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a77633d36d
By returning early when no upgrade device can be found and handling the SAVE_PARTITIONS=0 case differently, we can get rid of two levels of if. Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>
90 lines
2.1 KiB
Bash
90 lines
2.1 KiB
Bash
platform_check_image() {
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local diskdev partdev diff
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[ "$#" -gt 1 ] && return 1
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case "$(get_magic_word "$1")" in
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eb48|eb63) ;;
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*)
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echo "Invalid image type"
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return 1
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;;
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esac
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export_bootdevice && export_partdevice diskdev 0 || {
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echo "Unable to determine upgrade device"
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return 1
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}
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get_partitions "/dev/$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 "$diff" ]; then
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echo "Partition layout has changed. Full image will be written."
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ask_bool 0 "Abort" && exit 1
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return 0
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fi
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}
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platform_copy_config() {
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local partdev
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if export_partdevice partdev 1; then
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mount -t ext4 -o rw,noatime "/dev/$partdev" /mnt
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cp -af "$CONF_TAR" /mnt/
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umount /mnt
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fi
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}
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platform_do_upgrade() {
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local diskdev partdev diff
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export_bootdevice && export_partdevice diskdev 0 || {
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echo "Unable to determine upgrade device"
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return 1
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}
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sync
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if [ "$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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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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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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