nixos - override services in nixpkgs for nixops deployment -

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using nixops 1 can configure services like:

{   network.description = "web server";   webserver = { config, pkgs, ... }:      {      services.mysql = {       enable = true;       package = pkgs.mysql51;     };

but want extend services. example using override done pkgs below:

  let     myfoo = callpackage ...   in   pkgs = pkgs.override {     overrides = self: super: {       myfoo-core = myfoo;     };   }

question

how services?

adding service requires first write service definition service. is, nix file declares options of service , provides implementation.

let's our service called foo, write service definition save file foo.nix:

{ config, lib, pkgs, ... }:  lib;  # use functions lib, such mkif  let   # values of options set service user of service   foocfg = config.services.foo; in {   ##### interface. here define options users of our service can specify   options = {     # options our service located under services.foo     services.foo = {        enable = mkoption {         type = types.bool;         default = false;         description = ''           whether enable foo.         '';       };        baroption = {         type = types.str;         default = "qux";         description = ''           bar option foo.         '';       };     };   };    ##### implementation   config = mkif foocfg.enable { # apply following settings if enabled     # here options can specified in configuration.nix may used     # configure systemd services     # add system users     # write config files, example here:     environment.etc."foo-bar" = {       text = foocfg.bar; # can use values of options service here     };   };

for example, hydra, file can found here: https://github.com/nixos/hydra/blob/dd32033657fc7d6a755c2feae1714148ee43fc7e/hydra-module.nix.

after having written service definition, can use our main configuration this:

{   network.description = "web server";   webserver = { config, pkgs, ... }: {     imports = [ ./foo.nix ]; # import our service     services.mysql = {       enable = true;       package = pkgs.mysql51;     };     services.foo = {       enable = true;       bar = "hello nixos modules!";     };   };

}

disclaimer: there might typos in this, have not tested it.


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