87 lines
1.6 KiB
Bash
87 lines
1.6 KiB
Bash
#!/bin/sh
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set -e
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mkdir -p /mnt/urbackup_snaps
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SNAP_ID=$1
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SNAP_MOUNTPOINT="$2"
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SNAP_DEST=/mnt/urbackup_snaps/$SNAP_ID
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DEVICE=$(df -T -P | egrep " ${SNAP_MOUNTPOINT}\$" | head -n 1 | tr -s " " | cut -d" " -f1)
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TYPE=$(df -T -P | egrep " ${SNAP_MOUNTPOINT}\$" | head -n 1 | tr -s " " | cut -d" " -f2)
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if [ "x$DEVICE" = "x" ]
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then
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echo "Cannot get device for filesystem $SNAP_MOUNTPOINT"
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exit 1
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fi
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echo "Snapshotting device $DEVICE via dattobd..."
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NUM=0
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while [ -e "/dev/datto$NUM" ]
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do
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NUM=`expr $NUM + 1`
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done
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if ! modprobe dattobd
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then
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echo "Dattobd kernel module not available"
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exit 1
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fi
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echo "Using /dev/datto$NUM..."
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sync
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dbdctl setup-snapshot "$DEVICE" "$SNAP_MOUNTPOINT/.datto_$SNAP_ID" $NUM
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echo $NUM > ${SNAP_DEST}-num
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DEV_SIZE=`blockdev --getsize /dev/datto$NUM`
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truncate -s100M $SNAP_MOUNTPOINT/.overlay_$SNAP_ID
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LODEV=`losetup -f`
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if [ "x$LODEV" = x ]
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then
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rm "${SNAP_DEST}-num"
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rm $SNAP_MOUNTPOINT/.overlay_$SNAP_ID
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dbdctl destroy $NUM
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exit 1
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fi
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losetup $LODEV $SNAP_MOUNTPOINT/.overlay_$SNAP_ID
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echo "0 $DEV_SIZE snapshot /dev/datto$NUM $LODEV N 8" | dmsetup create "wsnap-$SNAP_ID"
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echo "Mounting /dev/mapper/wsnap-$SNAP_ID..."
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mkdir -p $SNAP_DEST
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MOUNTOPTS="ro"
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if [ $TYPE = "xfs" ]
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then
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MOUNTOPTS="ro,nouuid"
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fi
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if ! mount -o $MOUNTOPTS /dev/mapper/wsnap-$SNAP_ID $SNAP_DEST
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then
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echo "Mounting filesystem failed"
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rmdir "$SNAP_DEST"
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rm "${SNAP_DEST}-num"
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dmsetup remove "wsnap-$SNAP_ID"
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losetup -d $LODEV
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rm $SNAP_MOUNTPOINT/.overlay_$SNAP_ID
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dbdctl destroy $NUM
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exit 1
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fi
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echo "SNAPSHOT=$SNAP_DEST"
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exit 0 |