+identify_target_uuid() {
+ local device="$1"
+
+ if ! [ -b "$device" ] ; then
+ return 1
+ fi
+
+ eval "$(blkid -o udev "$1" 2>/dev/null)"
+
+ if [ -n "$ID_FS_UUID" ] ; then
+ echo "$ID_FS_UUID"
+ else
+ return 1
+ fi
+}
+
+mountpoint_to_blockdevice() {
+ TARGET_UUID=''
+
+ TARGET_UUID=$(identify_target_uuid "$TARGET" 2>/dev/null || true)
+ if [ -n "$TARGET_UUID" ] ; then
+ einfo "Identified UUID $TARGET_UUID for $TARGET"
+ return 0
+ fi
+
+ # $TARGET might be a mountpoint and not a blockdevice, search for according entry
+ for file in /sys/block/*/*/dev ; do
+ if grep -q "^$(mountpoint -d "${TARGET}")$" "$file" ; then
+ local dev
+ dev="${file%/dev}"
+ dev="/dev/${dev##*/}"
+ TARGET_UUID=$(identify_target_uuid "$dev" 2>/dev/null || true)
+
+ if [ -n "$TARGET_UUID" ] ; then
+ einfo "Identified UUID $TARGET_UUID for $TARGET (via $file)"
+ return 0
+ fi
+ fi
+ done
+}
+