In reply to @balsoft:balsoft.ru
What do you mean by "type" of an input?

If my understanding is correct, upon evaluating a flake, the directory where the flake resides is copied into the nix store. However when I attempt to reference a subdirectory of the flake directory within flake.nix itself, I can an error that the file does not exist even though it does.

<...>
users.users =
              builtins.listToAttrs (map
                (user: {
                  name = user;
                  value = {               
                    passwordFile = builtins.toString (./. + "/users/${user}/secrets/passwd");
                  };
                }) attr.users);
<...>

results in something like warning: password file ‘/nix/store/g76a07317yanvwp8lrib7zpji6flxpn1-source/users/user/secrets/passwd’ does not exist

If my understanding is correct, upon evaluating a flake, the directory where the flake resides is copied into the nix store. However when I attempt to reference a subdirectory of the flake directory within flake.nix itself, I get an error that the file does not exist even though it does.

<...>
users.users =
              builtins.listToAttrs (map
                (user: {
                  name = user;
                  value = {               
                    passwordFile = builtins.toString (./. + "/users/${user}/secrets/passwd");
                  };
                }) attr.users);
<...>

results in something like warning: password file ‘/nix/store/g76a07317yanvwp8lrib7zpji6flxpn1-source/users/user/secrets/passwd’ does not exist

If my understanding is correct, upon evaluating a flake, the directory where the flake resides is copied into the nix store. However when I attempt to reference a subdirectory of the flake directory within flake.nix itself, I get an error that the file does not exist even though it does.

<...>
users.users =
  builtins.listToAttrs (map
    (user: {
      name = user;
      value = {               
        passwordFile = builtins.toString (./. + "/users/${user}/secrets/passwd");
      };
    }) attr.users);
<...>

results in something like warning: password file ‘/nix/store/g76a07317yanvwp8lrib7zpji6flxpn1-source/users/user/secrets/passwd’ does not exist

Can you tell me why I get this

❯ sh /git-repos/nixos-config-desktop/apply-users.sh
/git-repos/nixos-config-desktop ~
warning: Git tree '/git-repos/nixos-config-desktop' is dirty
error: attribute 'currentSystem' missing

       at /nix/store/svybjwf9ab3iqiz8zwwqwbqzksl3gx8v-source/pkgs/top-level/impure.nix:18:43:

           17|   # (build, in GNU Autotools parlance) platform.
           18|   localSystem ? { system = args.system or builtins.currentSystem; }
             |                                           ^
           19|

This is what /git-repos/nixos-config-desktop/apply-users.sh does

#!/bin/sh
pushd /git-repos/nixos-config-desktop
nix build .#homeManagerConfigurations.papojari.activationPackage
./result/activate
popd

Here is the content of my flake

{
	description = "papojari's NixOS configuration";

	inputs = {
		nixpkgs.url = "nixpkgs/nixos-unstable";
		home-manager.url = "github:nix-community/home-manager/master";
		home-manager.inputs.nixpkgs.follows = "nixpkgs";
	};

	outputs = { nixpkgs, home-manager, ... }:
	let
		pkgs = import nixpkgs {
			config = {
				allowUnfree = true;
			};
		};
		lib = nixpkgs.lib;
	in {
		homeManagerConfigurations = {
			papojari = home-manager.lib.homeManagerConfiguration {
				system = "x86_64-linux";
				inherit pkgs;
				username = "papojari";
				homeDirectory = "/home/papojari";
				configuration = {
					imports = [
						./users/papojari/home.nix
					];
				};
			};
		};
		nixosConfigurations = {
			Cryogonal = lib.nixosSystem {
				system = "x86_64-linux";
				modules = [
					./system/configuration-amd.nix
				];
			};
			Cryogonull = lib.nixosSystem {
				system = "aarch64-linux";
				modules = [
					./system/configuration-rpi4.nix
				];
			};
		};
	};
}

you can also have a look at the the here

Can you tell me why I get this

❯ sh /git-repos/nixos-config-desktop/apply-users.sh
/git-repos/nixos-config-desktop ~
warning: Git tree '/git-repos/nixos-config-desktop' is dirty
error: attribute 'currentSystem' missing

       at /nix/store/svybjwf9ab3iqiz8zwwqwbqzksl3gx8v-source/pkgs/top-level/impure.nix:18:43:

           17|   # (build, in GNU Autotools parlance) platform.
           18|   localSystem ? { system = args.system or builtins.currentSystem; }
             |                                           ^
           19|

This is what /git-repos/nixos-config-desktop/apply-users.sh does

#!/bin/sh
pushd /git-repos/nixos-config-desktop
nix build .#homeManagerConfigurations.papojari.activationPackage
./result/activate
popd

Here is the content of my flake

{
	description = "papojari's NixOS configuration";

	inputs = {
		nixpkgs.url = "nixpkgs/nixos-unstable";
		home-manager.url = "github:nix-community/home-manager/master";
		home-manager.inputs.nixpkgs.follows = "nixpkgs";
	};

	outputs = { nixpkgs, home-manager, ... }:
	let
		pkgs = import nixpkgs {
			config = {
				allowUnfree = true;
			};
		};
		lib = nixpkgs.lib;
	in {
		homeManagerConfigurations = {
			papojari = home-manager.lib.homeManagerConfiguration {
				system = "x86_64-linux";
				inherit pkgs;
				username = "papojari";
				homeDirectory = "/home/papojari";
				configuration = {
					imports = [
						./users/papojari/home.nix
					];
				};
			};
		};
		nixosConfigurations = {
			Cryogonal = lib.nixosSystem {
				system = "x86_64-linux";
				modules = [
					./system/configuration-amd.nix
				];
			};
			Cryogonull = lib.nixosSystem {
				system = "aarch64-linux";
				modules = [
					./system/configuration-rpi4.nix
				];
			};
		};
	};
}

you can also have a look at the files here

In reply to @elonsroadster:matrix.org
@papojari You cant use current-system in flakes