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#!/usr/bin/env python3
# bin/setup_interface
# -----------------------------------------------------------------------
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# http://www.apache.org/licenses/LICENSE-2.0
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ------------------------------------------------------------------------
# Author: Todd Gaunt, toddgaunt@iol.unh.edu or toddgaunt@gmail.com
# License: Apache v2.0
# Description: Script for setting up initial network interfaces
# it activates dhcp on all interfaces in order to at least get the admin
# network up
import os
import subprocess
import netifaces
def generate_interfaces_file(ifaces, os_network_file):
"""Takes a list of interfaces and a location to save a network
interfaces file"""
interfaces = ""
for i in ifaces:
n = "auto " + str(i) + "\n" \
+ "iface " + str(i) + " inet dhcp\n"
interfaces += n
return interfaces
def set_interfaces_up(ifaces):
"""Uses ifup command to put network devices up according to
interfaces file"""
for iface in ifaces:
ifupcmd = [ \
"ifup",
iface]
ifdowncmd = [ \
"ifdown",
iface]
with open(os.devnull, 'w') as fn:
status = subprocess.Popen(ifdowncmd, stdout=fn, stderr=fn).wait()
status = subprocess.Popen(ifupcmd, stdout=fn, stderr=fn).wait()
print(str(iface) + " " + str(status))
def main():
os_network_file="/etc/network/interfaces"
ifaces = netifaces.interfaces()
interfaces = generate_interfaces_file(ifaces, os_network_file)
with open(os_network_file, 'w') as fd:
fd.write(interfaces)
set_interfaces_up(ifaces)
if __name__ == "__main__":
main()
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