- local diskdev partdev ibs diff
-
- if export_bootdevice && export_partdevice diskdev -2; 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
-
- #write uboot image
- get_image "$@" | dd of="$diskdev" bs=1024 skip=8 seek=8 count=1016 conv=fsync
- #iterate over each partition from the image and write it to the boot disk
- while read part start size; do
- part="$(($part - 2))"
- if 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
+ local diskdev partdev diff
+
+ export_bootdevice && export_partdevice diskdev -2 || {
+ echo "Unable to determine upgrade device"
+ return 1
+ }
+
+ sync
+
+ if [ "$SAVE_PARTITIONS" = "1" ]; then
+ get_partitions "/dev/$diskdev" bootdisk
+
+ #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)"
+ 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/$diskdev"
+
+ return 0
+ fi
+
+ #write uboot image
+ get_image "$@" | dd of="$diskdev" bs=1024 skip=8 seek=8 count=1016 conv=fsync
+ #iterate over each partition from the image and write it to the boot disk
+ while read part start size; do
+ part="$(($part - 2))"
+ 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