[Bug 2019877] [NEW] 'snap'ped firefox no-longer supports remote displays

[Richard Earnshaw]

Public bug reported:

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 22.04.2 LTS
Release:        22.04
Codename:       jammy

Since the downgrade to using snap I've had endless problems with
firefox.  The most recent is that it no-longer supports running on a
remote display.

$ ssh -XYK <remote-machine>
# on remote...

# Launch a local firefox, displaying on remote machine
$ firefox --no-remote
/bin/bash: /home/rearnsha/.shrc: Permission denied
X11 connection rejected because of wrong authentication.
Error: cannot open display: localhost:10.0
X11 connection rejected because of wrong authentication.
X11 connection rejected because of wrong authentication.
$

What should happen is that firefox starts

There are two issues here.  Both, I suspect, caused by snap.

The first is that error message from bash, I have BASH_ENV set but the
frobbing of the directory structure probably means the .shrc file has
not been correctly copied (copying that file is not enough, it in turn
sources other files from my home filesystem).  I'm not able to work out
exactly what's going wrong here, though because strace doesn't work
properly on 'snap'ped binaries either.

The second issue is that the .Xauthority information has not been copied
during the frobbing of the directory structure so the remote
authentication tokens are missing.

I can hack around the issue by copying ~/.Xauthority to
~/snap/firefox/common/ but I shouldn't need to be doing this stuff.

Frankly, this all sucks and it is seriously making me consider whether I
want to continue using Ubuntu.

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2019877

Title:
  'snap'ped firefox no-longer supports remote displays

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