ip_delete_tap

#!/bin/bash
# $Id: ip_delete_tap 1373 2023-02-16 11:21:26Z mueller $
# SPDX-License-Identifier: GPL-3.0-or-later
# Copyright 2023- by Walter F.J. Mueller <W.F.J.Mueller@gsi.de>
#
#  Revision History:
# Date         Rev Version  Comment
# 2023-02-16  1373   1.0    Initial version
#

# handle options
optdry=""
while (( $# > 0 )) ; do
  case $1 in
    -dry|--dry)     optdry=$1      ; shift 1 ;;
    -*)             echo "ip_delete_br-E: invalid option '$1'"; exit 1 ;;
    *)     break;;
  esac
done

prefdry=""
if [[ -n "$optdry" ]] ; then
  prefdry="echo"
fi

tap=${1:-tap0}

ip link show ${tap} >/dev/null 2>&1
if [ $? != 0 ]
then
  echo "ip_delete_tap-I: tap ${tap} doesn't exist"
  exit 0
fi

# sanitize PATH, use what sudo has
export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin

which_ip=$(which ip)
which_brctl=$(which brctl)

if [[ -z "$which_ip" ]]
then 
  echo "ip_delete_br-E: ip command not in PATH"
  exit 1
fi

# print info that sudo password prompt is expected
if [[ $(id -u) -ne 0 ]] ; then echo "ip_delete_br-I: uses sudo" ; fi

$prefdry sudo  ip tuntap delete ${tap} mode tap

#
if [[ -n "$which_brctl" ]]
then 
  $prefdry $which_brctl show ${br}
fi