x86: preserve partition table on sysupgrade
[openwrt.git] / package / base-files / files / lib / upgrade / common.sh
1 #!/bin/sh
2
3 RAM_ROOT=/tmp/root
4
5 [ -x /usr/bin/ldd ] || ldd() { LD_TRACE_LOADED_OBJECTS=1 $*; }
6 libs() { ldd $* 2>/dev/null | sed -r 's/(.* => )?(.*) .*/\2/'; }
7
8 install_file() { # <file> [ <file> ... ]
9         for file in "$@"; do
10                 dest="$RAM_ROOT/$file"
11                 [ -f $file -a ! -f $dest ] && {
12                         dir="$(dirname $dest)"
13                         mkdir -p "$dir"
14                         cp $file $dest
15                 }
16         done
17 }
18
19 install_bin() { # <file> [ <symlink> ... ]
20         src=$1
21         files=$1
22         [ -x "$src" ] && files="$src $(libs $src)"
23         install_file $files
24         shift
25         for link in "$@"; do {
26                 dest="$RAM_ROOT/$link"
27                 dir="$(dirname $dest)"
28                 mkdir -p "$dir"
29                 [ -f "$dest" ] || ln -s $src $dest
30         }; done
31 }
32
33 supivot() { # <new_root> <old_root>
34         /bin/mount | grep "on $1 type" 2>&- 1>&- || /bin/mount -o bind $1 $1
35         mkdir -p $1$2 $1/proc $1/sys $1/dev $1/tmp $1/overlay && \
36         /bin/mount -o noatime,move /proc $1/proc && \
37         pivot_root $1 $1$2 || {
38                 /bin/umount -l $1 $1
39                 return 1
40         }
41
42         /bin/mount -o noatime,move $2/sys /sys
43         /bin/mount -o noatime,move $2/dev /dev
44         /bin/mount -o noatime,move $2/tmp /tmp
45         /bin/mount -o noatime,move $2/overlay /overlay 2>&-
46         return 0
47 }
48
49 run_ramfs() { # <command> [...]
50         install_bin /bin/busybox /bin/ash /bin/sh /bin/mount /bin/umount        \
51                 /sbin/pivot_root /sbin/reboot /bin/sync /bin/dd /bin/grep       \
52                 /bin/cp /bin/mv /bin/tar /usr/bin/md5sum "/usr/bin/[" /bin/dd   \
53                 /bin/vi /bin/ls /bin/cat /usr/bin/awk /usr/bin/hexdump          \
54                 /bin/sleep /bin/zcat /usr/bin/bzcat /usr/bin/printf /usr/bin/wc \
55                 /bin/cut /usr/bin/printf /bin/sync /bin/mkdir /bin/rmdir        \
56                 /bin/rm /usr/bin/basename /bin/kill /bin/chmod
57
58         install_bin /bin/uclient-fetch /bin/wget
59         install_bin /sbin/mtd
60         install_bin /sbin/mount_root
61         install_bin /sbin/snapshot
62         install_bin /sbin/snapshot_tool
63         install_bin /usr/sbin/ubiupdatevol
64         install_bin /usr/sbin/ubiattach
65         install_bin /usr/sbin/ubiblock
66         install_bin /usr/sbin/ubiformat
67         install_bin /usr/sbin/ubidetach
68         install_bin /usr/sbin/ubirsvol
69         install_bin /usr/sbin/ubirmvol
70         install_bin /usr/sbin/ubimkvol
71         install_bin /usr/sbin/partx
72         for file in $RAMFS_COPY_BIN; do
73                 install_bin ${file//:/ }
74         done
75         install_file /etc/resolv.conf /lib/*.sh /lib/functions/*.sh /lib/upgrade/*.sh $RAMFS_COPY_DATA
76
77         [ -L "/lib64" ] && ln -s /lib $RAM_ROOT/lib64
78
79         supivot $RAM_ROOT /mnt || {
80                 echo "Failed to switch over to ramfs. Please reboot."
81                 exit 1
82         }
83
84         /bin/mount -o remount,ro /mnt
85         /bin/umount -l /mnt
86
87         grep /overlay /proc/mounts > /dev/null && {
88                 /bin/mount -o noatime,remount,ro /overlay
89                 /bin/umount -l /overlay
90         }
91
92         # spawn a new shell from ramdisk to reduce the probability of cache issues
93         exec /bin/busybox ash -c "$*"
94 }
95
96 kill_remaining() { # [ <signal> ]
97         local sig="${1:-TERM}"
98         echo -n "Sending $sig to remaining processes ... "
99
100         local my_pid=$$
101         local my_ppid=$(cut -d' ' -f4  /proc/$my_pid/stat)
102         local my_ppisupgraded=
103         grep -q upgraded /proc/$my_ppid/cmdline >/dev/null && {
104                 local my_ppisupgraded=1
105         }
106         
107         local stat
108         for stat in /proc/[0-9]*/stat; do
109                 [ -f "$stat" ] || continue
110
111                 local pid name state ppid rest
112                 read pid name state ppid rest < $stat
113                 name="${name#(}"; name="${name%)}"
114
115                 local cmdline
116                 read cmdline < /proc/$pid/cmdline
117
118                 # Skip kernel threads
119                 [ -n "$cmdline" ] || continue
120
121                 if [ $$ -eq 1 ] || [ $my_ppid -eq 1 ] && [ -n "$my_ppisupgraded" ]; then
122                         # Running as init process, kill everything except me
123                         if [ $pid -ne $$ ] && [ $pid -ne $my_ppid ]; then
124                                 echo -n "$name "
125                                 kill -$sig $pid 2>/dev/null
126                         fi
127                 else 
128                         case "$name" in
129                                 # Skip essential services
130                                 *procd*|*ash*|*init*|*watchdog*|*ssh*|*dropbear*|*telnet*|*login*|*hostapd*|*wpa_supplicant*|*nas*) : ;;
131
132                                 # Killable process
133                                 *)
134                                         if [ $pid -ne $$ ] && [ $ppid -ne $$ ]; then
135                                                 echo -n "$name "
136                                                 kill -$sig $pid 2>/dev/null
137                                         fi
138                                 ;;
139                         esac
140                 fi
141         done
142         echo ""
143 }
144
145 run_hooks() {
146         local arg="$1"; shift
147         for func in "$@"; do
148                 eval "$func $arg"
149         done
150 }
151
152 ask_bool() {
153         local default="$1"; shift;
154         local answer="$default"
155
156         [ "$INTERACTIVE" -eq 1 ] && {
157                 case "$default" in
158                         0) echo -n "$* (y/N): ";;
159                         *) echo -n "$* (Y/n): ";;
160                 esac
161                 read answer
162                 case "$answer" in
163                         y*) answer=1;;
164                         n*) answer=0;;
165                         *) answer="$default";;
166                 esac
167         }
168         [ "$answer" -gt 0 ]
169 }
170
171 v() {
172         [ "$VERBOSE" -ge 1 ] && echo "$@"
173 }
174
175 rootfs_type() {
176         /bin/mount | awk '($3 ~ /^\/$/) && ($5 !~ /rootfs/) { print $5 }'
177 }
178
179 get_image() { # <source> [ <command> ]
180         local from="$1"
181         local conc="$2"
182         local cmd
183
184         case "$from" in
185                 http://*|ftp://*) cmd="wget -O- -q";;
186                 *) cmd="cat";;
187         esac
188         if [ -z "$conc" ]; then
189                 local magic="$(eval $cmd \"$from\" 2>/dev/null | dd bs=2 count=1 2>/dev/null | hexdump -n 2 -e '1/1 "%02x"')"
190                 case "$magic" in
191                         1f8b) conc="zcat";;
192                         425a) conc="bzcat";;
193                 esac
194         fi
195
196         eval "$cmd \"$from\" 2>/dev/null ${conc:+| $conc}"
197 }
198
199 get_magic_word() {
200         (get_image "$@" | dd bs=2 count=1 | hexdump -v -n 2 -e '1/1 "%02x"') 2>/dev/null
201 }
202
203 get_magic_long() {
204         (get_image "$@" | dd bs=4 count=1 | hexdump -v -n 4 -e '1/1 "%02x"') 2>/dev/null
205 }
206
207 jffs2_copy_config() {
208         if grep rootfs_data /proc/mtd >/dev/null; then
209                 # squashfs+jffs2
210                 mtd -e rootfs_data jffs2write "$CONF_TAR" rootfs_data
211         else
212                 # jffs2
213                 mtd jffs2write "$CONF_TAR" rootfs
214         fi
215 }
216
217 # Flash firmware to MTD partition
218 #
219 # $(1): path to image
220 # $(2): (optional) pipe command to extract firmware, e.g. dd bs=n skip=m
221 default_do_upgrade() {
222         sync
223         if [ "$SAVE_CONFIG" -eq 1 ]; then
224                 get_image "$1" "$2" | mtd $MTD_CONFIG_ARGS -j "$CONF_TAR" write - "${PART_NAME:-image}"
225         else
226                 get_image "$1" "$2" | mtd write - "${PART_NAME:-image}"
227         fi
228 }
229
230 do_upgrade() {
231         v "Performing system upgrade..."
232         if type 'platform_do_upgrade' >/dev/null 2>/dev/null; then
233                 platform_do_upgrade "$ARGV"
234         else
235                 default_do_upgrade "$ARGV"
236         fi
237
238         if [ "$SAVE_CONFIG" -eq 1 ] && type 'platform_copy_config' >/dev/null 2>/dev/null; then
239                 platform_copy_config
240         fi
241
242         v "Upgrade completed"
243         [ -n "$DELAY" ] && sleep "$DELAY"
244         ask_bool 1 "Reboot" && {
245                 v "Rebooting system..."
246                 reboot -f
247                 sleep 5
248                 echo b 2>/dev/null >/proc/sysrq-trigger
249         }
250 }