Mir

Wayland clients do not work on miral-desktop

Bug #1716353 reported by Alan Griffiths on 2017-09-11
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Mir
Fix Released
Critical
Alan Griffiths

Bug Description

Install mir-examples from the staging PPA (or build Mir from trunk)

$ sudo add-apt-repository ppa:mir-team/staging
$ sudo apt update
$ sudo apt install mir-examples

Then run miral-desktop:

$ miral-desktop

In the terminal run:

$ QT_QPA_PLATFORM=wayland kate

Expect: Kate starts, using wayland
Actual: Kate crashes with "Failed to create display (No such file or directory)"

Related branches

Alan Griffiths (alan-griffiths) wrote :

The corresponding scenario works with mir-app, so I suspect that running the shell as root and connecting as the user is a usecase that doesn't (yet) work.

Alan Griffiths (alan-griffiths) wrote :

Yes, the client is looking for $XDG_RUNTIME_DIR/wayland-0 - which (obviously) the server didn't create. There ought to be a way to configure this right.

Alan Griffiths (alan-griffiths) wrote :

OK, so what is happening is that wl_display_add_socket_auto(display) relies on $XDG_RUNTIME_DIR being set. That's a sensible default, but, as root, this isn't the case so no socket is created.

The client is looking in the right place, we just need a way for the script to specify the wayland socket to the server, and that needs to call wl_display_add_socket(<socket>, display) instead. (Much as we do for the legacy Mir socket.)

Changed in mir:
assignee: nobody → Alan Griffiths (alan-griffiths)
Alan Griffiths (alan-griffiths) wrote :

Nope, wl_display_add_socket() also insists on having XDG_RUNTIME_DIR, we'll have to go with the flow.

Changed in mir:
status: Triaged → Fix Committed
Changed in mir:
status: Fix Committed → Fix Released
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