[package] base-files: fix sysupgrade get_magic_word() function to return proper value...
[openwrt.git] / package / base-files / files / lib / upgrade / common.sh
1 #!/bin/sh
2
3 RAM_ROOT=/tmp/root
4
5 ldd() { LD_TRACE_LOADED_OBJECTS=1 $*; }
6 libs() { ldd $* | awk '{print $3}'; }
7
8 install_file() { # <file> [ <file> ... ]
9         for file in "$@"; 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 pivot() { # <new_root> <old_root>
34         mount | grep "on $1 type" 2>&- 1>&- || mount -o bind $1 $1
35         mkdir -p $1$2 $1/proc $1/dev $1/tmp $1/jffs && \
36         mount -o move /proc $1/proc && \
37         pivot_root $1 $1$2 || {
38         umount $1 $1
39                 return 1
40         }
41         mount -o move $2/dev /dev
42         mount -o move $2/tmp /tmp
43         mount -o move $2/jffs /jffs 2>&-
44         return 0
45 }
46
47 run_ramfs() { # <command> [...]
48         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
49         install_bin /sbin/mtd
50         for file in $RAMFS_COPY_BIN; do
51                 install_bin $file
52         done
53         install_file /etc/resolv.conf /etc/functions.sh /lib/upgrade/*.sh $RAMFS_COPY_DATA
54
55         pivot $RAM_ROOT /mnt || {
56                 echo "Failed to switch over to ramfs. Please reboot."
57                 exit 1
58         }
59
60         mount -o remount,ro /mnt
61         umount -l /mnt
62
63         grep /jffs /proc/mounts > /dev/null && {
64                 mount -o remount,ro /jffs
65                 umount -l /jffs
66         }
67
68         # spawn a new shell from ramdisk to reduce the probability of cache issues
69         exec /bin/busybox ash -c "$*"
70 }
71
72 run_hooks() {
73         local arg="$1"; shift
74         for func in "$@"; do
75                 eval "$func $arg"
76         done
77 }
78
79 ask_bool() {
80         local default="$1"; shift;
81         local answer="$default"
82
83         [ "$INTERACTIVE" -eq 1 ] && {
84                 case "$default" in
85                         0) echo -n "$* (y/N): ";;
86                         *) echo -n "$* (Y/n): ";;
87                 esac
88                 read answer
89                 case "$answer" in
90                         y*) answer=1;;
91                         n*) answer=0;;
92                         *) answer="$default";;
93                 esac
94         }
95         [ "$answer" -gt 0 ]
96 }
97
98 v() {
99         [ "$VERBOSE" -ge 1 ] && echo "$@"
100 }
101
102 rootfs_type() {
103         mount | awk '($3 ~ /^\/$/) && ($5 !~ /rootfs/) { print $5 }'
104 }
105
106 get_image() { # <source> [ <command> ]
107         local from="$1"
108         local conc="$2"
109         local cmd
110
111         case "$from" in
112                 http://*|ftp://*) cmd="wget -O- -q";;
113                 *) cmd="cat";;
114         esac
115         if [ -z "$conc" ]; then
116                 local magic="$(eval $cmd $from | dd bs=2 count=1 2>/dev/null | hexdump -n 2 -e '1/1 "%02x"')"
117                 case "$magic" in
118                         1f8b) conc="zcat";;
119                         425a) conc="bzcat";;
120                 esac
121         fi
122
123         eval "$cmd $from ${conc:+| $conc}"
124 }
125
126 get_magic_word() {
127         get_image "$@" | dd bs=2 count=1 2>/dev/null | hexdump -v -n 2 -e '1/1 "%02x"'
128 }
129
130 refresh_mtd_partitions() {
131         mtd refresh rootfs
132 }
133
134 jffs2_copy_config() {
135         if grep rootfs_data /proc/mtd >/dev/null; then
136                 # squashfs+jffs2
137                 mtd -e rootfs_data jffs2write "$CONF_TAR" rootfs_data
138         else
139                 # jffs2
140                 mtd jffs2write "$CONF_TAR" rootfs
141         fi
142 }
143
144 default_do_upgrade() {
145         sync
146         if [ "$SAVE_CONFIG" -eq 1 -a -z "$USE_REFRESH" ]; then
147                 get_image "$1" | mtd -j "$CONF_TAR" write - "${PART_NAME:-image}"
148         else
149                 get_image "$1" | mtd write - "${PART_NAME:-image}"
150         fi
151 }
152
153 do_upgrade() {
154         v "Performing system upgrade..."
155         if type 'platform_do_upgrade' >/dev/null 2>/dev/null; then
156                 platform_do_upgrade "$ARGV"
157         else
158                 default_do_upgrade "$ARGV"
159         fi
160
161         [ "$SAVE_CONFIG" -eq 1 -a -n "$USE_REFRESH" ] && {
162                 v "Refreshing partitions"
163                 if type 'platform_refresh_partitions' >/dev/null 2>/dev/null; then
164                         platform_refresh_partitions
165                 else
166                         refresh_mtd_partitions
167                 fi
168                 if type 'platform_copy_config' >/dev/null 2>/dev/null; then
169                         platform_copy_config
170                 else
171                         jffs2_copy_config
172                 fi
173         }
174         v "Upgrade completed"
175         [ -n "$DELAY" ] && sleep "$DELAY"
176         ask_bool 1 "Reboot" && {
177                 v "Rebooting system..."
178                 reboot
179                 sleep 5
180                 echo b 2>/dev/null >/proc/sysrq-trigger
181         }
182 }