add preinit modularization work by Daniel Dickinson (cshore)

[openwrt/svn-archive/archive.git] / package / base-files / files / lib / functions / boot.sh

diff --git a/package/base-files/files/lib/functions/boot.sh b/package/base-files/files/lib/functions/boot.sh
new file mode 100644 (file)
index 0000000..46b4613
--- /dev/null
+++ b/package/base-files/files/lib/functions/boot.sh
@@ -0,0 +1,95 @@
+#!/bin/sh
+# Copyright (C) 2006-2010 OpenWrt.org
+# Copyright (C) 2010 Vertical Communications
+
+boot_hook_add() {
+       local hook="${1}_hook"
+       local value="$2"
+       local sep=" "
+       
+       eval "$hook=\"\${$hook:+\${$hook}\${value:+\$sep}}\$value\""
+}
+
+boot_run_hook() {
+    local boot_func
+    for boot_func in $(eval "echo \"\$${1}_hook\""); do
+       $boot_func "$1" "$2"
+    done
+}
+
+find_mtd_part() {
+       local PART="$(grep "\"$1\"" /proc/mtd | awk -F: '{print $1}')"
+       local PREFIX=/dev/mtdblock
+       
+       PART="${PART##mtd}"
+       [ -d /dev/mtdblock ] && PREFIX=/dev/mtdblock/
+       echo "${PART:+$PREFIX$PART}"
+}
+
+jffs2_ready () {
+    mtdpart="$(find_mtd_part rootfs_data)"
+    magic=$(hexdump $mtdpart -n 4 -e '4/1 "%02x"')
+    [ "$magic" != "deadc0de" ]
+}
+
+dupe() { # <new_root> <old_root>
+       cd $1
+       echo -n "creating directories... "
+       {
+               cd $2 
+               find . -xdev -type d
+               echo "./dev ./jffs ./mnt ./proc ./tmp"
+               # xdev skips mounted directories
+               cd $1 
+       } | xargs mkdir -p
+       echo "done"
+
+       echo -n "setting up symlinks... "
+       for file in $(cd $2; find . -xdev -type f;); do
+               case "$file" in
+               ./rom/note) ;; #nothing
+               ./etc/config*|\
+               ./usr/lib/opkg/info/*) cp -af $2/$file $file;;
+               *) ln -sf /rom/${file#./*} $file;;
+               esac
+       done
+       for file in $(cd $2; find . -xdev -type l;); do
+               cp -af $2/${file#./*} $file
+       done
+       echo "done"
+}
+
+pivot() { # <new_root> <old_root>
+       mount -o move /proc $1/proc && \
+       pivot_root $1 $1$2 && {
+               mount -o move $2/dev /dev
+               mount -o move $2/tmp /tmp
+               mount -o move $2/sys /sys 2>&-
+               mount -o move $2/jffs /jffs 2>&-
+               return 0
+       }
+}
+
+fopivot() { # <rw_root> <ro_root> <dupe?>
+       root=$1
+       {
+               if grep -q mini_fo /proc/filesystems; then
+                       mount -t mini_fo -o base=/,sto=$1 "mini_fo:$1" /mnt 2>&- && root=/mnt
+               else
+                       mount --bind / /mnt
+                       mount --bind -o union "$1" /mnt && root=/mnt 
+               fi
+       } || {
+               [ "$3" = "1" ] && {
+               mount | grep "on $1 type" 2>&- 1>&- || mount -o bind $1 $1
+               dupe $1 $rom
+               }
+       }
+       pivot $root $2
+}
+
+ramoverlay() {
+       mkdir -p /tmp/root
+       mount -t tmpfs root /tmp/root
+       fopivot /tmp/root /rom 1
+}