#!/bin/bash
# chkconfig: 345 20 80
# description: Create BTRFS subvolumes for LXC reference images.
#

# not needed -- Source function library
#. /etc/init.d/functions

# This is where sliceimage(s) store their reference images
sliceimage_dir=/vservers/.vref
lxc_dir=/vservers/.lvref

# Check if we are in the build environment
function check_node () {
    mount | grep -q 'planetlab-vservers' || exit 0
    [ -d $sliceimage_dir ] || { echo "No sliceimage installed" ; exit 1; }
}

function start () {

    check_node

    sliceimages=$(cd $sliceimage_dir ; ls )

    for sliceimage in $sliceimages; do
	mkdir -p $lxc_dir
	# already known to lxc - skip it 
        # xxx we need a smarter way to handle upgrades
	[ -d $lxc_dir/$sliceimage ] && continue
	
	btrfs subvolume create $lxc_dir/$sliceimage
        # what is that ?
	#btrfs subvolume create $lxc_dir/lxc-squeeze-x86_64
        # copy the slice image into the btrfs ?
	tar -C $sliceimage_dir -cf - $sliceimage | tar -C $lxc_dir -xf -
        # the original code trashed the ref image that came with an rpm
	#rm -rf /vservers/lxc-reference-${VERSION}.tgz
        # this would probably cause the image to be re-created upon yum update
        # or prevent updates to make it to the node ?
	#rm -rf $sliceimage_dir/$sliceimage
    done
}

function status () {
    echo -n "Checking node .. "
    check_node
    echo OK
    echo "From installed sliceimage variants"
    ls $sliceimage_dir
    echo "Exported to lxc"
    ls $lxc_dir
}

case "$1" in
    start|restart|reload)	start ; exit 0 ;;
    status)			status ; exit 0 ;;
    stop)			exit 0 ;;
    *)  echo $"Usage: $0 {start|stop|status}"
        exit 1
        ;;
esac