# Nixpkgs overlay with GNUnet-related packages
This repository contains experimental packages related to [GNUnet](https://gnunet.org) for the [Nix package manager](https://nixos.org/nix). There exists a GNUnet package in the official nixpkgs repository but as GNUnet is still under heavy development, it is recommended to use a fairly recent version from the master branch of GNUnet's git repository.

Currently the overlay provides these packages:

- GNUnet itself
- libgnurl

## Installation of the GNUnet service (NixOS)
On NixOS we can install this overlay system-wide and then enable the GNUnet service. This will install the *multi-user setup* as described in the [official documentation](https://docs.gnunet.org/handbook/gnunet.html#Installing-GNUnet). We have to add this to our ``/etc/nixos/configuration.nix``:

```
{ config, pkgs, ... }:

{
  ...
  nixpkgs.overlays = [
    (import (fetchGit https://ulrich.earth/code/nixpkgs-gnunet))
  ];

  services.gnunet = {
    enable = true;
  };
  ...
}
```

We can add options to the global GNUnet configuration file like this:

```
  services.gnunet = {
    enable = true;
    extraOptions = ''
      [NAT]
      ENABLE_UPNP = NO

      [FS]
      IMMEDIATE_START = NO
    '';
  };
```

After running ``nixos-rebuild switch`` the GNUnet system services should be running (we still have to [start GNUnet per user](https://docs.gnunet.org/handbook/gnunet.html#Starting-GNUnet):

```
$ touch ~/.config/gnunet.conf
$ gnunet-arm -s
```

## Installation of the GNUnet package (Nix on other systems)
We can install the overlay into the user environment like this:

```shell
$ ln -s ~/.config/nixpkgs/overlays/gnunet-overlay.nix gnunet-overlay
```
Now we can install the GNUnet package for our user. This will allow a *single-user setup* as described in the [official documentation](https://docs.gnunet.org/handbook/gnunet.html#Installing-GNUnet).

```shell
$ nix-env -f '<nixpkgs>' -iA gnunet
```

Now we can [start GNUnet](https://docs.gnunet.org/handbook/gnunet.html#Starting-GNUnet):

```
$ touch ~/.config/gnuent.conf
$ gnuent-arm -s
```