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 $files
  24         [ -e /lib/ld-linux.so.3 ] && {
  25                 install_file /lib/ld-linux.so.3
  26         }
  27         shift
  28         for link in "$@"; do {
  29                 dest="$RAM_ROOT/$link"
  30                 dir="$(dirname $dest)"
  31                 mkdir -p "$dir"
  32                 [ -f "$dest" ] || ln -s $src $dest
  33         }; done
  34 }
  35
  36 pivot() { # <new_root> <old_root>
  37         mount | grep "on $1 type" 2>&- 1>&- || mount -o bind $1 $1
  38         mkdir -p $1$2 $1/proc $1/dev $1/tmp $1/overlay && \
  39         mount -o move /proc $1/proc && \
  40         pivot_root $1 $1$2 || {
  41         umount $1 $1
  42                 return 1
  43         }
  44         mount -o move $2/dev /dev
  45         mount -o move $2/tmp /tmp
  46         mount -o move $2/overlay /overlay 2>&-
  47         return 0
  48 }
  49
  50 run_ramfs() { # <command> [...]
  51         install_bin /bin/busybox /bin/ash /bin/sh /bin/mount /bin/umount        \
  52                 /sbin/pivot_root /usr/bin/wget /sbin/reboot /bin/sync /bin/dd   \
  53                 /bin/grep /bin/cp /bin/mv /bin/tar /usr/bin/md5sum "/usr/bin/[" \
  54                 /bin/vi /bin/ls /bin/cat /usr/bin/awk /usr/bin/hexdump          \
  55                 /bin/sleep /bin/zcat /usr/bin/bzcat /usr/bin/printf /usr/bin/wc
  56
  57         install_bin /sbin/mtd
  58         for file in $RAMFS_COPY_BIN; do
  59                 install_bin $file
  60         done
  61         install_file /etc/resolv.conf /etc/functions.sh /lib/upgrade/*.sh $RAMFS_COPY_DATA
  62
  63         pivot $RAM_ROOT /mnt || {
  64                 echo "Failed to switch over to ramfs. Please reboot."
  65                 exit 1
  66         }
  67
  68         mount -o remount,ro /mnt
  69         umount -l /mnt
  70
  71         grep /overlay /proc/mounts > /dev/null && {
  72                 mount -o remount,ro /overlay
  73                 umount -l /overlay
  74         }
  75
  76         # spawn a new shell from ramdisk to reduce the probability of cache issues
  77         exec /bin/busybox ash -c "$*"
  78 }
  79
  80 kill_remaining() { # [ <signal> ]
  81         local sig="${1:-TERM}"
  82         echo -n "Sending $sig to remaining processes ... "
  83
  84         local stat
  85         for stat in /proc/[0-9]*/stat; do
  86                 local pid name state ppid rest
  87                 read pid name state ppid rest < $stat
  88                 name="${name#(}"; name="${name%)}"
  89
  90                 local cmdline
  91                 read cmdline < /proc/$pid/cmdline
  92
  93                 # Skip kernel threads
  94                 [ -n "$cmdline" ] || continue
  95
  96                 case "$name" in
  97                         # Skip essential services
  98                         *ash*|*init*|*watchdog*|*ssh*|*dropbear*|*telnet*|*login*|*ubusd*|*netifd*|*hostapd*|*wpa_supplicant*|*udhcpc*) : ;;
  99
 100                         # Killable process
 101                         *)
 102                                 if [ $pid -ne $$ ] && [ $ppid -ne $$ ]; then
 103                                         echo -n "$name "
 104                                         kill -$sig $pid 2>/dev/null
 105                                 fi
 106                         ;;
 107                 esac
 108         done
 109         echo ""
 110 }
 111
 112 run_hooks() {
 113         local arg="$1"; shift
 114         for func in "$@"; do
 115                 eval "$func $arg"
 116         done
 117 }
 118
 119 ask_bool() {
 120         local default="$1"; shift;
 121         local answer="$default"
 122
 123         [ "$INTERACTIVE" -eq 1 ] && {
 124                 case "$default" in
 125                         0) echo -n "$* (y/N): ";;
 126                         *) echo -n "$* (Y/n): ";;
 127                 esac
 128                 read answer
 129                 case "$answer" in
 130                         y*) answer=1;;
 131                         n*) answer=0;;
 132                         *) answer="$default";;
 133                 esac
 134         }
 135         [ "$answer" -gt 0 ]
 136 }
 137
 138 v() {
 139         [ "$VERBOSE" -ge 1 ] && echo "$@"
 140 }
 141
 142 rootfs_type() {
 143         mount | awk '($3 ~ /^\/$/) && ($5 !~ /rootfs/) { print $5 }'
 144 }
 145
 146 get_image() { # <source> [ <command> ]
 147         local from="$1"
 148         local conc="$2"
 149         local cmd
 150
 151         case "$from" in
 152                 http://*|ftp://*) cmd="wget -O- -q";;
 153                 *) cmd="cat";;
 154         esac
 155         if [ -z "$conc" ]; then
 156                 local magic="$(eval $cmd $from | dd bs=2 count=1 2>/dev/null | hexdump -n 2 -e '1/1 "%02x"')"
 157                 case "$magic" in
 158                         1f8b) conc="zcat";;
 159                         425a) conc="bzcat";;
 160                 esac
 161         fi
 162
 163         eval "$cmd $from ${conc:+| $conc}"
 164 }
 165
 166 get_magic_word() {
 167         get_image "$@" | dd bs=2 count=1 2>/dev/null | hexdump -v -n 2 -e '1/1 "%02x"'
 168 }
 169
 170 get_magic_long() {
 171         get_image "$@" | dd bs=4 count=1 2>/dev/null | hexdump -v -n 4 -e '1/1 "%02x"'
 172 }
 173
 174 refresh_mtd_partitions() {
 175         mtd refresh rootfs
 176 }
 177
 178 jffs2_copy_config() {
 179         if grep rootfs_data /proc/mtd >/dev/null; then
 180                 # squashfs+jffs2
 181                 mtd -e rootfs_data jffs2write "$CONF_TAR" rootfs_data
 182         else
 183                 # jffs2
 184                 mtd jffs2write "$CONF_TAR" rootfs
 185         fi
 186 }
 187
 188 default_do_upgrade() {
 189         sync
 190         if [ "$SAVE_CONFIG" -eq 1 -a -z "$USE_REFRESH" ]; then
 191                 get_image "$1" | mtd -j "$CONF_TAR" write - "${PART_NAME:-image}"
 192         else
 193                 get_image "$1" | mtd write - "${PART_NAME:-image}"
 194         fi
 195 }
 196
 197 do_upgrade() {
 198         v "Performing system upgrade..."
 199         if type 'platform_do_upgrade' >/dev/null 2>/dev/null; then
 200                 platform_do_upgrade "$ARGV"
 201         else
 202                 default_do_upgrade "$ARGV"
 203         fi
 204
 205         [ "$SAVE_CONFIG" -eq 1 -a -n "$USE_REFRESH" ] && {
 206                 v "Refreshing partitions"
 207                 if type 'platform_refresh_partitions' >/dev/null 2>/dev/null; then
 208                         platform_refresh_partitions
 209                 else
 210                         refresh_mtd_partitions
 211                 fi
 212                 if type 'platform_copy_config' >/dev/null 2>/dev/null; then
 213                         platform_copy_config
 214                 else
 215                         jffs2_copy_config
 216                 fi
 217         }
 218         v "Upgrade completed"
 219         [ -n "$DELAY" ] && sleep "$DELAY"
 220         ask_bool 1 "Reboot" && {
 221                 v "Rebooting system..."
 222                 reboot -f
 223                 sleep 5
 224                 echo b 2>/dev/null >/proc/sysrq-trigger
 225         }
 226 }