Rollback command support for max history

Signed-off-by: wawa0210 <xiaozhang0210@hotmail.com>

cmd/helm/rollback.go

@@ -83,6 +83,7 @@ func newRollbackCmd(cfg *action.Configuration, out io.Writer) *cobra.Command {
 	f.DurationVar(&client.Timeout, "timeout", 300*time.Second, "time to wait for any individual Kubernetes operation (like Jobs for hooks)")
 	f.BoolVar(&client.Wait, "wait", false, "if set, will wait until all Pods, PVCs, Services, and minimum number of Pods of a Deployment, StatefulSet, or ReplicaSet are in a ready state before marking the release as successful. It will wait for as long as --timeout")
 	f.BoolVar(&client.CleanupOnFail, "cleanup-on-fail", false, "allow deletion of new resources created in this rollback when rollback fails")
+	f.IntVar(&client.MaxHistory, "history-max", settings.MaxHistory, "limit the maximum number of revisions saved per release. Use 0 for no limit")
 
 	return cmd
 }

pkg/action/rollback.go

@@ -42,6 +42,7 @@ type Rollback struct {
 	Recreate      bool // will (if true) recreate pods after a rollback.
 	Force         bool // will (if true) force resource upgrade through uninstall/recreate if needed
 	CleanupOnFail bool
+	MaxHistory    int // MaxHistory limits the maximum number of revisions saved per release
 }
 
 // NewRollback creates a new Rollback object with the given configuration.
@@ -57,6 +58,8 @@ func (r *Rollback) Run(name string) error {
 		return err
 	}
 
+	r.cfg.Releases.MaxHistory = r.MaxHistory
+
 	r.cfg.Log("preparing rollback of %s", name)
 	currentRelease, targetRelease, err := r.prepareRollback(name)
 	if err != nil {