1 files changed, 137 insertions, 0 deletions
diff --git a/package/base-files/files/lib/functions.sh b/package/base-files/files/lib/functions.sh
index db59706bc5..54e69b8332 100755
--- a/package/base-files/files/lib/functions.sh
+++ b/package/base-files/files/lib/functions.sh
@@ -348,4 +348,141 @@ pi_include() {
 	return 0
 }
 
+#!/bin/sh
+# Copyright (C) 2006-2010 OpenWrt.org
+# Copyright (C) 2010 Vertical Communications
+
+boot_hook_splice_start() {
+	export -n PI_HOOK_SPLICE=1
+}
+
+boot_hook_splice_finish() {
+	local hook
+	for hook in $PI_STACK_LIST; do
+		local v; eval "v=\${${hook}_splice:+\$${hook}_splice }$hook"
+		export -n "${hook}=${v% }"
+		export -n "${hook}_splice="
+	done
+	export -n PI_HOOK_SPLICE=
+}
+
+boot_hook_init() {
+	local hook="${1}_hook"
+	export -n "PI_STACK_LIST=${PI_STACK_LIST:+$PI_STACK_LIST }$hook"
+	export -n "$hook="
+}
+
+boot_hook_add() {
+	local hook="${1}_hook${PI_HOOK_SPLICE:+_splice}"
+	local func="${2}"
+
+	[ -n "$func" ] && {
+		local v; eval "v=\$$hook"
+		export -n "$hook=${v:+$v }$func"
+	}
+}
+
+boot_hook_shift() {
+	local hook="${1}_hook"
+	local rvar="${2}"
+
+	local v; eval "v=\$$hook"
+	[ -n "$v" ] && {
+		local first="${v%% *}"
+
+		[ "$v" != "${v#* }" ] && \
+			export -n "$hook=${v#* }" || \
+			export -n "$hook="
+
+		export -n "$rvar=$first"
+		return 0
+	}
+
+	return 1
+}
+
+boot_run_hook() {
+	local hook="$1"
+	local func
+
+	while boot_hook_shift "$hook" func; do
+		local ran; eval "ran=\$PI_RAN_$func"
+		[ -n "$ran" ] || {
+			export -n "PI_RAN_$func=1"
+			$func "$1" "$2"
+		}
+	done
+}
+
+jffs2_ready () {
+	mtdpart="$(find_mtd_part rootfs_data)"
+	[ -z "$mtdpart" ] && return 1
+	magic=$(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 ./overlay ./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 noatime,move /proc $1/proc && \
+	pivot_root $1 $1$2 && {
+		mount -o noatime,move $2/dev /dev
+		mount -o noatime,move $2/tmp /tmp
+		mount -o noatime,move $2/sys /sys 2>&-
+		mount -o noatime,move $2/overlay /overlay 2>&-
+		return 0
+	}
+}
+
+fopivot() { # <rw_root> <ro_root> <dupe?>
+	root=$1
+	{
+		if grep -q overlay /proc/filesystems; then
+			mount -o noatime,lowerdir=/,upperdir=$1 -t overlayfs "overlayfs:$1" /mnt && root=/mnt
+		elif grep -q mini_fo /proc/filesystems; then
+			mount -t mini_fo -o noatime,base=/,sto=$1 "mini_fo:$1" /mnt 2>&- && root=/mnt
+		else
+			mount --bind -o noatime / /mnt
+			mount --bind -o noatime,union "$1" /mnt && root=/mnt
+		fi
+	} || {
+		[ "$3" = "1" ] && {
+		mount | grep "on $1 type" 2>&- 1>&- || mount -o noatime,bind $1 $1
+		dupe $1 $rom
+		}
+	}
+	pivot $root $2
+}
+
+ramoverlay() {
+	mkdir -p /tmp/root
+	mount -t tmpfs -o noatime,mode=0755 root /tmp/root
+	fopivot /tmp/root /rom 1
+}
+
 [ -z "$IPKG_INSTROOT" -a -f /lib/config/uci.sh ] && . /lib/config/uci.sh