mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-23 15:32:33 +00:00
59130180ec
This will explain what is actually occuring on dd invocations. Additionally remove comments for steps which are described by printed statements anyway. Signed-off-by: Tomasz Maciej Nowak <tmn505@gmail.com>
92 lines
2.2 KiB
Bash
92 lines
2.2 KiB
Bash
REQUIRE_IMAGE_METADATA=1
|
|
|
|
platform_check_image() {
|
|
local diskdev partdev diff
|
|
|
|
[ "$#" -gt 1 ] && return 1
|
|
|
|
export_bootdevice && export_partdevice diskdev 0 || {
|
|
v "Unable to determine upgrade device"
|
|
return 1
|
|
}
|
|
|
|
get_partitions "/dev/$diskdev" bootdisk
|
|
|
|
v "Extract boot sector from the image"
|
|
get_image_dd "$1" of=/tmp/image.bs count=1 bs=512b
|
|
|
|
get_partitions /tmp/image.bs image
|
|
|
|
#compare tables
|
|
diff="$(grep -F -x -v -f /tmp/partmap.bootdisk /tmp/partmap.image)"
|
|
|
|
rm -f /tmp/image.bs /tmp/partmap.bootdisk /tmp/partmap.image
|
|
|
|
if [ -n "$diff" ]; then
|
|
v "Partition layout has changed. Full image will be written."
|
|
ask_bool 0 "Abort" && exit 1
|
|
return 0
|
|
fi
|
|
}
|
|
|
|
platform_copy_config() {
|
|
local partdev
|
|
|
|
if export_partdevice partdev 1; then
|
|
mount -o rw,noatime "/dev/$partdev" /mnt
|
|
cp -af "$UPGRADE_BACKUP" "/mnt/$BACKUP_FILE"
|
|
umount /mnt
|
|
fi
|
|
}
|
|
|
|
platform_do_upgrade() {
|
|
local diskdev partdev diff
|
|
|
|
export_bootdevice && export_partdevice diskdev 0 || {
|
|
v "Unable to determine upgrade device"
|
|
return 1
|
|
}
|
|
|
|
sync
|
|
|
|
if [ "$UPGRADE_OPT_SAVE_PARTITIONS" = "1" ]; then
|
|
get_partitions "/dev/$diskdev" bootdisk
|
|
|
|
v "Extract boot sector from the image"
|
|
get_image_dd "$1" of=/tmp/image.bs count=1 bs=512b
|
|
|
|
get_partitions /tmp/image.bs image
|
|
|
|
#compare tables
|
|
diff="$(grep -F -x -v -f /tmp/partmap.bootdisk /tmp/partmap.image)"
|
|
else
|
|
diff=1
|
|
fi
|
|
|
|
if [ -n "$diff" ]; then
|
|
get_image_dd "$1" of="/dev/$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
|
|
|
|
v "Writing bootloader to /dev/$diskdev"
|
|
get_image_dd "$1" of="$diskdev" bs=512 skip=1 seek=1 count=4097 conv=fsync,notrunc
|
|
#iterate over each partition from the image and write it to the boot disk
|
|
while read part start size; do
|
|
if export_partdevice partdev $part; then
|
|
v "Writing image to /dev/$partdev..."
|
|
get_image_dd "$1" of="/dev/$partdev" ibs="512" obs=1M skip="$start" count="$size" conv=fsync
|
|
else
|
|
v "Unable to find partition $part device, skipped."
|
|
fi
|
|
done < /tmp/partmap.image
|
|
|
|
v "Writing new UUID to /dev/$diskdev..."
|
|
get_image_dd "$1" of="/dev/$diskdev" bs=1 skip=440 count=4 seek=440 conv=fsync
|
|
}
|