org.handhelds.familiar/packages/unionfs/unionroot/init.unionroot.old

   1 #!/bin/sh
   2
   3 INIT=/sbin/init.sysvinit
   4 #OVERLAYS=/media/ram /media/cf /media/card
   5 ROOTBACKUP=/media/realroot
   6 UNION=/media/union
   7 PATH=/usr/bin:/usr/sbin:/bin:/sbin
   8
   9 if ! test -e ${INIT}; then
  10         echo >&2 "ERROR: ${INIT} not found"
  11         exit 1
  12 fi
  13
  14 if test x"$*" != "x"; then
  15         exec ${INIT} $*
  16 fi
  17
  18 if ! which unionctl; then
  19         exec ${INIT}
  20 fi
  21
  22 nodupmount () {
  23         opts=""
  24         type=""
  25         while true; do
  26                 if test "$1" = "-o"; then
  27                         shift
  28                         opts="-o $1"
  29                         shift
  30                 elif test "$1" = "-t"; then
  31                         shift
  32                         type="$1"
  33                         shift
  34                 else
  35                         break
  36                 fi
  37         done
  38         if test x"$2" = "x"; then
  39                 mountpt="$1"
  40         else
  41                 device="$1"
  42                 mountpt="$2"
  43         fi
  44         mountmatch="^[^ ]+ $mountpt $type"
  45         # echo "NOTE: grep -E -q \"$mountmatch\" /proc/mounts"
  46         if grep -E -q "$mountmatch" /proc/mounts; then
  47                 return 0;
  48         fi
  49         if test x"$type" != "x"; then
  50                 type="-t $type"
  51         fi
  52         echo >&2 "NOTE: executing mount $type $opts $device $mountpt"
  53         mkdir -p $mountpt
  54         /bin/mount.busybox $type $opts $device $mountpt
  55         ret="$?"
  56         if test "$ret" = "0"; then
  57                 wemounted="$wemounted $mountpt"
  58         fi
  59         return $ret
  60 }
  61
  62 #set -x
  63 wemounted=""
  64 (
  65         set -e
  66         /bin/mount.busybox /proc
  67         insmod /lib/modules/`uname -r`/kernel/fs/unionfs.o
  68         nodupmount -t unionfs -o dirs=/.=rw,setattr=all none ${UNION}
  69 #       nodupmount -o bind / ${UNION}/${ROOTBACKUP}
  70 #       for OVERLAY in ${OVERLAYS}; do
  71 #               nodupmount ${OVERLAY}
  72 #               union-ctl /. --add --mode rw ${OVERLAY}
  73 #               nodupmount -o bind ${OVERLAY} ${UNION}/${OVERLAY}
  74 #       done
  75         /bin/umount.busybox /proc
  76 #       nodupmount -o bind /proc ${UNION}/proc
  77 #       nodupmount -o bind / ${ROOTBACKUP}
  78 ) || (
  79         echo >&2 "ERROR: unable to setup mounts for chroot";
  80         if test x"$wemounted" != "x"; then
  81                 # cleanup
  82                 for mount in $wemounted; do
  83                         /bin/umount.busybox $mount
  84                 done
  85         fi
  86         exec ${INIT}
  87 )
  88 cd ${UNION}
  89 pivot_root . ./${ROOTBACKUP}
  90 exec chroot . ${INIT}