aboutsummaryrefslogtreecommitdiffstats
path: root/package/base-files/files/lib/upgrade/common.sh
blob: 6122ae7712085015c8cdac3666c259ea187c4918 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
#!/bin/sh

RAM_ROOT=/tmp/root

ldd() { LD_TRACE_LOADED_OBJECTS=1 $*; }
libs() { ldd $* | awk '{print $3}'; }

install_file() { # <file> [ <file> ... ]
	for file in "$@"; do
		dest="$RAM_ROOT/$file"
		[ -f $file -a ! -f $dest ] && {
			dir="$(dirname $dest)"
			mkdir -p "$dir"
			cp $file $dest
		}
	done
}

install_bin() { # <file> [ <symlink> ... ]
	src=$1
	files=$1
	[ -x "$src" ] && files="$src $(libs $src)"
	install_file $files
	[ -e /lib/ld.so.1 ] && {
		install_file /lib/ld.so.1
	}
	shift
	for link in "$@"; do {
		dest="$RAM_ROOT/$link"
		dir="$(dirname $dest)"
		mkdir -p "$dir"
		[ -f "$dest" ] || ln -s $src $dest
	}; done
}

supivot() { # <new_root> <old_root>
	mount | grep "on $1 type" 2>&- 1>&- || mount -o bind $1 $1
	mkdir -p $1$2 $1/proc $1/sys $1/dev $1/tmp $1/overlay && \
	mount -o noatime,move /proc $1/proc && \
	pivot_root $1 $1$2 || {
        umount -l $1 $1
		return 1
	}

	mount -o noatime,move $2/sys /sys
	mount -o noatime,move $2/dev /dev
	mount -o noatime,move $2/tmp /tmp
	mount -o noatime,move $2/overlay /overlay 2>&-
	return 0
}

run_ramfs() { # <command> [...]
	install_bin /bin/busybox /bin/ash /bin/sh /bin/mount /bin/umount        \
		/sbin/pivot_root /usr/bin/wget /sbin/reboot /bin/sync /bin/dd   \
		/bin/grep /bin/cp /bin/mv /bin/tar /usr/bin/md5sum "/usr/bin/[" \
		/bin/vi /bin/ls /bin/cat /usr/bin/awk /usr/bin/hexdump          \
		/bin/sleep /bin/zcat /usr/bin/bzcat /usr/bin/printf /usr/bin/wc

	install_bin /sbin/mtd
	for file in $RAMFS_COPY_BIN; do
		install_bin $file
	done
	install_file /etc/resolv.conf /lib/functions.sh /lib/functions.sh /lib/upgrade/*.sh $RAMFS_COPY_DATA

	supivot $RAM_ROOT /mnt || {
		echo "Failed to switch over to ramfs. Please reboot."
		exit 1
	}

	mount -o remount,ro /mnt
	umount -l /mnt

	grep /overlay /proc/mounts > /dev/null && {
		mount -o noatime,remount,ro /overlay
		umount -l /overlay
	}

	# spawn a new shell from ramdisk to reduce the probability of cache issues
	exec /bin/busybox ash -c "$*"
}

kill_remaining() { # [ <signal> ]
	local sig="${1:-TERM}"
	echo -n "Sending $sig to remaining processes ... "

	local stat
	for stat in /proc/[0-9]*/stat; do
		[ -f "$stat" ] || continue

		local pid name state ppid rest
		read pid name state ppid rest < $stat
		name="${name#(}"; name="${name%)}"

		local cmdline
		read cmdline < /proc/$pid/cmdline

		# Skip kernel threads 
		[ -n "$cmdline" ] || continue

		case "$name" in
			# Skip essential services
			*procd*|*ash*|*init*|*watchdog*|*ssh*|*dropbear*|*telnet*|*login*|*hostapd*|*wpa_supplicant*|*nas*) : ;;

			# Killable process
			*)
				if [ $pid -ne $$ ] && [ $ppid -ne $$ ]; then
					echo -n "$name "
					kill -$sig $pid 2>/dev/null
				fi
			;;
		esac
	done
	echo ""
}

run_hooks() {
	local arg="$1"; shift
	for func in "$@"; do
		eval "$func $arg"
	done
}

ask_bool() {
	local default="$1"; shift;
	local answer="$default"

	[ "$INTERACTIVE" -eq 1 ] && {
		case "$default" in
			0) echo -n "$* (y/N): ";;
			*) echo -n "$* (Y/n): ";;
		esac
		read answer
		case "$answer" in
			y*) answer=1;;
			n*) answer=0;;
			*) answer="$default";;
		esac
	}
	[ "$answer" -gt 0 ]
}

v() {
	[ "$VERBOSE" -ge 1 ] && echo "$@"
}

rootfs_type() {
	mount | awk '($3 ~ /^\/$/) && ($5 !~ /rootfs/) { print $5 }'
}

get_image() { # <source> [ <command> ]
	local from="$1"
	local conc="$2"
	local cmd

	case "$from" in
		http://*|ftp://*) cmd="wget -O- -q";;
		*) cmd="cat";;
	esac
	if [ -z "$conc" ]; then
		local magic="$(eval $cmd $from 2>/dev/null | dd bs=2 count=1 2>/dev/null | hexdump -n 2 -e '1/1 "%02x"')"
		case "$magic" in
			1f8b) conc="zcat";;
			425a) conc="bzcat";;
		esac
	fi

	eval "$cmd $from 2>/dev/null ${conc:+| $conc}"
}

get_magic_word() {
	get_image "$@" | dd bs=2 count=1 2>/dev/null | hexdump -v -n 2 -e '1/1 "%02x"'
}

get_magic_long() {
	get_image "$@" | dd bs=4 count=1 2>/dev/null | hexdump -v -n 4 -e '1/1 "%02x"'
}

jffs2_copy_config() {
	if grep rootfs_data /proc/mtd >/dev/null; then
		# squashfs+jffs2
		mtd -e rootfs_data jffs2write "$CONF_TAR" rootfs_data
	else
		# jffs2
		mtd jffs2write "$CONF_TAR" rootfs
	fi
}

default_do_upgrade() {
	sync
	if [ "$SAVE_CONFIG" -eq 1 ]; then
		get_image "$1" | mtd $MTD_CONFIG_ARGS -j "$CONF_TAR" write - "${PART_NAME:-image}"
	else
		get_image "$1" | mtd write - "${PART_NAME:-image}"
	fi
}

do_upgrade() {
	v "Performing system upgrade..."
	if type 'platform_do_upgrade' >/dev/null 2>/dev/null; then
		platform_do_upgrade "$ARGV"
	else
		default_do_upgrade "$ARGV"
	fi

	if [ "$SAVE_CONFIG" -eq 1 ] && type 'platform_copy_config' >/dev/null 2>/dev/null; then
		platform_copy_config
	fi

	v "Upgrade completed"
	[ -n "$DELAY" ] && sleep "$DELAY"
	ask_bool 1 "Reboot" && {
		v "Rebooting system..."
		reboot -f
		sleep 5
		echo b 2>/dev/null >/proc/sysrq-trigger
	}
}