add generate crd CLI option

Author: John Kim

commands/operator-sdk/cmd/generate.go

@@ -29,5 +29,6 @@ func NewGenerateCmd() *cobra.Command {
 	}
 	cmd.AddCommand(generate.NewGenerateK8SCmd())
 	cmd.AddCommand(generate.NewGenerateOlmCatalogCmd())
+	cmd.AddCommand(generate.NewGenerateCrdCmd())
 	return cmd
 }

commands/operator-sdk/cmd/generate/crd.go

@@ -0,0 +1,68 @@
+// Copyright 2018 The Operator-SDK Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package generate
+
+import (
+	"errors"
+	"fmt"
+	"os"
+
+	cmdError "github.com/operator-framework/operator-sdk/commands/operator-sdk/error"
+	"github.com/operator-framework/operator-sdk/pkg/generator"
+	"github.com/spf13/cobra"
+)
+
+var (
+	apiVersion string
+	kind       string
+)
+
+func NewGenerateCrdCmd() *cobra.Command {
+	crdCmd := &cobra.Command{
+		Use:   "crd",
+		Short: "Generates a custom resource definition",
+		Long: `generates a custom resource definition (CRD) file for the .
+`,
+		Run: crdFunc,
+	}
+	crdCmd.Flags().StringVar(&apiVersion, "api-version", "", "Kubernetes apiVersion and has a format of $GROUP_NAME/$VERSION (e.g app.example.com/v1alpha1)")
+	crdCmd.MarkFlagRequired("api-version")
+	crdCmd.Flags().StringVar(&kind, "kind", "", "Kubernetes CustomResourceDefintion kind. (e.g AppService)")
+	crdCmd.MarkFlagRequired("kind")
+	return crdCmd
+}
+
+func crdFunc(cmd *cobra.Command, args []string) {
+	if len(args) != 0 {
+		cmdError.ExitWithError(cmdError.ExitBadArgs, errors.New("crd command doesn't accept any arguments."))
+	}
+	verifyCrdFlags()
+
+	fmt.Fprintln(os.Stdout, "Generating custom resource definition (CRD) file")
+
+	// Generate CRD file
+	if err := generator.RenderDeployCrdFile(apiVersion, kind); err != nil {
+		cmdError.ExitWithError(cmdError.ExitError, fmt.Errorf("failed to generate CRD file: (%v)", err))
+	}
+}
+
+func verifyCrdFlags() {
+	if len(apiVersion) == 0 {
+		cmdError.ExitWithError(cmdError.ExitBadArgs, errors.New("--api-version must not have empty value"))
+	}
+	if len(kind) == 0 {
+		cmdError.ExitWithError(cmdError.ExitBadArgs, errors.New("--kind must not have empty value"))
+	}
+}

pkg/generator/generator.go

@@ -336,6 +336,18 @@ func renderRBAC(deployDir, projectName, groupName string) error {
 	return renderWriteFile(filepath.Join(deployDir, rbacYaml), rbacTmplName, rbacYamlTmpl, td)
 }
 
+func RenderDeployCrdFile(apiVersion, kind string) error {
+	crdTd := tmplData{
+		Kind:         kind,
+		KindSingular: strings.ToLower(kind),
+		KindPlural:   toPlural(strings.ToLower(kind)),
+		GroupName:    groupName(apiVersion),
+		Version:      version(apiVersion),
+	}
+	crdFilePath := filepath.Join(deployDir, strings.ToLower(kind) + "_crd.yaml")
+	return renderWriteFile(crdFilePath, crdFilePath, crdYamlTmpl, crdTd)
+}
+
 func renderDeployFiles(deployDir, projectName, apiVersion, kind, operatorType string) error {
 	rbacTd := tmplData{
 		ProjectName: projectName,