add vg and zfsroot options to lxc.functions and use in lxc-create

src/lxc/lxc-create.in

@@ -134,7 +134,8 @@ optarg_check() {
 backingstore=_unset
 fstype=ext4
 fssize=500M
-vgname=lxc
+vgname=$lxc_vg
+zfsroot=$lxc_zfsroot
 custom_rootfs=""
 
 while [ $# -gt 0 ]; do

src/lxc/lxc.functions.in

@@ -34,4 +34,24 @@ get_default_lxcpath() {
 	fi
 }
 
+get_default_vg() {
+	LXC_VG=$(grep -v "^#" "$globalconf" 2>/dev/null | grep "[ \t]*lvm_vg[ \t]*=") || true
+	if [ -n "$LXC_VG" ]; then
+		echo $LXC_VG | awk -F= '{ print $2 }'
+	else
+		echo "lxc"
+	fi
+}
+
+get_default_zfsroot() {
+	LXC_ZFSROOT=$(grep -v "^#" "$globalconf" 2>/dev/null | grep "[ \t]*zfsroot[ \t]*=") || true
+	if [ -n "$LXC_ZFSROOT" ]; then
+		echo $LXC_ZFSROOT | awk -F= '{ print $2 }'
+	else
+		echo "tank/lxc"
+	fi
+}
+
 lxc_path=`get_default_lxcpath`
+lxc_vg=`get_default_vg`
+lxc_zfsroot=`get_default_zfsroot`