export-image: when work in a non-English locale environment the PARTUUID will silently fail, resulting to an unbootable image file. (#96)

* use dd and xxd to get disk identifier

* add xxd as dependency

export-image/03-set-partuuid/00-run.sh

@@ -2,7 +2,7 @@
 
 IMG_FILE="${STAGE_WORK_DIR}/${IMG_DATE}-${IMG_NAME}${IMG_SUFFIX}.img"
 
-IMGID="$(fdisk -l ${IMG_FILE} | sed -n 's/Disk identifier: 0x\([^ ]*\)/\1/p')"
+IMGID="$(dd if=${IMG_FILE} skip=440 bs=1 count=4 2>/dev/null | xxd -e | cut -f 2 -d' ')"
 
 BOOT_PARTUUID="${IMGID}-01"
 ROOT_PARTUUID="${IMGID}-02"