Add completion for `--ulimit`

Signed-off-by: Harald Albers <github@albersweb.de>
(cherry picked from commit 5d709a8d9f)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

cli/command/container/completion.go

@@ -70,6 +70,7 @@ func addCompletions(cmd *cobra.Command, dockerCLI completion.APIClientProvider)
 	_ = cmd.RegisterFlagCompletionFunc("restart", completeRestartPolicies)
 	_ = cmd.RegisterFlagCompletionFunc("stop-signal", completeSignals)
 	_ = cmd.RegisterFlagCompletionFunc("storage-opt", completeStorageOpt)
+	_ = cmd.RegisterFlagCompletionFunc("ulimit", completeUlimit)
 	_ = cmd.RegisterFlagCompletionFunc("volumes-from", completion.ContainerNames(dockerCLI, true))
 }
 
@@ -120,6 +121,32 @@ func completeStorageOpt(_ *cobra.Command, _ []string, _ string) ([]string, cobra
 	return []string{"size="}, cobra.ShellCompDirectiveNoSpace
 }
 
+// completeUlimit implements shell completion for the `--ulimit` option of `run` and `create`.
+func completeUlimit(_ *cobra.Command, _ []string, _ string) ([]string, cobra.ShellCompDirective) {
+	limits := []string{
+		"as",
+		"chroot",
+		"core",
+		"cpu",
+		"data",
+		"fsize",
+		"locks",
+		"maxlogins",
+		"maxsyslogins",
+		"memlock",
+		"msgqueue",
+		"nice",
+		"nofile",
+		"nproc",
+		"priority",
+		"rss",
+		"rtprio",
+		"sigpending",
+		"stack",
+	}
+	return postfixWith("=", limits), cobra.ShellCompDirectiveNoSpace
+}
+
 // containerNames contacts the API to get names and optionally IDs of containers.
 // In case of an error, an empty list is returned.
 func containerNames(dockerCLI completion.APIClientProvider, cmd *cobra.Command, args []string, toComplete string) []string {