{
  description = "Matabas — databas för mat";

  inputs = {
    nixpkgs.url = "github:NixOs/nixpkgs/nixos-23.05";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { self, flake-utils, nixpkgs }:
    flake-utils.lib.eachDefaultSystem (system:
      let pkgs = nixpkgs.legacyPackages.${system};
      in rec {
        packages = rec {
          postgres = pkgs.postgresql_15_jit;

          default = pkgs.hello;
        };
        devShells.default = pkgs.mkShell {
          packages = [ packages.default packages.postgres ];
          shellHook = ''
            set -e
            [ -d ./matabas-db ] || pg_ctl initdb --pgdata=./matabas-db
            mkdir -p ./matabas-db/socket

            [ -f matabas-db/matabas.log ] && mv -f matabas-db/matabas.log{,.old}
            pg_ctl start --pgdata=./matabas-db --log=./matabas-db/matabas.log --options="-p 2137"
            trap 'pg_ctl stop --pgdata=./matabas-db' EXIT

            createdb -p 2137 matabas || : 3

            set +e
          '';
        };
      }
    ) // {
      nixosConfigurations.matabas-container =
        let pkgs = nixpkgs.legacyPackages.x86_64-linux;
        in nixpkgs.lib.nixosSystem {
          system = "x86_64-linux";
          modules = [({ pkgs, ... }: {
            boot.isContainer = true;
            system.configurationRevision = nixpkgs.lib.mkIf (self ? rev) self.rev;
            system.stateVersion = "23.05";
            environment.systemPackages = [ self.packages.x86_64-linux.default ];
          })];
        };
    };
}