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
  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() {
 107         local from="$1"
 108
 109         case "$from" in
 110                 http://*|ftp://*) wget -O- -q "$from";;
 111                 *) cat "$from"
 112         esac
 113 }
 114
 115 get_magic_word() {
 116         get_image "$1" | dd bs=2 count=1 2>/dev/null | hexdump -C | awk '$2 { print $2 $3 }'
 117 }
 118
 119 refresh_mtd_partitions() {
 120         mtd refresh rootfs
 121 }
 122
 123 jffs2_copy_config() {
 124         if grep rootfs_data /proc/mtd >/dev/null; then
 125                 # squashfs+jffs2
 126                 mtd -e rootfs_data jffs2write "$CONF_TAR" rootfs_data
 127         else
 128                 # jffs2
 129                 mtd jffs2write "$CONF_TAR" rootfs
 130         fi
 131 }
 132
 133 default_do_upgrade() {
 134         if [ "$SAVE_CONFIG" -eq 1 -a -z "$USE_REFRESH" ]; then
 135                 get_image "$1" | mtd -j "$CONF_TAR" write - "${PART_NAME:-image}"
 136         else
 137                 get_image "$1" | mtd write - "${PART_NAME:-image}"
 138         fi
 139         sync
 140 }
 141
 142 do_upgrade() {
 143         v "Performing system upgrade..."
 144         if type 'platform_do_upgrade' >/dev/null 2>/dev/null; then
 145                 platform_do_upgrade "$ARGV"
 146         else
 147                 default_do_upgrade "$ARGV"
 148         fi
 149
 150         [ "$SAVE_CONFIG" -eq 1 -a -n "$USE_REFRESH" ] && {
 151                 v "Refreshing partitions"
 152                 if type 'platform_refresh_partitions' >/dev/null 2>/dev/null; then
 153                         platform_refresh_partitions
 154                 else
 155                         refresh_mtd_partitions
 156                 fi
 157                 if type 'platform_copy_config' >/dev/null 2>/dev/null; then
 158                         platform_copy_config
 159                 else
 160                         jffs2_copy_config
 161                 fi
 162         }
 163         [ -n "$DELAY" ] && sleep "$DELAY"
 164         ask_bool 1 "Reboot" && reboot
 165 }