✨ Add Grafana Plugin migration in alpha generate subcommand -- Step 2

go.mod

@@ -23,7 +23,6 @@ require (
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/kr/text v0.2.0 // indirect
 	github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e // indirect
-	golang.org/x/exp v0.0.0-20230713183714-613f0c0eb8a1
 	golang.org/x/mod v0.12.0 // indirect
 	golang.org/x/net v0.12.0 // indirect
 	golang.org/x/sys v0.10.0 // indirect

go.sum

@@ -199,8 +199,6 @@ golang.org/x/exp v0.0.0-20191227195350-da58074b4299/go.mod h1:2RIsYlXP63K8oxa1u0
 golang.org/x/exp v0.0.0-20200119233911-0405dc783f0a/go.mod h1:2RIsYlXP63K8oxa1u096TMicItID8zy7Y6sNkU49FU4=
 golang.org/x/exp v0.0.0-20200207192155-f17229e696bd/go.mod h1:J/WKrq2StrnmMY6+EHIKF9dgMWnmCNThgcyBT1FY9mM=
 golang.org/x/exp v0.0.0-20200224162631-6cc2880d07d6/go.mod h1:3jZMyOhIsHpP37uCMkUooju7aAi5cS1Q23tOzKc+0MU=
-golang.org/x/exp v0.0.0-20230713183714-613f0c0eb8a1 h1:MGwJjxBy0HJshjDNfLsYO8xppfqWlA5ZT9OhtUUhTNw=
-golang.org/x/exp v0.0.0-20230713183714-613f0c0eb8a1/go.mod h1:FXUEEKJgO7OQYeo8N01OfiKP8RXMtf6e8aTskBGqWdc=
 golang.org/x/image v0.0.0-20190227222117-0694c2d4d067/go.mod h1:kZ7UVZpmo3dzQBMxlp+ypCbDeSB+sBbTgSJuh5dn5js=
 golang.org/x/image v0.0.0-20190802002840-cff245a6509b/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
 golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=

pkg/rescaffold/migrate.go

@@ -21,8 +21,6 @@ import (
 	"os/exec"
 	"strings"
 
-	"golang.org/x/exp/slices"
-
 	"github.com/spf13/afero"
 	"sigs.k8s.io/kubebuilder/v3/pkg/config"
 	"sigs.k8s.io/kubebuilder/v3/pkg/config/store"
@@ -42,7 +40,7 @@ const grafanaPluginKey = "grafana.kubebuilder.io/v1-alpha"
 
 func (opts *MigrateOptions) Rescaffold() error {
 	config := yaml.New(machinery.Filesystem{FS: afero.NewOsFs()})
-	if err := config.LoadFrom(opts.InputDir); err != nil {
+	if err := config.LoadFrom(fmt.Sprintf("%s/%s", opts.InputDir, yaml.DefaultPath)); err != nil {
 		log.Fatalf("Failed to load PROJECT file %v", err)
 	}
 	// create output directory
@@ -67,7 +65,7 @@ func (opts *MigrateOptions) Rescaffold() error {
 		log.Fatalf("Failed to run create API subcommand %v", err)
 	}
 	// plugin specific migration
-	if err := kubebuilderGrafanaPlugin(config); err != nil {
+	if err := migrateGrafanaPlugin(config, opts.InputDir, opts.OutputDir); err != nil {
 		log.Fatalf("Failed to run plugin migration %v", err)
 	}
 	return nil
@@ -102,7 +100,7 @@ func getInputPath(currentWorkingDirectory string, inputPath string) (string, err
 	if _, err := os.Stat(projectPath); os.IsNotExist(err) {
 		return "", fmt.Errorf("PROJECT path: %s does not exist. %v", projectPath, err)
 	}
-	return projectPath, nil
+	return inputPath, nil
 }
 
 func getOutputPath(currentWorkingDirectory, outputPath string) (string, error) {
@@ -152,24 +150,26 @@ func kubebuilderCreate(store store.Store) error {
 	return nil
 }
 
-func kubebuilderGrafanaPlugin(store store.Store) error {
-	// If the plugin is already in the plugin chain, we don't need call 'edit' method
-	// Because the plugin is already migrated in the previous step
-	plugins := store.Config().GetPluginChain()
-	if slices.Contains(plugins, grafanaPluginKey) {
-		return nil
-	}
-	// If the plugin is not in the plugin chain, we need to call 'edit' method to add the plugin
+func migrateGrafanaPlugin(store store.Store, src, des string) error {
 	var grafanaPlugin struct{}
 	err := store.Config().DecodePluginConfig(grafanaPluginKey, grafanaPlugin)
 	// If the grafana plugin is not found, we don't need to migrate
-	if errors.As(err, &config.PluginKeyNotFoundError{}) {
-		return nil
+	if err != nil {
+		if errors.As(err, &config.PluginKeyNotFoundError{}) {
+			log.Printf("Grafana plugin is not found, skip the migration")
+			return nil
+		}
+		return fmt.Errorf("failed to decode grafana plugin config %v", err)
 	}
+	err = kubebuilderGrafanaEdit()
 	if err != nil {
-		return fmt.Errorf("Failed to Decode Grafana Plugin: %s. %v", grafanaPluginKey, err)
+		return err
+	}
+	err = grafanaConfigMigrate(src, des)
+	if err != nil {
+		return err
 	}
-	return migrateGrafanaPlugin()
+	return kubebuilderGrafanaEdit()
 }
 
 func getInitArgs(store store.Store) []string {
@@ -258,7 +258,30 @@ func getWebhookResourceFlags(resource resource.Resource) []string {
 	return args
 }
 
-func migrateGrafanaPlugin() error {
+func copyFile(src, des string) error {
+	// nolint:gosec
+	bytesRead, err := os.ReadFile(src)
+	if err != nil {
+		return fmt.Errorf("Source file path: %s does not exist. %v", src, err)
+	}
+	//Copy all the contents to the desitination file
+	// nolint:gosec
+	return os.WriteFile(des, bytesRead, 0755)
+}
+
+func grafanaConfigMigrate(src, des string) error {
+	grafanaConfig := fmt.Sprintf("%s/%s", src, "grafana/custom-metrics/config.yaml")
+	if _, err := os.Stat(grafanaConfig); os.IsNotExist(err) {
+		return fmt.Errorf("Grafana Config path: %s does not exist. %v", grafanaConfig, err)
+	}
+	return copyFile(grafanaConfig, fmt.Sprintf("%s/%s", des, "grafana/custom-metrics/config.yaml"))
+}
+
+func kubebuilderGrafanaEdit() error {
 	args := []string{"edit", "--plugins", grafanaPluginKey}
-	return util.RunCmd("kubebuilder edit", "kubebuilder", args...)
+	err := util.RunCmd("kubebuilder edit", "kubebuilder", args...)
+	if err != nil {
+		return fmt.Errorf("Failed to run edit subcommand for Grafana Plugin %v", err)
+	}
+	return nil
 }

test/e2e/alphagenerate/generate_test.go

@@ -18,6 +18,8 @@ package alphagenerate
 
 import (
 	"fmt"
+	"io"
+	"os"
 	"path/filepath"
 
 	pluginutil "sigs.k8s.io/kubebuilder/v3/pkg/plugin/util"
@@ -127,6 +129,16 @@ func ReGenerateProject(kbc *utils.TestContext) {
 	)
 	ExpectWithOffset(1, err).NotTo(HaveOccurred())
 
+	By("Edit the grafana config file")
+	grafanaConfig, err := os.OpenFile(filepath.Join(kbc.Dir, "grafana/custom-metrics/config.yaml"),
+		os.O_APPEND|os.O_WRONLY, 0644)
+	ExpectWithOffset(1, err).NotTo(HaveOccurred())
+	newLine := "test_new_line"
+	_, err = io.WriteString(grafanaConfig, newLine)
+	ExpectWithOffset(1, err).NotTo(HaveOccurred())
+	err = grafanaConfig.Close()
+	ExpectWithOffset(1, err).NotTo(HaveOccurred())
+
 	By("regenerating the project at another output directory")
 	err = kbc.Regenerate(
 		"--input-dir", kbc.Dir,
@@ -191,4 +203,15 @@ func ReGenerateProject(kbc *utils.TestContext) {
 		filepath.Join(kbc.Dir, "testdir2", "PROJECT"), grafanaPlugin)
 	ExpectWithOffset(1, err).NotTo(HaveOccurred())
 	ExpectWithOffset(1, fileContainsExpr).To(BeTrue())
+
+	By("checking if the generated grafana config file has the same content as the old one")
+	grafanaConfigPath := filepath.Join(kbc.Dir, "grafana/custom-metrics/config.yaml")
+	generatedGrafanaConfigPath := filepath.Join(kbc.Dir, "testdir2", "grafana/custom-metrics/config.yaml")
+	Expect(grafanaConfigPath).Should(BeARegularFile())
+	Expect(generatedGrafanaConfigPath).Should(BeARegularFile())
+	bytesBefore, err := os.ReadFile(grafanaConfigPath)
+	Expect(err).NotTo(HaveOccurred())
+	bytesAfter, err := os.ReadFile(generatedGrafanaConfigPath)
+	Expect(err).NotTo(HaveOccurred())
+	Expect(bytesBefore).Should(Equal(bytesAfter))
 }