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[/] [openrisc/] [trunk/] [gnu-stable/] [get-ip.sh] - Blame information for rev 856

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Line No. Rev Author Line
1 548 jeremybenn
#!/bin/bash
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# Copyright (C) 2010 Embecosm Limited
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# Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>
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# A script to get the IP of the next available Linux session
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# This program is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by the Free
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# Software Foundation; either version 3 of the License, or (at your option)
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# any later version.
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# This program is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
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# more details.
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# You should have received a copy of the GNU General Public License along
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# with this program.  If not, see <http://www.gnu.org/licenses/>.
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# ------------------------------------------------------------------------------
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# Usage
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# ./get-ip.sh [--rotate] [--delete <ip_address>]
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# Get the top IP address from a file of addresses, rotating it to the bottom
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# of the file if --rotate is specified. Delete the given IP address if
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# --delete is specified.
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ipfile=`dirname ${DEJAGNU}`/ip-avail.txt
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tmp=/tmp/get-ip-$$
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lockfile=`dirname ${DEJAGNU}`/get-ip-lockfile
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arg1=$1
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arg2=$2
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# Lock all the file manipulation.
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(
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    flock -e 200
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    # Check we have an IP address available
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    if [ ! -s ${ipfile} ]
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    then
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        echo "No IP addresses available" >&2
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        exit 255
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    fi
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    # Get the top IP address
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    ip=`head -1 ${ipfile}`
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    # Optionally move it to the bottom of the IP file or delete it
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    if [ "x--rotate" == "x${arg1}" ]
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    then
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        tail -n +2 ${ipfile} > ${tmp}
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        echo ${ip} >> ${tmp}
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        mv ${tmp} ${ipfile}
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    fi
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    if [ "x--delete" == "x${arg1}" ]
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    then
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        sed -i ${ipfile} -e "/${arg2}/d"
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    fi
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    # Echo the IP address unless we are deleting
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    if [ "x--delete" != "x${arg1}" ]
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    then
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        echo ${ip}
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    fi
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) 200> ${lockfile}

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