diff -r cffc45cd7e69 -r 006cedfc3ce2 examples/backup
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/examples/backup	Fri Sep 16 11:23:46 2011 +0200
@@ -0,0 +1,91 @@
+#! /bin/bash -e
+
+export TMPDIR=/var/tmp
+export LC_ALL=C
+
+SNAPSIZE=1G
+DST=${1?need destination folder}
+VG=`hostname`
+DEV=/dev/sda1
+NICE=
+
+now=`date +%s`
+tmp=`mktemp`
+snaps=`mktemp`
+
+_lvremove() {
+	local dev=$1
+	local vg=${dev%/*}
+	local lv=${dev#*/}
+
+	udevadm settle || true
+	lvremove -f "$dev" || {
+		dmsetup remove /dev/$vg/$lv \
+		&& udevadm settle \
+		&& dmsetup remove /dev/$vg/$lv-cow \
+		&& udevadm settle \
+		&& lvremove -f "$dev" || true
+	}
+}
+
+cleanup() {
+
+	while read lvm dev orig cleanup; do
+		udevadm settle
+		test -e "$dev" && test "$cleanup" || continue
+		eval $cleanup || true
+	done < $snaps
+
+	rm -f $tmp $snaps
+}
+
+trap cleanup EXIT INT
+
+for dev in $DEV; do
+	if mount -o remount,ro $dev; then
+		echo "- $tmp - rm -fv $tmp" >>$snaps
+		cp -v $dev $tmp
+		mount -o remount,rw $dev
+		file -s $tmp | egrep -q "ext[234] filesystem" && e2fsck -C0 -f -y $tmp || true
+		imager save --now=$now -z $tmp:$dev $DST
+		rm -f $tmp
+	fi
+done
+
+
+lvs -o vg_name,lv_name,origin --noheadings $VG | while read vg lv origin; do
+	# LVM-name DEV-name ORIG-name (cleanup)
+
+	orig="$vg/$lv"
+	if test "$origin"; then
+		dev="/dev/$vg/$lv"
+		echo "$vg/$lv $dev $dev" >>$snaps
+		continue
+	fi
+	snap="$vg/$lv.snap.$now"
+	dev="/dev/$vg/$lv.snap.$now"
+	lvcreate -s -L $SNAPSIZE -n "$snap" "$orig"
+	echo "$snap $dev /dev/$vg/$lv _lvremove $snap" >>$snaps
+done
+
+udevadm settle
+
+while read snap dev name cleanup; do
+	test "$snap" = "-" && continue
+	for a in 1 2 3; do
+		file -s `readlink -f $dev` | egrep -q "ext[234] filesystem" && $NICE fsck -y "$dev" && break
+		case $? in
+			32)	exit;;
+			*)	true;;
+		esac
+	done
+	if test $? = 0; then
+		$NICE imager save --now=$now -z $dev:$name $DST 
+		case `lvs -o snap_percent --noheadings "$snap"` in
+			100*)	echo "****************** $snap is full!";;
+		esac
+	fi
+	test "$cleanup" && eval $cleanup || true
+done <$snaps
+date
+date  >/var/log/backup.done