#!/bin/sh

#
# 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: $(basename $0) -n NAME [-f] [-P lxcpath]" >&2
}

help() {
    usage
    echo >&2
    echo "Remove an existing container on the system." >&2
    echo >&2
    echo "Options:" >&2
    echo "  -n NAME    specify the name of the container" >&2
    echo "  -f         stop the container if it is running (rather than abort)" >&2
    echo "  -P lxcpath container is in specified lxcpath" >&2
}

usage_err() {
    [ -n "$1" ] && echo "$1" >&2
    usage
    exit 1
}

optarg_check() {
    if [ -z "$2" ]; then
        usage_err "option '$1' requires an argument"
    fi
}

. /usr/share/lxc/lxc.functions
force=0

while [ $# -gt 0 ]; do
        opt="$1"
        shift
        case "$opt" in
            -h|--help)
                help
                exit 1
            ;;
            -n|--name)
                optarg_check "$opt" "$1"
                lxc_name=$1
                shift
            ;;
            -P|--lxcpath)
                optarg_check "$opt" "$1"
                lxc_path=$1
                shift
            ;;
            -f)
                force=1
            ;;
            --)
                break
            ;;
            -?)
                usage_err "unknown option '$opt'"
            ;;
            -*)
                # split opts -abc into -a -b -c
                set -- $(echo "${opt#-}" | sed 's/\(.\)/ -\1/g') "$@"
                ;;
            *)
            usage
            exit 1
            ;;
        esac
done

if [ -z "$lxc_name" ]; then
    echo "$(basename $0): no container name specified" >&2
    usage $0
    exit 1
fi

if [ "$(id -u)" != "0" ]; then
   echo "$(basename $0): must be run as root" >&2
   exit 1
fi

if [ ! -d "$lxc_path/$lxc_name" ]; then
    echo "$(basename $0): '$lxc_name' does not exist" >&2
    exit 1
fi

# make sure the container is stopped
if ! lxc-info -n $lxc_name -P $lxc_path --state-is "STOPPED"; then
    if [ $force -eq 1 ]; then
        lxc-stop -P $lxc_path -n $lxc_name
        lxc-wait -P $lxc_path -n $lxc_name -s STOPPED
    else
        echo "$(basename $0): '$lxc_name' $(lxc-info -P $lxc_path -n $lxc_name -s); aborted" >&2
        exit 1
    fi
fi

# Deduce the type of rootfs
# If LVM partition, destroy it. For btrfs, we delete the subvolue. If anything
# else, ignore it. We'll support deletion of others later.
rootdev=`grep lxc.rootfs $lxc_path/$lxc_name/config 2>/dev/null | sed -e 's/^[^/]*/\//'`
if [ -n "$rootdev" ]; then
    if [ -b "$rootdev" -o -h "$rootdev" ]; then
        lvdisplay $rootdev > /dev/null 2>&1
        if [ $? -eq 0 ]; then
            echo "removing backing store: $rootdev"
            lvremove -f $rootdev
        fi
    elif [ -h "$rootdev" -o -d "$rootdev" ]; then
        if which btrfs >/dev/null 2>&1 &&
           btrfs subvolume list "$rootdev" >/dev/null 2>&1; then
            btrfs subvolume delete "$rootdev"
        else
            # In case rootfs is not under $lxc_path/$lxc_name, remove it
            rm -rf --one-file-system --preserve-root $rootdev
        fi
    fi
fi

# recursively remove the container to remove old container configuration
rm -rf --one-file-system --preserve-root $lxc_path/$lxc_name