Merge pull request #9281 from unclejack/build_pull_flag

build: add pull flag to force image pulling
Upstream-commit: 5e19ecf25c942ae809ad5b5cf0bb010845395e58
Component: engine

components/engine/api/client/commands.go

@@ -81,6 +81,7 @@ func (cli *DockerCli) CmdBuild(args ...string) error {
 	noCache := cmd.Bool([]string{"#no-cache", "-no-cache"}, false, "Do not use cache when building the image")
 	rm := cmd.Bool([]string{"#rm", "-rm"}, true, "Remove intermediate containers after a successful build")
 	forceRm := cmd.Bool([]string{"-force-rm"}, false, "Always remove intermediate containers, even after unsuccessful builds")
+	pull := cmd.Bool([]string{"-pull"}, false, "Always attempt to pull a newer version of the image")
 	if err := cmd.Parse(args); err != nil {
 		return nil
 	}
@@ -217,6 +218,9 @@ func (cli *DockerCli) CmdBuild(args ...string) error {
 		v.Set("forcerm", "1")
 	}
 
+	if *pull {
+		v.Set("pull", "1")
+	}
 	cli.LoadConfigFile()
 
 	headers := http.Header(make(map[string][]string))

components/engine/api/server/server.go

@@ -1016,6 +1016,9 @@ func postBuild(eng *engine.Engine, version version.Version, w http.ResponseWrite
 	} else {
 		job.Setenv("rm", r.FormValue("rm"))
 	}
+	if r.FormValue("pull") == "1" && version.GreaterThanOrEqualTo("1.16") {
+		job.Setenv("pull", "1")
+	}
 	job.Stdin.Add(r.Body)
 	job.Setenv("remote", r.FormValue("remote"))
 	job.Setenv("t", r.FormValue("t"))