`netplan apply` leaves leftover directories under /tmp

[Simon Déziel]

Running 'netplan apply' leaves leftover directories under /tmp.

Steps to reproduce:

1) Create a container
$ lxc launch images:ubuntu/focal f-netplan

2) Run 'netplan apply'
$ lxc exec f-netplan netplan apply
$ lxc exec f-netplan netplan apply

3) Check for leftovers
$ lxc exec f-netplan -- ls -l /tmp | grep netplan

Step 3 should return nothing but it currently looks like that:

$ lxc exec f-netplan -- ls -l /tmp | grep netplan
drwx------ 2 root root 2 Jul 31 14:15 netplan_jisn27s4
drwx------ 2 root root 2 Jul 31 14:15 netplan_p3hnod6y

On desktop/graphical sessions, this causes some noise from gsd-housekeeping:
Jul 31 15:48:24 foo gsd-housekeepin[1606]: Failed to enumerate children of /tmp/netplan_n_2cznjs: Error opening directory '/tmp/netplan_n_2cznjs': Permission denied

This issue was observed on Bionic and Focal.

Additional information:

$ lxc exec f-netplan -- dpkg -l | grep netplan
ii libnetplan0:amd64 0.99-0ubuntu3~20.04.2 amd64 YAML network configuration abstraction runtime library
ii netplan.io 0.99-0ubuntu3~20.04.2 amd64 YAML network configuration abstraction for various backends
$ lxc exec f-netplan -- lsb_release -rd
Description: Ubuntu 20.04.1 LTS
Release: 20.04

[Lukas Märdian (slyon)]

This should be fixed as of v0.104 (https://github.com/canonical/netplan/pull/259)

Please re-open if this is still an issue.