Attempting to add some missing scripts from 1.7.22 timeframe concerning

/dev/disk/by-id migration (modified for newer distros)
Note: need some serious testing
Note: read all about it in issue #22

usr/share/rear/finalize/GNU/Linux/16_remove_diskbyid.sh

@@ -0,0 +1,92 @@
+# remove existing disk-by-id mappings 
+#
+# We call sed once for each substituation
+# it would be better to build one sed script and use this later 
+# (like verify/GNU/Linux/21_migrate_recovery_configuration.sh 
+#   and finalize/GNU/Linux/15_migrate_disk_devices.sh)
+#
+# OLD_ID_FILE contains entries like these (last 2 lines are multipath targets)
+# cciss-3600508b100104c3953573830524b0004 /dev/cciss/c0d0
+# cciss-3600508b100104c3953573830524b0004-part1 /dev/cciss/c0d0p1
+# cciss-3600508b100104c3953573830524b0004-part2 /dev/cciss/c0d0p2
+# cciss-3600508b100104c3953573830524b0004-part3 /dev/cciss/c0d0p3
+# cciss-3600508b100104c3953573830524b0004-part5 /dev/cciss/c0d0p5
+# scsi-1HITACHI_770122800061 /dev/dm-1
+# scsi-1HITACHI_770122800062 /dev/dm-0
+#
+# Those devices have already been adjusted in 
+# verify/GNU/Linux/21_migrate_recovery_configuration.sh
+
+FILES="/etc/fstab /boot/grub/menu.lst"
+
+OLD_ID_FILE=${VAR_DIR}/recovery/diskbyid_mappings
+NEW_ID_FILE=/tmp/diskbyid_mappings
+
+[ ! -s "$OLD_ID_FILE" ] && return 0
+[ -z "$FILES" ] && return 0
+
+# udevinfo is deprecated by udevadm (SLES 10 still uses udevinfo)
+UdevSymlinkName=""
+type -p udevinfo >/dev/null && UdevSymlinkName="udevinfo -r / -q symlink -n"
+type -p udevadm >/dev/null &&  UdevSymlinkName="udevadm info --query=symlink --name"
+[[ -z "$UdevSymlinkName" ]] && {
+	LogPrint "Could not find udevinfo nor udevadm (skip 16_remove_diskbyid.sh)"
+	return
+	}
+
+# replace the device names with the real devices
+
+while read ID DEV_NAME; do
+  ID_NEW=""
+  if [[ $DEV_NAME =~ /dev/dm ]]; then
+    # probably a multipath device
+    # we cannot migrate device mapper targets
+    # we delete DEV_NAME to make sure it won't get used
+    DEV_NAME=""
+  else
+    SYMLINKS=$($UdevSymlinkName $DEV_NAME)
+    set -- $SYMLINKS
+    while [ $# -gt 0 ]; do
+      if [[ $1 =~ /dev/disk/by-id ]]; then
+        # bingo, we found what we are looking for
+        ID_NEW=${1#/dev/disk/by-id/}
+        break
+      else
+        shift
+      fi
+    done
+  fi
+  echo $ID $DEV_NAME $ID_NEW
+done < $OLD_ID_FILE > $NEW_ID_FILE
+
+for file in $FILES; do
+	realfile=/mnt/local/$file
+	# keep backup
+	cp $realfile ${realfile}.rearbak
+	# we should consider creating a sed script within a string
+	# and then call sed once (as done other times)
+	while read ID DEV_NAME ID_NEW; do
+		if [ -n "$ID_NEW" ]; then 
+			# great, we found a new device
+			ID_FULL=/dev/disk/by-id/$ID
+			ID_NEW_FULL=/dev/disk/by-id/$ID_NEW
+			sed -i "s#$ID_FULL\([^-a-zA-Z0-9]\)#$ID_NEW_FULL\1#g" \
+				$realfile
+			#                 ^^^^^^^^^^^^^^^ 
+			# This is to make sure we get the full ID (and not
+			# a substring) because we ask sed for a char other then
+			# those contained in IDs. Unfortunately this won't work
+			# with IDs at line end (luckily we don't have then 
+			# right now
+		else
+			# lets try with the DEV_NAME as fallback
+			[ -z "$DEV_NAME" ] && continue 
+			# not even DEV_NAME exists, we can't do anything
+			ID_FULL=/dev/disk/by-id/$ID
+			sed -i "s#$ID_FULL\([^-a-zA-Z0-9]\)#$DEV_NAME\1#g" \
+				$realfile
+		fi
+	done < $NEW_ID_FILE
+done
+
+unset ID DEV_NAME ID_NEW SYMLINKS ID_FULL ID_NEW_FULL

usr/share/rear/layout/save/GNU/Linux/30_save_diskbyid_mappings.sh

@@ -0,0 +1,20 @@
+# Remember the mappings if any for disk-by-id
+
+# be careful udevinfo is old, now we have udevadm
+# udevinfo -r -q name -n /dev/disk/by-id/scsi-360060e8015268c000001268c000065c0-part4
+# udevadm info --query=name --name /dev/disk/by-id/dm-name-vg_fedora-lv_root
+UdevQueryName=""
+type -p udevinfo >/dev/null && UdevQueryName="udevinfo -r -q name -n"
+type -p udevadm >/dev/null && UdevQueryName="udevadm info --query=name --name"
+[[ -z "$UdevQueryName" ]] && {
+	LogPrint "Could not find udevinfo nor udevadm (skip diskbyid_mappings)"
+	return
+	}
+
+ls /dev/disk/by-id | while read ID;
+do
+	ID_NEW=$($UdevQueryName /dev/disk/by-id/$ID)
+	echo $ID $ID_NEW
+done >$VAR_DIR/recovery/diskbyid_mappings  
+
+[[ -f $VAR_DIR/recovery/diskbyid_mappings ]] &&  Log "Saved diskbyid_mappings"