mount: failure to mount cgroup hierarchies should not be fatal

If we cannot open /etc/cgroup, print an error message, but go on, to
support cgroup-less builds.

https://bugzilla.redhat.com/show_bug.cgi?id=628004

1 files changed, 4 insertions, 2 deletions

diff --git a/src/mount-setup.c b/src/mount-setup.c
index 77be8fead8..48c32eab33 100644
--- a/src/mount-setup.c
+++ b/src/mount-setup.c
@@ -136,8 +136,10 @@ static int mount_cgroup_controllers(void) {
 
         /* Mount all available cgroup controllers that are built into the kernel. */
 
-        if (!(f = fopen("/proc/cgroups", "re")))
-                return -ENOENT;
+        if (!(f = fopen("/proc/cgroups", "re"))) {
+                log_error("Failed to enumerate cgroup controllers: %m");
+                return 0;
+        }
 
         /* Ignore the header line */
         (void) fgets(buf, sizeof(buf), f);