nixos-config/machines/fuuko/services/binary-cache.nix

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# This serves a local binary cache. If the request comes from my home network,
# it will set its priority higher than cache.nixos.org (which has a priority of
# 40), so local devices get a faster binary cache. If the request coes from
# outside my home network, it will set its priority lower, only store paths
# exclusive to this cache will be substituted.
# This only works well when a host does not change its “location”, since nix
# caches binary caches locally (per-user, also for root!) in
# ${XDG_CACHE_HOME:-$HOME/.cache}/.cache/nix/binary-cache-v6.sqlite and does
# not re-check or invalidate them. Devices that often are not at home should
# ensure that the cached priority is 50 to avoid slow substitutions.
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{ config, lib, pkgs, ... }:
let
binaryCachePath = "/data/cache/nix-binary-cache";
in
{
sops.secrets.nix-binary-cache-htpasswd = {
owner = "nginx";
sopsFile = ../secrets.yaml;
};
services.nginx = {
appendHttpConfig = ''
geo $nix_binary_cache_priority {
default 50;
192.168.100.0/24 30;
2001:470:1f0b:abc::/64 30;
}
'';
virtualHosts."nix-cache.sbruder.de" = rec {
enableACME = true;
forceSSL = true;
root = binaryCachePath;
locations = {
"/nix-cache-info" = {
return = "200 \"StoreDir: /nix/store\\nPriority: $nix_binary_cache_priority\\n\"";
};
"/".extraConfig = ''
log_not_found off;
client_max_body_size 5G;
# WebDAV (for uploading)
dav_methods PUT DELETE;
create_full_put_path on; # nar/ does not exist by default
dav_access user:rw group:r all:r;
# same filesystem for temporary files
client_body_temp_path ${root}/.upload-tmp;
limit_except GET {
auth_basic "restricted upload";
auth_basic_user_file ${config.sops.secrets.nix-binary-cache-htpasswd.path};
}
'';
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"/nix/store/".proxyPass = "http://localhost:${config.systemd.services.nar-serve.environment.PORT}";
};
};
};
systemd.services.nginx.serviceConfig.ReadWritePaths = lib.singleton binaryCachePath;
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# TODO 21.05: Replace with upstream module
systemd.services.nar-serve =
let
# TODO: remove once new version is released and in nixpkgs
nar-serve = pkgs.unstable.nar-serve.overrideAttrs (o: o // {
version = "unstable-2021-04-08";
src = pkgs.fetchFromGitHub {
owner = "numtide";
repo = "nar-serve";
rev = "4243b0efa41910dfa4be8b9936ae460699d3f8f0";
sha256 = "0mjs3yilf5rixm67wk4h4jji54dsc0w3vfxd561pvfbxplbmgh3c";
};
});
in
{
after = [ "network.target" ];
wantedBy = [ "multi-user.target" ];
environment = {
PORT = "8383";
NAR_CACHE_URL = "file://${binaryCachePath}";
};
serviceConfig = {
Restart = "always";
RestartSec = "5s";
ExecStart = "${nar-serve}/bin/nar-serve";
DynamicUser = true;
StandardOutput = "null"; # nar-server logs multiple lines on every request
};
};
}