cb02a376b3
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>
99 lines
2.4 KiB
Bash
99 lines
2.4 KiB
Bash
. /lib/functions.sh
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# copied from x86's platform.sh
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mbl_do_platform_check() {
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local diskdev partdev diff
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[ "$#" -gt 1 ] && return 1
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export_bootdevice && export_partdevice diskdev -2 || {
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echo "Unable to determine upgrade device"
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return 1
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}
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get_partitions "/dev/$diskdev" bootdisk
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#extract the boot sector from the image
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get_image "$@" | dd of=/tmp/image.bs count=1 bs=512b 2>/dev/null
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get_partitions /tmp/image.bs image
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#compare tables
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diff="$(grep -F -x -v -f /tmp/partmap.bootdisk /tmp/partmap.image)"
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rm -f /tmp/image.bs /tmp/partmap.bootdisk /tmp/partmap.image
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if [ -n "$diff" ]; then
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echo "Partition layout has changed. Full image will be written."
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ask_bool 0 "Abort" && exit 1
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return 0
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fi
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return 0;
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}
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mbl_do_upgrade() {
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local diskdev partdev diff
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export_bootdevice && export_partdevice diskdev -2 || {
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echo "Unable to determine upgrade device"
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return 1
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}
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sync
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if [ "$SAVE_PARTITIONS" = "1" ]; then
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get_partitions "/dev/$diskdev" bootdisk
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#extract the boot sector from the image
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get_image "$@" | dd of=/tmp/image.bs count=1 bs=512b
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get_partitions /tmp/image.bs image
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#compare tables
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diff="$(grep -F -x -v -f /tmp/partmap.bootdisk /tmp/partmap.image)"
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else
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diff=1
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fi
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if [ -n "$diff" ]; then
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get_image "$@" | dd of="/dev/$diskdev" bs=4096 conv=fsync
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# Separate removal and addtion is necessary; otherwise, partition 1
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# will be missing if it overlaps with the old partition 2
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partx -d - "/dev/$diskdev"
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partx -a - "/dev/$diskdev"
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return 0
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fi
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#iterate over each partition from the image and write it to the boot disk
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while read part start size; do
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# root is /dev/sd[a|b]2 and not /dev/sd[a|b] this causes some problem
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# one of which is this offset, I'm not sure what's the best fix, so
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# here's a WA.
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let part=$((part - 2))
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if export_partdevice partdev $part; then
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echo "Writing image to /dev/$partdev..."
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get_image "$@" | dd of="/dev/$partdev" ibs="512" obs=1M skip="$start" count="$size" conv=fsync
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else
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echo "Unable to find partition $part device, skipped."
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fi
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done < /tmp/partmap.image
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#copy partition uuid
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echo "Writing new UUID to /dev/$diskdev..."
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get_image "$@" | dd of="/dev/$diskdev" bs=1 skip=440 count=4 seek=440 conv=fsync
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}
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mbl_copy_config() {
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local partdev
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# Same as above /dev/sd[a|b]2 is root, so /boot is -1
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if export_partdevice partdev -1; then
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mount -t ext4 -o rw,noatime "/dev/$partdev" /mnt
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cp -af "$CONF_TAR" /mnt/
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umount /mnt
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fi
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}
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