ifconfig alternative

[benjaoming]

From @benjaoming on May 2, 2017 10:26

Background: https://linuxconfig.org/how-to-install-missing-ifconfig-command-on-debian-linux

"ifconfig" was deprecated and is now removed in ubuntu 17.04. It can be installed with package net-tools, but we should perhaps just find workarounds.

Currently, subprocess throws and exception:

Traceback (most recent call last):
  File "/usr/bin/kalite", line 121, in <module>
    cli.main()
  File "/usr/lib/python2.7/dist-packages/kalite/cli.py", line 843, in main
    port=arguments["--port"]
  File "/usr/lib/python2.7/dist-packages/kalite/cli.py", line 495, in start
    addresses = get_ip_addresses(include_loopback=False)
  File "/usr/lib/python2.7/dist-packages/kalite/packages/bundled/fle_utils/internet/functions.py", line 108, in get_ip_addresses
    ips = [iface.get("inet") for iface in ifcfg.interfaces().values()]
  File "/usr/lib/python2.7/dist-packages/kalite/packages/dist/ifcfg/__init__.py", line 60, in interfaces
    parser = get_parser()
  File "/usr/lib/python2.7/dist-packages/kalite/packages/dist/ifcfg/__init__.py", line 44, in get_parser
    parser = LinuxParser(ifconfig=ifconfig)
  File "/usr/lib/python2.7/dist-packages/kalite/packages/dist/ifcfg/parser.py", line 159, in __init__
    super(LinuxParser, self).__init__(*args, **kw)
  File "/usr/lib/python2.7/dist-packages/kalite/packages/dist/ifcfg/parser.py", line 141, in __init__
    super(UnixParser, self).__init__(*args, **kw)
  File "/usr/lib/python2.7/dist-packages/kalite/packages/dist/ifcfg/parser.py", line 36, in __init__
    self.parse(self.ifconfig_data)
  File "/usr/lib/python2.7/dist-packages/kalite/packages/dist/ifcfg/parser.py", line 54, in parse
    ifconfig, err, retcode = exec_cmd(self._meta.ifconfig_cmd_args)
  File "/usr/lib/python2.7/dist-packages/kalite/packages/dist/ifcfg/tools.py", line 20, in exec_cmd
    proc = Popen(cmd_args, stdout=PIPE, stderr=PIPE)
  File "/usr/lib/python2.7/subprocess.py", line 390, in __init__
    errread, errwrite)
  File "/usr/lib/python2.7/subprocess.py", line 1024, in _execute_child
    raise child_exception
OSError: [Errno 2] No such file or directory

Copied from original issue: learningequality/python-ifcfg#3

[benjaoming]

Fixed in da0f245

[benjaoming]

Released as 0.10

[benjaoming]

This didn't quite fix it, because __init__ calls parse - I wasn't reading the code right. So apparently the ifconfig_cmd gets set at load time, and then at initialization of the parser class, it's already calling parse which is kind of hard to deal with.

Needs a greater refactor :/