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 run_hooks() {
  81         local arg="$1"; shift
  82         for func in "$@"; do
  83                 eval "$func $arg"
  84         done
  85 }
  86
  87 ask_bool() {
  88         local default="$1"; shift;
  89         local answer="$default"
  90
  91         [ "$INTERACTIVE" -eq 1 ] && {
  92                 case "$default" in
  93                         0) echo -n "$* (y/N): ";;
  94                         *) echo -n "$* (Y/n): ";;
  95                 esac
  96                 read answer
  97                 case "$answer" in
  98                         y*) answer=1;;
  99                         n*) answer=0;;
 100                         *) answer="$default";;
 101                 esac
 102         }
 103         [ "$answer" -gt 0 ]
 104 }
 105
 106 v() {
 107         [ "$VERBOSE" -ge 1 ] && echo "$@"
 108 }
 109
 110 rootfs_type() {
 111         mount | awk '($3 ~ /^\/$/) && ($5 !~ /rootfs/) { print $5 }'
 112 }
 113
 114 get_image() { # <source> [ <command> ]
 115         local from="$1"
 116         local conc="$2"
 117         local cmd
 118
 119         case "$from" in
 120                 http://*|ftp://*) cmd="wget -O- -q";;
 121                 *) cmd="cat";;
 122         esac
 123         if [ -z "$conc" ]; then
 124                 local magic="$(eval $cmd $from | dd bs=2 count=1 2>/dev/null | hexdump -n 2 -e '1/1 "%02x"')"
 125                 case "$magic" in
 126                         1f8b) conc="zcat";;
 127                         425a) conc="bzcat";;
 128                 esac
 129         fi
 130
 131         eval "$cmd $from ${conc:+| $conc}"
 132 }
 133
 134 get_magic_word() {
 135         get_image "$@" | dd bs=2 count=1 2>/dev/null | hexdump -v -n 2 -e '1/1 "%02x"'
 136 }
 137
 138 get_magic_long() {
 139         get_image "$@" | dd bs=4 count=1 2>/dev/null | hexdump -v -n 4 -e '1/1 "%02x"'
 140 }
 141
 142 refresh_mtd_partitions() {
 143         mtd refresh rootfs
 144 }
 145
 146 jffs2_copy_config() {
 147         if grep rootfs_data /proc/mtd >/dev/null; then
 148                 # squashfs+jffs2
 149                 mtd -e rootfs_data jffs2write "$CONF_TAR" rootfs_data
 150         else
 151                 # jffs2
 152                 mtd jffs2write "$CONF_TAR" rootfs
 153         fi
 154 }
 155
 156 default_do_upgrade() {
 157         sync
 158         if [ "$SAVE_CONFIG" -eq 1 -a -z "$USE_REFRESH" ]; then
 159                 get_image "$1" | mtd -j "$CONF_TAR" write - "${PART_NAME:-image}"
 160         else
 161                 get_image "$1" | mtd write - "${PART_NAME:-image}"
 162         fi
 163 }
 164
 165 do_upgrade() {
 166         v "Performing system upgrade..."
 167         if type 'platform_do_upgrade' >/dev/null 2>/dev/null; then
 168                 platform_do_upgrade "$ARGV"
 169         else
 170                 default_do_upgrade "$ARGV"
 171         fi
 172
 173         [ "$SAVE_CONFIG" -eq 1 -a -n "$USE_REFRESH" ] && {
 174                 v "Refreshing partitions"
 175                 if type 'platform_refresh_partitions' >/dev/null 2>/dev/null; then
 176                         platform_refresh_partitions
 177                 else
 178                         refresh_mtd_partitions
 179                 fi
 180                 if type 'platform_copy_config' >/dev/null 2>/dev/null; then
 181                         platform_copy_config
 182                 else
 183                         jffs2_copy_config
 184                 fi
 185         }
 186         v "Upgrade completed"
 187         [ -n "$DELAY" ] && sleep "$DELAY"
 188         ask_bool 1 "Reboot" && {
 189                 v "Rebooting system..."
 190                 reboot -f
 191                 sleep 5
 192                 echo b 2>/dev/null >/proc/sysrq-trigger
 193         }
 194 }