#!/bin/bash

#
# lxc: linux Container library

# Authors:
# Daniel Lezcano <daniel.lezcano@free.fr>

# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.

# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.

# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

#
# This script allows to set or remove the capabilities on the lxc tools.
# When the capabilities are set, a non root user can manage the containers.
#

usage() {
    echo "usage: lxc-create -n <name> [-f configuration] [-t template] [-h]"
}

help() {
    usage
    echo
    echo "creates a lxc system object."
    echo
    echo "Options:"
    echo "name         : name of the container"
    echo "configuration: lxc configuration"
    echo "template     : lxc-template is an accessible template script"
}

shortoptions='hn:f:t:'
longoptions='help,name:,config:,template:'
lxc_path=@LXCPATH@
bindir=@BINDIR@

getopt=$(getopt -o $shortoptions --longoptions  $longoptions -- "$@")
if [ $? != 0 ]; then
    usage
    exit 1;
fi

eval set -- "$getopt"

while true; do
        case "$1" in
	    -h|--help)
		help
		exit 1
		;;
	    -n|--name)
		shift
		lxc_name=$1
		shift
		;;
	    -f|--config)
		shift
		lxc_config=$1
		shift
		;;
	    -t|--template)
		shift
		lxc_template=$1
		shift
		;;
            --)
		shift
		break;;
            *)
		echo $1
		usage
		exit 1
		;;
        esac
done

if [ -z "$lxc_path" ]; then
    echo "no configuration path defined !"
    exit 1
fi

if [ ! -r $lxc_path ]; then
    echo "configuration path '$lxc_path' not found"
    exit 1
fi

if [ -z "$lxc_name" ]; then
    echo "no container name specified"
    usage
    exit 1
fi

if [ "$(id -u)" != "0" ]; then
   echo "This command has to be run as root"
   exit 1
fi

if [ ! -r $lxc_path ]; then
    echo "no configuration path defined !"
    exit 1
fi

if [ -d "$lxc_path/$lxc_name" ]; then
    echo "'$lxc_name' already exists"
    exit 1
fi

trap "${bindir}/lxc-destroy -n $lxc_name; echo aborted; exit 1" SIGHUP SIGINT SIGTERM

mkdir -p $lxc_path/$lxc_name

if [ -z "$lxc_config" ]; then
    touch $lxc_path/$lxc_name/config
else
    if [ ! -r "$lxc_config" ]; then
	echo "'$lxc_config' configuration file not found"
	exit 1
    fi

    cp $lxc_config $lxc_path/$lxc_name/config
fi

if [ ! -z $lxc_template ]; then

    type ${bindir}/lxc-$lxc_template >/dev/null
    if [ $? -ne 0 ]; then
	echo "unknown template '$lxc_template'"
	${bindir}/lxc-destroy -n $lxc_name
	exit 1
    fi

    if [ -z "$lxc_config" ]; then
	echo
	echo "Warning:"
	echo "-------"
	echo "Usually the template option is called with a configuration"
	echo "file option too, mostly to configure the network."
	echo "eg. lxc-create -n foo -f lxc.conf -t debian"
	echo "The configuration file is often:"
	echo
	echo "lxc.network.type=macvlan"
	echo "lxc.network.link=eth0"
	echo "lxc.network.flags=up"
	echo
	echo "or alternatively:"
	echo
	echo "lxc.network.type=veth"
	echo "lxc.network.link=br0"
	echo "lxc.network.flags=up"
	echo
	echo "For more information look at lxc.conf (5)"
	echo
	echo "At this point, I assume you know what you do."
	echo "Press <enter> to continue ..."
	read dummy
    fi

    ${bindir}/lxc-$lxc_template --path=$lxc_path/$lxc_name --name=$lxc_name
    if [ $? -ne 0 ]; then
	echo "failed to execute template '$lxc_template'"
	${bindir}/lxc-destroy -n $lxc_name
	exit 1
    fi

    echo "'$lxc_template' template installed"
fi

echo "'$lxc_name' created"