Help setting seperate host configs in flake.nix

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1 
      nixosConfigurations = {
        ########################
        yuki = nixpkgs.lib.nixosSystem {
          inherit system;
          modules = [ ./hosts/yuki/configuration.nix ];
          specialArgs = {
            hostname = "yuki";
            inherit pkgs-unstable inputs;
          };
        };

       ############################
        kumokon = nixpkgs.lib.nixosSystem {
          inherit system;
          modules = [ ./hosts/kumokon/configuration.nix ];
          specialArgs = {
            hostname = "kumokon";
            inherit pkgs-unstable inputs;
          };
        };
         ###########################
        thinker = nixpkgs.lib.nixosSystem {
          inherit system;
          modules = [ ./hosts/thinker/configuration.nix ];
          specialArgs = {
            hostname = "thinker";
            inherit pkgs-unstable inputs;
          };
        };
        ############################
      };

home manager config

      homeConfigurations = {
        ##########################
        "safri@yuki" = home-manager.lib.homeManagerConfiguration {
          inherit pkgs;
          extraSpecialArgs = {inherit inputs;};

          modules = [ ./hosts/yuki/home.nix ];
          specialArgs = { hostname = "yuki"; };
        };
        #############################
        "safri@thinker" = home-manager.lib.homeManagerConfiguration {
          inherit pkgs;
          extraSpecialArgs = {inherit inputs;};

          modules = [ ./hosts/yuki/home.nix ];
          specialArgs = { hostname = "thinker"; };
        };
        ###########################
      };

The configuration builds when “yuki = nix…” is “nixos = nix…” even though I changed my hostname

in both cases,

sudo nixos-rebuild switch --flake ~/.nix#yuki

fails to build (and same with home manager)

safri@yuki:~/.nix/ > nh os switch ~/.nix#yuki
> Building NixOS configuration
warning: Git tree '/home/safri/.nix' is dirty
error: flake 'git+file:///home/safri/.nix' does not provide attribute 'packages.x86_64-linux.yuki.config.system.build.toplevel', 'legacyPackages.x86_64-linux.yuki.config.system.build.toplevel' or 'yuki.config.system.build.toplevel'
┏━ 1 Errors: 
┃ error: flake 'git+file:///home/safri/.nix' does not provide attribute 'packages.x86_64-linux.yuki.config.system.build.toplevel', 'legacyPackages.x86_64-linux.yuki.config.system.build.toplevel' or 'yuki.config.system.build.toplevel'
┣━━━                                                            
┗━ ∑ ⚠ Exited with 1 errors reported by nix at 13:33:12 after 0s
Error: 
   0: Command exited with status Exited(1)

Location:
   src/commands.rs:262

dotfiles

If anybody could help fix my flake to allow for host separated configuration that would be greatly appreciated.

2

Hm, I’ve never used nh, but it doesn’t look like it’s working correctly. The error you should be getting is something like:

building the system configuration...
warning: Git tree '/home/tlater/.local/src/dotfiles' is dirty
error: flake 'git+file:///home/tlater/.local/src/dotfiles' does not provide attribute 'packages.x86_64-linux.nixosConfigurations."aaaaa".config.system.build.toplevel', 'legacyPackages.x86_64-linux.nixosConfigurations."aaaaa".config.system.build.toplevel' or 'nixosConfigurations."aaaaa".config.system.build.toplevel'

The main difference being:

or 'yuki.config.system.build.toplevel'

vs

or 'nixosConfigurations."aaaaa".config.system.build.toplevel'

As such, I would guess nh just doesn’t implement this correctly. Try using nixos-rebuild.

3 
safri@yuki:~/ > sudo nixos-rebuild switch --flake ~/.nix#yuki
[sudo] password for safri: 
warning: Git tree '/home/safri/.nix' is dirty
error: flake 'git+file:///home/safri/.nix' does not provide attribute 'packages.x86_64-linux.nixosConfigurations."yuki".config.system.build.nixos-rebuild', 'legacyPackages.x86_64-linux.nixosConfigurations."yuki".config.system.build.nixos-rebuild' or 'nixosConfigurations."yuki".config.system.build.nixos-rebuild'
4 
{
  description = "My first flake";

  inputs = {
    nixpkgs.url = "nixpkgs/nixos-25.05";
    nixpkgs-unstable.url = "nixpkgs/nixos-unstable";
    home-manager = {
      url = "github:nix-community/home-manager/release-25.05";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    firefox-addons = {
      url = "gitlab:rycee/nur-expressions?dir=pkgs/firefox-addons";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    nyaa = {
      url = "github:Beastwick18/nyaa";
      inputs.nixpkgs.follows = "nixpkgs";
    };


    textfox.url = "github:adriankarlen/textfox";

  };

  outputs = { self, nixpkgs, nixpkgs-unstable, home-manager, nur, nyaa, firefox-addons, ... }@inputs: let

      system = "x86_64-linux";
      pkgs-unstable = nixpkgs-unstable.legacyPackages.${system};
      lib = nixpkgs.lib;
      pkgs = nixpkgs.legacyPackages.${system};

    in {

      nixosConfigurations = {
        yuki = nixpkgs.lib.nixosSystem {
          inherit system;
          modules = [ ./hosts/yuki/configuration.nix ];
          specialArgs = {
            hostname = "yuki";
            inherit pkgs-unstable inputs;
          };
        };
        kumokon = nixpkgs.lib.nixosSystem {
          inherit system;
          modules = [ ./hosts/kumokon/configuration.nix ];
          specialArgs = {
            hostname = "kumokon";
            inherit pkgs-unstable inputs;
          };
        };
        thinker = nixpkgs.lib.nixosSystem {
          inherit system;
          modules = [ ./hosts/thinker/configuration.nix ];
          specialArgs = {
            hostname = "thinker";
            inherit pkgs-unstable inputs;
          };
        };
      };

      homeConfigurations = {
        "safri@yuki" = home-manager.lib.homeManagerConfiguration {
          inherit pkgs;
          extraSpecialArgs = {inherit inputs;};

          modules = [ ./hosts/yuki/home.nix ];
        };
        "safri@thinker" = home-manager.lib.homeManagerConfiguration {
          inherit pkgs;
          extraSpecialArgs = {inherit inputs;};

          modules = [ ./hosts/yuki/home.nix ];
        };
      };
    };

}

Everything is working now with this flake, I don’t think it had anything to do with the flake though, I think I just needed to add “nixosConfigurations.yuki” to the build command.

safri@yuki:~/ > nh os switch ~/.nix#nixosConfigurations.yuki
5

You should not need to. Something is very wrong:

That is simply not the correct attribute to be building. if I were you I would check if the nixos-rebuild script is actually the same as upstream’s. I guess it’s possible you’ve grabbed a newer version of it than your actual nixpkgs version and the attribute is changing or such?

6

both nixos-rebuild and nixos-rebuild-ng seem to build that attribute

7

Yep, fair enough, it’s done when using switch or boot.

Something is definitely still broken, however.

8

Yea I’m honestly not sure whats happening but its able to build when I preface “nixosConfigurations” and I’m able to specify which host I’m building from.

There was also a period when my server “kumokon” was able to run “nh os switch ~/.nix#$host” just fine but I can’t seem to reproduce that anymore over ssh.