Remove customBuilds, nixos-generate has --flake

[Pacman99]

nixos-generators now has --flake support, so theres no reason for us to export all the builds here. Lets just offload this responsibility to nixos-generators.

Somewhat blocked by nix-community/nixos-generators#138, so that we don't need to make our hosts overridable.

[montchr]

Nice. I had to work around customBuilds in the darwin-support branch since it's not usable on darwin hosts. I was going to propose via that branch that we make the module optional or loaded only for Linux hosts, but offloading it to nixos-generators is even better.

[montchr]

🏗️

[danielphan2003]

I used to use bud to generate ISOs for my configs, but now that nix-community/nixos-generators#138 just closed, how do I use nixos-generate with this?

I'm using this PR and the latest commit of nixos-generators. I used nixos-generate -f iso --system x86_64-linux --flake .\#rog-bootstrap but it throws attribute 'extendModules' missing'. Does this have anything to do with the old bud behavior (see https://github.com/divnix/bud/blob/a789d710851441ba7e7cd59be378623b1fe05688/scripts/hosts-build.bash)?

[Pacman99]

The extendModules error is likely from your host being evaluated with an older version of the module system, so you would have to update to 21.11 or after. If you are already updated, then I'm not really sure whats wrong.
This is the the commit that added extendModules NixOS/nixpkgs#143207, so can you check to see if you have that commit. You can also investigate in nix repl, to see if extendModules is in your config.
I'll wait until we can resolve your issue before merging this, I want to make sure nixos-generate is actually a viable solution.

I was able to build an iso with my host, and it seems like it includes my entire hosts closure in the iso. I think the install-iso format feasibly replaces our bootstrapIso with everything but the networking part. If that was to be upstreamed to nixos-generators, then we could remove bootstrapIso.
I did have to change two definitions:
boot.grub.loader.enable = mkDefault true; networking.networkmanager.enable = !config.networking.wireless;

[danielphan2003]

I can only find Flake.outputs.nixosConfigurations.<host>._module.args.extendModules, but not top-level extendModules. I forked https://github.com/danielphan2003/nixos-generators/blob/module-args-extendModules/nixos-generate.nix to use _module.args.extendModules instead, and it seems to work. I think this is a hack, so any idea why this happens?

[danielphan2003]

Also remove https://github.com/Pacman99/digga/blob/2f6bcd38f148a8ffc367400de532f070a0a74294/flake.nix#L51 since we're not depending on nixos-generators for customBuilds.

[blaggacao]

bors try

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[blaggacao]

bors try

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[montchr]

#443

[blaggacao]

bors try

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try

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[blaggacao]

bors try

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try

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[Pacman99]

This should be ready to merge with NixOS/nixpkgs#166148 in which should fix @danielphan2003's error

Users will need to update their own nixpkgs input for the feature.