+get_gpt_name ()
+{
+ local dev="${1}"
+ /sbin/blkid -s PART_ENTRY_NAME -p -o value ${dev} 2>/dev/null
+}
+
+is_gpt_device ()
+{
+ local dev="${1}"
+ [ "$(/sbin/blkid -s PART_ENTRY_SCHEME -p -o value ${dev} 2>/dev/null)" = "gpt" ]
+}
+
+probe_for_gpt_name ()
+{
+ local overlays="${1}"
+ local snapshots="${2}"
+ local dev="${3}"
+
+ local gpt_dev="${dev}"
+ if is_active_luks_mapping ${dev}
+ then
+ # if $dev is an opened luks device, we need to check
+ # GPT stuff on the backing device
+ gpt_dev=$(get_luks_backing_device "${dev}")
+ fi
+
+ if ! is_gpt_device ${gpt_dev}
+ then
+ return
+ fi
+
+ local gpt_name=$(get_gpt_name ${gpt_dev})
+ for label in ${overlays} ${snapshots}
+ do
+ if [ "${gpt_name}" = "${label}" ]
+ then
+ echo "${label}=${dev}"
+ fi
+ done
+}
+
+probe_for_fs_label ()
+{
+ local overlays="${1}"
+ local snapshots="${2}"
+ local dev="${3}"
+
+ for label in ${overlays} ${snapshots}
+ do
+ if [ "$(/sbin/blkid -s LABEL -o value $dev 2>/dev/null)" = "${label}" ]
+ then
+ echo "${label}=${dev}"
+ fi
+ done
+}
+
+probe_for_file_name ()
+{
+ local overlays="${1}"
+ local snapshots="${2}"
+ local dev="${3}"
+
+ local ret=""
+ local backing="$(mount_persistence_media ${dev})"
+ if [ -z "${backing}" ]
+ then
+ return
+ fi
+
+ for label in ${overlays}
+ do
+ path=${backing}/${PERSISTENCE_PATH}${label}
+ if [ -f "${path}" ]
+ then
+ local loopdev=$(setup_loop "${path}" "loop" "/sys/block/loop*")
+ ret="${ret} ${label}=${loopdev}"
+ fi
+ done
+ for label in ${snapshots}
+ do
+ for ext in squashfs cpio.gz ext2 ext3 ext4 jffs2
+ do
+ path="${PERSISTENCE_PATH}${label}.${ext}"
+ if [ -f "${backing}/${path}" ]
+ then
+ ret="${ret} ${label}=${dev}:${backing}:${path}"
+ fi
+ done
+ done
+
+ if [ -n "${ret}" ]
+ then
+ echo ${ret}
+ else
+ umount ${backing} > /dev/null 2>&1 || true
+ fi
+}
+
+find_persistence_media ()