misc_nixos-mailserver/nix/sources.json

{
    "nixpkgs-20.03": {
        "branch": "nixos-20.03",
        "description": "A read-only mirror of NixOS/nixpkgs tracking the released channels. Send issues and PRs to",
        "homepage": "https://github.com/NixOS/nixpkgs",
        "owner": "NixOS",
        "repo": "nixpkgs-channels",
        "rev": "aaa66d8d887c73f643246ac1a684fcb1521543b8",
        "sha256": "0qvrhc7hv8h4yqa4jh64y6v5j3nza53ivkbq6j72g434c3yp2h50",
        "type": "tarball",
        "url": "https://github.com/NixOS/nixpkgs-channels/archive/aaa66d8d887c73f643246ac1a684fcb1521543b8.tar.gz",
        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
    }
}