def delete_net_dev(dev):
"""Delete a network device only if it exists."""
if device_exists(dev):
try:
processutils.execute('ip', 'link', 'delete', dev,
check_exit_code=[0, 2, 254],
run_as_root=True)
LOG.debug("Net device removed: '%s'", dev)
except processutils.ProcessExecutionError:
with excutils.save_and_reraise_exception():
LOG.error(_LE("Failed removing net device: '%s'"), dev)
def create_tap_dev(dev, mac_address=None):
if not device_exists(dev):
try:
# First, try with 'ip'
processutils.execute('ip', 'tuntap', 'add', dev, 'mode',
'tap', check_exit_code=[0, 2, 254],
run_as_root=True)
except processutils.ProcessExecutionError:
# Second option: tunctl
processutils.execute('tunctl', '-b', '-t', dev,
run_as_root=True)
if mac_address:
processutils.execute('ip', 'link', 'set', dev, 'address', mac_address,
check_exit_code=[0, 2, 254],
run_as_root=True)
processutils.execute('ip', 'link', 'set', dev, 'up',
check_exit_code=[0, 2, 254],
run_as_root=True)