mirror of
git://github.com/lxc/lxc
synced 2025-09-05 04:29:33 +00:00
lxc-clone: support btrfs and clean up safely
btrfs support from Scott Moser. Signed-off-by: Serge Hallyn <serge.hallyn@canonical.com> Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
This commit is contained in:
Ubuntu
Daniel Lezcano
@@ -21,6 +21,8 @@
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# License along with this library; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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set -e
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usage() {
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echo "usage: lxc-clone -o <orig> -n <new> [-s] [-h] [-L fssize] [-v vgname] [-p lxc_lv_prefix] [-t fstype]"
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}
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@@ -61,48 +63,49 @@ eval set -- "$getopt"
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while true; do
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case "$1" in
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-h|--help)
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help
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exit 1
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;;
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-s|--snapshot)
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shift
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snapshot=yes
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snapshot_opt="-s"
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;;
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-o|--orig)
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shift
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lxc_orig=$1
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shift
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;;
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-L|--fssize)
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shift
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lxc_size=$1
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shift
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;;
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-v|--vgname)
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shift
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lxc_vg=$1
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shift
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;;
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-n|--new)
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shift
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lxc_new=$1
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shift
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;;
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-p|--lvprefix)
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shift
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lxc_lv_prefix=$1
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shift
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;;
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--)
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shift
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break;;
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*)
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echo $1
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usage
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exit 1
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;;
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-h|--help)
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help
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exit 1
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;;
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-s|--snapshot)
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shift
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snapshot=yes
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snapshot_opt="-s"
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;;
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-o|--orig)
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shift
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lxc_orig=$1
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shift
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;;
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-L|--fssize)
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shift
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lxc_size=$1
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shift
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;;
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-v|--vgname)
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shift
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lxc_vg=$1
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shift
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;;
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-n|--new)
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shift
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lxc_new=$1
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shift
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;;
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-p|--lvprefix)
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shift
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lxc_lv_prefix=$1
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shift
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;;
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--)
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shift
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break
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;;
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*)
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echo $1
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usage
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exit 1
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;;
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esac
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done
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@@ -148,10 +151,27 @@ if [ -d "$lxc_path/$lxc_new" ]; then
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exit 1
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fi
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trap "${bindir}/lxc-destroy -n $lxc_new; echo aborted; exit 1" SIGHUP SIGINT SIGTERM
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mounted=0
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frozen=0
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oldroot=`grep lxc.rootfs $lxc_path/$lxc_orig/config | awk -F= '{ print $2 '}`
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cleanup() {
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if [ -b $oldroot ]; then
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if [ $mounted -eq 1 ]; then
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umount $rootfs || true
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fi
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lvremove -f $rootdev || true
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fi
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${bindir}/lxc-destroy -n $lxc_new || true
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if [ $frozen -eq 1 ]; then
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lxc-unfreeze -n $lxc_orig
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fi
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echo aborted
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exit 1
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}
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trap cleanup SIGHUP SIGINT SIGTERM
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mkdir -p $lxc_path/$lxc_new
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hostname=$lxc_new
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echo "Tweaking configuration"
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@@ -168,92 +188,79 @@ fi
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echo "Copying rootfs..."
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rootfs=$lxc_path/$lxc_new/rootfs
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# First figure out if the old is a device. For now we only support
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# lvm devices.
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mounted=0
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#is container running
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lxc-info -s -n $lxc_orig|grep RUNNING >/dev/null 2>&1
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if [ $? -ne 0 ]; then
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container_running=True
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else
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container_running=False
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fi
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container_running=True
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lxc-info -s -n $lxc_orig|grep RUNNING >/dev/null 2>&1 || container_running=False
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sed -i '/lxc.rootfs/d' $lxc_path/$lxc_new/config
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oldroot=`grep lxc.rootfs $lxc_path/$lxc_orig/config | awk -F= '{ print $2 '}`
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if [ -b $oldroot ]; then
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# this is a device. If we don't want to snapshot, then mkfs, mount
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# and rsync. Trivial but not yet implemented
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#if [ $snapshot == "no" ]; then
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# echo "non-snapshot and non-lvm clone of block device not yet implemented"
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# exit 1
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#fi
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lvdisplay $oldroot > /dev/null 2>&1
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if [ $? -ne 0 ]; then
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lvm=False
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echo "non-lvm block device cloning not yet implemented"
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exit 1
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else
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lvm=TRUE
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fi
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# ok, create a snapshot of the lvm device
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if [ $container_running == "True" ]; then
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lxc-freeze -n $lxc_orig
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fi
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lvcreate -s -L $lxc_size -n ${lxc_lv_prefix}${lxc_new}_snapshot $oldroot
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RETVAL=$?
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if [ $container_running == "True" ]; then
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lxc-unfreeze -n $lxc_orig
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fi
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if [ $RETVAL -ne 0 ]; then
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echo "snapshot creation failed"
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exit 1
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fi
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if [ $snapshot == "no" ]; then
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#mount snapshot
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mkdir -p ${rootfs}_snapshot
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mount /dev/$lxc_vg/${lxc_lv_prefix}${lxc_new}_snapshot ${rootfs}_snapshot || { echo "failed to mount new rootfs_snapshot"; exit 1; }
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#create a new lv
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lvcreate -L $lxc_size $lxc_vg -n ${lxc_lv_prefix}$lxc_new
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echo "lxc.rootfs = /dev/$lxc_vg/${lxc_lv_prefix}$lxc_new" >> $lxc_path/$lxc_new/config
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# and mount it so we can tweak it
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mkdir -p $lxc_path/$lxc_new/rootfs
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mkfs -t $fstype /dev/$lxc_vg/${lxc_lv_prefix}$lxc_new
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mount /dev/$lxc_vg/${lxc_lv_prefix}$lxc_new $rootfs || { echo "failed to mount new rootfs"; exit 1; }
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mounted=1
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rsync -ax ${rootfs}_snapshot/ ${rootfs}/ || { echo "copy of data to new lv failed"; exit 1; }
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umount ${rootfs}_snapshot || { echo "failed to unmount new rootfs_snapshot"; exit 1; }
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rm -rf ${rootfs}_snapshot
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lvremove -f $lxc_vg/${lxc_lv_prefix}$lxc_new || echo "failed to remove the snapshot"
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else
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lvrename $lxc_vg/${lxc_lv_prefix}}${lxc_new}_snapshot $lxc_vg/${lxc_lv_prefix}$lxc_new
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echo "lxc.rootfs = /dev/$lxc_vg/${lxc_lv_prefix}$lxc_new" >> $lxc_path/$lxc_new/config
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# and mount it so we can tweak it
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mkdir -p $lxc_path/$lxc_new/rootfs
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mount /dev/$lxc_vg/${lxc_lv_prefix}$lxc_new $rootfs || { echo "failed to mount new rootfs"; exit 1; }
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mounted=1
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fi
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type vgscan || { echo "Please install lvm"; false; }
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lvdisplay $oldroot > /dev/null 2>&1 || { echo "non-lvm blockdev cloning not supported"; false; }
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lvm=TRUE
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# ok, create a snapshot of the lvm device
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if [ $container_running = "True" ]; then
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lxc-freeze -n $lxc_orig
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frozen=1
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fi
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lvcreate -s -L $lxc_size -n ${lxc_lv_prefix}${lxc_new}_snapshot $oldroot
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if [ $container_running = "True" ]; then
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lxc-unfreeze -n $lxc_orig
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frozen=0
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fi
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if [ $snapshot = "no" ]; then
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#mount snapshot
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mkdir -p ${rootfs}_snapshot
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mount /dev/$lxc_vg/${lxc_lv_prefix}${lxc_new}_snapshot ${rootfs}_snapshot || { echo "failed to mount new rootfs_snapshot"; false; }
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#create a new lv
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lvcreate -L $lxc_size $lxc_vg -n ${lxc_lv_prefix}$lxc_new
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echo "lxc.rootfs = /dev/$lxc_vg/${lxc_lv_prefix}$lxc_new" >> $lxc_path/$lxc_new/config
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# and mount it so we can tweak it
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mkdir -p $lxc_path/$lxc_new/rootfs
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mkfs -t $fstype /dev/$lxc_vg/${lxc_lv_prefix}$lxc_new
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mount /dev/$lxc_vg/${lxc_lv_prefix}$lxc_new $rootfs || { echo "failed to mount new rootfs"; false; }
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mounted=1
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rsync -ax ${rootfs}_snapshot/ ${rootfs}/ || { echo "copy of data to new lv failed"; false; }
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umount ${rootfs}_snapshot
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rmdir ${rootfs}_snapshot
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lvremove -f $lxc_vg/${lxc_lv_prefix}${lxc_new}_snapshot
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else
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lvrename $lxc_vg/${lxc_lv_prefix}${lxc_new}_snapshot $lxc_vg/${lxc_lv_prefix}$lxc_new
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echo "lxc.rootfs = /dev/$lxc_vg/${lxc_lv_prefix}$lxc_new" >> $lxc_path/$lxc_new/config
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# and mount it so we can tweak it
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mkdir -p $lxc_path/$lxc_new/rootfs
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mount /dev/$lxc_vg/${lxc_lv_prefix}$lxc_new $rootfs || { echo "failed to mount new rootfs"; false; }
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mounted=1
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fi
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elif out=$(btrfs subvolume list "$lxc_path/$lxc_orig/rootfs" 2>&1); then
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out=$(btrfs subvolume snapshot "$lxc_path/$lxc_orig/rootfs" "$rootfs" 2>&1) || { echo "failed btrfs snapshot"; false; }
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echo "lxc.rootfs = $rootfs" >> "$lxc_path/$lxc_new/config"
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else
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if [ $container_running == True ];then
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lxc-freeze -n $lxc_orig
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fi
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rsync -ax $lxc_path/$lxc_orig/rootfs $lxc_path/$lxc_new/rootfs
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RETVAL=$?
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if [ $container_running == True ];then
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lxc-unfreeze -n $lxc_orig
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fi
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if [ RETVAL -ne 0 ]; then
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echo "copying rootfs failed"
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exit 1
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fi
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echo "lxc.rootfs = $rootfs" >> $lxc_path/$lxc_new/config
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if [ $snapshot = "yes" ]; then
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echo "Can't snapshot a directory"
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cleanup
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fi
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if [ $container_running = "True" ]; then
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lxc-freeze -n $lxc_orig
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frozen=1
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fi
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mkdir -p $lxc_path/$lxc_new/rootfs/
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rsync -ax $lxc_path/$lxc_orig/rootfs/ $lxc_path/$lxc_new/rootfs/
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echo "lxc.rootfs = $rootfs" >> $lxc_path/$lxc_new/config
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if [ $container_running = "True" ]; then
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lxc-unfreeze -n $lxc_orig
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frozen=0
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fi
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fi
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echo "Updating rootfs..."
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# so you can 'ssh $hostname.' or 'ssh $hostname.local'
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if [ -f $rootfs/etc/dhcp/dhclient.conf ]; then
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sed -i "s/send host-name.*$/send host-name \"$hostname\";/" $rootfs/etc/dhcp/dhclient.conf
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sed -i "s/send host-name.*$/send host-name \"$hostname\";/" $rootfs/etc/dhcp/dhclient.conf
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fi
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# set the hostname
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@@ -267,7 +274,7 @@ EOF
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# if this was a block device, then umount it now
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if [ $mounted -eq 1 ]; then
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umount $rootfs
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umount $rootfs
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fi
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echo "'$lxc_new' created"
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