hooks/mountcgroups

   1 #!/bin/bash
   2
   3 # (C) Copyright Canonical 2011,2012
   4
   5 # This library is free software; you can redistribute it and/or
   6 # modify it under the terms of the GNU Lesser General Public
   7 # License as published by the Free Software Foundation; either
   8 # version 2.1 of the License, or (at your option) any later version.
   9
  10 # This library is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 # Lesser General Public License for more details.
  14
  15 # You should have received a copy of the GNU Lesser General Public
  16 # License along with this library; if not, write to the Free Software
  17 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18
  19 #
  20 # This is an example hook to mount all mounted cgroups in the
  21 # container.  Only the container's own cgroup (not parents) will be
  22 # accessible to the container.  You can enable this by adding
  23 # lxc.hook.mount = /usr/share/lxc/hooks/mountcgroups
  24 # to your container's configuration file.
  25
  26 set -e
  27
  28 c=$1
  29 d=/sys/fs/cgroup
  30 d2=$LXC_ROOTFS_MOUNT/${d}
  31 if [ ! -d "$d" ]; then
  32     exit 0
  33 fi
  34
  35 mount -n -t tmpfs tmpfs ${d2}
  36
  37 # XXX TODO - we'll need to account for other cgroup groups beside 'lxc',
  38 # i.e. 'build' or 'users/joe'.
  39 for dir in `/bin/ls $d`; do
  40     mkdir -p "${d}/${dir}/lxc/${c}/${c}.real"
  41     echo 1 > "${d}/${dir}/lxc/${c}/${c}.real/tasks"
  42     mkdir -p ${d2}/${dir}
  43     mount -n --bind "${d}/${dir}/lxc/${c}/${c}.real" "${d2}/${dir}"
  44 done