target/share/livecd/init2

   1 #!/bin/sh
   2
   3 echo "T2 live setup (C) 2005 - 2007 Rene Rebe, ExactCODE"
   4
   5 mkdir -p /tmp ; chmod 1777 /tmp
   6
   7 livedev=`sed -n '/[^ ]* \/media\/live/{s/ .*//p; q}' /proc/mounts`
   8
   9 if mount -n $livedev -o remount,rw /media/live 2>/dev/null; then
  10         echo "Re-mounted /media/live read-write."
  11 fi
  12
  13 echo "Unionfs overlay setup ..."
  14
  15 dirs='/mnt/live=ro'
  16 rw=0
  17 for f in /media/live/live-*.*; do
  18         [ -e $f ] || continue
  19
  20         n=${f##*/}; n=${n%.*}
  21         mkdir -p /mnt/$n
  22         if mount -nt auto -o loop,noatime $f /mnt/$n; then
  23                 if grep -q "/mnt/$n .* rw" /proc/mounts; then
  24                         echo "Mounted $f read-write."
  25                         dirs="/mnt/$n=rw:$dirs"
  26                         rw=1
  27                 else
  28                         echo "Mounted $f read-only."
  29                         dirs="/mnt/$n=ro:$dirs"
  30                 fi
  31         else
  32                 echo "Failed to mount $f!"
  33         fi
  34 done
  35
  36 # determine union fs to use, TODO: allow user-overwrite
  37 unionfs=
  38 modprobe aufs 2> /dev/null
  39 if grep -q 'aufs$' /proc/filesystems; then unionfs=aufs
  40 elif grep -q 'unionfs$' /proc/filesystems; then unionfs=unionfs
  41 fi
  42
  43 if [ "$unionfs" ]; then
  44         if [ $rw = 0 ]; then
  45                 mkdir -p /mnt/overlay
  46                 mount -nt tmpfs none /mnt/overlay
  47                 dirs="/mnt/overlay:$dirs"
  48         fi
  49
  50         mount -nt $unionfs -o noatime,dirs=$dirs none /mnt/live
  51
  52         echo "Finalizing setup ..."
  53         cat /proc/mounts > /etc/mtab
  54
  55         find /tmp/lib -type f -name '*.ko' | while read f; do
  56                 f=${f#/tmp}
  57                 [ -e $f ] || mv -f /tmp/$f $f
  58         done
  59 fi
  60
  61 # convert symlinks to bind mounts
  62 for x in /mnt/live/* ; do
  63         x=${x#/mnt/live/}
  64         case $x in
  65                 dev|proc|sys|media|mnt|tmp) continue ;;
  66         esac
  67         if [ -e /$x ]; then
  68 #               echo "Removing /$x ..."
  69                 /tmp/bin/rm -rf /$x
  70         fi
  71 #       echo "Binding /mnt/live/$x /$x"
  72         /tmp/bin/mkdir -p /$x
  73         /tmp/bin/mount -t none -o bind /mnt/live/$x /$x
  74 done
  75
  76 rm -rf /tmp/lib /tmp/bin /init{,2}
  77
  78 init="init= `cat /proc/cmdline`" ; init=${init##*init=} ; init=${init%% *}
  79 # TODO: later on search other places if we want 100% backward compat.
  80 [ "$init" ] || init=/sbin/init
  81 if [ -f $init ]; then
  82         exec $init $*
  83 fi
  84
  85 echo "No init found, giving up. Debug shell:"
  86 exec sh --login