[Bug 1726068] Proposed package upload rejected

[Robie Basak]

An upload of packagekit to disco-proposed has been rejected from the
upload queue for the following reason: "Incomplete SRU information and
no response to requests to fix it".

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https://bugs.launchpad.net/bugs/1726068

Title:
  debconf socket closes if aptdaemon/PK client exits

Status in apper package in Ubuntu:
  New
Status in aptdaemon package in Ubuntu:
  Fix Released
Status in packagekit package in Ubuntu:
  Fix Released
Status in software-properties package in Ubuntu:
  Invalid
Status in apper source package in Bionic:
  New
Status in aptdaemon source package in Bionic:
  New
Status in packagekit source package in Bionic:
  New
Status in apper source package in Disco:
  New
Status in aptdaemon source package in Disco:
  New
Status in packagekit source package in Disco:
  Incomplete

Bug description:
  [Impact]
  Closing an application using PackageKit or aptdaemon to install packages kills the debconf endpoint (because it's a subprocess that's cleaned up), causing debconf to use defaults which might lead to wrong results, or even cause installations to fail.

  [Solution]
  The solution is to move the end point into a socket-activated systemd unit, so that it is independent of the graphical frontend that started the transaction. The other advantage is that this offers us restart if the end point crashes.

  [Test case]
  1. Install opera deb using packagekit, ensure service is activated
  2. Install opera deb using aptdaemon, ensure service is activated

  Alternatively, you might use another deb that has debconf prompts.

  [Regression potential]
  Systems that do not yet use systemd will fall back to the old method, so should not regress.

  Otherwise, if there are bugs, they'd affect the ability to show
  debconf prompts, and behavior would revert to using the defaults.

  There might be some uncertainty if you restart your desktop while the
  helper is running and it does not pick up the new X/Wayland display
  until it restarts (it should fail to connect and restart). Given that
  the helper times out, this should not be an issue in practice, as
  you'd have to logout, login, and start a new install within 60
  seconds.

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