lxc-clone

--- lxc-clone.orig      2013-10-02 19:23:25.402039992 +0300
+++ lxc-clone   2013-10-02 19:28:54.320818235 +0300
@@ -191,6 +191,7 @@

 sed -i '/lxc.rootfs/d' $lxc_path/$lxc_new/config
 if [ -b $oldroot ]; then
+    tmproot=`mktemp -d`
     type vgscan || { echo "$(basename $0): lvm is not installed" >&2; false; }
     lvdisplay $oldroot > /dev/null 2>&1 || { echo "$(basename $0): non-lvm blockdev cloning is not supported" >&2; false; }
     lvm=TRUE
@@ -202,41 +203,28 @@
     if [ $lxc_size = "_unset" ]; then
         lxc_size=`lvdisplay $oldroot | grep Size | awk '{ print $3 $4 }'`
     fi
-    newlv="${lxc_lv_prefix}${lxc_new}_snapshot"
-    lvcreate -s -L $lxc_size -n $newlv $oldroot
-    type xfs_admin > /dev/null 2>&1 && {
-        # change filesystem UUID if it is an xfs filesystem
-        xfs_admin -u /dev/$lxc_vg/$newlv && xfs_admin -U generate /dev/$lxc_vg/$newlv
-    }

     if [ $container_running = "True" ]; then
         lxc-unfreeze -n $lxc_orig
         frozen=0
     fi
     if [ $snapshot = "no" ]; then
-        #mount snapshot
-        mkdir -p ${rootfs}_snapshot
-        mount /dev/$lxc_vg/${lxc_lv_prefix}${lxc_new}_snapshot ${rootfs}_snapshot || { echo "$(basename $0): failed to mount new rootfs_snapshot" >&2; false; }
-        #create a new lv
-        lvcreate -L $lxc_size $lxc_vg -n ${lxc_lv_prefix}$lxc_new
-        echo "lxc.rootfs = /dev/$lxc_vg/${lxc_lv_prefix}$lxc_new" >> $lxc_path/$lxc_new/config
-        # and mount it so we can tweak it
-        mkdir -p $rootfs
-        mkfs -t $fstype /dev/$lxc_vg/${lxc_lv_prefix}$lxc_new
-        mount /dev/$lxc_vg/${lxc_lv_prefix}$lxc_new $rootfs || { echo "$(basename $0): failed to mount new rootfs" >&2; false; }
-        mounted=1
-        rsync -ax ${rootfs}_snapshot/ ${rootfs}/ || { echo "$(basename $0): copying data to new lv failed" >&2; false; }
-        umount ${rootfs}_snapshot
-        rmdir ${rootfs}_snapshot
-        lvremove -f $lxc_vg/${lxc_lv_prefix}${lxc_new}_snapshot
+       lvconvert -m 1 $oldroot --alloc anywhere
+       lvconvert --splitmirrors 1 --name $lxc_new $oldroot
     else
+       newlv="${lxc_lv_prefix}${lxc_new}_snapshot"
+       lvcreate -s -L $lxc_size -n $newlv $oldroot
         lvrename $lxc_vg/${lxc_lv_prefix}${lxc_new}_snapshot $lxc_vg/${lxc_lv_prefix}$lxc_new
-        echo "lxc.rootfs = /dev/$lxc_vg/${lxc_lv_prefix}$lxc_new" >> $lxc_path/$lxc_new/config
-        # and mount it so we can tweak it
-        mkdir -p $rootfs
-        mount /dev/$lxc_vg/${lxc_lv_prefix}$lxc_new $rootfs || { echo "$(basename $0): failed to mount new rootfs" >&2; false; }
-        mounted=1
     fi
+    echo "lxc.rootfs = /dev/$lxc_vg/${lxc_lv_prefix}$lxc_new" >> $lxc_path/$lxc_new/config
+    type xfs_admin > /dev/null 2>&1 && {
+               # change filesystem UUID if it is an xfs filesystem
+               xfs_admin -u /dev/$lxc_vg/$newlv && xfs_admin -U generate /dev/$lxc_vg/$newlv
+    }
+    mkdir -p $tmproot
+    mount /dev/$lxc_vg/${lxc_lv_prefix}$lxc_new $tmproot || { echo "$(basename $0): failed to mount new rootfs" >&2; false; }
+    mounted=1
+    rootfs=$tmproot

 elif which btrfs >/dev/null 2>&1 && btrfs subvolume list $oldroot >/dev/null 2>&1; then
     # if oldroot is a btrfs subvolume, assume they want a snapshot