handle multiple repos

Assuming that ./repo1 and ./repo2 are separate git repositories.

Both repos have a single package repo1/my-app and repo2/my-tool.

In order to build repo1/my-app we need repo2/my-tool as a build time dependency.

The following structure is assumed:

├── repo1
│  ├── default.nix
│  └── my-app.nix
└── repo2
   ├── default.nix
   └── my-tool.nix

contents of repo1/my-app.nix

repo1/my-app.nix

{config, lib, dream2nix, ...}: {

  imports = [
    dream2nix.modules.nodejs.mkDerivation
    dream2nix.modules.nodejs.package-lock
  ];

  src = ./.;

  # include my-tool from repo2
  deps = {repo2, ...}: {
    inherit (repo2) my-tool;
  };

  # add my-tool as build time dependency
  nativeBuildInputs = [
    config.deps.my-tool
  ];

  # use my-tool to build my-app
  buildPhase = ''
    my-tool build
    echo "done building"
  '';
}

contents of repo1/default.nix

repo1/default.nix

{
  pkgs ? import <nixpkgs> {},
  dream2nix ?
    import
    (builtins.fetchTarball "https://dream2nix.dev/tarball/1.0")
    {inherit pkgs;},
}: {
  packages.my-app = dream2nix.eval
    {
      packageSets.nixpkgs = pkgs;

      # fetchGit could be used here alternatively
      packageSets.repo2 = import ../repo2/default.nix {};
    }
    ./my-app.nix;
}