feat: attempt to add Claude Desktop, but failing

[GregHilston]

We we're following the documentation detailed here.

I'm aware that the documentation details leveraging NIXPGS_ALLOW_UNFREE, however I thought that our usage of allowUnfree both in modules/common/default.nix and modules/home/defualt.nix would mean we weouldn't have to do anything else... It seems like our allowUnfree is not being plumbed
correctly...

We're experiencing the following error when attempting to deploy these configuration changes:

just deploy foundation
sudo nixos-rebuild switch --flake .#foundation
warning: Git tree '/home/ghilston/Git/toolbox' is dirty
warning: updating lock file '/home/ghilston/Git/toolbox/nixos/flake.lock':
• Added input 'claude-desktop':
    'github:k3d3/claude-desktop-linux-flake/722b1c5ffe427dfc1473e4dd371796cffddc2d6b?narHash=sha256-cg8hkvtb%2B7RfhHI%2B2KTYAHU9uxJr83rrANQ1IWpK00M%3D' (2024-12-24)
• Added input 'claude-desktop/flake-utils':
    follows 'flake-utils'
• Added input 'claude-desktop/nixpkgs':
    follows 'nixpkgs'
• Added input 'flake-utils':
    'github:numtide/flake-utils/11707dc2f618dd54ca8739b309ec4fc024de578b?narHash=sha256-l0KFg5HjrsfsO/JpG%2Br7fRrqm12kzFHyUHqHCVpMMbI%3D' (2024-11-13)
• Added input 'flake-utils/systems':
    'github:nix-systems/default/da67096a3b9bf56a91d16901293e51ba5b49a27e?narHash=sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768%3D' (2023-04-09)
warning: Git tree '/home/ghilston/Git/toolbox' is dirty
evaluation warning: nur.overlay has been replaced by nur.overlays.default
building the system configuration...
warning: Git tree '/home/ghilston/Git/toolbox' is dirty
evaluation warning: nur.overlay has been replaced by nur.overlays.default
error:
       … while calling the 'head' builtin
         at /nix/store/6zgbbqlr7nnfxpzkyj7fsl4fpg89jbw0-source/lib/attrsets.nix:1574:11:
         1573|         || pred here (elemAt values 1) (head values) then
         1574|           head values
             |           ^
         1575|         else

       … while evaluating the attribute 'value'
         at /nix/store/6zgbbqlr7nnfxpzkyj7fsl4fpg89jbw0-source/lib/modules.nix:846:9:
          845|     in warnDeprecation opt //
          846|       { value = addErrorContext "while evaluating the option `${showOption loc}':" value;
             |         ^
          847|         inherit (res.defsFinal') highestPrio;

       … while evaluating the option `system.build.toplevel':

       … while evaluating definitions from `/nix/store/6zgbbqlr7nnfxpzkyj7fsl4fpg89jbw0-source/nixos/modules/system/activation/top-level.nix':

       … while evaluating the option `warnings':

       … while evaluating definitions from `/nix/store/6zgbbqlr7nnfxpzkyj7fsl4fpg89jbw0-source/nixos/modules/system/boot/systemd.nix':

       … while evaluating the option `systemd.services.home-manager-ghilston.serviceConfig':

       … while evaluating definitions from `/nix/store/6zgbbqlr7nnfxpzkyj7fsl4fpg89jbw0-source/flake.nix':

       … while evaluating the option `home-manager.users.ghilston.home.file."/home/ghilston/.config/fontconfig/conf.d/10-hm-fonts.conf".source':

       … while evaluating definitions from `/nix/store/mdzxa36ixdm9g8yli9h73izv3kpj7xjq-source/modules/files.nix':

       … while evaluating the option `home-manager.users.ghilston.home.file."/home/ghilston/.config/fontconfig/conf.d/10-hm-fonts.conf".text':

       … while evaluating definitions from `/nix/store/mdzxa36ixdm9g8yli9h73izv3kpj7xjq-source/modules/misc/xdg.nix':

       … while evaluating the option `home-manager.users.ghilston.xdg.configFile."fontconfig/conf.d/10-hm-fonts.conf".text':

       … while evaluating definitions from `/nix/store/mdzxa36ixdm9g8yli9h73izv3kpj7xjq-source/modules/misc/fontconfig.nix':

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

       error: Package ‘claude-desktop-0.7.7’ in /nix/store/al4vmxx16ki3dq4yn8dwjxyby73dxnvv-source/pkgs/claude-desktop.nix:128 has an unfree license (‘unfree’), refusing to evaluate.

       a) To temporarily allow unfree packages, you can use an environment variable
          for a single invocation of the nix tools.

            $ export NIXPKGS_ALLOW_UNFREE=1

          Note: When using `nix shell`, `nix build`, `nix develop`, etc with a flake,
                then pass `--impure` in order to allow use of environment variables.

       b) For `nixos-rebuild` you can set
         { nixpkgs.config.allowUnfree = true; }
       in configuration.nix to override this.

       Alternatively you can configure a predicate to allow specific packages:
         { nixpkgs.config.allowUnfreePredicate = pkg: builtins.elem (lib.getName pkg) [
             "claude-desktop"
           ];
         }

       c) For `nix-env`, `nix-build`, `nix-shell` or any other Nix command you can add
         { allowUnfree = true; }
       to ~/.config/nixpkgs/config.nix.
error: Recipe `deploy` failed on line 4 with exit code 1

I've gone down a free rabbit holes trying to resolve this, but have not made any additional progress figuring out what I'm doing wrong...