wsl-integration.sh shows error when .cache/ can't be created

[Balint Reczey]

[ Impact ]

 * When $HOME/.cache can't be created an error is shown:
   mkdir: cannot create directory ‘//.cache’: Permission denied

[Test Case]
 * TODO

[Regression Potential]
 * TODO
[Other Info]

Originally reported to:
https://github.com/wslutilities/wslu/issues/101

In addition to suppressing the error message it would probably be also useful to disable the detection by default for system users.

[Dawid (nebuso)]

Same problem on 3 different PCs but MySQL won't start.
WSL1, all Windows and Ubuntu updates,
also try to:
- reinstall MySQL,
- change repository to https://repo.mysql.com//mysql-apt-config_0.8.14-1_all.deb
- reinstall Ubuntu 18.04

Always stop at:
mkdir: cannot create directory ‘//.cache’: Permission denied
-su: 19: /etc/profile.d/wsl-integration.sh: cannot create //.cache/wslu/integration: Directory nonexistent

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[YouJin Jung (jung-youjin)]

I'm having the same issue as @Dawid

[Ryan (technosis)]

+1 for me. MySQL starts with that error and does run but is not stable.

[count alucard (countalucard2022)]

+1 setting up my things on WSL and getting the same error when starting the mysql service.

[Ryan (technosis)]

^^ ignore this, my 4 year old found my keyboard.

[Launchpad Janitor (janitor)]

This bug was fixed in the package wslu - 2.3.6-0ubuntu1

---------------
wslu (2.3.6-0ubuntu1) focal; urgency=medium

  [ Patrick Wu ]
  * Upstream update to 2.3.6 to address critical issues (LP: #1871986)
    - wslupath manpage update
    - fixes that imported distro cannot be properly handled by baseexec_gen
    - fix an issue in handling dirty output in regenerate baseexec
    - fix an issue in generating ~/.config/baseexec
    - wslusc: fix an issue that will cause generated shortcut cannot be opened
      for some users
  * Update patches
  * debian/wsl-integration.sh: removal links in profile.d as requested by MSFT.
  * debian/wsl-integration.sh: Fix issue that space in username breaks
    wsl-integration.sh. (LP: #1869878)
  * debian/wsl-integration.sh: Use /tmp folder for system users who do not have
    $HOME. (LP: #1859509)

  [ Balint Reczey ]
  * debian/wsl-integration.sh: Suppress errors when saving $HOME/.cache.
    (LP: #1859509)
  * debian/wsl-integration.sh: debian/wsl-integration.sh unset the right
    variable at the end of script. (LP: #1857426)

 -- Patrick Wu <email address hidden> Thu, 09 Apr 2020 20:27:13 +0800

[Ryan (technosis)]

Will this fix make it to ubuntu2~18.04.3 as well?

[Patrick Wu (callmepk)]

SRU process will take some time, but yes, it will make to both bionic or xenial

[Rene Prillop (prr24)]

What is the expected latency for it to reach Bionic? 1.5 months has passed since...
I think there is no real benefit if it gets released in 2023 :)

[Patrick Wu (callmepk)]

Rene Prillop,

I have submitted the SRU to backport the fix back to bionic and xenial. It is usually expected to be completed in 2-3 weeks

[Nathan Griffin (astrotheque)]

Patrick Wu,

I am experiencing the same issue with the installation of WSL 2 and bionic on Win10. I recently updated everything. This could be unrelated, but how do you know when it is fixed?

https://www.screencast.com/t/hqSkdKpypO9o

[Rene Prillop (prr24)]

It is hard to feel any enthusiasm from Ubuntu to backport the fix.
Considering how many issues I have run into trying to use Ubuntu WSL image, I am not sure Ubuntu has any real interest in WSL. Just like Apple is not really into that boot camp thingy.

[Patrick Wu (callmepk)]

Hi Rene,

We are sorry for the hassle caused, but the fix is currently being in the final stage of backporting and will be complete backporting this week, and you can track them at https://bugs.launchpad.net/ubuntu/+source/wslu/+bug/1877016, https://bugs.launchpad.net/ubuntu/+source/wslu/+bug/1883920 and https://bugs.launchpad.net/ubuntu/+source/wslu/+bug/1883924. You can also get the fix from here now: https://launchpad.net/~callmepk/+archive/ubuntu/wslu-dev