/moby/sys/userns instead.
          - pkg: "github.com/tonistiigi/fsutil"
            desc: The fsutil module does not have a stable API, so we should not have a direct dependency unless necessary.

  dupword:
    ignore:
      - "true"    # some tests use this as expected output
      - "false"   # some tests use this as expected output
      - "root"    # for tests using "ls" output with files owned by "root:root"

  exhaustive:
    # Program elements to check for exhaustiveness.
    # Default: [ switch ]
    check:
      - switch
      # - map # TODO(thaJeztah): also enable for maps
    # Presence of "default" case in switch statements satisfies exhaustiveness,
    # even if all enum members are not listed.
    # Default: false
    #
    # TODO(thaJeztah): consider not allowing this to catch new values being added (and falling through to "default")
    default-signifies-exhaustive: true

  forbidigo:
    forbid:
      - pkg: ^sync/atomic$
        p: ^atomic\.(Add|CompareAndSwap|Load|Store|Swap).
        msg: Go 1.19 atomic types should be used instead.
      - pkg: ^regexp$
        p: ^regexp\.MustCompile
        msg: Use internal/lazyregexp.New instead.
      - pkg: github.com/vishvananda/netlink$
        p: ^netlink\.(Handle\.)?(AddrList|BridgeVlanList|ChainList|ClassList|ConntrackTableList|ConntrackDeleteFilter$|ConntrackDeleteFilters|DevLinkGetDeviceList|DevLinkGetAllPortList|DevlinkGetDeviceParams|FilterList|FouList|GenlFamilyList|GTPPDPList|LinkByName|LinkByAlias|LinkList|LinkSubscribeWithOptions|NeighList$|NeighProxyList|NeighListExecute|NeighSubscribeWithOptions|LinkGetProtinfo|QdiscList|RdmaLinkList|RdmaLinkByName|RdmaLinkDel|RouteList|RouteListFilteredIter|RuleListFiltered$|RouteSubscribeWithOptions|RuleList$|RuleListFiltered|SocketGet|SocketDiagTCPInfo|SocketDiagTCP|SocketDiagUDPInfo|SocketDiagUDP|UnixSocketDiagInfo|UnixSocketDiag|VDPAGetDevConfigList|VDPAGetDevList|VDPAGetMGMTDevList|XfrmPolicyList|XfrmStateList)
        msg: Use internal nlwrap package for EINTR handling.
      - pkg: github.com/docker/docker/internal/nlwrap$
        p: ^nlwrap.Handle.(BridgeVlanList|ChainList|ClassList|ConntrackDeleteFilter$|DevLinkGetDeviceList|DevLinkGetAllPortList|DevlinkGetDeviceParams|FilterList|FouList|GenlFamilyList|GTPPDPList|LinkByAlias|LinkSubscribeWithOptions|NeighList$|NeighProxyList|NeighListExecute|NeighSubscribeWithOptions|LinkGetProtinfo|QdiscList|RdmaLinkList|RdmaLinkByName|RdmaLinkDel|RouteListFilteredIter|RuleListFiltered$|RouteSubscribeWithOptions|RuleList$|RuleListFiltered|SocketGet|SocketDiagTCPInfo|SocketDiagTCP|SocketDiagUDPInfo|SocketDiagUDP|UnixSocketDiagInfo|UnixSocketDiag|VDPAGetDevConfigList|VDPAGetDevList|VDPAGetMGMTDevList)
        msg: Add a wrapper to nlwrap.Handle for EINTR handling and update the list in .golangci.yml.
    analyze-types: true

  gosec:
    excludes:
      - G104 # G104: Errors unhandled; (TODO: reduce unhandled errors, or explicitly ignore)
      - G113 # G113: Potential uncontrolled memory consumption in Rat.SetString (CVE-2022-23772); (only affects go < 1.16.14. and go < 1.17.7)
      - G115 # G115: integer overflow conversion; (TODO: verify these: https://github.com/moby/moby/issues/48358)
      - G204 # G204: Subprocess launched with variable; too many false positives.
      - G301 # G301: Expect directory permissions to be 0750 or less (also EXC0009); too restrictive
      - G302 # G302: Expect file permissions to be 0600 or less (also EXC0009); too restrictive
      - G304 # G304: Potential file inclusion via variable.
      - G306 # G306: Expect WriteFile permissions to be 0600 or less (too restrictive; also flags "0o644" permissions)
      - G307 # G307: Deferring unsafe method "*os.File" on type "Close" (also EXC0008); (TODO: evaluate these and fix where needed: G307: Deferring unsafe method "*os.File" on type "Close")
      - G504 # G504: Blocklisted import net/http/cgi: Go versions < 1.6.3 are vulnerable to Httpoxy attack: (CVE-2016-5386); (only affects go < 1.6.3)

  govet:
    enable-all: true
    disable:
      - fieldalignment # TODO: evaluate which ones should be updated.

  importas:
    # Do not allow unaliased imports of aliased packages.
    no-unaliased: true

    alias:
      # Enforce alias to prevent it accidentally being used instead of our
      # own errdefs package (or vice-versa).
      - pkg: github.com/containerd/errdefs
        alias: cerrdefs
      - pkg: github.com/containerd/containerd/images
        alias: c8dimages
      - pkg: github.com/opencontainers/image-spec/specs-go/v1
        alias: ocispec

  revive:
    rules:
      # FIXME make sure all packages have a description. Currently, there's many packages without.
      - name: package-comments
        disabled: true

  spancheck:
    # Default: ["end"]
    checks:
      - end             # check that `span.End()` is called
      - record-error    # check that `span.RecordError(err)` is called when an error is returned
      - set-status      # check that `span.SetStatus(codes.Error, msg)` is called when an error is returned

issues:
  # The default exclusion rules are a bit too permissive, so copying the relevant ones below
  exclude-use-default: false

  exclude-dirs:
    - docs

  exclude-rules:
    # We prefer to use an "exclude-list" so that new "default" exclusions are not
    # automatically inherited. We can decide whether or not to follow upstream
    # defaults when updating golang-ci-lint versions.
    # Unfortunately, this means we have to copy the whole exclusion pattern, as
    # (unlike the "include" option), the "exclude" option does not take exclusion
    # ID's.
    #
    # These exclusion patterns are copied from the default excludes at:
    # https://github.com/golangci/golangci-lint/blob/v1.61.0/pkg/config/issues.go#L11-L104
    #
    # The default list of exclusions can be found at:
    # https://golangci-lint.run/usage/false-positives/#default-exclusions

    # EXC0001
    - text: "Error return value of .((os\\.)?std(out|err)\\..*|.*Close|.*Flush|os\\.Remove(All)?|.*print(f|ln)?|os\\.(Un)?Setenv). is not checked"
      linters:
        - errcheck

    # Exclude some linters from running on tests files.
    - path: _test\.go
      linters:
        - errcheck

    - text: "G404: Use of weak random number generator"
      path: _test\.go
      linters:
        - gosec

    # Suppress golint complaining about generated types in api/types/
    - text: "type name will be used as (container|volume)\\.(Container|Volume).* by other packages, and that stutters; consider calling this"
      path: "api/types/(volume|container)/"
      linters:
        - revive

    # FIXME: ignoring unused assigns to ctx for now; too many hits in libnetwork/xxx functions that setup traces
    - text: "assigned to ctx, but never used afterwards"
      linters:
        - wastedassign

    - text: "ineffectual assignment to ctx"
      source: "ctx[, ].*=.*\\(ctx[,)]"
      linters:
        - ineffassign

    - text: "SA4006: this value of `ctx` is never used"
      source: "ctx[, ].*=.*\\(ctx[,)]"
      linters:
        - staticcheck

    # Ignore "nested context in function literal (fatcontext)" as we intentionally set up tracing on a base-context for tests.
    # FIXME(thaJeztah): see if there's a more iodiomatic way to do this.
    - text: 'nested context in function literal'
      path: '((main|check)_(linux_|)test\.go)|testutil/helpers\.go'
      linters:
        - fatcontext

    - text: '^shadow: declaration of "(ctx|err|ok)" shadows declaration'
      linters:
        - govet
    - text: '^shadow: declaration of "(out)" shadows declaration'
      path: _test\.go
      linters:
        - govet
    - text: 'use of `regexp.MustCompile` forbidden'
      path: _test\.go
      linters:
        - forbidigo
    - text: 'use of `regexp.MustCompile` forbidden'
      path: "internal/lazyregexp"
      linters:
        - forbidigo
    - text: 'use of `regexp.MustCompile` forbidden'
      path: "libnetwork/cmd/networkdb-test/dbclient"
      linters:
        - forbidigo

  # 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