add openapi/path field to use custom openapi schema document

api/internal/target/kusttarget.go

@@ -6,6 +6,7 @@ package target
 import (
 	"encoding/json"
 	"fmt"
+	"path/filepath"
 	"strings"
 
 	"github.com/pkg/errors"
@@ -377,10 +378,17 @@ func (kt *KustTarget) accumulateDirectory(
 		return nil, errors.Wrapf(
 			err, "couldn't make target for path '%s'", ldr.Root())
 	}
-	err = openapi.SetSchemaVersion(subKt.Kustomization().OpenAPI, false)
+	var bytes []byte
+	path := ldr.Root()
+	if openApiPath, exists := subKt.Kustomization().OpenAPI["path"]; exists {
+		bytes, err = ldr.Load(filepath.Join(path, openApiPath))
+		if err != nil {
+			return nil, err
+		}
+	}
+	err = openapi.SetSchema(subKt.Kustomization().OpenAPI, bytes, false)
 	if err != nil {
-		return nil, errors.Wrapf(
-			err, "couldn't set openapi version for path '%s'", ldr.Root())
+		return nil, err
 	}
 	if isComponent && subKt.kustomization.Kind != types.ComponentKind {
 		return nil, fmt.Errorf(

api/krusty/kustomizer.go

@@ -5,6 +5,7 @@ package krusty
 
 import (
 	"fmt"
+	"path/filepath"
 
 	"sigs.k8s.io/kustomize/api/builtins"
 	"sigs.k8s.io/kustomize/api/filesys"
@@ -73,7 +74,14 @@ func (b *Kustomizer) Run(
 	if err != nil {
 		return nil, err
 	}
-	err = openapi.SetSchemaVersion(kt.Kustomization().OpenAPI, true)
+	var bytes []byte
+	if openApiPath, exists := kt.Kustomization().OpenAPI["path"]; exists {
+		bytes, err = ldr.Load(filepath.Join(ldr.Root(), openApiPath))
+		if err != nil {
+			return nil, err
+		}
+	}
+	err = openapi.SetSchema(kt.Kustomization().OpenAPI, bytes, true)
 	if err != nil {
 		return nil, err
 	}

api/krusty/openapicustomschema_test.go

@@ -0,0 +1,403 @@
+package krusty_test
+
+import (
+	"io/ioutil"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	kusttest_test "sigs.k8s.io/kustomize/api/testutils/kusttest"
+	"sigs.k8s.io/kustomize/kyaml/openapi"
+)
+
+func writeTestSchema(th kusttest_test.Harness, filepath string) {
+	bytes, _ := ioutil.ReadFile("testdata/customschema.json")
+	th.WriteF(filepath+"mycrd_schema.json", string(bytes))
+}
+
+func writeTestComponentWithCustomSchema(th kusttest_test.Harness) {
+	writeTestSchema(th, "/app/comp/")
+	openapi.ResetOpenAPI()
+	th.WriteC("/app/comp", `
+openapi:
+  path: mycrd_schema.json
+`)
+	th.WriteF("/app/comp/stub.yaml", `
+apiVersion: v1
+kind: Deployment
+metadata:
+  name: stub
+spec:
+  replicas: 1
+`)
+}
+
+// Test for issue #2825
+func TestCustomOpenApiFieldBasicUsage(t *testing.T) {
+	th := kusttest_test.MakeHarness(t)
+	th.WriteK("/app", `
+resources:
+- mycrd.yaml
+
+openapi:
+  path: mycrd_schema.json
+
+patchesStrategicMerge:
+- |-
+  apiVersion: example.com/v1alpha1
+  kind: MyCRD
+  metadata:
+    name: service
+  spec:
+    template:
+      spec:
+        containers:
+        - name: server
+          image: nginx
+`)
+	th.WriteF("/app/mycrd.yaml", `
+apiVersion: example.com/v1alpha1
+kind: MyCRD
+metadata:
+  name: service
+spec:
+  template:
+    spec:
+      containers:
+      - name: server
+        image: server
+        command: example
+        ports:
+        - name: grpc
+          protocol: TCP
+          containerPort: 8080
+`)
+	writeTestSchema(th, "/app/")
+	openapi.ResetOpenAPI()
+
+	m := th.Run("/app", th.MakeDefaultOptions())
+	th.AssertActualEqualsExpected(m, `
+apiVersion: example.com/v1alpha1
+kind: MyCRD
+metadata:
+  name: service
+spec:
+  template:
+    spec:
+      containers:
+      - command: example
+        image: nginx
+        name: server
+        ports:
+        - containerPort: 8080
+          name: grpc
+          protocol: TCP
+`)
+}
+
+// Error if user tries to specify both builtin version
+// and custom schema
+func TestCustomOpenApiFieldBothPathAndVersion(t *testing.T) {
+	th := kusttest_test.MakeHarness(t)
+	th.WriteK("/app", `
+resources:
+- mycrd.yaml
+
+openapi:
+  version: v1.18.8
+  path: mycrd_schema.json
+
+patchesStrategicMerge:
+- |-
+  apiVersion: example.com/v1alpha1
+  kind: MyCRD
+  metadata:
+    name: service
+  spec:
+    template:
+      spec:
+        containers:
+        - name: server
+          image: nginx
+`)
+	th.WriteF("/app/mycrd.yaml", `
+apiVersion: example.com/v1alpha1
+kind: MyCRD
+metadata:
+  name: service
+spec:
+  template:
+    spec:
+      containers:
+      - name: server
+        image: server
+        command: example
+        ports:
+        - name: grpc
+          protocol: TCP
+          containerPort: 8080
+`)
+	writeTestSchema(th, "/app/")
+	openapi.ResetOpenAPI()
+	err := th.RunWithErr("/app", th.MakeDefaultOptions())
+	assert.Error(t, err)
+	assert.Equal(t,
+		"builtin version and custom schema provided, cannot use both",
+		err.Error())
+}
+
+// Test for if the filepath specified is not found
+func TestCustomOpenApiFieldFileNotFound(t *testing.T) {
+	th := kusttest_test.MakeHarness(t)
+	th.WriteK("/app", `
+resources:
+- mycrd.yaml
+
+openapi:
+  path: mycrd_schema.json
+
+patchesStrategicMerge:
+- |-
+  apiVersion: example.com/v1alpha1
+  kind: MyCRD
+  metadata:
+    name: service
+  spec:
+    template:
+      spec:
+        containers:
+        - name: server
+          image: nginx
+`)
+	th.WriteF("/app/mycrd.yaml", `
+apiVersion: example.com/v1alpha1
+kind: MyCRD
+metadata:
+  name: service
+spec:
+  template:
+    spec:
+      containers:
+      - name: server
+        image: server
+        command: example
+        ports:
+        - name: grpc
+          protocol: TCP
+          containerPort: 8080
+`)
+	openapi.ResetOpenAPI()
+	err := th.RunWithErr("/app", th.MakeDefaultOptions())
+	assert.Error(t, err)
+	assert.Equal(t,
+		"'/app/mycrd_schema.json' doesn't exist",
+		err.Error())
+}
+
+func TestCustomOpenApiFieldFromBase(t *testing.T) {
+	th := kusttest_test.MakeHarness(t)
+	th.WriteK("base", `
+resources:
+- mycrd.yaml
+
+openapi:
+  path: mycrd_schema.json
+`)
+	th.WriteF("base/mycrd.yaml", `
+apiVersion: example.com/v1alpha1
+kind: MyCRD
+metadata:
+  name: service
+spec:
+  template:
+    spec:
+      containers:
+      - name: server
+        image: server
+        command: example
+        ports:
+        - name: grpc
+          protocol: TCP
+          containerPort: 8080
+`)
+	th.WriteK("overlay", `
+resources:
+- ../base
+
+patchesStrategicMerge:
+- |-
+  apiVersion: example.com/v1alpha1
+  kind: MyCRD
+  metadata:
+    name: service
+  spec:
+    template:
+      spec:
+        containers:
+        - name: server
+          image: nginx
+`)
+	writeTestSchema(th, "/base/")
+	openapi.ResetOpenAPI()
+	m := th.Run("overlay", th.MakeDefaultOptions())
+	th.AssertActualEqualsExpected(m, `
+apiVersion: example.com/v1alpha1
+kind: MyCRD
+metadata:
+  name: service
+spec:
+  template:
+    spec:
+      containers:
+      - command: example
+        image: nginx
+        name: server
+        ports:
+        - containerPort: 8080
+          name: grpc
+          protocol: TCP
+`)
+	assert.Equal(t, "using custom schema from file provided",
+		openapi.GetSchemaVersion())
+}
+
+func TestCustomOpenApiFieldFromOverlay(t *testing.T) {
+	th := kusttest_test.MakeHarness(t)
+	th.WriteK("base", `
+resources:
+- mycrd.yaml
+`)
+	th.WriteF("base/mycrd.yaml", `
+apiVersion: example.com/v1alpha1
+kind: MyCRD
+metadata:
+  name: service
+spec:
+  template:
+    spec:
+      containers:
+      - name: server
+        image: server
+        command: example
+        ports:
+        - name: grpc
+          protocol: TCP
+          containerPort: 8080
+`)
+	th.WriteK("overlay", `
+resources:
+- ../base
+openapi:
+  path: mycrd_schema.json
+patchesStrategicMerge:
+- |-
+  apiVersion: example.com/v1alpha1
+  kind: MyCRD
+  metadata:
+    name: service
+  spec:
+    template:
+      spec:
+        containers:
+        - name: server
+          image: nginx
+`)
+	writeTestSchema(th, "/overlay/")
+	openapi.ResetOpenAPI()
+	m := th.Run("overlay", th.MakeDefaultOptions())
+	th.AssertActualEqualsExpected(m, `
+apiVersion: example.com/v1alpha1
+kind: MyCRD
+metadata:
+  name: service
+spec:
+  template:
+    spec:
+      containers:
+      - command: example
+        image: nginx
+        name: server
+        ports:
+        - containerPort: 8080
+          name: grpc
+          protocol: TCP
+`)
+	assert.Equal(t, "using custom schema from file provided",
+		openapi.GetSchemaVersion())
+}
+
+func TestCustomOpenApiFieldOverlayTakesPrecedence(t *testing.T) {
+	th := kusttest_test.MakeHarness(t)
+	th.WriteK("base", `
+resources:
+- mycrd.yaml
+openapi:
+  path: mycrd_schema.json
+`)
+	th.WriteF("base/mycrd.yaml", `
+apiVersion: example.com/v1alpha1
+kind: MyCRD
+metadata:
+  name: service
+spec:
+  template:
+    spec:
+      containers:
+      - name: server
+        image: server
+        command: example
+        ports:
+        - name: grpc
+          protocol: TCP
+          containerPort: 8080
+`)
+	th.WriteK("overlay", `
+resources:
+- ../base
+openapi:
+  version: v1.19.1
+patchesStrategicMerge:
+- |-
+  apiVersion: example.com/v1alpha1
+  kind: MyCRD
+  metadata:
+    name: service
+  spec:
+    template:
+      spec:
+        containers:
+        - name: server
+          image: nginx
+`)
+	writeTestSchema(th, "/base/")
+	openapi.ResetOpenAPI()
+	m := th.Run("overlay", th.MakeDefaultOptions())
+	th.AssertActualEqualsExpected(m, `
+apiVersion: example.com/v1alpha1
+kind: MyCRD
+metadata:
+  name: service
+spec:
+  template:
+    spec:
+      containers:
+      - image: nginx
+        name: server
+`)
+	assert.Equal(t, "v1191",
+		openapi.GetSchemaVersion())
+}
+
+func TestCustomOpenAPIFieldFromComponent(t *testing.T) {
+	input := []FileGen{
+		writeTestBase,
+		writeTestComponentWithCustomSchema,
+		writeOverlayProd}
+
+	th := kusttest_test.MakeHarness(t)
+	for _, f := range input {
+		f(th)
+	}
+	openapi.ResetOpenAPI()
+	th.Run(runPath, th.MakeDefaultOptions())
+	assert.Equal(t, "using custom schema from file provided", openapi.GetSchemaVersion())
+}

api/krusty/openapiversion_test.go

@@ -285,12 +285,13 @@ spec:
 `)
 }
 
+const runPath = "/app/prod"
+
 func TestOpenAPIFieldFromComponent(t *testing.T) {
 	input := []FileGen{
 		writeTestBase,
 		writeTestComponentWithOlderOpenAPIVersion,
 		writeOverlayProd}
-	runPath := "/app/prod"
 
 	th := kusttest_test.MakeHarness(t)
 	for _, f := range input {

kyaml/openapi/openapi.go

@@ -24,6 +24,9 @@ var globalSchema openapiData
 // kubernetesOpenAPIVersion specifies which builtin kubernetes schema to use
 var kubernetesOpenAPIVersion string
 
+// customSchemaFile stores the custom OpenApi schema if it is provided
+var customSchema []byte
+
 // openapiData contains the parsed openapi state.  this is in a struct rather than
 // a list of vars so that it can be reset from tests.
 type openapiData struct {
@@ -363,25 +366,20 @@ func (rs *ResourceSchema) PatchStrategyAndKeyList() (string, []string) {
 		// empty patch strategy
 		return "", []string{}
 	}
-
 	mkList, found := rs.Schema.Extensions[kubernetesMergeKeyMapList]
 	if found {
 		// mkList is []interface, convert to []string
 		mkListStr := make([]string, len(mkList.([]interface{})))
-
 		for i, v := range mkList.([]interface{}) {
 			mkListStr[i] = v.(string)
 		}
-
 		return ps.(string), mkListStr
 	}
-
 	mk, found := rs.Schema.Extensions[kubernetesMergeKeyExtensionKey]
 	if !found {
 		// no mergeKey -- may be a primitive associative list (e.g. finalizers)
 		return ps.(string), []string{}
 	}
-
 	return ps.(string), []string{mk.(string)}
 }
 
@@ -434,45 +432,72 @@ const (
 	kindKey = "kind"
 )
 
-// SetSchemaVersion sets the kubernetes OpenAPI schema version to use
-func SetSchemaVersion(openAPIField map[string]string, reset bool) error {
+// SetSchema sets the kubernetes OpenAPI schema version to use
+func SetSchema(openAPIField map[string]string, schema []byte, reset bool) error {
 	// this should only be set once
-	if kubernetesOpenAPIVersion != "" && !reset {
+	schemaIsSet := (kubernetesOpenAPIVersion != "") || customSchema != nil
+	if schemaIsSet && !reset {
 		return nil
 	}
 
-	kubernetesOpenAPIVersion = strings.ReplaceAll(openAPIField["version"], ".", "")
+	version, exists := openAPIField["version"]
+	if exists && schema != nil {
+		return fmt.Errorf("builtin version and custom schema provided, cannot use both")
+	}
+
+	if schema != nil { // use custom schema
+		customSchema = schema
+		kubernetesOpenAPIVersion = "custom"
+		return nil
+	}
+
+	// use builtin version
+	kubernetesOpenAPIVersion = strings.ReplaceAll(version, ".", "")
 	if kubernetesOpenAPIVersion == "" {
 		return nil
 	}
 	if _, ok := kubernetesapi.OpenAPIMustAsset[kubernetesOpenAPIVersion]; !ok {
 		return fmt.Errorf("the specified OpenAPI version is not built in")
 	}
+	customSchema = nil
 	return nil
 }
 
 // GetSchemaVersion returns what kubernetes OpenAPI version is being used
 func GetSchemaVersion() string {
-	if kubernetesOpenAPIVersion == "" {
+	switch {
+	case kubernetesOpenAPIVersion == "" && customSchema == nil:
 		return kubernetesOpenAPIDefaultVersion
+	case customSchema != nil:
+		return "using custom schema from file provided"
+	default:
+		return kubernetesOpenAPIVersion
 	}
-	return kubernetesOpenAPIVersion
 }
 
 // initSchema parses the json schema
 func initSchema() {
+	if customSchema != nil {
+		ResetOpenAPI()
+		err := parse(customSchema)
+		if err != nil {
+			panic(err)
+		}
+		return
+	}
+
 	currentVersion := kubernetesOpenAPIVersion
 	if currentVersion == "" {
 		currentVersion = kubernetesOpenAPIDefaultVersion
 	}
 	if globalSchema.currentOpenAPIVersion != currentVersion {
-		parseSchema(currentVersion)
+		parseBuiltinSchema(currentVersion)
 	}
 	globalSchema.currentOpenAPIVersion = currentVersion
 }
 
-// parseSchema calls parse to parse the json schemas
-func parseSchema(version string) {
+// parseBuiltinSchema calls parse to parse the json schemas
+func parseBuiltinSchema(version string) {
 	if globalSchema.noUseBuiltInSchema {
 		// don't parse the built in schema
 		return