apm821xx: use x86's upgrade scripts for MyBook Live

Advantages:
 - preserves existing partition layout. On the hard-drive.
   Only the boot and rootfs partition will be overwritten.

Disadvantages:
 - The upgrade process takes much longer to run.
   from 2-3 seconds to 15-25 seconds.

Please note that sysupgrade will refuse to upgrade, if the existing
installation has an incompatible partition layout. Future changes
to the bootfs and/or rootfs partition size will likely cause breakage
to the sysupgrade procedure. In these cases, the ext4-rootfs.img.gz
has to be written manually onto the disk. Please don't forget to backup
your configuration in this cases.

Note2: This patch requires
"base-files: upgrade: make get_partitions() endian agnostic"

Note3: If your current installation does not host the two
changes, sysupgrading will wipe the existing partition
layout. Don't forget to backup your data!

Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
master
Christian Lamparter 7 years ago committed by John Crispin
parent 06f8b4ddbd
commit cb02a376b3
  1. 2
      target/linux/apm821xx/base-files/lib/upgrade/platform.sh
  2. 99
      target/linux/apm821xx/base-files/lib/upgrade/wdbook.sh

@ -9,7 +9,7 @@ platform_check_image() {
case "$board" in
mbl)
mbl_do_platform_check $board "$1"
mbl_do_platform_check "$1"
return $?;
;;

@ -1,36 +1,99 @@
. /lib/functions.sh
get_magic_at() {
local file="$1"
local pos="$2"
get_image "$file" | dd bs=1 count=2 skip="$pos" 2>/dev/null | hexdump -v -n 2 -e '1/1 "%02x"'
}
# copied from x86's platform.sh
mbl_do_platform_check() {
local board="$1"
local file="$2"
local magic
local diskdev partdev diff
magic=$(get_magic_at "$file" 510)
[ "$#" -gt 1 ] && return 1
[ "$magic" != "55aa" ] && {
echo "Failed to verify MBR boot signature."
export_bootdevice && export_partdevice diskdev -2 || {
echo "Unable to determine upgrade device"
return 1
}
get_partitions "/dev/$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
return 0;
}
mbl_do_upgrade() {
local diskdev partdev diff
export_bootdevice && export_partdevice diskdev -2 || {
echo "Unable to determine upgrade device"
return 1
}
sync
get_image "$1" | dd of=/dev/sda bs=2M conv=fsync
sleep 1
if [ "$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
#iterate over each partition from the image and write it to the boot disk
while read part start size; do
# root is /dev/sd[a|b]2 and not /dev/sd[a|b] this causes some problem
# one of which is this offset, I'm not sure what's the best fix, so
# here's a WA.
let 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
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
}
mbl_copy_config() {
mkdir -p /boot
[ -f /boot/uImage ] || mount -t ext4 -o rw,noatime /dev/sda1 /boot
cp -af "$CONF_TAR" /boot/
sync
umount /boot
local partdev
# Same as above /dev/sd[a|b]2 is root, so /boot is -1
if export_partdevice partdev -1; then
mount -t ext4 -o rw,noatime "/dev/$partdev" /mnt
cp -af "$CONF_TAR" /mnt/
umount /mnt
fi
}

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