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