package/base-files/files/lib/functions/boot.sh

   1 #!/bin/sh
   2 # Copyright (C) 2006-2010 OpenWrt.org
   3 # Copyright (C) 2010 Vertical Communications
   4
   5 mount() {
   6         /bin/busybox mount "$@"
   7 }
   8
   9 boot_hook_add() {
  10         local hook="${1}_hook"
  11         local value="$2"
  12         local sep=" "
  13
  14         eval "$hook=\"\${$hook:+\${$hook}\${value:+\$sep}}\$value\""
  15 }
  16
  17 boot_run_hook() {
  18     local boot_func
  19     for boot_func in $(eval "echo \"\$${1}_hook\""); do
  20         $boot_func "$1" "$2"
  21     done
  22 }
  23
  24 find_mtd_part() {
  25         local PART="$(grep "\"$1\"" /proc/mtd | awk -F: '{print $1}')"
  26         local PREFIX=/dev/mtdblock
  27
  28         PART="${PART##mtd}"
  29         [ -d /dev/mtdblock ] && PREFIX=/dev/mtdblock/
  30         echo "${PART:+$PREFIX$PART}"
  31 }
  32
  33 jffs2_ready () {
  34     mtdpart="$(find_mtd_part rootfs_data)"
  35     magic=$(hexdump $mtdpart -n 4 -e '4/1 "%02x"')
  36     [ "$magic" != "deadc0de" ]
  37 }
  38
  39 dupe() { # <new_root> <old_root>
  40         cd $1
  41         echo -n "creating directories... "
  42         {
  43                 cd $2
  44                 find . -xdev -type d
  45                 echo "./dev ./overlay ./mnt ./proc ./tmp"
  46                 # xdev skips mounted directories
  47                 cd $1
  48         } | xargs mkdir -p
  49         echo "done"
  50
  51         echo -n "setting up symlinks... "
  52         for file in $(cd $2; find . -xdev -type f;); do
  53                 case "$file" in
  54                 ./rom/note) ;; #nothing
  55                 ./etc/config*|\
  56                 ./usr/lib/opkg/info/*) cp -af $2/$file $file;;
  57                 *) ln -sf /rom/${file#./*} $file;;
  58                 esac
  59         done
  60         for file in $(cd $2; find . -xdev -type l;); do
  61                 cp -af $2/${file#./*} $file
  62         done
  63         echo "done"
  64 }
  65
  66 pivot() { # <new_root> <old_root>
  67         mount -o move /proc $1/proc && \
  68         pivot_root $1 $1$2 && {
  69                 mount -o move $2/dev /dev
  70                 mount -o move $2/tmp /tmp
  71                 mount -o move $2/sys /sys 2>&-
  72                 mount -o move $2/overlay /overlay 2>&-
  73                 return 0
  74         }
  75 }
  76
  77 fopivot() { # <rw_root> <ro_root> <dupe?>
  78         root=$1
  79         {
  80                 if grep -q mini_fo /proc/filesystems; then
  81                         mount -t mini_fo -o base=/,sto=$1 "mini_fo:$1" /mnt 2>&- && root=/mnt
  82                 else
  83                         mount --bind / /mnt
  84                         mount --bind -o union "$1" /mnt && root=/mnt
  85                 fi
  86         } || {
  87                 [ "$3" = "1" ] && {
  88                 mount | grep "on $1 type" 2>&- 1>&- || mount -o bind $1 $1
  89                 dupe $1 $rom
  90                 }
  91         }
  92         pivot $root $2
  93 }
  94
  95 ramoverlay() {
  96         mkdir -p /tmp/root
  97         mount -t tmpfs root /tmp/root
  98         fopivot /tmp/root /rom 1
  99 }