Install via nix-channel

As root run:

$ sudo nix-channel --add https://github.com/ryantm/agenix/archive/main.tar.gz agenix
$ sudo nix-channel --update

Install module via nix-channel

Then add the following to your configuration.nix in the imports list:

{
  imports = [ <agenix/modules/age.nix> ];
}

Install Home Manager module via nix-channel

Add the following to your Home Manager configuration:

{
  imports = [ <agenix/modules/age-home.nix> ];
}

Install CLI via nix-channel

To install the agenix binary:

{
  environment.systemPackages = [ (pkgs.callPackage <agenix/pkgs/agenix.nix> {}) ];
}