1#!/bin/sh
2# Copyright (C) 2006-2010 OpenWrt.org
3# Copyright (C) 2010 Vertical Communications
4
5mount() {
6	/bin/busybox mount -o noatime "$@"
7}
8
9boot_hook_splice_start() {
10	export -n PI_HOOK_SPLICE=1
11}
12
13boot_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
23boot_hook_init() {
24	local hook="${1}_hook"
25	export -n "PI_STACK_LIST=${PI_STACK_LIST:+$PI_STACK_LIST }$hook"
26	export -n "$hook="
27}
28
29boot_hook_add() {
30	local hook="${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
39boot_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
58boot_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" "$2"
67		}
68	done
69}
70
71find_mtd_part() {
72	local PART="$(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$PART}"
78}
79
80jffs2_ready () {
81	mtdpart="$(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
87dupe() { # <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
114pivot() { # <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
125fopivot() { # <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
145ramoverlay() {
146	mkdir -p /tmp/root
147	mount -t tmpfs -o mode=0755 root /tmp/root
148	fopivot /tmp/root /rom 1
149}
150
151