Adding init flad to skip adding repos

The stable charts repository is nearing the end of its life. Once
that has happened those who attempt to run helm init will get an
error. This flag provides a means to still use Helm v2 after the
stable charts repository is gone.

A secondary situation is that Helm v2 can be used in environmnets
without a network connection.

Closes #7868

Signed-off-by: Matt Farina <matt@mattfarina.com>

cmd/helm/init.go

@@ -80,6 +80,7 @@ type initCmd struct {
 	dryRun         bool
 	forceUpgrade   bool
 	skipRefresh    bool
+	skipRepos      bool
 	out            io.Writer
 	client         helm.Interface
 	home           helmpath.Home
@@ -118,6 +119,7 @@ func newInitCmd(out io.Writer) *cobra.Command {
 	f.BoolVarP(&i.clientOnly, "client-only", "c", false, "If set does not install Tiller")
 	f.BoolVar(&i.dryRun, "dry-run", false, "Do not install local or remote")
 	f.BoolVar(&i.skipRefresh, "skip-refresh", false, "Do not refresh (download) the local repository cache")
+	f.BoolVar(&i.skipRepos, "skip-repos", false, "Skip adding the stable and local repositories")
 	f.BoolVar(&i.wait, "wait", false, "Block until Tiller is running and ready to receive requests")
 
 	// TODO: replace TLS flags with pkg/helm/environment.AddFlagsTLS() in Helm 3
@@ -258,9 +260,15 @@ func (i *initCmd) run() error {
 		return nil
 	}
 
+	if i.skipRepos {
+		if err := installer.InitializeWithoutRepos(i.home, i.out); err != nil {
+			return fmt.Errorf("error initializing: %s", err)
+		}
+	} else {
 		if err := installer.Initialize(i.home, i.out, i.skipRefresh, settings, stableRepositoryURL, localRepositoryURL); err != nil {
 			return fmt.Errorf("error initializing: %s", err)
 		}
+	}
 	fmt.Fprintf(i.out, "$HELM_HOME has been configured at %s.\n", settings.Home)
 
 	if !i.clientOnly {

cmd/helm/installer/init.go

@@ -51,6 +51,29 @@ func Initialize(home helmpath.Home, out io.Writer, skipRefresh bool, settings he
 	return ensureRepoFileFormat(home.RepositoryFile(), out)
 }
 
+// InitializeWithoutRepos initializes local config without adding repos
+//
+// Returns an error if the command failed.
+func InitializeWithoutRepos(home helmpath.Home, out io.Writer) error {
+	if err := ensureDirectories(home, out); err != nil {
+		return err
+	}
+
+	// Adding an empty repositories file
+	repoFile := home.RepositoryFile()
+	if fi, err := os.Stat(repoFile); err != nil {
+		fmt.Fprintf(out, "Creating %s \n", repoFile)
+		f := repo.NewRepoFile()
+		if err := f.WriteFile(repoFile, 0644); err != nil {
+			return err
+		}
+	} else if fi.IsDir() {
+		return fmt.Errorf("%s must be a file, not a directory", repoFile)
+	}
+
+	return ensureRepoFileFormat(home.RepositoryFile(), out)
+}
+
 // ensureDirectories checks to see if $HELM_HOME exists.
 //
 // If $HELM_HOME does not exist, this function will create it.

cmd/helm/installer/init_test.go

@@ -68,6 +68,41 @@ func TestInitialize(t *testing.T) {
 	}
 }
 
+func TestInitializeWithoutRepos(t *testing.T) {
+	home, err := ioutil.TempDir("", "helm_home")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(home)
+
+	b := bytes.NewBuffer(nil)
+	hh := helmpath.Home(home)
+
+	if err := InitializeWithoutRepos(hh, b); err != nil {
+		t.Error(err)
+	}
+
+	expectedDirs := []string{hh.String(), hh.Repository(), hh.Cache()}
+	for _, dir := range expectedDirs {
+		if fi, err := os.Stat(dir); err != nil {
+			t.Errorf("%s", err)
+		} else if !fi.IsDir() {
+			t.Errorf("%s is not a directory", fi)
+		}
+	}
+
+	if fi, err := os.Stat(hh.RepositoryFile()); err != nil {
+		t.Error(err)
+	} else if fi.IsDir() {
+		t.Errorf("%s should not be a directory", fi)
+	}
+
+	// Make sure the local repository was not added
+	if fi, err := os.Stat(hh.LocalRepository(LocalRepositoryIndexFile)); err == nil {
+		t.Errorf("%s should not be found", fi)
+	}
+}
+
 func TestEnsureHome(t *testing.T) {
 	home, err := ioutil.TempDir("", "helm_home")
 	if err != nil {

docs/helm/helm_init.md

@@ -47,6 +47,7 @@ helm init [flags]
       --replicas int                      Amount of tiller instances to run on the cluster (default 1)
       --service-account string            Name of service account
       --skip-refresh                      Do not refresh (download) the local repository cache
+      --skip-repos                        Skip adding the stable and local repositories
       --stable-repo-url string            URL for stable repository (default "https://kubernetes-charts.storage.googleapis.com")
   -i, --tiller-image string               Override Tiller image
       --tiller-tls                        Install Tiller with TLS enabled
@@ -75,4 +76,4 @@ helm init [flags]
 
 * [helm](helm.md)	 - The Helm package manager for Kubernetes.
 
-###### Auto generated by spf13/cobra on 16-May-2019
+###### Auto generated by spf13/cobra on 25-Jun-2020