-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 "$cmdline" in
- *block2mtd=*)
- disk="${cmdline##*block2mtd=}"
- disk="${disk%%,*}"
- ;;
- *root=*)
- disk="${cmdline##*root=}"
- disk="${disk%% *}"
- ;;
- esac
-
- case "$disk" 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 $(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
- uevent="/sys/class/block/${disk##*/}/uevent"
- break
- fi
- done
- ;;
- /dev/*)
- uevent="/sys/class/block/${disk##*/}/uevent"
- ;;
- esac
-
- if [ -e "$uevent" ]; then
- . "$uevent"
-
- export BOOTDEV_MAJOR=$MAJOR
- export BOOTDEV_MINOR=$MINOR
-
- return 0
- fi
- fi
-
- return 1
-}
-
platform_check_image() {
+ local diskdev partdev diff
[ "$#" -gt 1 ] && return 1
case "$(get_magic_word "$1")" in
- eb48|eb63) return 0;;
+ eb48|eb63) ;;
*)
echo "Invalid image type"
return 1
;;
esac
+
+ export_bootdevice && export_partdevice diskdev 0 || {
+ echo "Unable to determine upgrade device"
+ return 1
+ }
+
+ get_partitions "/dev/$diskdev" bootdisk
+
+ #extract the boot sector from the image
+ get_image "$@" | dd of=/tmp/image.bs count=1 bs=512b 2>/dev/null
+
+ get_partitions /tmp/image.bs image
+
+ #compare tables
+ diff="$(grep -F -x -v -f /tmp/partmap.bootdisk /tmp/partmap.image)"
+
+ rm -f /tmp/image.bs /tmp/partmap.bootdisk /tmp/partmap.image
+
+ if [ -n "$diff" ]; then
+ echo "Partition layout has changed. Full image will be written."
+ ask_bool 0 "Abort" && exit 1
+ return 0
+ fi
}
platform_copy_config() {
local partdev
- if platform_export_partdevice partdev 1; then
+ if export_partdevice partdev 1; then
mount -t ext4 -o rw,noatime "/dev/$partdev" /mnt
cp -af "$CONF_TAR" /mnt/
umount /mnt
fi
}
-get_partitions() { # <device> <filename>
- local disk="$1"
- local filename="$2"
+platform_do_upgrade() {
+ local diskdev partdev diff
- if [ -b "$disk" -o -f "$disk" ]; then
- echo "Reading partition table from $filename..."
+ export_bootdevice && export_partdevice diskdev 0 || {
+ echo "Unable to determine upgrade device"
+ return 1
+ }
- local magic="$(hexdump -v -n 2 -s 0x1FE -e '1/2 "0x%04X"' "$disk")"
- if [ "$magic" != 0xAA55 ]; then
- echo "Invalid partition table on $disk"
- exit
- fi
+ sync
- rm -f "/tmp/partmap.$filename"
+ if [ "$UPGRADE_OPT_SAVE_PARTITIONS" = "1" ]; then
+ get_partitions "/dev/$diskdev" bootdisk
- 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")
+ #extract the boot sector from the image
+ get_image "$@" | dd of=/tmp/image.bs count=1 bs=512b
- local type="$(($1 % 256))"
- local lba="$(($2))"
- local num="$(($3))"
+ get_partitions /tmp/image.bs image
- [ $type -gt 0 ] || continue
+ #compare tables
+ diff="$(grep -F -x -v -f /tmp/partmap.bootdisk /tmp/partmap.image)"
+ else
+ diff=1
+ fi
+
+ if [ -n "$diff" ]; then
+ get_image "$@" | dd of="/dev/$diskdev" bs=4096 conv=fsync
+
+ # Separate removal and addtion is necessary; otherwise, partition 1
+ # will be missing if it overlaps with the old partition 2
+ partx -d - "/dev/$diskdev"
+ partx -a - "/dev/$diskdev"
- printf "%2d %5d %7d\n" $part $lba $num >> "/tmp/partmap.$filename"
- done
+ return 0
fi
-}
-platform_do_upgrade() {
- local diskdev partdev ibs diff
-
- if platform_export_bootdevice && platform_export_partdevice diskdev 0; then
- sync
- 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
+ #iterate over each partition from the image and write it to the boot disk
+ while read part start size; do
+ if export_partdevice partdev $part; then
+ echo "Writing image to /dev/$partdev..."
+ get_image "$@" | dd of="/dev/$partdev" ibs="512" obs=1M skip="$start" count="$size" conv=fsync
else
- get_image "$@" | dd of="/dev/$diskdev" bs=4096 conv=fsync
+ echo "Unable to find partition $part device, skipped."
fi
+ done < /tmp/partmap.image
- sleep 1
- fi
+ #copy partition uuid
+ echo "Writing new UUID to /dev/$diskdev..."
+ get_image "$@" | dd of="/dev/$diskdev" bs=1 skip=440 count=4 seek=440 conv=fsync
}