matabas/flake.nix

{
  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

            log() {
              printf '\e[1m\e[38;5;87m==>\e[0m\e[1m %s.\e[0m\n' "$*"
            }

            log "Checking for existing postgres directory"
            [ -d ./matabas-db ] || {
              log "Non-existent, creating postgres directory (./matabas-db)"
              pg_ctl initdb --pgdata=./matabas-db
            }

            [ -f matabas-db/matabas.log ] && {
              log "Moving logs from last session into log archive (./matabas-db/matabas.log.old)"
              cat matabas-db/matabas.log >> matabas-db/matabas.log.old
              rm -f matabas-db/matabas.log
            }

            log "Starting postgres"
            pg_ctl start --pgdata=./matabas-db --log=./matabas-db/matabas.log --options="-p 2137"
            trap 'log "Stopping postgres" && pg_ctl stop --pgdata=./matabas-db' EXIT

            log "Creating database"
            createdb -p 2137 matabas 2>>./matabas-db/matabas.log || log "Database already exists, not overwriting"

            log "Environment ready!"

            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 ];
          })];
        };
    };
}