Subversion Repositories openrisc_2011-10-31

#!/bin/bash

# Copyright (C) 2010 Embecosm Limited

# Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>

# A script to get the IP of the next available Linux session

# 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 3 of the License, or (at your option)

# any later version.

# This program 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 General Public License for

# more details.

# You should have received a copy of the GNU General Public License along

# with this program.  If not, see <http://www.gnu.org/licenses/>.

# ------------------------------------------------------------------------------

# Usage

# ./get-ip.sh [--rotate] [--delete <ip_address>]

# Get the top IP address from a file of addresses, rotating it to the bottom

# of the file if --rotate is specified. Delete the given IP address if

# --delete is specified.

ipfile=`dirname ${DEJAGNU}`/ip-avail.txt

tmp=/tmp/get-ip-$$

lockfile=`dirname ${DEJAGNU}`/get-ip-lockfile

arg1=$1

arg2=$2

# Lock all the file manipulation.

(

    flock -e 200

    # Check we have an IP address available

    if [ ! -s ${ipfile} ]

    then

        echo "No IP addresses available" >&2

        exit 255

    fi

    # Get the top IP address

    ip=`head -1 ${ipfile}`

    # Optionally move it to the bottom of the IP file or delete it

    if [ "x--rotate" == "x${arg1}" ]

    then

        tail -n +2 ${ipfile} > ${tmp}

        echo ${ip} >> ${tmp}

        mv ${tmp} ${ipfile}

    fi

    if [ "x--delete" == "x${arg1}" ]

    then

        sed -i ${ipfile} -e "/${arg2}/d"

    fi

    # Echo the IP address unless we are deleting

    if [ "x--delete" != "x${arg1}" ]

    then

        echo ${ip}

    fi

) 200> ${lockfile}