Hi everyone,
I’m pretty new to NixOS (coming from years of Arch, btw). So please bare with me 
I have a flake based configuration and followed official Flake install instruction at Home Manager Manual
./flake.nix:
{
description = "A Nix flake for my personal system configuration";
inputs = {
nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.11";
flake-utils.url = "github:numtide/flake-utils";
home-manager.url = "github:nix-community/home-manager";
home-manager.inputs.nixpkgs.follows = "nixpkgs";
};
outputs = inputs@{ nixpkgs, home-manager, ... }: {
nixosConfigurations = {
tuxedonix = nixpkgs.lib.nixosSystem {
system = "x86_64-linux";
modules = [
./nixos/configuration.nix
home-manager.nixosModules.home-manager
{
home-manager.useGlobalPkgs = true;
home-manager.useUserPackages = true;
home-manager.users.gbr = import ./home-manager/home.nix;
# Optionally, use home-manager.extraSpecialArgs to pass
# arguments to home.nix
}
];
};
};
};
}
./home-manager/home.nix
{ config, pkgs, ... }:
{
home.username = "gbr";
home.homeDirectory = "/home/gbr";
home.stateVersion = "23.11"; # Please read the comment before changing.
home.packages = [
pkgs.hello
];
home.file = {
};
home.sessionVariables = {
# EDITOR = "emacs";
};
# Let Home Manager install and manage itself.
programs.home-manager.enable = true;
}
./nixos/configuration.nix
{ config, pkgs, ... }:
{
imports =
[ # Include the results of the hardware scan.
./hardware-configuration.nix
#include all modules from nixos/modules
./modules/system.nix
./modules/networking.nix
./modules/bootloader.nix
./modules/filesystems.nix
./modules/displaymanager.nix
./modules/hardware.nix
./modules/services.nix
./modules/windowmanager.nix
./modules/desktop.nix
./modules/fonts.nix
./modules/packages.nix
./modules/users.nix
];
# enable flakes
nix.settings.experimental-features = [ "nix-command" "flakes" ];
nixpkgs.config = {
allowUnfree = true;
};
# This value determines the NixOS release from which the default
# settings for stateful data, like file locations and database versions
# on your system were taken. It‘s perfectly fine and recommended to leave
# this value at the release version of the first install of this system.
# Before changing this value read the documentation for this option
# (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
system.stateVersion = "23.11"; # Did you read the comment?
}
nixos-rebuild switch --flake ~/nix-config/#tuxedonix errors out
error output
nixos-rebuild switch --flake ~/nix-config/#tuxedonix
building the system configuration...
error:
… while calling the 'head' builtin
at /nix/store/7q4y8idjk2di380j1fxn4k7wx9y935cl-source/lib/attrsets.nix:922:11:
921| || pred here (elemAt values 1) (head values) then
922| head values
| ^
923| else
… while evaluating the attribute 'value'
at /nix/store/7q4y8idjk2di380j1fxn4k7wx9y935cl-source/lib/modules.nix:807:9:
806| in warnDeprecation opt //
807| { value = builtins.addErrorContext "while evaluating the option `${showOption loc}':" value;
| ^
808| inherit (res.defsFinal') highestPrio;
(stack trace truncated; use '--show-trace' to show the full trace)
error: attribute 'attrTag' missing
at /nix/store/0b11p5g24mgl5qfg34khvjs3fh91vdx4-source/modules/services/kanshi.nix:9:19:
8|
9| directivesTag = types.attrTag {
| ^
10| profile = mkOption {
I really wish those errors were less cryptic…
I discovered that home-manager.users.gbr = import ./home-manager/home.nix; in flake.nix causes the error. When I comment it out, the build goes through.
But home-manager CLI is not available. So it seems, it did not get installed from the flake.
In the HM docs for installing as a Nix Module (no flake) it says
It is then possible to add
imports = [ <home-manager/nixos> ];
to your system configuration.nix file, which will introduce a new NixOS option called home-manager.users whose type is an attribute set that maps user names to Home Manager configurations.
This and the missing home-manager CLI command seems to confirm that hm does not get installed and home-manager.users option is not available. Hence the error.
I thought that installing HM in my flake inputs will make it available to the config. So I seem to be missing a vital installation step?
But the docs don’t mention a separate installation step being required.
I did a nix flake update which downloaded some stuff, but error persists.
Also did nix-collect-garbage -d and rm -rf ~/.cache/nix. No luck.
I’ve been going around circles for hours already, Have watched numerous YT vids, read all installation related threads I could find here and searched and read tons on the web. To no avail.
Now I’m stuck and really would appreciate your help.