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 -o noatime "$@"
   7 }
   8
   9 boot_hook_splice_start() {
  10         export -n PI_HOOK_SPLICE=1
  11 }
  12
  13 boot_hook_splice_finish() {
  14         local hook
  15         for hook in $PI_STACK_LIST; do
  16                 local v; eval "v=\${${hook}_splice:+\$${hook}_splice }$hook"
  17                 export -n "${hook}=${v% }"
  18                 export -n "${hook}_splice="
  19         done
  20         export -n PI_HOOK_SPLICE=
  21 }
  22
  23 boot_hook_init() {
  24         local hook="${1}_hook"
  25         export -n "PI_STACK_LIST=${PI_STACK_LIST:+$PI_STACK_LIST }$hook"
  26         export -n "$hook="
  27 }
  28
  29 boot_hook_add() {
  30         local hook="${1}_hook${PI_HOOK_SPLICE:+_splice}"
  31         local func="${2}"
  32
  33         [ -n "$func" ] && {
  34                 local v; eval "v=\$$hook"
  35                 export -n "$hook=${v:+$v }$func"
  36         }
  37 }
  38
  39 boot_hook_shift() {
  40         local hook="${1}_hook"
  41         local rvar="${2}"
  42
  43         local v; eval "v=\$$hook"
  44         [ -n "$v" ] && {
  45                 local first="${v%% *}"
  46
  47                 [ "$v" != "${v#* }" ] && \
  48                         export -n "$hook=${v#* }" || \
  49                         export -n "$hook="
  50
  51                 export -n "$rvar=$first"
  52                 return 0
  53         }
  54
  55         return 1
  56 }
  57
  58 boot_run_hook() {
  59         local hook="$1"
  60         local func
  61
  62         while boot_hook_shift "$hook" func; do
  63                 local ran; eval "ran=\$PI_RAN_$func"
  64                 [ -n "$ran" ] || {
  65                         export -n "PI_RAN_$func=1"
  66                         $func "$1" "$2"
  67                 }
  68         done
  69 }
  70
  71 find_mtd_part() {
  72         local PART="$(grep "\"$1\"" /proc/mtd | awk -F: '{print $1}')"
  73         local PREFIX=/dev/mtdblock
  74
  75         PART="${PART##mtd}"
  76         [ -d /dev/mtdblock ] && PREFIX=/dev/mtdblock/
  77         echo "${PART:+$PREFIX$PART}"
  78 }
  79
  80 jffs2_ready () {
  81         mtdpart="$(find_mtd_part rootfs_data)"
  82         [ -z "$mtdpart" ] && return 1
  83         magic=$(hexdump $mtdpart -n 4 -e '4/1 "%02x"')
  84         [ "$magic" != "deadc0de" ]
  85 }
  86
  87 dupe() { # <new_root> <old_root>
  88         cd $1
  89         echo -n "creating directories... "
  90         {
  91                 cd $2
  92                 find . -xdev -type d
  93                 echo "./dev ./overlay ./mnt ./proc ./tmp"
  94                 # xdev skips mounted directories
  95                 cd $1
  96         } | xargs mkdir -p
  97         echo "done"
  98
  99         echo -n "setting up symlinks... "
 100         for file in $(cd $2; find . -xdev -type f;); do
 101                 case "$file" in
 102                 ./rom/note) ;; #nothing
 103                 ./etc/config*|\
 104                 ./usr/lib/opkg/info/*) cp -af $2/$file $file;;
 105                 *) ln -sf /rom/${file#./*} $file;;
 106                 esac
 107         done
 108         for file in $(cd $2; find . -xdev -type l;); do
 109                 cp -af $2/${file#./*} $file
 110         done
 111         echo "done"
 112 }
 113
 114 pivot() { # <new_root> <old_root>
 115         mount -o move /proc $1/proc && \
 116         pivot_root $1 $1$2 && {
 117                 mount -o move $2/dev /dev
 118                 mount -o move $2/tmp /tmp
 119                 mount -o move $2/sys /sys 2>&-
 120                 mount -o move $2/overlay /overlay 2>&-
 121                 return 0
 122         }
 123 }
 124
 125 fopivot() { # <rw_root> <ro_root> <dupe?>
 126         root=$1
 127         {
 128                 if grep -q overlay /proc/filesystems; then
 129                         mount -t overlayfs -olowerdir=/,upperdir=$1 "overlayfs:$1" /mnt && root=/mnt
 130                 elif grep -q mini_fo /proc/filesystems; then
 131                         mount -t mini_fo -o base=/,sto=$1 "mini_fo:$1" /mnt 2>&- && root=/mnt
 132                 else
 133                         mount --bind / /mnt
 134                         mount --bind -o union "$1" /mnt && root=/mnt
 135                 fi
 136         } || {
 137                 [ "$3" = "1" ] && {
 138                 mount | grep "on $1 type" 2>&- 1>&- || mount -o bind $1 $1
 139                 dupe $1 $rom
 140                 }
 141         }
 142         pivot $root $2
 143 }
 144
 145 ramoverlay() {
 146         mkdir -p /tmp/root
 147         mount -t tmpfs -o mode=0755 root /tmp/root
 148         fopivot /tmp/root /rom 1
 149 }
 150