Merge pull request #6419 from thaJeztah/complete_pull

add completion for docker image pull

Author: thaJeztah

cli/command/image/pull.go

@@ -38,7 +38,9 @@ func newPullCommand(dockerCLI command.Cli) *cobra.Command {
 			"category-top": "5",
 			"aliases":      "docker image pull, docker pull",
 		},
-		ValidArgsFunction:     cobra.NoFileCompletions,
+		// Complete with local images to help pulling the latest version
+		// of images that are in the image cache.
+		ValidArgsFunction:     completion.ImageNames(dockerCLI, 1),
 		DisableFlagsInUseLine: true,
 	}