package/base-files/files/lib/upgrade/common.sh

   1 #!/bin/sh
   2
   3 RAM_ROOT=/tmp/root
   4
   5 [ -x /usr/bin/ldd ] || ldd() { LD_TRACE_LOADED_OBJECTS=1 $*; }
   6 libs() { ldd $* 2>/dev/null | sed -r 's/(.* => )?(.*) .*/\2/'; }
   7
   8 install_file() { # <file> [ <file> ... ]
   9         for file in "$@"; 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 supivot() { # <new_root> <old_root>
  34         /bin/mount | grep "on $1 type" 2>&- 1>&- || /bin/mount -o bind $1 $1
  35         mkdir -p $1$2 $1/proc $1/sys $1/dev $1/tmp $1/overlay && \
  36         /bin/mount -o noatime,move /proc $1/proc && \
  37         pivot_root $1 $1$2 || {
  38                 /bin/umount -l $1 $1
  39                 return 1
  40         }
  41
  42         /bin/mount -o noatime,move $2/sys /sys
  43         /bin/mount -o noatime,move $2/dev /dev
  44         /bin/mount -o noatime,move $2/tmp /tmp
  45         /bin/mount -o noatime,move $2/overlay /overlay 2>&-
  46         return 0
  47 }
  48
  49 run_ramfs() { # <command> [...]
  50         install_bin /bin/busybox /bin/ash /bin/sh /bin/mount /bin/umount        \
  51                 /sbin/pivot_root /sbin/reboot /bin/sync /bin/dd /bin/grep       \
  52                 /bin/cp /bin/mv /bin/tar /usr/bin/md5sum "/usr/bin/[" /bin/dd   \
  53                 /bin/vi /bin/ls /bin/cat /usr/bin/awk /usr/bin/hexdump          \
  54                 /bin/sleep /bin/zcat /usr/bin/bzcat /usr/bin/printf /usr/bin/wc \
  55                 /bin/cut /usr/bin/printf /bin/sync /bin/mkdir /bin/rmdir        \
  56                 /bin/rm /usr/bin/basename /bin/kill /bin/chmod /usr/bin/find \
  57                 /bin/mknod
  58
  59         install_bin /sbin/mtd
  60         install_bin /sbin/mount_root
  61         install_bin /sbin/snapshot
  62         install_bin /sbin/snapshot_tool
  63         install_bin /usr/sbin/ubiupdatevol
  64         install_bin /usr/sbin/ubiattach
  65         install_bin /usr/sbin/ubiblock
  66         install_bin /usr/sbin/ubiformat
  67         install_bin /usr/sbin/ubidetach
  68         install_bin /usr/sbin/ubirsvol
  69         install_bin /usr/sbin/ubirmvol
  70         install_bin /usr/sbin/ubimkvol
  71         install_bin /usr/sbin/partx
  72         install_bin /usr/sbin/losetup
  73         install_bin /usr/sbin/mkfs.ext4
  74         for file in $RAMFS_COPY_BIN; do
  75                 install_bin ${file//:/ }
  76         done
  77         install_file /etc/resolv.conf /lib/*.sh /lib/functions/*.sh /lib/upgrade/*.sh $RAMFS_COPY_DATA
  78
  79         [ -L "/lib64" ] && ln -s /lib $RAM_ROOT/lib64
  80
  81         supivot $RAM_ROOT /mnt || {
  82                 echo "Failed to switch over to ramfs. Please reboot."
  83                 exit 1
  84         }
  85
  86         /bin/mount -o remount,ro /mnt
  87         /bin/umount -l /mnt
  88
  89         grep /overlay /proc/mounts > /dev/null && {
  90                 /bin/mount -o noatime,remount,ro /overlay
  91                 /bin/umount -l /overlay
  92         }
  93
  94         # spawn a new shell from ramdisk to reduce the probability of cache issues
  95         exec /bin/busybox ash -c "$*"
  96 }
  97
  98 kill_remaining() { # [ <signal> [ <loop> ] ]
  99         local sig="${1:-TERM}"
 100         local loop="${2:-0}"
 101         local run=true
 102         local stat
 103
 104         echo -n "Sending $sig to remaining processes ... "
 105
 106         while $run; do
 107                 run=false
 108                 for stat in /proc/[0-9]*/stat; do
 109                         [ -f "$stat" ] || continue
 110
 111                         local pid name state ppid rest
 112                         read pid name state ppid rest < $stat
 113                         name="${name#(}"; name="${name%)}"
 114
 115                         # Skip PID1, ourself and our children
 116                         [ $pid -ne 1 -a $pid -ne $$ -a $ppid -ne $$ ] || continue
 117
 118                         local cmdline
 119                         read cmdline < /proc/$pid/cmdline
 120
 121                         # Skip kernel threads
 122                         [ -n "$cmdline" ] || continue
 123
 124                         echo -n "$name "
 125                         kill -$sig $pid 2>/dev/null
 126
 127                         [ $loop -eq 1 ] && run=true
 128                 done
 129         done
 130         echo ""
 131 }
 132
 133 run_hooks() {
 134         local arg="$1"; shift
 135         for func in "$@"; do
 136                 eval "$func $arg"
 137         done
 138 }
 139
 140 ask_bool() {
 141         local default="$1"; shift;
 142         local answer="$default"
 143
 144         [ "$INTERACTIVE" -eq 1 ] && {
 145                 case "$default" in
 146                         0) echo -n "$* (y/N): ";;
 147                         *) echo -n "$* (Y/n): ";;
 148                 esac
 149                 read answer
 150                 case "$answer" in
 151                         y*) answer=1;;
 152                         n*) answer=0;;
 153                         *) answer="$default";;
 154                 esac
 155         }
 156         [ "$answer" -gt 0 ]
 157 }
 158
 159 v() {
 160         [ "$VERBOSE" -ge 1 ] && echo "$@"
 161 }
 162
 163 json_string() {
 164         local v="$1"
 165         v="${v//\\/\\\\}"
 166         v="${v//\"/\\\"}"
 167         echo "\"$v\""
 168 }
 169
 170 rootfs_type() {
 171         /bin/mount | awk '($3 ~ /^\/$/) && ($5 !~ /rootfs/) { print $5 }'
 172 }
 173
 174 get_image() { # <source> [ <command> ]
 175         local from="$1"
 176         local cat="$2"
 177
 178         if [ -z "$cat" ]; then
 179                 local magic="$(dd if="$from" bs=2 count=1 2>/dev/null | hexdump -n 2 -e '1/1 "%02x"')"
 180                 case "$magic" in
 181                         1f8b) cat="zcat";;
 182                         425a) cat="bzcat";;
 183                         *) cat="cat";;
 184                 esac
 185         fi
 186
 187         $cat "$from" 2>/dev/null
 188 }
 189
 190 get_magic_word() {
 191         (get_image "$@" | dd bs=2 count=1 | hexdump -v -n 2 -e '1/1 "%02x"') 2>/dev/null
 192 }
 193
 194 get_magic_long() {
 195         (get_image "$@" | dd bs=4 count=1 | hexdump -v -n 4 -e '1/1 "%02x"') 2>/dev/null
 196 }
 197
 198 export_bootdevice() {
 199         local cmdline uuid disk uevent
 200         local MAJOR MINOR DEVNAME DEVTYPE
 201
 202         if read cmdline < /proc/cmdline; then
 203                 case "$cmdline" in
 204                         *block2mtd=*)
 205                                 disk="${cmdline##*block2mtd=}"
 206                                 disk="${disk%%,*}"
 207                         ;;
 208                         *root=*)
 209                                 disk="${cmdline##*root=}"
 210                                 disk="${disk%% *}"
 211                         ;;
 212                 esac
 213
 214                 case "$disk" in
 215                         PARTUUID=[a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9]-02)
 216                                 uuid="${disk#PARTUUID=}"
 217                                 uuid="${uuid%-02}"
 218                                 for disk in $(find /dev -type b); do
 219                                         set -- $(dd if=$disk bs=1 skip=440 count=4 2>/dev/null | hexdump -v -e '4/1 "%02x "')
 220                                         if [ "$4$3$2$1" = "$uuid" ]; then
 221                                                 uevent="/sys/class/block/${disk##*/}/uevent"
 222                                                 break
 223                                         fi
 224                                 done
 225                         ;;
 226                         /dev/*)
 227                                 uevent="/sys/class/block/${disk##*/}/uevent"
 228                         ;;
 229                 esac
 230
 231                 if [ -e "$uevent" ]; then
 232                         . "$uevent"
 233
 234                         export BOOTDEV_MAJOR=$MAJOR
 235                         export BOOTDEV_MINOR=$MINOR
 236                         return 0
 237                 fi
 238         fi
 239
 240         return 1
 241 }
 242
 243 export_partdevice() {
 244         local var="$1" offset="$2"
 245         local uevent MAJOR MINOR DEVNAME DEVTYPE
 246
 247         for uevent in /sys/class/block/*/uevent; do
 248                 . "$uevent"
 249                 if [ $BOOTDEV_MAJOR = $MAJOR -a $(($BOOTDEV_MINOR + $offset)) = $MINOR -a -b "/dev/$DEVNAME" ]; then
 250                         export "$var=$DEVNAME"
 251                         return 0
 252                 fi
 253         done
 254
 255         return 1
 256 }
 257
 258 get_partitions() { # <device> <filename>
 259         local disk="$1"
 260         local filename="$2"
 261
 262         if [ -b "$disk" -o -f "$disk" ]; then
 263                 v "Reading partition table from $filename..."
 264
 265                 local magic="$(hexdump -v -n 2 -s 0x1FE -e '1/2 "0x%04X"' "$disk")"
 266                 if [ "$magic" != 0xAA55 ]; then
 267                         v "Invalid partition table on $disk"
 268                         exit
 269                 fi
 270
 271                 rm -f "/tmp/partmap.$filename"
 272
 273                 local part
 274                 for part in 1 2 3 4; do
 275                         set -- $(hexdump -v -n 12 -s "$((0x1B2 + $part * 16))" -e '3/4 "0x%08X "' "$disk")
 276
 277                         local type="$(($1 % 256))"
 278                         local lba="$(($2))"
 279                         local num="$(($3))"
 280
 281                         [ $type -gt 0 ] || continue
 282
 283                         printf "%2d %5d %7d\n" $part $lba $num >> "/tmp/partmap.$filename"
 284                 done
 285         fi
 286 }
 287
 288 jffs2_copy_config() {
 289         if grep rootfs_data /proc/mtd >/dev/null; then
 290                 # squashfs+jffs2
 291                 mtd -e rootfs_data jffs2write "$CONF_TAR" rootfs_data
 292         else
 293                 # jffs2
 294                 mtd jffs2write "$CONF_TAR" rootfs
 295         fi
 296 }
 297
 298 # Flash firmware to MTD partition
 299 #
 300 # $(1): path to image
 301 # $(2): (optional) pipe command to extract firmware, e.g. dd bs=n skip=m
 302 default_do_upgrade() {
 303         sync
 304         if [ "$SAVE_CONFIG" -eq 1 ]; then
 305                 get_image "$1" "$2" | mtd $MTD_CONFIG_ARGS -j "$CONF_TAR" write - "${PART_NAME:-image}"
 306         else
 307                 get_image "$1" "$2" | mtd write - "${PART_NAME:-image}"
 308         fi
 309 }
 310
 311 do_upgrade_stage2() {
 312         v "Performing system upgrade..."
 313         if [ -n "$do_upgrade" ]; then
 314                 $do_upgrade "$IMAGE"
 315         elif type 'platform_do_upgrade' >/dev/null 2>/dev/null; then
 316                 platform_do_upgrade "$IMAGE"
 317         else
 318                 default_do_upgrade "$IMAGE"
 319         fi
 320
 321         if [ "$SAVE_CONFIG" -eq 1 ] && type 'platform_copy_config' >/dev/null 2>/dev/null; then
 322                 platform_copy_config
 323         fi
 324
 325         v "Upgrade completed"
 326         sleep 1
 327
 328         v "Rebooting system..."
 329         umount -a
 330         reboot -f
 331         sleep 5
 332         echo b 2>/dev/null >/proc/sysrq-trigger
 333 }