Xdg-desktop-portal-gtk.desktop collision

parafinalia · November 6, 2023, 12:44am

I’m a NixOS (very) newbie. I’ve enabled flakes and home manager following the ‘NixOs & Flakes Book’.
I’m trying to enable Sway system-wide rather than in home manager following the
wiki topic . (I originally tried the home-manager method first,
but the Sway session did not show up in the gdm greeter, and I gave up on that and thought I would
try the other method, backing out the changes for sway in home.nix.)

I get the following collision error:

[dlkrejsa@squirrel:/etc/nixos]$ sudo nixos-rebuild switch
building the system configuration...
trace: warning: optionsDocBook is deprecated since 23.11 and will be removed in 24.05
trace: warning: optionsDocBook is deprecated since 23.11 and will be removed in 24.05
trace: warning: optionsDocBook is deprecated since 23.11 and will be removed in 24.05
[2 copied (150.9 MiB), 24.5 MiB DL] downloading 'https://github.com/yusdacra/nix-cargo-integration/archive/ed27173cd1b223f598343ea3c15aacb1d140feac.tar.gz'
error: builder for '/nix/store/c4kqnv2fwnsgh6hl6jgc13732f729w98-xdg-portals.drv' failed with exit code 255;
       last 1 log lines:
       > error: collision between `/nix/store/ihzzkps46yh0npxqbic4i1p1zk96h1nd-xdg-desktop-portal-gtk-1.14.1/share/applications/xdg-desktop-portal-gtk.desktop' and `/nix/store/f74fx3mm8bwcphr5p6cqyslvlql96p3j-xdg-desktop-portal-gtk-1.14.1/share/applications/xdg-desktop-portal-gtk.desktop'
       For full logs, run 'nix log /nix/store/c4kqnv2fwnsgh6hl6jgc13732f729w98-xdg-portals.drv'.
error: 1 dependencies of derivation '/nix/store/6y4v0dyrzy6y4d4phn7v10p23qismyj6-etc-pam-environment.drv' failed to build
error: 1 dependencies of derivation '/nix/store/0iysns8m1cxlmz6750qhs9xal9bjxkar-set-environment.drv' failed to build
error: 1 dependencies of derivation '/nix/store/0yq9df3lkh5yhgsf4nnwk5n00bzsnw45-system-path.drv' failed to build
error: 1 dependencies of derivation '/nix/store/n5q92d41ig3253wdajp3c6xizgdhcpgh-nixos-system-squirrel-23.11.20231104.85f1ba3.drv' failed to build

Here are possibly relevant bits of my configuration.nix:

  services.dbus.enable = true;
  xdg.portal = {
    enable = true;
    wlr.enable = true;
    # gtk portal needed to make gtk apps happy
    extraPortals = [ pkgs.xdg-desktop-portal-gtk ];
  };

  programs.sway = {
    enable = true;
    wrapperFeatures.gtk = true;
  };

Note, my configuration.nix also contains the ‘dbus-sway-environment’ and ‘configure-gtk’ hacks
shown in the wiki Sway topic.

Any advice about what is going wrong and how to get past this would be appreciated.
Thanks!

jtojnar · November 6, 2023, 1:54am

Do you perhaps have Pantheon, Budgie, Cinnamon, GNOME or Deepin also enabled? Those already install xdg-desktop-portal-gtk overridden to not contain some portals provided by those respective desktop environments.

parafinalia · November 6, 2023, 2:01am

Hi,
Yes, I have GNOME already installed (from the graphical installer).
What should I do to be able to use both GNOME and Sway sessions?
Should I just try removing the xdg.portal.extraPortals definition from
my configuration.nix?
Thanks for your help!

parafinalia · November 6, 2023, 2:09am

I just tried commenting out the

    extraPortals = [ pkgs.xdg-desktop-portal-gtk ];

line from my configuration.nix. That allowed the nixos-rebuild switch command
to go through successfully. However, no ‘Sway’ session appeared in the gdm greeter.
But this is progress, anyhow…

parafinalia · November 6, 2023, 3:15am

Adding

services.xserver.displayManager.sessionPackages = [ pkgs.sway ];

to configuration.nix, running ‘sudo nixos-rebuild switch’ and rebooting, sway now appears as a choice in the gdm greeter.
Thanks very much for the hints!

jtojnar · November 6, 2023, 4:50am

That should be enabled out of the box by the sway module:

github.com

NixOS/nixpkgs/blob/4cf9f0f864a05407c78a85027c12b22e484411a6/nixos/modules/programs/wayland/sway.nix#L153


      
                      "sway/config.d/nixos.conf".source = pkgs.writeText "nixos.conf" ''
                        # Import the most important environment variables into the D-Bus and systemd
                        # user environments (e.g. required for screen sharing and Pinentry prompts):
                        exec dbus-update-activation-environment --systemd DISPLAY WAYLAND_DISPLAY SWAYSOCK XDG_CURRENT_DESKTOP
                      '';
                    } // optionalAttrs (cfg.package != null) {
                      "sway/config".source = mkOptionDefault "${cfg.package}/etc/sway/config";
                    };
                  };
                  # To make a Sway session available if a display manager like SDDM is enabled:
                  services.xserver.displayManager.sessionPackages = optionals (cfg.package != null) [ cfg.package ]; }
                (import ./wayland-session.nix { inherit lib pkgs; })
              ]);
          
          
  meta.maintainers = with lib.maintainers; [ primeos colemickens ];
          }

Defining it again explicitly with pkgs.sway might mean the wrapper features will not work.

parafinalia · November 9, 2023, 3:48pm

Sorry for the late reply. I removed the

services.xserver.displayManager.sessionPackages = [ pkgs.sway ];

line from configuration.nix, and sway still appears in the gdm greeter. The only problem I’m still running into is that programs like firefox or evince take a long time (20 to 30 seconds) to start. But that’s a topic for another thread. Thanks!