nixos/speechd: avoid by default on headless systems

[vcunat]

Incidentally this also fixes tests like nixosTests.installer.simple /cc PR #329658

Things done

• Built on platform(s): N/A
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• 24.11 Release Notes (or backporting 23.11 and 24.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

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[vcunat]

Feel free to suggest a better magic to guess the default, now or later.

[SuperSandro2000]

How about we move this into graphical-desktop.nix instead of doing guess work here?

Also just noticed the same 😂

[vcunat]

We could do that. I'm not sure which approach is better.

[SuperSandro2000]

I've added the generic graphic module and it's purpose is to collect all those things, that you only want to turn on on graphical systems, like this setting.

[vcunat]

OK, moved there and retested.

[vcunat]

Let's remove this blocker. Feel free to improve/change later.

[SuperSandro2000]

The merged version LGTM

[nixos-discourse]

This pull request has been mentioned on NixOS Discourse. There might be relevant details there:

https://discourse.nixos.org/t/how-to-remove-speech-dispatcher/49957/2

[solna86]

Is there a reason why services.speechd.enable defaults to true in graphical desktops (at least on unstable)?

NixOS is quite minimal by default, with very few processes running. Setting this option to true results in 4 or 5 new daemons getting spawn when one opens e.g. a web browser.

[K900]

Because if a person needs a screen reader to use their computer, they can't use their computer to install a screen reader.

[solna86]

OK, fair enough. But I would typically imagine they'd enable this during installation using the live image.

[K900]

There is currently no such option in the installer. If one was to be added, we could revisit this.

[SuperSandro2000]

I have collected the necessary options to disable speechd completely and get a smaller installation here https://github.com/NuschtOS/nixos-modules/blob/main/modules/slim.nix

[solna86]

I have collected the necessary options to disable speechd completely and get a smaller installation here https://github.com/NuschtOS/nixos-modules/blob/main/modules/slim.nix

That's actually a good idea. Right now, NixOS is still quite minimal. There's not that much apart from speechd on by default on a graphical desktop as specified in graphical-desktop.nix?

But, perhaps, if options for the graphical system grow too much, it might be worth considering to offer a slimmer alternative set of defaults, especially for those that only have a WM enabled but no desktop environment.