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