1 { nixpkgs ? import <nixpkgs> {} }:
  2 let
  3   inherit (nixpkgs) pkgs;
  4   inherit (pkgs) haskellPackages;
  5
  6   project = import ./release.nix;
  7 in
  8   pkgs.stdenv.mkDerivation {
  9     name = "shell";
 10     buildInputs = project.env.nativeBuildInputs ++ [
 11       haskellPackages.cabal-install
 12       haskellPackages.yesod-bin
 13       pkgs.cabal2nix
 14       pkgs.nix
 15       pkgs.postgresql
 16       (import ~/.config/nixpkgs/vim.nix)
 17     ];
 18   };
 19
 20   systemd.user.services.work_postgres = {
 21      Unit = { Description = "work postgres"; };
 22      Service = {
 23         WorkingDirectory = "./db";
 24
 25         ExecStart =
 26            "${pkgs.postgresql}/bin/postgres -D ./.postgres/data -k ./.postgres/run";
 27         Restart = "always";
 28      };
 29   };