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 /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
  52         install_bin /sbin/mtd
  53         for file in $RAMFS_COPY_BIN; do
  54                 install_bin $file
  55         done
  56         install_file /etc/resolv.conf /etc/functions.sh /lib/upgrade/*.sh $RAMFS_COPY_DATA
  57
  58         pivot $RAM_ROOT /mnt || {
  59                 echo "Failed to switch over to ramfs. Please reboot."
  60                 exit 1
  61         }
  62
  63         mount -o remount,ro /mnt
  64         umount -l /mnt
  65
  66         grep /overlay /proc/mounts > /dev/null && {
  67                 mount -o remount,ro /overlay
  68                 umount -l /overlay
  69         }
  70
  71         # spawn a new shell from ramdisk to reduce the probability of cache issues
  72         exec /bin/busybox ash -c "$*"
  73 }
  74
  75 run_hooks() {
  76         local arg="$1"; shift
  77         for func in "$@"; do
  78                 eval "$func $arg"
  79         done
  80 }
  81
  82 ask_bool() {
  83         local default="$1"; shift;
  84         local answer="$default"
  85
  86         [ "$INTERACTIVE" -eq 1 ] && {
  87                 case "$default" in
  88                         0) echo -n "$* (y/N): ";;
  89                         *) echo -n "$* (Y/n): ";;
  90                 esac
  91                 read answer
  92                 case "$answer" in
  93                         y*) answer=1;;
  94                         n*) answer=0;;
  95                         *) answer="$default";;
  96                 esac
  97         }
  98         [ "$answer" -gt 0 ]
  99 }
 100
 101 v() {
 102         [ "$VERBOSE" -ge 1 ] && echo "$@"
 103 }
 104
 105 rootfs_type() {
 106         mount | awk '($3 ~ /^\/$/) && ($5 !~ /rootfs/) { print $5 }'
 107 }
 108
 109 get_image() { # <source> [ <command> ]
 110         local from="$1"
 111         local conc="$2"
 112         local cmd
 113
 114         case "$from" in
 115                 http://*|ftp://*) cmd="wget -O- -q";;
 116                 *) cmd="cat";;
 117         esac
 118         if [ -z "$conc" ]; then
 119                 local magic="$(eval $cmd $from | dd bs=2 count=1 2>/dev/null | hexdump -n 2 -e '1/1 "%02x"')"
 120                 case "$magic" in
 121                         1f8b) conc="zcat";;
 122                         425a) conc="bzcat";;
 123                 esac
 124         fi
 125
 126         eval "$cmd $from ${conc:+| $conc}"
 127 }
 128
 129 get_magic_word() {
 130         get_image "$@" | dd bs=2 count=1 2>/dev/null | hexdump -v -n 2 -e '1/1 "%02x"'
 131 }
 132
 133 refresh_mtd_partitions() {
 134         mtd refresh rootfs
 135 }
 136
 137 jffs2_copy_config() {
 138         if grep rootfs_data /proc/mtd >/dev/null; then
 139                 # squashfs+jffs2
 140                 mtd -e rootfs_data jffs2write "$CONF_TAR" rootfs_data
 141         else
 142                 # jffs2
 143                 mtd jffs2write "$CONF_TAR" rootfs
 144         fi
 145 }
 146
 147 default_do_upgrade() {
 148         sync
 149         if [ "$SAVE_CONFIG" -eq 1 -a -z "$USE_REFRESH" ]; then
 150                 get_image "$1" | mtd -j "$CONF_TAR" write - "${PART_NAME:-image}"
 151         else
 152                 get_image "$1" | mtd write - "${PART_NAME:-image}"
 153         fi
 154 }
 155
 156 do_upgrade() {
 157         v "Performing system upgrade..."
 158         if type 'platform_do_upgrade' >/dev/null 2>/dev/null; then
 159                 platform_do_upgrade "$ARGV"
 160         else
 161                 default_do_upgrade "$ARGV"
 162         fi
 163
 164         [ "$SAVE_CONFIG" -eq 1 -a -n "$USE_REFRESH" ] && {
 165                 v "Refreshing partitions"
 166                 if type 'platform_refresh_partitions' >/dev/null 2>/dev/null; then
 167                         platform_refresh_partitions
 168                 else
 169                         refresh_mtd_partitions
 170                 fi
 171                 if type 'platform_copy_config' >/dev/null 2>/dev/null; then
 172                         platform_copy_config
 173                 else
 174                         jffs2_copy_config
 175                 fi
 176         }
 177         v "Upgrade completed"
 178         [ -n "$DELAY" ] && sleep "$DELAY"
 179         ask_bool 1 "Reboot" && {
 180                 v "Rebooting system..."
 181                 reboot
 182                 sleep 5
 183                 echo b 2>/dev/null >/proc/sysrq-trigger
 184         }
 185 }