[Bug 1810043] Re: netplan apply fails if NIC alias exists

[Brian Murray]

** Also affects: netplan.io (Ubuntu Disco)
   Importance: Undecided
       Status: New

** Changed in: netplan.io (Ubuntu Disco)
       Status: New => Fix Committed

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https://bugs.launchpad.net/bugs/1810043

Title:
  netplan apply fails if NIC alias exists

Status in netplan:
  Fix Released
Status in netplan.io package in Ubuntu:
  Fix Released
Status in netplan.io source package in Bionic:
  Fix Released
Status in netplan.io source package in Disco:
  Fix Released

Bug description:
  [Impact]
  Running 'netplan apply' when an interface has an alias/label defined for it.

  [Test case]
  On a system which has a label set for an interface:
  ip addr add 192.168.0.1/24 dev eth0 label eth0:0

  1) run 'netplan apply'
  2) verify that the configuration for netplan can be applied without errors.

  [Regression potential]
  This has minimal risk, and only adds an extra check for a subprocess call that will otherwise fail, but is safely skipped. Avoid crashing in netplan when the files required to run 'net_setup_link' are not available, as the rest of the process will already run net_setup_link for the "master" interface which will have its own files in /sys/class/net.

  ---

  
  # netplan apply
  Traceback (most recent call last):
    File "/usr/sbin/netplan", line 23, in <module>
      netplan.main()
    File "/usr/share/netplan/netplan/cli/core.py", line 50, in main
      self.run_command()
    File "/usr/share/netplan/netplan/cli/utils.py", line 130, in run_command
      self.func()
    File "/usr/share/netplan/netplan/cli/commands/apply.py", line 43, in run
      self.run_command()
    File "/usr/share/netplan/netplan/cli/utils.py", line 130, in run_command
      self.func()
    File "/usr/share/netplan/netplan/cli/commands/apply.py", line 93, in command_apply
      stderr=subprocess.DEVNULL)
    File "/usr/lib/python3.6/subprocess.py", line 291, in check_call
      raise CalledProcessError(retcode, cmd)
  subprocess.CalledProcessError: Command '['udevadm', 'test-builtin', 'net_setup_link', '/sys/class/net/eth0:0']' returned non-zero exit status 4.

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