vdo: more lvm_import_vdo fixes

Do not call 'dmsetup info' for non-dm devices.

Better handling for VGNAME and LVNAME - so when convering LV as
backend device automatically recognize it and reuse LV name for VDOLV.

Add prompt for final confirmation before actual conversion is started
(once confirmed, lvm2 commands no longer prompts to avoid leaving
conversion in the middle of its process.)

1 files changed, 41 insertions, 7 deletions

diff --git a/scripts/lvm_import_vdo.sh b/scripts/lvm_import_vdo.sh
index 685821f13..39a320c84 100755
--- a/scripts/lvm_import_vdo.sh
+++ b/scripts/lvm_import_vdo.sh
@@ -50,6 +50,7 @@ DM_DEV_DIR="${DM_DEV_DIR:-/dev}"
 DEVICENAME=""
 DEVMAJOR=0
 DEVMINOR=0
+PROMPTING=""
 
 DRY=0
 VERB=""
@@ -57,7 +58,8 @@ FORCE=""
 YES=""
 
 # default name for converted VG and its VDO LV
-NAME="vdovg/vdolvol"
+DEFAULT_NAME="vdovg/vdolvol"
+NAME=""
 
 # help message
 tool_usage() {
@@ -100,6 +102,7 @@ dry() {
 cleanup() {
 	trap '' 2
 
+	test -z "$PROMPTING" || echo "No"
 	rm -rf "$TEMPDIR"
 	# error exit status for break
 	exit "${1:-1}"
@@ -175,7 +178,9 @@ detect_lv_() {
 		;;
 	esac
 
-	DEV="$("$DMSETUP" info -c -j "$DEVMAJOR" -m "$DEVMINOR" -o uuid,name --noheadings --nameprefixes --separator ' ' 2>/dev/null)"
+	test "$DEVMAJOR" != "$(grep device-mapper /proc/devices | cut -f1 -d' ')" && return
+
+	DEV="$("$DMSETUP" info -c -j "$DEVMAJOR" -m "$DEVMINOR" -o uuid,name --noheadings --nameprefixes --separator ' ')"
 	case "$DEV" in
 	Device*)  ;; # no devices
 	*)	eval "$DEV" ;;
@@ -244,15 +249,31 @@ convert2lvm_() {
 	detect_lv_ "$DEVICE"
 	case "$DM_UUID" in
 		LVM-*)	eval "$("$DMSETUP" splitname --nameprefixes --noheadings --separator ' ' "$DM_NAME")"
-			if [ -z "$VGNAME" ] || [ "$VGNAME" = "$LVNAME" ]  ; then
+			if [ -z "$VGNAME" ] || [ "$VGNAME" = "$LVNAME" ] ; then
 				VGNAME=$DM_VG_NAME
-				LVNAME=$DM_LV_NAME
+				verbose "Using existing volume group name $VGNAME."
+				test -n "$LVNAME" || LVNAME=$DM_LV_NAME
 			elif test "$VGNAME" != "$DM_VG_NAME" ; then
-				error "Volume group name \"$VGNAME\" does not match name \"$DM_VG_NAME\" for device \"$DEVICE\"."
+				error "Volume group name \"$VGNAME\" does not match name \"$DM_VG_NAME\" for VDO device \"$DEVICE\"."
 			fi
 			;;
-		*) IS_LV=0
-			# Check $VGNANE does not already exists
+		*)	IS_LV=0
+			# Check if we need to generate unused $VGNANE
+			if [ -z "$VGNAME" ] || [ "$VGNAME" = "$LVNAME" ] ; then
+				VGNAME=${DEFAULT_NAME%/*}
+				# Find largest matching VG name to our 'default' vgname
+				LASTVGNAME=$(LC_ALL=C "$LVM" vgs -oname -O-name --noheadings -S name=~${VGNAME} | grep -E "$VGNAME[0-9]? ?" | head -1)
+				if test -n "$LASTVGNAME" ; then
+					LASTVGNAME=${LASTVGNAME#*${VGNAME}}
+					# If the number is becoming too high, try some random number
+					test "$LASTVGNAME" -gt 99999999 2>/dev/null && LASTVGNAME=$RANDOM
+					# Generate new unused VG name
+					VGNAME="${VGNAME}$(( ${LASTVGNAME} + 1 ))"
+					verbose "Selected unused volume group name $VGNAME."
+				fi
+			fi
+			# New VG is created, LV name should be always unused.
+			test -n "$LVNAME" || LVNAME=${DEFAULT_NAME#*/}
 			"$LVM" vgs "$VGNAME" >/dev/null 2>&1 && error "Cannot use already existing volume group name \"$VGNAME\"."
 			;;
 	esac
@@ -328,6 +349,19 @@ EOF
 )
 	verbose "VDO conversion paramaters: $PARAMS"
 
+	# If user has not provided '--yes', prompt before conversion
+	if test -z "$YES" ; then
+		PROMPTING=yes
+		echo -n "Convert VDO device \"$DEVICE\" to VDO LV \"$VGNAME/$LVNAME\"? [y|N]: "
+		read -n 1 -s ANSWER
+		case "${ANSWER:0:1}" in
+			y|Y )  echo "Yes" ;;
+			* )    echo "No" ; PROMPTING=""; exit ;;
+		esac
+		PROMPTING=""
+		YES="-y" # From now, now prompting
+	fi
+
 	verbose "Stopping VDO volume."
 	dry "$VDO" stop $VDOCONF --name "$VDONAME"