Linter to ensure go-cmp/cmp is used ONLY in tests

Signed-off-by: Davanum Srinivas <davanum@gmail.com>

cmd/dependencyverifier/dependencyverifier.go

@@ -26,7 +26,7 @@ import (
 	"sort"
 	"strings"
 
-	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp" //nolint:depguard
 )
 
 type Unwanted struct {

hack/golangci-hints.yaml

@@ -91,6 +91,7 @@ issues:
 linters:
   disable-all: false
   enable: # please keep this alphabetized
+    - depguard
     - forbidigo
     - ginkgolinter
     - gocritic
@@ -176,6 +177,16 @@ linters-settings: # please keep this alphabetized
           # this restriction. Whether we then do a global search/replace remains
           # to be decided.
           with-helpers .*
+  depguard:
+    rules:
+      main:
+        files:
+          - $all
+          - "!$test"
+          - "!**/test/**"
+        deny:
+          - pkg: "github.com/google/go-cmp/cmp"
+            desc: "cmp is allowed only in test files"
   forbidigo:
     analyze-types: true
     forbid:

hack/golangci-strict.yaml

@@ -135,6 +135,7 @@ issues:
 linters:
   disable-all: false
   enable: # please keep this alphabetized
+    - depguard
     - forbidigo
     - ginkgolinter
     - gocritic
@@ -222,6 +223,16 @@ linters-settings: # please keep this alphabetized
           # this restriction. Whether we then do a global search/replace remains
           # to be decided.
           with-helpers .*
+  depguard:
+    rules:
+      main:
+        files:
+          - $all
+          - "!$test"
+          - "!**/test/**"
+        deny:
+          - pkg: "github.com/google/go-cmp/cmp"
+            desc: "cmp is allowed only in test files"
   forbidigo:
     analyze-types: true
     forbid:

hack/golangci.yaml

@@ -141,6 +141,7 @@ issues:
 linters:
   disable-all: true
   enable: # please keep this alphabetized
+    - depguard
     - forbidigo
     - ginkgolinter
     - gocritic
@@ -224,6 +225,16 @@ linters-settings: # please keep this alphabetized
           # this restriction. Whether we then do a global search/replace remains
           # to be decided.
           with-helpers .*
+  depguard:
+    rules:
+      main:
+        files:
+          - $all
+          - "!$test"
+          - "!**/test/**"
+        deny:
+          - pkg: "github.com/google/go-cmp/cmp"
+            desc: "cmp is allowed only in test files"
   forbidigo:
     analyze-types: true
     forbid:

hack/golangci.yaml.in

@@ -147,6 +147,7 @@ issues:
 linters:
   disable-all: {{if .Base -}} true {{- else -}} false {{- end}}
   enable: # please keep this alphabetized
+    - depguard
     - forbidigo
     - ginkgolinter
     - gocritic
@@ -180,6 +181,16 @@ linters-settings: # please keep this alphabetized
       settings:
         config: |
           {{include "hack/logcheck.conf" | indent 10 | trim}}
+  depguard:
+    rules:
+      main:
+        files:
+          - $all
+          - "!$test"
+          - "!**/test/**"
+        deny:
+          - pkg: "github.com/google/go-cmp/cmp"
+            desc: "cmp is allowed only in test files"
   forbidigo:
     analyze-types: true
     forbid:

pkg/api/pod/util.go

@@ -19,7 +19,7 @@ package pod
 import (
 	"strings"
 
-	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp" //nolint:depguard
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	metavalidation "k8s.io/apimachinery/pkg/apis/meta/v1/validation"
 	"k8s.io/apimachinery/pkg/util/sets"

pkg/apis/certificates/validation/validation.go

@@ -22,7 +22,7 @@ import (
 	"encoding/pem"
 	"fmt"
 
-	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp" //nolint:depguard
 	v1 "k8s.io/api/core/v1"
 	apiequality "k8s.io/apimachinery/pkg/api/equality"
 	"k8s.io/apimachinery/pkg/util/sets"

pkg/apis/core/validation/validation.go

@@ -30,7 +30,7 @@ import (
 	"unicode"
 	"unicode/utf8"
 
-	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp" //nolint:depguard
 	netutils "k8s.io/utils/net"
 
 	v1 "k8s.io/api/core/v1"

pkg/controller/volume/persistentvolume/testing/testing.go

@@ -24,7 +24,7 @@ import (
 	"strconv"
 	"sync"
 
-	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp" //nolint:depguard
 	"k8s.io/klog/v2"
 
 	v1 "k8s.io/api/core/v1"

pkg/kubelet/status/status_manager.go

@@ -25,7 +25,7 @@ import (
 	"sync"
 	"time"
 
-	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp" //nolint:depguard
 	clientset "k8s.io/client-go/kubernetes"
 
 	v1 "k8s.io/api/core/v1"

pkg/registry/flowcontrol/ensurer/strategy.go

@@ -21,7 +21,7 @@ import (
 	"fmt"
 	"strconv"
 
-	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp" //nolint:depguard
 	flowcontrolv1 "k8s.io/api/flowcontrol/v1"
 	apierrors "k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"

pkg/scheduler/framework/interface.go

@@ -26,8 +26,8 @@ import (
 	"sync"
 	"time"
 
-	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp"         //nolint:depguard
-	"github.com/google/go-cmp/cmp/cmpopts"
+	"github.com/google/go-cmp/cmp/cmpopts" //nolint:depguard
 
 	v1 "k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/types"

pkg/scheduler/framework/plugins/dynamicresources/dynamicresources.go

@@ -23,7 +23,7 @@ import (
 	"slices"
 	"sync"
 
-	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp" //nolint:depguard
 
 	v1 "k8s.io/api/core/v1"
 	resourceapi "k8s.io/api/resource/v1beta1"

pkg/scheduler/framework/plugins/noderesources/fit.go

@@ -21,7 +21,7 @@ import (
 	"fmt"
 	"strings"
 
-	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp" //nolint:depguard
 
 	v1 "k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/runtime"

pkg/scheduler/framework/plugins/noderesources/test_util.go

@@ -17,7 +17,7 @@ limitations under the License.
 package noderesources
 
 import (
-	"github.com/google/go-cmp/cmp/cmpopts"
+	"github.com/google/go-cmp/cmp/cmpopts" //nolint:depguard
 
 	v1 "k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/api/resource"

pkg/scheduler/profile/profile.go

@@ -22,7 +22,7 @@ import (
 	"errors"
 	"fmt"
 
-	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp" //nolint:depguard
 
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/client-go/kubernetes/scheme"

plugin/pkg/admission/noderestriction/admission.go

@@ -23,7 +23,7 @@ import (
 	"io"
 	"strings"
 
-	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp" //nolint:depguard
 
 	v1 "k8s.io/api/core/v1"
 	apiequality "k8s.io/apimachinery/pkg/api/equality"

staging/src/k8s.io/apimachinery/pkg/api/apitesting/roundtrip/compatibility.go

@@ -28,7 +28,7 @@ import (
 	"strings"
 	"testing"
 
-	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp" //nolint:depguard
 
 	apiequality "k8s.io/apimachinery/pkg/api/equality"
 	"k8s.io/apimachinery/pkg/runtime"

staging/src/k8s.io/apimachinery/pkg/api/apitesting/roundtrip/roundtrip.go

@@ -24,7 +24,7 @@ import (
 	"strings"
 	"testing"
 
-	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp" //nolint:depguard
 	fuzz "github.com/google/gofuzz"
 	flag "github.com/spf13/pflag"
 

staging/src/k8s.io/apimachinery/pkg/api/apitesting/roundtrip/unstructured.go

@@ -37,7 +37,7 @@ import (
 	jsonserializer "k8s.io/apimachinery/pkg/runtime/serializer/json"
 	"k8s.io/apimachinery/pkg/util/sets"
 
-	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp" //nolint:depguard
 )
 
 // RoundtripToUnstructured verifies the roundtrip faithfulness of all external types in a scheme

staging/src/k8s.io/apimachinery/pkg/util/diff/diff.go

@@ -23,7 +23,7 @@ import (
 	"strings"
 	"text/tabwriter"
 
-	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp" //nolint:depguard
 	"k8s.io/apimachinery/pkg/util/dump"
 )
 

staging/src/k8s.io/apiserver/pkg/admission/testing/helpers.go

@@ -21,7 +21,7 @@ import (
 	"reflect"
 	"testing"
 
-	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp" //nolint:depguard
 	apiequality "k8s.io/apimachinery/pkg/api/equality"
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apiserver/pkg/admission"

staging/src/k8s.io/apiserver/pkg/endpoints/discovery/aggregated/fake.go

@@ -25,7 +25,7 @@ import (
 	"time"
 
 	"github.com/emicklei/go-restful/v3"
-	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp" //nolint:depguard
 	apidiscoveryv2 "k8s.io/api/apidiscovery/v2"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/util/wait"

staging/src/k8s.io/apiserver/pkg/storage/testing/store_tests.go

@@ -28,7 +28,7 @@ import (
 	"sync"
 	"testing"
 
-	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp" //nolint:depguard
 	apierrors "k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/fields"

staging/src/k8s.io/apiserver/pkg/storage/testing/utils.go

@@ -27,7 +27,7 @@ import (
 	"testing"
 	"time"
 
-	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp" //nolint:depguard
 	"k8s.io/apimachinery/pkg/api/meta"
 	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/fields"

staging/src/k8s.io/apiserver/pkg/util/flowcontrol/apf_controller.go

@@ -28,7 +28,7 @@ import (
 	"sync"
 	"time"
 
-	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp" //nolint:depguard
 	apiequality "k8s.io/apimachinery/pkg/api/equality"
 	apierrors "k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"

staging/src/k8s.io/client-go/util/consistencydetector/data_consistency_detector.go

@@ -22,7 +22,7 @@ import (
 	"sort"
 	"time"
 
-	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp" //nolint:depguard
 
 	"k8s.io/apimachinery/pkg/api/meta"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"

staging/src/k8s.io/component-base/config/testing/helpers.go

@@ -23,7 +23,7 @@ import (
 	"path/filepath"
 	"testing"
 
-	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp" //nolint:depguard
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/runtime/schema"
 	"k8s.io/apimachinery/pkg/runtime/serializer"

staging/src/k8s.io/component-base/config/testing/roundtrip.go

@@ -22,7 +22,7 @@ import (
 	"path/filepath"
 	"testing"
 
-	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp" //nolint:depguard
 	apiequality "k8s.io/apimachinery/pkg/api/equality"
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/runtime/schema"

staging/src/k8s.io/component-base/logs/api/v1/options.go

@@ -27,7 +27,7 @@ import (
 	"sync/atomic"
 	"time"
 
-	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp" //nolint:depguard
 	"github.com/spf13/pflag"
 
 	"k8s.io/klog/v2"

staging/src/k8s.io/dynamic-resource-allocation/resourceslice/resourceslicecontroller.go

@@ -24,7 +24,7 @@ import (
 	"sync/atomic"
 	"time"
 
-	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp" //nolint:depguard
 
 	v1 "k8s.io/api/core/v1"
 	resourceapi "k8s.io/api/resource/v1beta1"