share/lxc.mount.hook.in

   1 #!/bin/sh -e
   2
   3 # Parse command flags
   4 while [ ! $# -eq 0 ]
   5 do
   6         case "$1" in
   7                 --skip-cgroup-mounts )
   8                         SKIP_CGROUP_MOUNTS=1
   9                         ;;
  10         esac
  11         shift
  12 done
  13
  14 # We're dealing with mount entries, so expand any symlink
  15 LXC_ROOTFS_MOUNT=$(readlink -f "${LXC_ROOTFS_MOUNT}")
  16
  17 # /proc files
  18 if [ -d {{LXCFSTARGETDIR}}/proc/ ]; then
  19     for entry in {{LXCFSTARGETDIR}}/proc/*; do
  20         DEST=$(basename "$entry")
  21         [ -e "${LXC_ROOTFS_MOUNT}/proc/${DEST}" ] || continue
  22         mount -n --bind "$entry" "${LXC_ROOTFS_MOUNT}/proc/${DEST}"
  23     done
  24 fi
  25
  26 # /sys/devices/system/cpu
  27 if [ -d {{LXCFSTARGETDIR}}/sys/devices/system/cpu ] ; then
  28     if [ -f {{LXCFSTARGETDIR}}/sys/devices/system/cpu/uevent ]; then
  29         mount -n --bind {{LXCFSTARGETDIR}}/sys/devices/system/cpu "${LXC_ROOTFS_MOUNT}/sys/devices/system/cpu"
  30     else
  31         for entry in {{LXCFSTARGETDIR}}/sys/devices/system/cpu/*; do
  32             DEST=$(basename "$entry")
  33             [ -e "${LXC_ROOTFS_MOUNT}/sys/devices/system/cpu/${DEST}" ] || continue
  34             mount -n --bind "$entry" "${LXC_ROOTFS_MOUNT}/sys/devices/system/cpu/${DEST}"
  35         done
  36     fi
  37 fi
  38
  39 # Allow nesting lxcfs
  40 if [ -d "${LXC_ROOTFS_MOUNT}{{LXCFSTARGETDIR}}/" ]; then
  41     mount -n --bind {{LXCFSTARGETDIR}} "${LXC_ROOTFS_MOUNT}{{LXCFSTARGETDIR}}/"
  42 fi
  43
  44 # no need for lxcfs cgroups if we have cgroup namespaces
  45 [ -n "$LXC_CGNS_AWARE" ] && [ -f /proc/self/ns/cgroup ] && exit 0
  46
  47 # Don't mess with containers that don't have /sys/fs/cgroup configured
  48 # (lxc.mount.auto = cgroup:mixed)
  49 if touch "${LXC_ROOTFS_MOUNT}/sys/fs/cgroup/lxcfs"; then
  50     rm "${LXC_ROOTFS_MOUNT}/sys/fs/cgroup/lxcfs"
  51 else
  52     exit 0
  53 fi
  54
  55 # Skip mounting cgroup tree if requested.
  56 if [ "${SKIP_CGROUP_MOUNTS}" = "1" ]; then
  57         exit 0
  58 fi
  59
  60 # /sys/fs/cgroup files
  61 if [ -d "${LXC_ROOTFS_MOUNT}/sys/fs/cgroup" ]; then
  62     if [ -d {{LXCFSTARGETDIR}}/cgroup ]; then
  63         # Cleanup existing mounts
  64         for entry in "${LXC_ROOTFS_MOUNT}/sys/fs/cgroup"/*; do
  65             DEST=$(basename "$entry")
  66
  67             if [ "${DEST}" = "cgmanager" ]; then
  68                 continue
  69             fi
  70
  71             if [ ! -d "${LXC_ROOTFS_MOUNT}/sys/fs/cgroup/${DEST}" ]; then
  72                 continue
  73             fi
  74
  75             while grep -q "${LXC_ROOTFS_MOUNT}/sys/fs/cgroup/${DEST}" /proc/self/mountinfo; do
  76                 grep "${LXC_ROOTFS_MOUNT}/sys/fs/cgroup/${DEST}" /proc/self/mountinfo | cut -d' ' -f5 | while read -r line; do
  77                      [ -e "${line}" ] || continue
  78                      umount -l "${line}" || true
  79                 done
  80             done
  81
  82             rm -Rf "${LXC_ROOTFS_MOUNT}/sys/fs/cgroup/${DEST}"
  83         done
  84
  85         # Mount the new entries
  86         for entry in {{LXCFSTARGETDIR}}/cgroup/*; do
  87             DEST=$(basename "$entry")
  88             if [ "$DEST" = "name=systemd" ]; then
  89                 DEST="systemd"
  90             fi
  91
  92             if [ ! -d "${LXC_ROOTFS_MOUNT}/sys/fs/cgroup/${DEST}" ]; then
  93                 mkdir "${LXC_ROOTFS_MOUNT}/sys/fs/cgroup/${DEST}"
  94             fi
  95
  96             mount -n --bind "$entry" "${LXC_ROOTFS_MOUNT}/sys/fs/cgroup/${DEST}"
  97
  98             # make sure that cpu,cpuacct shows up as cpu and cpuacct
  99             # separately, else systemd is unhappy
 100             if echo "$DEST" | grep -q ","; then
 101                 arr=$(echo "$DEST" | tr "," "\n")
 102                 for single in $arr
 103                 do
 104                     if [ ! -L "${LXC_ROOTFS_MOUNT}/sys/fs/cgroup/${single}" ]; then
 105                         ln -s "$DEST" "${LXC_ROOTFS_MOUNT}/sys/fs/cgroup/${single}"
 106                     fi
 107                 done
 108             fi
 109         done
 110     fi
 111 fi
 112
 113 exit 0