[Bug 1943120] Re: interface not removed

[Lukas Märdian]

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

** Changed in: netplan
       Status: Triaged => Fix Committed

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

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

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

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https://bugs.launchpad.net/bugs/1943120

Title:
  interface not  removed

Status in netplan:
  Fix Committed
Status in systemd:
  New
Status in netplan.io package in Ubuntu:
  New
Status in netplan.io source package in Focal:
  New
Status in netplan.io source package in Hirsute:
  New
Status in netplan.io source package in Impish:
  New

Bug description:
  While working on the UC20 integration for netplan I ran into the
  follow, I may misunderstand how netplan dbus works so feel free to
  close as "Invalid" if it's my misconception (and apologizes in this
  case). Any help appreciated.

  I ran into this while writing integration tests for snapd netplan
  integration, I create (via the dbus api) a bridge br54, set it to dhcp
  and then unset the interface again. After unset the br54 interface is
  still available but AIUI it should be deleted. Attached is a
  reproducer that uses the same dbus api as snapd is using. I ran it on
  a fresh 21.04 VM and got the same issue so it's probably not UC20
  specific.

  If I do similar things using "netplan set/netplan try/netplan appy"
  directly it seems that the interface gets deleted as expected. I did
  not write a script for this though, just manually tried it so I might
  be wrong here.

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