[Nix-dev] Custom Channel with Custom Modules

[Paul Cooley]

We are creating a custom channel with our private artifacts for NixOS. This includes setting up users, custom daemons, and etc.
While I have the channel running without a issue, I DO have problems installing daemon services via nixos/configuration.nix.

Keep in mind all this is destined for AWS EC2.

The custom channel will be used alongside the NixOS stable channel. That's the background, so to speak.

Now, when I try and install a module, I get a number of errors regarding configs, and etc. Here's the code.
{ config, bv-nix, ... }:

with config;

let
   cfg = config.services.bv-users;
in
with bv-nix;

{
  ###### interface

  options = {
    services.bv-users = {
        enable = mkOption {
            default = true;
            type = with types; bool;
            description = "Enable the service to run.";
        };

        groupName = mkOption {
            default = "polloi";
            type = with types; uniq string;
            description = "The group name in nexus";
        };
    };
  };

  ###### implementation
    config = mkIf cfg.enable {
        jobs.bv-users = {
            description = "Start the BV User daemon for group ${cfg.groupName}.";
            startOn = "started network-interfaces";
            exec = ''/var/setuid-wrappers/sudo -u root -- ${bv-users}/bin/key_service.py'';
        };
        security.sudo.enable = true;
    };

}
The nixos configuration.nix looks like this:
{
  imports = [ <nixpkgs/nixos/modules/virtualisation/amazon-init.nix> <bv-nix/pkgs/bv-users/bv-user-daemon.nix> ];
  ec2.hvm = true;
  services.bv-users.enable = true;
  services.bv-users.groupName = "polloi";
}

I've tried various incarnations and looked through the documentation and source code, but I'm obviously missing something. One of the errors I get from doing a rebuild are:

error: while evaluating the attribute ‘config.system.build.toplevel’ at /nix/store/21ldmqrpq104n0aq3b8qzdpwamdzza9n-nixos/nixos/nixpkgs/nixos/lib/eval-config.nix:53:5:
while evaluating the attribute ‘config’ at /nix/store/21ldmqrpq104n0aq3b8qzdpwamdzza9n-nixos/nixos/nixpkgs/lib/modules.nix:86:25:
while evaluating ‘yieldConfig’ at /nix/store/21ldmqrpq104n0aq3b8qzdpwamdzza9n-nixos/nixos/nixpkgs/lib/modules.nix:73:29, called from /nix/store/21ldmqrpq104n0aq3b8qzdpwamdzza9n-nixos/nixos/nixpkgs/lib/modules.nix:72:16:
while evaluating ‘mergeModules’ at /nix/store/21ldmqrpq104n0aq3b8qzdpwamdzza9n-nixos/nixos/nixpkgs/lib/modules.nix:173:26, called from /nix/store/21ldmqrpq104n0aq3b8qzdpwamdzza9n-nixos/nixos/nixpkgs/lib/modules.nix:63:17:
while evaluating ‘mergeModules'’ at /nix/store/21ldmqrpq104n0aq3b8qzdpwamdzza9n-nixos/nixos/nixpkgs/lib/modules.nix:177:36, called from /nix/store/21ldmqrpq104n0aq3b8qzdpwamdzza9n-nixos/nixos/nixpkgs/lib/modules.nix:174:5:
while evaluating ‘concatMap’ at /nix/store/21ldmqrpq104n0aq3b8qzdpwamdzza9n-nixos/nixos/nixpkgs/lib/lists.nix:62:18, called from /nix/store/21ldmqrpq104n0aq3b8qzdpwamdzza9n-nixos/nixos/nixpkgs/lib/modules.nix:213:9:
while evaluating anonymous function at /nix/store/21ldmqrpq104n0aq3b8qzdpwamdzza9n-nixos/nixos/nixpkgs/lib/lists.nix:170:7, called from /nix/store/21ldmqrpq104n0aq3b8qzdpwamdzza9n-nixos/nixos/nixpkgs/lib/modules.nix:63:38:
while evaluating ‘closeModules’ at /nix/store/21ldmqrpq104n0aq3b8qzdpwamdzza9n-nixos/nixos/nixpkgs/lib/modules.nix:90:27, called from /nix/store/21ldmqrpq104n0aq3b8qzdpwamdzza9n-nixos/nixos/nixpkgs/lib/modules.nix:58:16:
while evaluating anonymous function at /nix/store/21ldmqrpq104n0aq3b8qzdpwamdzza9n-nixos/nixos/nixpkgs/lib/lists.nix:49:25, called from undefined position:
while evaluating anonymous function at /nix/store/21ldmqrpq104n0aq3b8qzdpwamdzza9n-nixos/nixos/nixpkgs/lib/modules.nix:92:49, called from /nix/store/21ldmqrpq104n0aq3b8qzdpwamdzza9n-nixos/nixos/nixpkgs/lib/lists.nix:49:28:
while evaluating ‘unifyModuleSyntax’ at /nix/store/21ldmqrpq104n0aq3b8qzdpwamdzza9n-nixos/nixos/nixpkgs/lib/modules.nix:107:34, called from /nix/store/21ldmqrpq104n0aq3b8qzdpwamdzza9n-nixos/nixos/nixpkgs/lib/modules.nix:98:11:
while evaluating ‘applyIfFunction’ at /nix/store/21ldmqrpq104n0aq3b8qzdpwamdzza9n-nixos/nixos/nixpkgs/lib/modules.nix:127:29, called from /nix/store/21ldmqrpq104n0aq3b8qzdpwamdzza9n-nixos/nixos/nixpkgs/lib/modules.nix:98:39:
undefined variable ‘config’ at /nix/store/k86a1d8cyzhn8kj4gsq1nc12vn301f22-user-environment/bv-nix/pkgs/bv-users/bv-user-daemon.nix:8:8

I obviously don't understand what need to be in the channel's default.nix to set up imports from the nixos channel so this can work. Or perhaps I'm doing something completely wrong. Either way, I'd appreciate comments. I plan to write up the results of this particular journey so I can add them to the nixos wiki. A lot of companies out there will need custom channels, custom module, and custom packages, that cannot be added into the public github repository. Therefore I think this a worthwhile endeavor.

Cheers.
_________________________

[Bazaarvoice]

Paul Cooley
Senior Dev Ops Engineer
o:   m: 281-435-2328
e: paul.cooley at bazaarvoice.com<mailto:paul.cooley at bazaarvoice.com>
Site<http://www.bazaarvoice.com/>  |  Blog<http://www.bazaarvoice.com/blog>  |  Twitter<http://twitter.com/Bazaarvoice>




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