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 $sig to remaining processes ... "
  83         /bin/busybox top -bn1 2>/dev/null | while read pid ppid user stat vsz pvsz pcpu cmd args; do
  84                 case "$pid" in
  85                         [0-9]*) : ;;
  86                         *) continue ;;
  87                 esac
  88                 case "$cmd" in
  89                         # Skip kernel threads and essential services
  90                         \[*\]|*ash*|*init*|*watchdog*|*ssh*|*dropbear*|*telnet*|*login*|*ubusd*|*netifd*|*hostapd*|*wpa_supplicant*|*udhcpc*) : ;;
  91
  92                         # Killable process
  93                         *)
  94                                 if [ $pid -ne $$ ] && [ $ppid -ne $$ ]; then
  95                                         echo -n "${cmd##*/} "
  96                                         kill -$sig $pid 2>/dev/null
  97                                 fi
  98                         ;;
  99                 esac
 100         done
 101         echo ""
 102 }
 103
 104 run_hooks() {
 105         local arg="$1"; shift
 106         for func in "$@"; do
 107                 eval "$func $arg"
 108         done
 109 }
 110
 111 ask_bool() {
 112         local default="$1"; shift;
 113         local answer="$default"
 114
 115         [ "$INTERACTIVE" -eq 1 ] && {
 116                 case "$default" in
 117                         0) echo -n "$* (y/N): ";;
 118                         *) echo -n "$* (Y/n): ";;
 119                 esac
 120                 read answer
 121                 case "$answer" in
 122                         y*) answer=1;;
 123                         n*) answer=0;;
 124                         *) answer="$default";;
 125                 esac
 126         }
 127         [ "$answer" -gt 0 ]
 128 }
 129
 130 v() {
 131         [ "$VERBOSE" -ge 1 ] && echo "$@"
 132 }
 133
 134 rootfs_type() {
 135         mount | awk '($3 ~ /^\/$/) && ($5 !~ /rootfs/) { print $5 }'
 136 }
 137
 138 get_image() { # <source> [ <command> ]
 139         local from="$1"
 140         local conc="$2"
 141         local cmd
 142
 143         case "$from" in
 144                 http://*|ftp://*) cmd="wget -O- -q";;
 145                 *) cmd="cat";;
 146         esac
 147         if [ -z "$conc" ]; then
 148                 local magic="$(eval $cmd $from | dd bs=2 count=1 2>/dev/null | hexdump -n 2 -e '1/1 "%02x"')"
 149                 case "$magic" in
 150                         1f8b) conc="zcat";;
 151                         425a) conc="bzcat";;
 152                 esac
 153         fi
 154
 155         eval "$cmd $from ${conc:+| $conc}"
 156 }
 157
 158 get_magic_word() {
 159         get_image "$@" | dd bs=2 count=1 2>/dev/null | hexdump -v -n 2 -e '1/1 "%02x"'
 160 }
 161
 162 get_magic_long() {
 163         get_image "$@" | dd bs=4 count=1 2>/dev/null | hexdump -v -n 4 -e '1/1 "%02x"'
 164 }
 165
 166 refresh_mtd_partitions() {
 167         mtd refresh rootfs
 168 }
 169
 170 jffs2_copy_config() {
 171         if grep rootfs_data /proc/mtd >/dev/null; then
 172                 # squashfs+jffs2
 173                 mtd -e rootfs_data jffs2write "$CONF_TAR" rootfs_data
 174         else
 175                 # jffs2
 176                 mtd jffs2write "$CONF_TAR" rootfs
 177         fi
 178 }
 179
 180 default_do_upgrade() {
 181         sync
 182         if [ "$SAVE_CONFIG" -eq 1 -a -z "$USE_REFRESH" ]; then
 183                 get_image "$1" | mtd -j "$CONF_TAR" write - "${PART_NAME:-image}"
 184         else
 185                 get_image "$1" | mtd write - "${PART_NAME:-image}"
 186         fi
 187 }
 188
 189 do_upgrade() {
 190         v "Performing system upgrade..."
 191         if type 'platform_do_upgrade' >/dev/null 2>/dev/null; then
 192                 platform_do_upgrade "$ARGV"
 193         else
 194                 default_do_upgrade "$ARGV"
 195         fi
 196
 197         [ "$SAVE_CONFIG" -eq 1 -a -n "$USE_REFRESH" ] && {
 198                 v "Refreshing partitions"
 199                 if type 'platform_refresh_partitions' >/dev/null 2>/dev/null; then
 200                         platform_refresh_partitions
 201                 else
 202                         refresh_mtd_partitions
 203                 fi
 204                 if type 'platform_copy_config' >/dev/null 2>/dev/null; then
 205                         platform_copy_config
 206                 else
 207                         jffs2_copy_config
 208                 fi
 209         }
 210         v "Upgrade completed"
 211         [ -n "$DELAY" ] && sleep "$DELAY"
 212         ask_bool 1 "Reboot" && {
 213                 v "Rebooting system..."
 214                 reboot -f
 215                 sleep 5
 216                 echo b 2>/dev/null >/proc/sysrq-trigger
 217         }
 218 }