add no prune to rmi

Docker-DCO-1.1-Signed-off-by: Victor Vieux <victor.vieux@docker.com> (github: vieux)

api/client.go

@@ -817,8 +817,9 @@ func (cli *DockerCli) CmdPort(args ...string) error {
 // 'docker rmi IMAGE' removes all images with the name IMAGE
 func (cli *DockerCli) CmdRmi(args ...string) error {
 	var (
-		cmd   = cli.Subcmd("rmi", "IMAGE [IMAGE...]", "Remove one or more images")
-		force = cmd.Bool([]string{"f", "-force"}, false, "Force")
+		cmd     = cli.Subcmd("rmi", "IMAGE [IMAGE...]", "Remove one or more images")
+		force   = cmd.Bool([]string{"f", "-force"}, false, "Force")
+		noprune = cmd.Bool([]string{"-no-prune"}, false, "Do not delete untagged parents")
 	)
 	if err := cmd.Parse(args); err != nil {
 		return nil
@@ -832,6 +833,9 @@ func (cli *DockerCli) CmdRmi(args ...string) error {
 	if *force {
 		v.Set("force", "1")
 	}
+	if *noprune {
+		v.Set("noprune", "1")
+	}
 
 	var encounteredError error
 	for _, name := range cmd.Args() {

api/server.go

@@ -624,6 +624,7 @@ func deleteImages(eng *engine.Engine, version version.Version, w http.ResponseWr
 	var job = eng.Job("image_delete", vars["name"])
 	streamJSON(job, w, false)
 	job.Setenv("force", r.Form.Get("force"))
+	job.Setenv("noprune", r.Form.Get("noprune"))
 
 	return job.Run()
 }