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nixos/gdm: Conflict plymouth-quit, but more carefully #100569

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merged 1 commit into from Feb 21, 2021

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@andersk
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@andersk andersk commented Oct 15, 2020

Motivation for this change

To avoid extra flickering on boot, we want GDM to tell Plymouth to quit after GDM takes control of the display. That configuration was reverted in #71065 because it caused nixos-rebuild switch to bring down the graphical session. The reason was that if multi-user.target wants plymouth-quit.service which conflicts display-manager.service, then when nixos-rebuild switch starts multi-user.target, display-manager.service is stopped so plymouth-quit.service can be started. We avoid this problem by removing WantedBy: multi-user.target from plymouth-quit.service.

Things done
  • Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
  • Built on platform(s)
    • NixOS
    • macOS
    • other Linux distributions
  • Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
  • Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
  • Tested execution of all binary files (usually in ./result/bin/)
  • Determined the impact on package closure size (by running nix path-info -S before and after)
  • Ensured that relevant documentation is up to date
  • Fits CONTRIBUTING.md.
To avoid extra flickering on boot, we want GDM to tell Plymouth to
quit after GDM takes control of the display.  That configuration was
reverted in NixOS#71065 because it caused ‘nixos-rebuild switch’ to bring
down the graphical session.  The reason was that if multi-user.target
wants plymouth-quit.service which conflicts display-manager.service,
then when ‘nixos-rebuild switch’ starts multi-user.target,
display-manager.service is stopped so plymouth-quit.service can be
started.  We avoid this problem by removing WantedBy:
multi-user.target from plymouth-quit.service.

Signed-off-by: Anders Kaseorg <andersk@mit.edu>
@worldofpeace
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@worldofpeace worldofpeace commented Feb 21, 2021

Hi, very sorry that this has gone under the radar. I will try this out since I've been experimenting with things again lately.

@worldofpeace
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@worldofpeace worldofpeace commented Feb 21, 2021

I can't remember fully how to reproduce the issue before, but rebulid switch did not bring down my session.

@andersk
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@andersk andersk commented Feb 21, 2021

I can still reproduce the issue before by adding the first hunk without the second hunk (i.e., reverting ed20a54) and running nixos-rebuild switch. The second hunk avoids this problem.

@worldofpeace
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@worldofpeace worldofpeace commented Feb 21, 2021

I can still reproduce the issue before by adding the first hunk without the second hunk (i.e., reverting ed20a54) and running nixos-rebuild switch. The second hunk avoids this problem.

It all sounds good to me 👍

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@worldofpeace worldofpeace left a comment

LGTM, let's hope these aren't my famous last words again 😁

@worldofpeace worldofpeace merged commit 4287f5a into NixOS:master Feb 21, 2021
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