Implement export to YAML

- add export commands for git sources and kustomizations
- add export e2e tests

cmd/tk/export_source_git.go

@@ -0,0 +1,93 @@
+package main
+
+import (
+	"context"
+	"fmt"
+
+	sourcev1 "github.com/fluxcd/source-controller/api/v1alpha1"
+	"github.com/spf13/cobra"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/types"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+	"sigs.k8s.io/yaml"
+)
+
+var exportSourceGitCmd = &cobra.Command{
+	Use:   "git [name]",
+	Short: "Export git source in YAML format",
+	RunE:  exportSourceGitCmdRun,
+}
+
+func init() {
+	exportSourceCmd.AddCommand(exportSourceGitCmd)
+}
+
+func exportSourceGitCmdRun(cmd *cobra.Command, args []string) error {
+	if !exportAll && len(args) < 1 {
+		return fmt.Errorf("kustomization name is required")
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), timeout)
+	defer cancel()
+
+	kubeClient, err := utils.kubeClient(kubeconfig)
+	if err != nil {
+		return err
+	}
+
+	if exportAll {
+		var list sourcev1.GitRepositoryList
+		err = kubeClient.List(ctx, &list, client.InNamespace(namespace))
+		if err != nil {
+			return err
+		}
+
+		if len(list.Items) == 0 {
+			logFailure("no source found in %s namespace", namespace)
+			return nil
+		}
+
+		for _, repository := range list.Items {
+			if err := exportGit(repository); err != nil {
+				return err
+			}
+		}
+	} else {
+		name := args[0]
+		namespacedName := types.NamespacedName{
+			Namespace: namespace,
+			Name:      name,
+		}
+		var repository sourcev1.GitRepository
+		err = kubeClient.Get(ctx, namespacedName, &repository)
+		if err != nil {
+			return err
+		}
+		return exportGit(repository)
+	}
+	return nil
+}
+
+func exportGit(source sourcev1.GitRepository) error {
+	gvk := sourcev1.GroupVersion.WithKind("GitRepository")
+	export := sourcev1.GitRepository{
+		TypeMeta: metav1.TypeMeta{
+			Kind:       gvk.Kind,
+			APIVersion: gvk.GroupVersion().String(),
+		},
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      source.Name,
+			Namespace: source.Namespace,
+		},
+		Spec: source.Spec,
+	}
+
+	data, err := yaml.Marshal(export)
+	if err != nil {
+		return err
+	}
+
+	fmt.Println("---")
+	fmt.Println(string(data))
+	return nil
+}