-platform_export_bootpart() {
- local cmdline uuid disk
+platform_export_partdevice() {
+ local var="$1" offset="$2"
+ local uevent MAJOR MINOR DEVNAME DEVTYPE
+
+ for uevent in /sys/class/block/*/uevent; do
+ . "$uevent"
+ if [ $BOOTDEV_MAJOR = $MAJOR -a $(($BOOTDEV_MINOR + $offset)) = $MINOR -a -b "/dev/$DEVNAME" ]; then
+ export "$var=$DEVNAME"
+ return 0
+ fi
+ done
+
+ return 1
+}
+
+platform_export_bootdevice() {
+ local cmdline uuid disk uevent
+ local MAJOR MINOR DEVNAME DEVTYPE
if read cmdline < /proc/cmdline; then
case "$cmdline" in
PARTUUID=[a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9]-02)
uuid="${disk#PARTUUID=}"
uuid="${uuid%-02}"
- for disk in /dev/[hsv]d[a-z]; do
+ for disk in $(find /dev -type b); do
set -- $(dd if=$disk bs=1 skip=440 count=4 2>/dev/null | hexdump -v -e '4/1 "%02x "')
if [ "$4$3$2$1" = "$uuid" ]; then
- export BOOTPART="${disk}1"
- return 0
+ uevent="/sys/class/block/${disk##*/}/uevent"
+ break
fi
done
;;
/dev/*)
- export BOOTPART="${disk%[0-9]}1"
- return 0
+ uevent="/sys/class/block/${disk##*/}/uevent"
;;
esac
+
+ if [ -e "$uevent" ]; then
+ . "$uevent"
+
+ export BOOTDEV_MAJOR=$MAJOR
+ export BOOTDEV_MINOR=$MINOR
+
+ return 0
+ fi
fi
return 1
}
platform_copy_config() {
- if [ -b "$BOOTPART" ]; then
- mount -t ext4 -o rw,noatime "$BOOTPART" /mnt
+ local partdev
+
+ if platform_export_partdevice partdev 1; then
+ mount -t ext4 -o rw,noatime "/dev/$partdev" /mnt
cp -af "$CONF_TAR" /mnt/
umount /mnt
fi
}
+get_partitions() { # <device> <filename>
+ local disk="$1"
+ local filename="$2"
+
+ if [ -b "$disk" -o -f "$disk" ]; then
+ echo "Reading partition table from $filename..."
+
+ local magic="$(hexdump -v -n 2 -s 0x1FE -e '1/2 "0x%04X"' "$disk")"
+ if [ "$magic" != 0xAA55 ]; then
+ echo "Invalid partition table on $disk"
+ exit
+ fi
+
+ rm -f "/tmp/partmap.$filename"
+
+ local part
+ for part in 1 2 3 4; do
+ set -- $(hexdump -v -n 12 -s "$((0x1B2 + $part * 16))" -e '3/4 "0x%08X "' "$disk")
+
+ local type="$(($1 % 256))"
+ local lba="$(($2))"
+ local num="$(($3))"
+
+ [ $type -gt 0 ] || continue
+
+ printf "%2d %5d %7d\n" $part $lba $num >> "/tmp/partmap.$filename"
+ done
+ fi
+}
+
platform_do_upgrade() {
- platform_export_bootpart
+ local diskdev partdev ibs diff
- if [ -b "${BOOTPART%[0-9]}" ]; then
+ if platform_export_bootdevice && platform_export_partdevice diskdev 0; then
sync
- get_image "$@" | dd of="${BOOTPART%[0-9]}" bs=4096 conv=fsync
+ if [ "$SAVE_PARTITIONS" = "1" ]; then
+ get_partitions "/dev/$diskdev" bootdisk
+
+ #get block size
+ if [ -f "/sys/block/$diskdev/queue/physical_block_size" ]; then
+ ibs="$(cat "/sys/block/$diskdev/queue/physical_block_size")"
+ else
+ ibs=512
+ fi
+
+ #extract the boot sector from the image
+ get_image "$@" | dd of=/tmp/image.bs count=1 bs=512b
+
+ get_partitions /tmp/image.bs image
+
+ #compare tables
+ diff="$(grep -F -x -v -f /tmp/partmap.bootdisk /tmp/partmap.image)"
+ if [ -n "$diff" ]; then
+ echo "Partition layout is changed. Full image will be written."
+ ask_bool 0 "Abort" && exit
+
+ get_image "$@" | dd of="/dev/$diskdev" bs=4096 conv=fsync
+ return 0
+ fi
+
+ #iterate over each partition from the image and write it to the boot disk
+ while read part start size; do
+ if platform_export_partdevice partdev $part; then
+ echo "Writing image to /dev/$partdev..."
+ get_image "$@" | dd of="/dev/$partdev" ibs="$ibs" obs=1M skip="$start" count="$size" conv=fsync
+ else
+ echo "Unable to find partition $part device, skipped."
+ fi
+ done < /tmp/partmap.image
+
+ #copy partition uuid
+ echo "Writing new UUID to /dev/$diskdev..."
+ get_image "$@" | dd of="/dev/$diskdev" bs=1 skip=440 count=4 seek=440 conv=fsync
+ else
+ get_image "$@" | dd of="/dev/$diskdev" bs=4096 conv=fsync
+ fi
+
sleep 1
fi
}