MEN-5221: Keep the UUID of the original first partition

This simply writes the GPT UUID of the boot partition to be the same as the UUID
of the first partition in the original disk image.

Changelog: Keep the UUID of the original first partition on the boot partition
of the converted image when the partition table is GPT.

Signed-off-by: Ole Petter <ole.orhagen@northern.tech>

mender-convert-package

@@ -256,6 +256,10 @@ if [ "${partition_scheme}" == "gpt" ]; then
     log_info "Writing GPT partition table"
     run_and_log_cmd "${PARTED} -s ${img_path} mklabel gpt"
     run_and_log_cmd "${PARTED} -s ${img_path} unit s mkpart ESP fat32 ${boot_part_start} ${boot_part_end}"
+    # Keep the uuid of the original gpt table for the boot partition
+    boot_partuuid=$(disk_get_part_value "${disk_image}" 1 UUID)
+    log_info "Updating GPT partition uuid of the boot partition in image: ${img_path} to ${boot_partuuid}"
+    run_and_log_cmd "sgdisk -u ${MENDER_BOOT_PART_NUMBER}:${boot_partuuid} '${img_path}'"
 else
     log_info "Writing DOS (MBR) partition table"
     run_and_log_cmd "${PARTED} -s ${img_path} mklabel msdos"