add mkoverlay

mkoverlay

+#!/bin/bash
+if [ "$1" = "" ]; then
+cat<<EOF
+mkoverlay [_corezone] [targetzone] [copyopts]
+
+ Converts a flat dir zone to an overlay zone based on the specified core zone.
+EOF
+exit 0
+fi
+
+COREZONE=""
+if [ "$2" != "" ]; then
+ COREZONE=$1
+ shift
+fi
+
+if [ "$COREZONE" != "" ]; then
+ zone start $COREZONE || true
+ inzones $COREZONE "apt -y update; apt -y upgrade"
+ zone stop $COREZONE || true
+fi
+zone start $1; sleep 1 || true
+inzones $1 "apt -y update; apt -y upgrade"
+zone stop $1; sleep 1 || true
+
+cp -avu /zone/$1/. /zone/${1}.bak/
+zfs umount Z/zone/$1
+zfs list -t all
+rm -rf /zone/$1
+
+if [ "$COREZONE" = "" ]; then
+ lxc-destroy -l DEBUG -fs -n $1; sleep 1 || true
+ zfs destroy -R $(zfs list -t snapshot | grep @$1 | cut -d' ' -f1) || true
+ lxc-create -l DEBUG -n $1 -B zfs -t none; sleep 1 || true
+ zfs create -o mountpoint=/zone/$1/rootfs Z/zone/$1 || true
+ lxc-stop -l DEBUG -n $1 || true
+else
+ lxc-destroy -l DEBUG -fs -n $1; sleep 1 || true
+ zfs destroy -R $(zfs list -t snapshot | grep @$1 | cut -d' ' -f1) || true
+ lxc-copy -l DEBUG -n $COREZONE -N $1 -p /zone/ -B zfs -s
+ if [ $? -ne 0 ]; then
+  mv /zone/${1}.bak /zone/$1
+  exit 1
+ fi
+ lxc-stop -l DEBUG -n $1 || true
+fi
+zfs mount Z/zone/$1
+mkdir -p /opt/zone/$1
+sed -i "s/= \/zone\//= zfs:\/zone\//" /zone/$1/config
+sed -i "s/dir:\/zone\//zfs:\/zone\//" /zone/$1/config
+sed -i "s/zone\/\@/zone\/\_/" /zone/$1/config
+zone start $1
+rsync -av --progress /zone/$1.bak/rootfs/. /zone/$1/rootfs/
+cp -v /zone/$1.bak/* /zone/$1/
+zone restart $1
+
+echo ""
+echo "Verify the functionality of the zone, then"
+echo " rm -rf /zone/$1.bak"
+echo "if you are satisfied."