#! /bin/bash
VERSION="0.3.0"

VSERVER="/usr/sbin/vserver"

usage ()
{
    cat <<EOF 1>&2
usage:  ${0##*/} s_context sys_call [arguments...]
        (see --help for more information)
EOF
}
full_usage ()
{
        cat <<EOF
Usage:  ${0##*/} s_context sys_call [arguments...]
e.g.	${0##*/} 42 sys_reboot restart|halt

This is the userspace helper that handles a call to the kernel
reboot(2) for s_contexts and vservers and is probably not designed
to be used directly by humans.

Currently expects to call "$VSERVER restart|stop".

Options:
        -h, --help              this help
        -V, --version           copyright and version information

EOF
}
full_version ()
{
    cat <<EOF
${0##*/} version $VERSION
Copyright (c) 2002 Paul Sladen   <vserver@paul.sladen.org>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at
your option) any later version.

EOF
}
parse_args ()
{
	case "$1" in
	    --help|-h)
		full_usage
		shift
		exit 0
		;;
	    --version|-V)
		full_version
		shift
		exit 0
		;;
	    [1-9]*)
		case "$2" in
		    sys_reboot)
			case "$3" in
			    restart)
				# hum, we can't exec() if we want to restart it...
				do_vserver_number "$1" kill
				do_vserver_number "$1" start
				return
			    ;;
			    halt)
				do_vserver_number "$1" kill
				return
			    ;;
			    *)
				echo "${0##*/} error: third argument must be an action." 1>&2
				echo 'e.g. "restart" or "halt"  (try --help)' 1>&2
				shift 3
				exit 1
			    ;;
			esac
			;;
		    sys_quotactl)
			echo "${0##*/} error: I know how to handle qutoas yet... :)" 1>&2
			echo 'e.g. {the code needs writing!}  (try --help)' 1>&2
			shift 2
			exit 1
			;;
		    *)
			echo "${0##*/} error: second argument must be a handled sys_call." 1>&2
			echo 'e.g. "sys_reboot"  (try --help)' 1>&2
			shift 2
			exit 1
		    ;;
		esac
		;;
	    *)
		usage
		echo "${0##*/} error: first argument must be a non-zero s_context number" 1>&2
		echo "e.g. 42" 1>&2
		shift
		exit 1
	    ;;
	esac
}

# call this one with an s_context number
do_vserver_number ()
{

    HOSTNAME=`grep -l "=$1" /var/run/vservers/* | sed -e 's/.*\/\(.*\).ctx/\1/;q'`
    # we can't exec() if we want to run another command to restart it...
    "$VSERVER" "$HOSTNAME" "$2"
}

parse_args $@