[Bug 1768823] Re: netplan ip leases <interface>

[Eric Desrochers]

** Also affects: netplan
   Importance: Undecided
       Status: New

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Title:
  netplan ip leases <interface>

Status in netplan:
  New
Status in netplan.io package in Ubuntu:
  New

Bug description:
  "netplan ip leases <interface>" command is failing with a Traceback[1]
  when specifying an interface non-existing on the system. non-dhcp
  configured or non configured with netplan.

  Using:
  ii  netplan.io  0.36.1  amd64 YAML network configuration abstraction for various backends

  Of course, the cmdline works as expected when the interface exist[2]

  IMHO, if someone pick a non-existing interface, netplan should just
  output a generic error saying that the interface cannot be found or
  else, instead of printing a stack traceback.

  [1] - Traceback
  $ netplan ip leases eth0
  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/ip.py", line 56, 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/ip.py", line 75, 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/ip.py", line 142, in command_ip_leases
      out = subprocess.check_output(argv, universal_newlines=True)
    File "/usr/lib/python3.6/subprocess.py", line 336, in check_output
      **kwargs).stdout
    File "/usr/lib/python3.6/subprocess.py", line 418, in run
      output=stdout, stderr=stderr)
  subprocess.CalledProcessError: Command '['/lib/netplan/generate', '--mapping', 'eth1']' returned non-zero exit status 1.

  [2] - $ netplan ip leases eth0
  # This is private data. Do not parse.
  ADDRESS=10.104.180.111
  NETMASK=255.255.255.0
  ROUTER=10.104.180.1
  SERVER_ADDRESS=10.104.180.1
  NEXT_SERVER=10.104.180.1
  BROADCAST=10.104.180.255
  T1=1673
  T2=3023
  LIFETIME=3600
  DNS=10.104.180.1
  DOMAINNAME=lxd
  HOSTNAME=nplan
  CLIENTID=ffefc0b3c900020000ab118611d41fefa41121

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