1 platform_check_image() {
2 local diskdev partdev diff
4 export_bootdevice && export_partdevice diskdev 0 || {
5 echo "Unable to determine upgrade device"
9 get_partitions "/dev/$diskdev" bootdisk
11 #extract the boot sector from the image
12 get_image "$@" | dd of=/tmp/image.bs count=1 bs=512b 2>/dev/null
14 get_partitions /tmp/image.bs image
17 diff="$(grep -F -x -v -f /tmp/partmap.bootdisk /tmp/partmap.image)"
19 rm -f /tmp/image.bs /tmp/partmap.bootdisk /tmp/partmap.image
21 if [ -n "$diff" ]; then
22 echo "Partition layout has changed. Full image will be written."
23 ask_bool 0 "Abort" && exit 1
28 platform_copy_config() {
31 if export_partdevice partdev 1; then
32 mount -t vfat -o rw,noatime "/dev/$partdev" /mnt
33 cp -af "$CONF_TAR" /mnt/
38 platform_do_upgrade() {
39 local diskdev partdev diff
41 export_bootdevice && export_partdevice diskdev 0 || {
42 echo "Unable to determine upgrade device"
48 if [ "$UPGRADE_OPT_SAVE_PARTITIONS" = "1" ]; then
49 get_partitions "/dev/$diskdev" bootdisk
51 #extract the boot sector from the image
52 get_image "$@" | dd of=/tmp/image.bs count=1 bs=512b
54 get_partitions /tmp/image.bs image
57 diff="$(grep -F -x -v -f /tmp/partmap.bootdisk /tmp/partmap.image)"
62 if [ -n "$diff" ]; then
63 get_image "$@" | dd of="/dev/$diskdev" bs=4096 conv=fsync
65 # Separate removal and addtion is necessary; otherwise, partition 1
66 # will be missing if it overlaps with the old partition 2
67 partx -d - "/dev/$diskdev"
68 partx -a - "/dev/$diskdev"
74 get_image "$@" | dd of="$diskdev" bs=1024 skip=8 seek=8 count=1016 conv=fsync
75 #iterate over each partition from the image and write it to the boot disk
76 while read part start size; do
77 if export_partdevice partdev $part; then
78 echo "Writing image to /dev/$partdev..."
79 get_image "$@" | dd of="/dev/$partdev" ibs="512" obs=1M skip="$start" count="$size" conv=fsync
81 echo "Unable to find partition $part device, skipped."
83 done < /tmp/partmap.image
86 echo "Writing new UUID to /dev/$diskdev..."
87 get_image "$@" | dd of="/dev/$diskdev" bs=1 skip=440 count=4 seek=440 conv=fsync