#!/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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# SPDX-License-Identifier: GPL-2.0-only
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#
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uid=`id -u`
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gid=`id -g`
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if [ -n "$SUDO_UID" ]; then
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uid=$SUDO_UID
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fi
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if [ -n "$SUDO_GID" ]; then
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gid=$SUDO_GID
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fi
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usage() {
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echo "Usage: sudo $0 <uid> <gid> <num> <staging_bindir_native>"
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echo "Where <uid> is the numeric user id the tap devices will be owned by"
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echo "Where <gid> is the numeric group id the tap devices will be owned by"
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echo "<num> is the number of tap devices to create (0 to remove all)"
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echo "<native-sysroot-basedir> is the path to the build system's native sysroot"
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echo "For example:"
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echo "$ bitbake qemu-helper-native"
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echo "$ sudo $0 $uid $gid 4 tmp/sysroots-components/x86_64/qemu-helper-native/usr/bin"
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echo ""
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exit 1
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}
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if [ $# -ne 4 ]; 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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TUID=$1
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GID=$2
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COUNT=$3
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STAGING_BINDIR_NATIVE=$4
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TUNCTL=$STAGING_BINDIR_NATIVE/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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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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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 $SCRIPT_DIR"
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exit 1
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fi
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IFCONFIG=`which ip 2> /dev/null`
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if [ -z "$IFCONFIG" ]; then
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# Is it ever anywhere else?
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IFCONFIG=/sbin/ip
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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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if [ $COUNT -ge 0 ]; then
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# Ensure we start with a clean slate
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for tap in `$IFCONFIG link | grep tap | awk '{ print \$2 }' | sed s/://`; 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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rm -f /etc/runqemu-nosudo
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else
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echo "Error: Incorrect count: $COUNT"
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exit 1
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fi
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if [ $COUNT -gt 0 ]; then
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echo "Creating $COUNT tap devices for UID: $TUID 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 $TUID $GID $STAGING_BINDIR_NATIVE 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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echo "Note: For systems running NetworkManager, it's recommended"
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echo "Note: that the tap devices be set as unmanaged in the"
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echo "Note: NetworkManager.conf file. Add the following lines to"
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echo "Note: /etc/NetworkManager/NetworkManager.conf"
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echo "[keyfile]"
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echo "unmanaged-devices=interface-name:tap*"
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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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fi
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