lxc-clone: change uuid on xfs

Otherwise after cloning an lvm+xfs container you can't run the original and clone at the same time. Based on a patch by Maurizio Sambati posted at https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/1013549Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>

lxc-clone: change uuid on xfs
8b892c55 · Serge Hallyn · Stéphane Graber · 60a742e0 · 8b892c55
Commit 8b892c55 authored Jul 19, 2012 by Serge Hallyn Committed by Stéphane Graber Oct 25, 2012
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lxc-clone.in src/lxc/lxc-clone.in +7 -1

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--- a/src/lxc/lxc-clone.in
+++ b/src/lxc/lxc-clone.in
@@ -203,7 +203,13 @@ if [ -b $oldroot ]; then
    if [ $lxc_size = "_unset" ]; then
        lxc_size=`lvdisplay $oldroot | grep Size | awk '{ print $3 $4 }'`
    fi
-    lvcreate -s -L $lxc_size -n ${lxc_lv_prefix}${lxc_new}_snapshot $oldroot
+    newlv="${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