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