From f5a95fa244860bfa07f00f1c499446d24a60a697 Mon Sep 17 00:00:00 2001
From: Zhao Lei <zhaolei@cn.fujitsu.com>
Date: Wed, 6 Jul 2016 11:46:22 +0800
Subject: [PATCH] cli: Workaround for ps's argument

Currently, ps command can not support argument:
(But following usage is in manual)
 | # ./runc ps 123 -ef
 | Incorrect Usage.
 |
 | NAME:
 |    runc ps - ps displays the processes running inside a container
 |
 | USAGE:
 |    runc ps [command options] <container-id> [ps options]
 |
 | OPTIONS:
 |    --format value, -f value  select one of: table or json
 |
 | flag provided but not defined: -ef
 | #

Instead of using odd command like:
 | # ./runc ps -- 123 -ef

We can make it seems little better:
 | # ./runc ps 123 -- -ef
 | UID        PID  PPID  C STIME TTY          TIME CMD
 | root     29046 29038  0 11:18 pts/2    00:00:00 sh
 | #

This patch also fixed manual which can not working in current
code.

Closes #788

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
---
 man/runc-ps.8.md | 2 +-
 ps.go            | 5 ++++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/man/runc-ps.8.md b/man/runc-ps.8.md
index 694990a90..d60634714 100644
--- a/man/runc-ps.8.md
+++ b/man/runc-ps.8.md
@@ -2,7 +2,7 @@
    runc ps - ps displays the processes running inside a container
 
 # SYNOPSIS
-   runc ps [command options] <container-id> [ps options]
+   runc ps [command options] <container-id> [-- ps options]
 
 # OPTIONS
    --format value, -f value     select one of: table(default) or json
diff --git a/ps.go b/ps.go
index 3b462a0a5..e40a973f2 100644
--- a/ps.go
+++ b/ps.go
@@ -16,7 +16,7 @@ import (
 var psCommand = cli.Command{
 	Name:      "ps",
 	Usage:     "ps displays the processes running inside a container",
-	ArgsUsage: `<container-id> [ps options]`,
+	ArgsUsage: `<container-id> [-- ps options]`,
 	Flags: []cli.Flag{
 		cli.StringFlag{
 			Name:  "format, f",
@@ -43,6 +43,9 @@ var psCommand = cli.Command{
 		}
 
 		psArgs := context.Args().Get(1)
+		if psArgs == "--" {
+			psArgs = context.Args().Get(2)
+		}
 		if psArgs == "" {
 			psArgs = "-ef"
 		}