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A workaround for installing GitHub-hosted package in a IPv6-only host I recently setup cloudflared on instances that power this website, while I got it working on most of them, it’s not working on IPv6-only instance. There was installation guide which I managed to resolve later (and what this post is about) and Cloudflare tunnel itself doesn’t support IPv6 yet. A quick recap on two of the main components of NixOS: module and package. A package is a program that is available on NixOS repository, the repo doesn’t contain the binary, it’s made up of nix files that describe how to compile it. In this case, cloudflared.nix is a script to download the source code from GitHub and compile it as a Go program. A module is (usually) used to install a program as a service and make it configurable via configuration.nix . For example, i2pd.nix module installs i2pd package ( pkgs.i2pd ) when services.i2pd.enable is enabled. A major issue is that GitHub doesn’t support IPv6 yet, so my IPv6-only instance couldn’t download the source code. A common workaround is to mirror the repo somewhere else that does support IPv6, which is what I did. Then, I created a new custom package nix: cloudflared-custom.nix source { lib, buildGoModule, fetchgit }: buildGoModule rec { pname = "cloudflared" ; version = "2021.6.0" ; src = fetchgit { url = "https://example.com/example/cloudflared-mirror.git" ; rev = "refs/tags/ ${version} " ; sha256 = "sha256-cX0kdBPDgwjHphxGWrnXohHPp1nzs4SnvCry4AxMtp0=" ; }; vendorSha256 = null ; doCheck = false ; buildFlagsArray = "-ldflags=-X main.Version= ${version} " ; meta = with lib; { description = "CloudFlare Argo Tunnel daemon (and DNS-over-HTTPS client)" ; homepage = "https://www.cloudflare.com/products/argo-tunnel" ; license = licenses.unfree; platforms = platforms.unix; maintainers = [ maintainers.thoughtpolice maintainers.enorris ]; }; } In my cloudflared module , I updated the following lines: options.services.argoWeb = { enable = mkEnableOption "Cloudflare Argo Tunnel"; config = mkOption { default = "/etc/caddy/argoWeb.yml"; type = types.str; description = "Path to cloudflared config"; }; dataDir = mkOption { default = "/var/lib/argoWeb"; type = types.path; description = '' The data directory, for storing credentials. ''; + package = mkOption { + default = pkgs.cloudflared; + defaultText = "pkgs.cloudflared"; + type = types.package; + description = "cloudflared package to use."; + }; ExecStart = "${pkgs.cloudflared}/bin/cloudflared --config ${cfg.config} --no-autoupdate tunnel run"; + ExecStart = "${cfg.package}/bin/cloudflared --config ${cfg.config} --no-autoupdate tunnel run"; Finally, in my configuration.nix , I configured it to use the custom package: require = [ /etc/caddy/argoWeb.nix ]; nixpkgs.config.allowUnfree = true; services.argoWeb = { enable = true; + package = pkgs.callPackage (import /etc/caddy/cloudflared-custom.nix) { }; config = "/etc/caddy/argoWeb.yml"; };