Nix development utils that will blow up your mind

reService takes your nixos config of services and creates user-enabled supervisord config that you can use for development or deployment on non nixos systems. Having deterministic fullstack in development has never been more awesome.

• Create default.nix

  { pkgs ? import <nixpkgs> {}
  , projectName ? "myProject"
  , lib ? (import <nixpkgs> {}).lib
  , nix-rehash ? import <nix-rehash> }:
    with lib;
  
  let
    services = nix-rehash.reService {
      name = "${projectName}";
      configuration = let servicePrefix = "/tmp/${projectName}/services"; in [
        ({ config, pkgs, ...}: {
          services.postgresql.enable = true;
          services.postgresql.package = pkgs.postgresql92;
          services.postgresql.dataDir = "${servicePrefix}/postgresql";
        })
      ];
    };
  in myEnvFun {
    name = projectName;
    buildInputs = [ services ];
  }
  

• install nix-env -f default.nix -i

• load environemnt load-env-myProject

• start services myProject-start-services, control services myProject-control-services, stop services myProject-stop-services

Now build this with hydra and pass the environment around :)

Alternative using nix-shell:

• set buildInputs = [ services.config.supervisord.bin ];
• run nix-shell
• use supervisord and supervisorctl as you wish

reContain makes nixos enabled installable container that can auto-update itself. Now you can build container on hydra and auto update it on host machine. Staging or deployments have never been easier :)

• Create default.nix

  { pkgs ? import <nixpkgs>
  , lib ? (import <nixpkgs> {}).lib
  , name ? "myProject"
  , nix-rehash ? import <nix-rehash> }:
    with lib;
    with pkgs;
  
  {
    container = nix-rehash.reContain {
      inherit name;
      configuration = [{
      services.openssh.enable = true;
      services.openssh.ports = [ 25 ];
      users.extraUsers.root.openssh.authorizedKeys.keys = [ (builtins.readFile ./id_rsa.pub) ];
      }];
    };
  }
  

• do nix-env [-f default.nix] -i myProject-container or build with hydra and add a channel

• start container: sudo myProject-container-start

• ssh to container: ssh localhost -p 25

• enable auto updates with cron:

  * * * * * nix-env -i myProject-container && sudo $HOME/.nix-profile/bin/myProject-update-container
  

• stop container: sudo myProject-container-stop