feat: Gator sync test support (#3098)

Signed-off-by: Anlan Du <adu47249@gmail.com>
Co-authored-by: alex <8968914+acpana@users.noreply.github.com>
Co-authored-by: Sertaç Özercan <852750+sozercan@users.noreply.github.com>
Co-authored-by: Rita Zhang <rita.z.zhang@gmail.com>
Signed-off-by: Wyatt Fry <wyattfry@gmail.com>

Makefile

@@ -363,7 +363,7 @@ generate: __conversion-gen __controller-gen
 	$(CONTROLLER_GEN) object:headerFile=./hack/boilerplate.go.txt paths="./apis/..." paths="./pkg/..."
 	$(CONVERSION_GEN) \
 		--output-base=/gatekeeper \
-		--input-dirs=./apis/mutations/v1,./apis/mutations/v1beta1,./apis/mutations/v1alpha1,./apis/expansion/v1alpha1,./apis/syncset/v1alpha1 \
+		--input-dirs=./apis/mutations/v1,./apis/mutations/v1beta1,./apis/mutations/v1alpha1,./apis/expansion/v1alpha1,./apis/syncset/v1alpha1,./apis/gvkmanifest/v1alpha1 \
 		--go-header-file=./hack/boilerplate.go.txt \
 		--output-file-base=zz_generated.conversion
 

apis/addtoscheme_gvkmanifest.go

@@ -0,0 +1,10 @@
+package apis
+
+import (
+	"github.com/open-policy-agent/gatekeeper/v3/apis/gvkmanifest/v1alpha1"
+)
+
+func init() {
+	// Register the types with the Scheme so the components can map objects to GroupVersionKinds and back
+	AddToSchemes = append(AddToSchemes, v1alpha1.AddToScheme)
+}

apis/gvkmanifest/v1alpha1/groupversion_info.go

@@ -0,0 +1,20 @@
+// Package v1alpha1 contains API Schema definitions for the GVKManifest v1alpha1 API group
+// +kubebuilder:object:generate=true
+// +groupName=gvkmanifest.gatekeeper.sh
+package v1alpha1
+
+import (
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"sigs.k8s.io/controller-runtime/pkg/scheme"
+)
+
+var (
+	// GroupVersion is group version used to register these objects.
+	GroupVersion = schema.GroupVersion{Group: "gvkmanifest.gatekeeper.sh", Version: "v1alpha1"}
+
+	// SchemeBuilder is used to add go types to the GroupVersionKind scheme.
+	SchemeBuilder = &scheme.Builder{GroupVersion: GroupVersion}
+
+	// AddToScheme adds the types in this group-version to the given scheme.
+	AddToScheme = SchemeBuilder.AddToScheme
+)

apis/gvkmanifest/v1alpha1/gvkmanifest_types.go

@@ -0,0 +1,42 @@
+package v1alpha1
+
+import (
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+type GVKManifestSpec struct {
+	Groups map[string]Versions `json:"groups,omitempty"`
+}
+
+type Versions map[string]Kinds
+
+type Kinds []string
+
+type Version struct {
+	Name  string   `json:"name,omitempty"`
+	Kinds []string `json:"kinds,omitempty"`
+}
+
+// +kubebuilder:resource:scope=Cluster
+// +kubebuilder:object:root=true
+
+// GVKManifest is the Schema for the GVKManifest API.
+type GVKManifest struct {
+	metav1.TypeMeta   `json:",inline"`
+	metav1.ObjectMeta `json:"metadata,omitempty"`
+
+	Spec GVKManifestSpec `json:"spec,omitempty"`
+}
+
+// +kubebuilder:object:root=true
+
+// GVKManifestList contains a list of GVKManifests.
+type GVKManifestList struct {
+	metav1.TypeMeta `json:",inline"`
+	metav1.ListMeta `json:"metadata,omitempty"`
+	Items           []GVKManifest `json:"items"`
+}
+
+func init() {
+	SchemeBuilder.Register(&GVKManifest{}, &GVKManifestList{})
+}

cmd/gator/gator.go

@@ -4,6 +4,7 @@ import (
 	"os"
 
 	"github.com/open-policy-agent/gatekeeper/v3/cmd/gator/expand"
+	"github.com/open-policy-agent/gatekeeper/v3/cmd/gator/sync"
 	"github.com/open-policy-agent/gatekeeper/v3/cmd/gator/test"
 	"github.com/open-policy-agent/gatekeeper/v3/cmd/gator/verify"
 	"github.com/open-policy-agent/gatekeeper/v3/pkg/version"
@@ -15,6 +16,7 @@ var commands = []*cobra.Command{
 	verify.Cmd,
 	test.Cmd,
 	expand.Cmd,
+	sync.Cmd,
 	k8sVersion.WithFont("alligator2"),
 }
 

cmd/gator/sync/sync.go

@@ -0,0 +1,24 @@
+package sync
+
+import (
+	"fmt"
+
+	synctest "github.com/open-policy-agent/gatekeeper/v3/cmd/gator/sync/test"
+	"github.com/spf13/cobra"
+)
+
+var commands = []*cobra.Command{
+	synctest.Cmd,
+}
+
+var Cmd = &cobra.Command{
+	Use:   "sync",
+	Short: "Manage SyncSets and Config",
+	Run: func(_ *cobra.Command, _ []string) {
+		fmt.Println("Usage: gator sync test")
+	},
+}
+
+func init() {
+	Cmd.AddCommand(commands...)
+}

cmd/gator/sync/test/test.go

@@ -0,0 +1,73 @@
+package test
+
+import (
+	"fmt"
+	"os"
+	"strings"
+
+	cmdutils "github.com/open-policy-agent/gatekeeper/v3/cmd/gator/util"
+	"github.com/open-policy-agent/gatekeeper/v3/pkg/gator/reader"
+	"github.com/open-policy-agent/gatekeeper/v3/pkg/gator/sync/test"
+	"github.com/spf13/cobra"
+)
+
+var Cmd = &cobra.Command{
+	Use:   "test",
+	Short: "Test that the provided SyncSet(s) and/or Config contain the GVKs required by the input templates.",
+	Run:   run,
+}
+
+var (
+	flagFilenames       []string
+	flagImages          []string
+	flagOmitGVKManifest bool
+	flagTempDir         string
+)
+
+const (
+	flagNameFilename = "filename"
+	flagNameImage    = "image"
+	flagNameForce    = "force-omit-gvk-manifest"
+	flagNameTempDir  = "tempdir"
+)
+
+func init() {
+	Cmd.Flags().StringArrayVarP(&flagFilenames, flagNameFilename, "n", []string{}, "a file or directory containing Kubernetes resources. Can be specified multiple times.")
+	Cmd.Flags().StringArrayVarP(&flagImages, flagNameImage, "i", []string{}, "a URL to an OCI image containing policies. Can be specified multiple times.")
+	Cmd.Flags().BoolVarP(&flagOmitGVKManifest, flagNameForce, "f", false, "Do not require a GVK manifest; if one is not provided, assume all GVKs listed in the requirements "+
+		"and configs are supported by the cluster under test. If this assumption isn't true, the given config may cause errors or templates may not be enforced correctly even after passing this test.")
+	Cmd.Flags().StringVarP(&flagTempDir, flagNameTempDir, "d", "", fmt.Sprintf("Specifies the temporary directory to download and unpack images to, if using the --%s flag. Optional.", flagNameImage))
+}
+
+func run(_ *cobra.Command, _ []string) {
+	unstrucs, err := reader.ReadSources(flagFilenames, flagImages, flagTempDir)
+	if err != nil {
+		cmdutils.ErrFatalf("reading: %v", err)
+	}
+	if len(unstrucs) == 0 {
+		cmdutils.ErrFatalf("no input data identified")
+	}
+
+	missingRequirements, templateErrors, err := test.Test(unstrucs, flagOmitGVKManifest)
+	if err != nil {
+		cmdutils.ErrFatalf("checking: %v", err)
+	}
+
+	if len(missingRequirements) > 0 {
+		cmdutils.ErrFatalf("the following requirements were not met: \n%v", resultsToString(missingRequirements))
+	}
+
+	if len(templateErrors) > 0 {
+		cmdutils.ErrFatalf("encountered errors parsing the following templates: \n%v", resultsToString(templateErrors))
+	}
+
+	os.Exit(0)
+}
+
+func resultsToString[T any](results map[string]T) string {
+	var sb strings.Builder
+	for template, vals := range results {
+		sb.WriteString(fmt.Sprintf("%s:\n%v\n", template, vals))
+	}
+	return sb.String()
+}