[Bug 1995598] [NEW] netplan apply will crash if openvswitch is not running

[Danilo Egea Gondolfo]

Public bug reported:

The problem was reported on Ubuntu 22.04.

netplan apply will call ovs-vsctl and will crash if openvswitch is not running.
 

# sudo netplan apply
ovs-vsctl: unix:/var/run/openvswitch/db.sock: database connection failed (No such file or directory)
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 247, in run_command
    self.func()
  File "/usr/share/netplan/netplan/cli/commands/apply.py", line 61, in run
    self.run_command()
  File "/usr/share/netplan/netplan/cli/utils.py", line 247, in run_command
    self.func()
  File "/usr/share/netplan/netplan/cli/commands/apply.py", line 167, in command_apply
    NetplanApply.process_ovs_cleanup(config_manager, old_files_ovs, restart_ovs, exit_on_error)
  File "/usr/share/netplan/netplan/cli/commands/apply.py", line 394, in process_ovs_cleanup
    apply_ovs_cleanup(config_manager, ovs_old, ovs_current)
  File "/usr/share/netplan/netplan/cli/ovs.py", line 138, in apply_ovs_cleanup
    out = subprocess.check_output([OPENVSWITCH_OVS_VSCTL, '--columns=name,external-ids',
  File "/usr/lib/python3.10/subprocess.py", line 420, in check_output
    return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
  File "/usr/lib/python3.10/subprocess.py", line 524, in run
    raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '['/usr/bin/ovs-vsctl', '--columns=name,external-ids', '-f', 'csv', '-d', 'bare', '--no-headings', 'list', 'Port']' returned non-zero exit status 1.


Netplan should throw a warning message and ignore ovs configuration is
cases like this.

** Affects: netplan.io (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1995598

Title:
  netplan apply will crash if openvswitch is not running

Status in netplan.io package in Ubuntu:
  New

Bug description:
  The problem was reported on Ubuntu 22.04.

  netplan apply will call ovs-vsctl and will crash if openvswitch is not running.
   

  # sudo netplan apply
  ovs-vsctl: unix:/var/run/openvswitch/db.sock: database connection failed (No such file or directory)
  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 247, in run_command
      self.func()
    File "/usr/share/netplan/netplan/cli/commands/apply.py", line 61, in run
      self.run_command()
    File "/usr/share/netplan/netplan/cli/utils.py", line 247, in run_command
      self.func()
    File "/usr/share/netplan/netplan/cli/commands/apply.py", line 167, in command_apply
      NetplanApply.process_ovs_cleanup(config_manager, old_files_ovs, restart_ovs, exit_on_error)
    File "/usr/share/netplan/netplan/cli/commands/apply.py", line 394, in process_ovs_cleanup
      apply_ovs_cleanup(config_manager, ovs_old, ovs_current)
    File "/usr/share/netplan/netplan/cli/ovs.py", line 138, in apply_ovs_cleanup
      out = subprocess.check_output([OPENVSWITCH_OVS_VSCTL, '--columns=name,external-ids',
    File "/usr/lib/python3.10/subprocess.py", line 420, in check_output
      return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
    File "/usr/lib/python3.10/subprocess.py", line 524, in run
      raise CalledProcessError(retcode, process.args,
  subprocess.CalledProcessError: Command '['/usr/bin/ovs-vsctl', '--columns=name,external-ids', '-f', 'csv', '-d', 'bare', '--no-headings', 'list', 'Port']' returned non-zero exit status 1.


  Netplan should throw a warning message and ignore ovs configuration is
  cases like this.

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