90 lines
2.6 KiB
Plaintext
90 lines
2.6 KiB
Plaintext
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#!/bin/bash
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#
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# Create a "bank" of tap network devices that can be used by the
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# runqemu script. This script needs to be run as root, and will
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# use the tunctl binary from the build system sysroot. Note: many Linux
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# distros these days still use an older version of tunctl which does not
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# support the group permissions option, hence the need to use the build
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# system provided version.
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#
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# Copyright (C) 2010 Intel Corp.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 2 as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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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, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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usage() {
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echo "Usage: sudo $0 <gid> <num> <native-sysroot-basedir>"
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echo "Where <gid> is the numeric group id the tap devices will be owned by"
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echo "<num> is the number of tap devices to create (0 to remove all)"
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echo "<native-sysroot-basedir> is the path to the build system's native sysroot"
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exit 1
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}
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if [ $EUID -ne 0 ]; then
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echo "Error: This script must be run with root privileges"
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exit
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fi
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if [ $# -ne 3 ]; then
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echo "Error: Incorrect number of arguments"
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usage
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fi
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GID=$1
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COUNT=$2
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SYSROOT=$3
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TUNCTL=$SYSROOT/usr/bin/tunctl
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if [[ ! -x "$TUNCTL" || -d "$TUNCTL" ]]; then
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echo "Error: $TUNCTL is not an executable"
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usage
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fi
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SCRIPT_DIR=`dirname $0`
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RUNQEMU_IFUP="$SCRIPT_DIR/runqemu-ifup"
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if [ ! -x "$RUNQEMU_IFUP" ]; then
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echo "Error: Unable to find the runqemu-ifup script in $SCRIPT_DIR"
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exit 1
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fi
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IFCONFIG=`which ifconfig 2> /dev/null`
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if [ -z "$IFCONFIG" ]; then
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# Is it ever anywhere else?
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IFCONFIG=/sbin/ifconfig
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fi
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if [ ! -x "$IFCONFIG" ]; then
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echo "$IFCONFIG cannot be executed"
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exit 1
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fi
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# Ensure we start with a clean slate
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for tap in `$IFCONFIG | grep ^tap | awk '{ print \$1 }'`; do
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echo "Note: Destroying pre-existing tap interface $tap..."
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$TUNCTL -d $tap
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done
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echo "Creating $COUNT tap devices for GID $GID..."
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for ((index=0; index < $COUNT; index++)); do
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echo "Creating tap$index"
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ifup=`$RUNQEMU_IFUP $GID $SYSROOT 2>&1`
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if [ $? -ne 0 ]; then
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echo "Error running tunctl: $ifup"
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exit 1
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fi
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done
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# The runqemu script will check for this file, and if it exists,
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# will use the existing bank of tap devices without creating
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# additional ones via sudo.
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touch /etc/runqemu-nosudo
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