Hi, can anyone provide me a full working example of a colmena hive.nix for deploying a single host? Unfortunately, the documentation hasn't been of much help since it doesn't describe which flake to use for a host, etc.

Currently my hive.nix is this:

{
  # description = "A NixOS configuration using Flakes";

  inputs = { nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable"; };
  outputs = { self, nixpkgs, ... }:
    let
      system = "x86_64-linux";
      pkgs = import nixpkgs { inherit system; };
    in {
      # packages.${system} = { default = pkgs.callPackage ./default.nix { }; };
      colmena = {
        meta = {
          nixpkgs = import nixpkgs {
            system = "x86_64-linux";
            overlays = [ ];
          };
        };
        # nixosConfigurations = {
        andromeda = {
          system = "x86_64-linux";
          imports = [ ./hosts/andromeda/andromeda.nix ];
          deployment.targetHost = "andromeda";
        };
        # };
      };
    };
}

Which gives me errors:

[nix-shell:~/Documentos/NixOS]$ : 1725162633:0;colmena apply 
[INFO ] Using configuration: /home/khalil/Documentos/NixOS/hive.nix
[INFO ] Enumerating nodes...
error:
       … while evaluating attribute 'inputs'

         at /nix/store/3m9sp0j8i8032nin10vbfm548q1brlb7-nixos-24.05/nixos/lib/attrsets.nix:984:14:

          983|     value:
          984|     { inherit name value; };
             |              ^
          985|

       … while evaluating the attribute 'config.deployment'

         at /nix/store/3m9sp0j8i8032nin10vbfm548q1brlb7-nixos-24.05/nixos/lib/modules.nix:322:9:

          321|         options = checked options;
          322|         config = checked (removeAttrs config [ "_module" ]);
             |         ^
          323|         _module = checked (config._module);

       (stack trace truncated; use '--show-trace' to show the full trace)

       error: The option `nixpkgs.url' does not exist. Definition values:
       - In `/tmp/colmena-assets-l0SXJi/eval.nix': "github:NixOS/nixpkgs/nixos-unstable"
[ERROR] -----
[ERROR] Operation failed with error: Child process exited with error code: 1
Hint: Backtrace available - Use `RUST_BACKTRACE=1` environment variable to display a backtrace

In reply to @khalil:ksantana.net

Hi, can anyone provide me a full working example of a colmena hive.nix for deploying a single host? Unfortunately, the documentation hasn't been of much help since it doesn't describe which flake to use for a host, etc.

Currently my hive.nix is this:

{
  # description = "A NixOS configuration using Flakes";

  inputs = { nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable"; };
  outputs = { self, nixpkgs, ... }:
    let
      system = "x86_64-linux";
      pkgs = import nixpkgs { inherit system; };
    in {
      # packages.${system} = { default = pkgs.callPackage ./default.nix { }; };
      colmena = {
        meta = {
          nixpkgs = import nixpkgs {
            system = "x86_64-linux";
            overlays = [ ];
          };
        };
        # nixosConfigurations = {
        andromeda = {
          system = "x86_64-linux";
          imports = [ ./hosts/andromeda/andromeda.nix ];
          deployment.targetHost = "andromeda";
        };
        # };
      };
    };
}

Which gives me errors:

[nix-shell:~/Documentos/NixOS]$ : 1725162633:0;colmena apply 
[INFO ] Using configuration: /home/khalil/Documentos/NixOS/hive.nix
[INFO ] Enumerating nodes...
error:
       … while evaluating attribute 'inputs'

         at /nix/store/3m9sp0j8i8032nin10vbfm548q1brlb7-nixos-24.05/nixos/lib/attrsets.nix:984:14:

          983|     value:
          984|     { inherit name value; };
             |              ^
          985|

       … while evaluating the attribute 'config.deployment'

         at /nix/store/3m9sp0j8i8032nin10vbfm548q1brlb7-nixos-24.05/nixos/lib/modules.nix:322:9:

          321|         options = checked options;
          322|         config = checked (removeAttrs config [ "_module" ]);
             |         ^
          323|         _module = checked (config._module);

       (stack trace truncated; use '--show-trace' to show the full trace)

       error: The option `nixpkgs.url' does not exist. Definition values:
       - In `/tmp/colmena-assets-l0SXJi/eval.nix': "github:NixOS/nixpkgs/nixos-unstable"
[ERROR] -----
[ERROR] Operation failed with error: Child process exited with error code: 1
Hint: Backtrace available - Use `RUST_BACKTRACE=1` environment variable to display a backtrace

I am bit lost trying to get colmena working. Especially the meta is a bit of mystery

      colmena = {
        meta = {
          nixpkgs = nixpkgs-stable;
          # nixpkgs = import nixpkgs-stable {
          #   system = "x86_64-linux";
          #   overlays = [];
          # };
          # nixpkgs = <nixpkgs-stable>;
          # nixpkgs = import <nixpkgs-stable> {
          #   system = "x86_64-linux";
          #   overlays = [];
          # };
          # specialArgs = { inherit inputs; };
        };

        utm-arm = import self.nixosConfigurations.utm-arm {
          deployment = {