[Bug 1853343] Re: [SRU] Please detect sound and X server in WSL2, too

[Balint Reczey]

Verified using WSL1 on Xenial, Bionic, Disco and Eoan.
Still needs verification using WSL2.

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https://bugs.launchpad.net/bugs/1853343

Title:
  [SRU] Please detect sound and X server in WSL2, too

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 Committed
Status in wslu source package in Eoan:
  Fix Committed

Bug description:
  [Impact]

   * Ubuntu in WSL2 does not detect the PulseAudio or X11 server running on Windows. Detecting them is easy and doing so improves the setup experience.
   * The additional detection logic slowed down the login further, thus a minor speed optimization is also part of the change.

  [Test Case] (Run once in WSL1 and once in WSL2)

   * Install and start PulseAudio for Windows ( https://wiki.ubuntu.com/WSL#Enabling_Sound )
   * Install and start an X11 server for Windows ( https://wiki.ubuntu.com/WSL#Running_Graphical_Applications )
   * Start the Ubuntu WSL terminal
   * Make sure pulseaudio is not installed:
     $ pulseaudio

     Command 'pulseaudio' not found, but can be installed with:

     apt install pulseaudio

   * Install mpg321 and x11-utils inside Ubuntu and run xeyes and play an MP3 file
     $ sudo apt install x11-utils mpg321
     $ xeyes
     $ mpg321 foo.mp3

   * Install pulseaudio
     $ sudo apt install pulseaudio
   * Close all Ubuntu WSL sessions
   * Start the Ubuntu WSL terminal again
   * Play an MP3 again, it should still work

  [Regression Potential]

   * Since the detection takes place in setting the profile mistakes in
  the implementation may trigger errors show to the users on login.
  Detecting X and PulseAudio may also break in WSL1 with  the changed
  detection logic, but tests include verifying that this still works.

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