Accurately detect whether a system supports clone_children

If multiple cgroups are mounted under /sys/fs/cgroup, then the original check ends up looking for /sys/fs/cgroup/cgroup.clone_children, which does not exist because that is just a tmpfs. So make sure to check an actual cgroupfs. Signed-off-by: Serge Hallyn <serge.hallyn@canonical.com> Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>

Accurately detect whether a system supports clone_children
3e2981d4 · Serge E. Hallyn · Daniel Lezcano · b91b1cd7 · 3e2981d4
Commit 3e2981d4 authored Oct 24, 2011 by Serge E. Hallyn Committed by Daniel Lezcano Oct 24, 2011
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lxc-checkconfig.in src/lxc/lxc-checkconfig.in +6 -1

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--- a/src/lxc/lxc-checkconfig.in
+++ b/src/lxc/lxc-checkconfig.in
@@ -63,7 +63,12 @@ echo -n "Multiple /dev/pts instances: " && is_enabled DEVPTS_MULTIPLE_INSTANCES
 echo
 echo "--- Control groups ---"

-CGROUP_MNT_PATH=$(grep -m1 "^cgroup" /proc/self/mounts | awk '{ print $2 }')
+print_cgroups() {
+  # print all mountpoints for cgroup filesystems
+  awk '$1 !~ /#/ && $3 == mp { print $2; } ; END { exit(0); } '  "mp=$1" "$2" ;
+}
+
+CGROUP_MNT_PATH=`print_cgroups cgroup /proc/self/mounts | head -1`

 echo -n "Cgroup: " && is_enabled CONFIG_CGROUPS yes