Fix #3352, add support for --ignore-not-found just like kubectl delete

Signed-off-by: suzaku <satorulogic@gmail.com>

cmd/helm/uninstall.go

@@ -74,6 +74,7 @@ func newUninstallCmd(cfg *action.Configuration, out io.Writer) *cobra.Command {
 	f := cmd.Flags()
 	f.BoolVar(&client.DryRun, "dry-run", false, "simulate a uninstall")
 	f.BoolVar(&client.DisableHooks, "no-hooks", false, "prevent hooks from running during uninstallation")
+	f.BoolVar(&client.IgnoreNotFound, "ignore-not-found", false, `Treat "release not found" as a successful uninstall`)
 	f.BoolVar(&client.KeepHistory, "keep-history", false, "remove all associated resources and mark the release as deleted, but retain the release history")
 	f.BoolVar(&client.Wait, "wait", false, "if set, will wait until all the resources are deleted before returning. It will wait for as long as --timeout")
 	f.StringVar(&client.DeletionPropagation, "cascade", "background", "Must be \"background\", \"orphan\", or \"foreground\". Selects the deletion cascading strategy for the dependents. Defaults to background.")

pkg/action/uninstall.go

@@ -38,6 +38,7 @@ type Uninstall struct {
 
 	DisableHooks        bool
 	DryRun              bool
+	IgnoreNotFound      bool
 	KeepHistory         bool
 	Wait                bool
 	DeletionPropagation string
@@ -73,6 +74,9 @@ func (u *Uninstall) Run(name string) (*release.UninstallReleaseResponse, error)
 
 	rels, err := u.cfg.Releases.History(name)
 	if err != nil {
+		if u.IgnoreNotFound {
+			return nil, nil
+		}
 		return nil, errors.Wrapf(err, "uninstall: Release not loaded: %s", name)
 	}
 	if len(rels) < 1 {

pkg/action/uninstall_test.go

@@ -32,6 +32,17 @@ func uninstallAction(t *testing.T) *Uninstall {
 	return unAction
 }
 
+func TestUninstallRelease_ignoreNotFound(t *testing.T) {
+	unAction := uninstallAction(t)
+	unAction.DryRun = false
+	unAction.IgnoreNotFound = true
+
+	is := assert.New(t)
+	res, err := unAction.Run("release-non-exist")
+	is.Nil(res)
+	is.NoError(err)
+}
+
 func TestUninstallRelease_deleteRelease(t *testing.T) {
 	is := assert.New(t)