add support for qcow2 vm images

templates/backup-vm.j2

@@ -20,6 +20,11 @@ set -euo pipefail
 			SNAPSHOT="/dev/$VG/backup-$DEVICE"
 			lvremove -f "$SNAPSHOT" > /dev/null 2>&1 || true
 		done
+		for i in $DISKS_QCOW2; do
+			extract_lvm_qcow2
+			SNAPSHOT="/dev/$VG/backup-$DEVICE"
+			lvremove -f "$SNAPSHOT" > /dev/null 2>&1 || true
+		done
 	}
 
 	function cleanup_vmmount {
@@ -35,6 +40,16 @@ set -euo pipefail
 		LV=`lvs --noheadings -o lv_name "$DISK" | tr -d ' '`
 	}
 
+	function extract_lvm_qcow2 {
+		DISK=`echo $i | awk -F, '{print $1}'`
+		DEVICE=`echo $i | awk -F, '{print $2}'`
+		DEVICEPATH=`df "$DISK" | awk '{print $1}' | tail -n1`
+		MOUNTPOINT=`df "$DISK" | awk '{print $6}' | tail -n1`
+		RELIMAGEPATH="${DISK#$MOUNTPOINT}"
+		VG=`lvs --noheadings -o vg_name "$DEVICEPATH" | tr -d ' '`
+		LV=`lvs --noheadings -o lv_name "$DEVICEPATH" | tr -d ' '`
+	}
+
 	function backup_vm {
 		# get a list of disks
 		DISKS=`virsh domblklist "$DOMAIN" --details \
@@ -42,7 +57,13 @@ set -euo pipefail
 			| grep ^block \
 			| grep -v swap \
 			| awk '{printf "%s,%s ",$4, $3}'`
-		echo "backing up $DOMAIN:  $DISKS"
+		DISKS_QCOW2=`virsh domblklist "$DOMAIN" --details \
+			| sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//' \
+			| grep ^file \
+			| grep -v swap \
+			| grep '.qcow2' \
+			| awk '{printf "%s,%s ",$4, $3}'`
+		echo "backing up $DOMAIN:  $DISKS $DISKS_QCOW2"
 
 		trap "unfreeze_vm || true; delete_snapshots" INT TERM EXIT
 
@@ -58,6 +79,12 @@ set -euo pipefail
 			lvcreate -L16G -s -n "backup-$DEVICE" "$DISK" > /dev/null
 		done
 
+		# create snapshots of all volumes containing qcow2 images
+		for i in $DISKS_QCOW2; do
+			extract_lvm_qcow2
+			lvcreate -L16G -s -n "backup-$DEVICE" "$DEVICEPATH" > /dev/null
+		done
+
 		# dump vm config
 		virsh dumpxml "$DOMAIN" > "$DOMAIN_MOUNTBASE/config.xml"
 
@@ -76,6 +103,21 @@ set -euo pipefail
 			) 2> /dev/null
 		done
 
+		# mount qcow2 disk images backing storage
+		for i in $DISKS_QCOW2; do
+			extract_lvm_qcow2
+			SNAPSHOT="/dev/$VG/backup-$DEVICE"
+			fsck -y "$SNAPSHOT" > /dev/null 2> /dev/null
+			(
+				mkdir "$DOMAIN_MOUNTBASE/IMAGECONTAINER_$DEVICE"
+				# to be able to run fsck inside the vm we have to mount the containers r/w
+				mount -o rw "$SNAPSHOT" "$DOMAIN_MOUNTBASE/IMAGECONTAINER_$DEVICE"
+
+				mkdir "$DOMAIN_MOUNTBASE/$DEVICE"
+				guestmount -m /dev/sda -a "$DOMAIN_MOUNTBASE/IMAGECONTAINER_$DEVICE/$RELIMAGEPATH" "$DOMAIN_MOUNTBASE/$DEVICE"
+			) 2> /dev/null
+		done
+
 {% if backup_backend == 'restic' %}
 		# restic backend
 		source /etc/backup-client/restic.env
@@ -83,6 +125,7 @@ set -euo pipefail
 			--verbose \
 			--host "$DOMAIN" \
 			--exclude-file "/etc/backup-client/vms/$DOMAIN/exclude_files" \
+			--exclude="$DOMAIN_MOUNTBASE/IMAGECONTAINER_*" \
 			"$DOMAIN_MOUNTBASE"
 {% endif %}