Patched Caddy NixOS flake

Caddy's third-party plugins are installed by adding them as import in cmd/caddy/main.go and compiling caddy. This can be done either using the xcaddy utility as described here in the official docs or by creating a main.go file with the import and compiling with go build manually. This process is outlined in the upstream here. The xcaddy utility is not suited for deployment on NixOS where a sandboxed, reproducible build is required.

This flake compiles caddy from a custom main.go file as outlined above, currently only adding the cloudflare dns plugin. The caddy package of this flake's output will be caddy with that plugin baked in.

To modify/add plugins:

1. Edit src/main.go as per the upstream docs
2. Run go mod tidy
3. If necessary, update the hash in flake.nix
4. Run nix build

You should get a result with the compiled caddy. To verify that the plugins were correctly added use:

./result/bin/caddy list-modules

You should see the non-standard modules you added above this line at the end:

  Non-standard modules: n

Cachix

To make use of this repository's cachix binary cache, you can follow the instructions at this link, or add these to your nix configuration:

{
  nix.settings = {
    substituters = [
      "https://caddycf.cachix.org"
    ];

    trusted-public-keys = [
      "caddycf.cachix.org-1:6vbQaeiec/zKv9XfEwi9yWVCe7opbeJMu6w81UEXugY="
    ];
  };
}