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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.
- #
- # SPDX-License-Identifier: GPL-2.0-only
- #
- uid=`id -u`
- gid=`id -g`
- if [ -n "$SUDO_UID" ]; then
- uid=$SUDO_UID
- fi
- if [ -n "$SUDO_GID" ]; then
- gid=$SUDO_GID
- fi
- usage() {
- echo "Usage: sudo $0 <uid> <gid> <num> <staging_bindir_native>"
- echo "Where <uid> is the numeric user id the tap devices will be owned by"
- echo "Where <gid> is the numeric group id the tap devices will be owned by"
- echo "<num> is the number of tap devices to create (0 to remove all)"
- echo "<native-sysroot-basedir> is the path to the build system's native sysroot"
- echo "For example:"
- echo "$ bitbake qemu-helper-native"
- echo "$ sudo $0 $uid $gid 4 tmp/sysroots-components/x86_64/qemu-helper-native/usr/bin"
- echo ""
- exit 1
- }
- if [ $# -ne 4 ]; then
- echo "Error: Incorrect number of arguments"
- usage
- fi
- TUID=$1
- GID=$2
- COUNT=$3
- STAGING_BINDIR_NATIVE=$4
- TUNCTL=$STAGING_BINDIR_NATIVE/tunctl
- if [[ ! -x "$TUNCTL" || -d "$TUNCTL" ]]; then
- echo "Error: $TUNCTL is not an executable"
- usage
- fi
- if [ $EUID -ne 0 ]; then
- echo "Error: This script must be run with root privileges"
- exit
- 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 $SCRIPT_DIR"
- exit 1
- fi
- IFCONFIG=`which ip 2> /dev/null`
- if [ -z "$IFCONFIG" ]; then
- # Is it ever anywhere else?
- IFCONFIG=/sbin/ip
- fi
- if [ ! -x "$IFCONFIG" ]; then
- echo "$IFCONFIG cannot be executed"
- exit 1
- fi
- if [ $COUNT -ge 0 ]; then
- # Ensure we start with a clean slate
- for tap in `$IFCONFIG link | grep tap | awk '{ print \$2 }' | sed s/://`; do
- echo "Note: Destroying pre-existing tap interface $tap..."
- $TUNCTL -d $tap
- done
- rm -f /etc/runqemu-nosudo
- else
- echo "Error: Incorrect count: $COUNT"
- exit 1
- fi
- if [ $COUNT -gt 0 ]; then
- echo "Creating $COUNT tap devices for UID: $TUID GID: $GID..."
- for ((index=0; index < $COUNT; index++)); do
- echo "Creating tap$index"
- ifup=`$RUNQEMU_IFUP $TUID $GID $STAGING_BINDIR_NATIVE 2>&1`
- if [ $? -ne 0 ]; then
- echo "Error running tunctl: $ifup"
- exit 1
- fi
- done
- echo "Note: For systems running NetworkManager, it's recommended"
- echo "Note: that the tap devices be set as unmanaged in the"
- echo "Note: NetworkManager.conf file. Add the following lines to"
- echo "Note: /etc/NetworkManager/NetworkManager.conf"
- echo "[keyfile]"
- echo "unmanaged-devices=interface-name:tap*"
- # 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
- fi
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