[Bug 1855898] Update Released

[Łukasz Zemczak]

The verification of the Stable Release Update for wslu has completed
successfully and the package is now being released to -updates.
Subsequently, the Ubuntu Stable Release Updates Team is being
unsubscribed and will not receive messages about this bug report.  In
the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
regression-update so we can easily find any regressions.

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https://bugs.launchpad.net/bugs/1855898

Title:
  Cache results of detecting X and PulseAudio when starting environment

Status in wslu package in Ubuntu:
  Fix Released
Status in wslu source package in Xenial:
  Fix Committed
Status in wslu source package in Bionic:
  Fix Committed
Status in wslu source package in Disco:
  Fix Released
Status in wslu source package in Eoan:
  Fix Released

Bug description:
  [Impact]

   * Detecting X and PulseAudio takes some time when starting every shell even when it is unlikely that those servers go away between opening new shells.
   * The fix is reusing cached info when starting new shells.

  [ Test Case ]

   * Start X server and PulseAudio server on Windows, the host WSL system
   * run:

  rm -f $HOME/.cache/wslu/integration
  unset DISPLAY
  unset PULSE_SERVER
  time . /etc/profile.d/wsl-integration.sh
  echo $DISPLAY $PULSE_SERVER
  cat $HOME/.cache/wslu/integration
  time . /etc/profile.d/wsl-integration.sh

   * Ran all of that again with X server and PulseAudio server turned
  off

  [Regression Potential]

   * Wrong implementation of  caching logic may break auto detection or
  cache a wrong result. The test case ensures that auto detection is
  still working and also checks the cache content.

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