From e97a84757f76b9c4c401bbc6fa147e35204b2a1b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mantas=20Mikul=C4=97nas?= <grawity@gmail.com>
Date: Mon, 30 Nov 2015 08:48:29 +0200
Subject: [PATCH] cgls: add a better error message for missing cgroupfs

---
 src/cgls/cgls.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/cgls/cgls.c b/src/cgls/cgls.c
index 01140c73d8..e6277a9084 100644
--- a/src/cgls/cgls.c
+++ b/src/cgls/cgls.c
@@ -131,7 +131,9 @@ static int get_cgroup_root(char **ret) {
 
         if (!arg_machine) {
                 r = cg_get_root_path(ret);
-                if (r < 0)
+                if (r == -ENOEXEC)
+                        return log_error_errno(r, "Failed to get root control group path: No cgroup filesystem mounted on /sys/fs/cgroup");
+                else if (r < 0)
                         return log_error_errno(r, "Failed to get root control group path: %m");
 
                 return 0;