80 lines
2.8 KiB
Nix
80 lines
2.8 KiB
Nix
# speed up builds from e.g. moby or lappy by having them query desko and servo first.
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# if one of these hosts is offline, instead manually specify just cachix:
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# - `nixos-rebuild --option substituters https://cache.nixos.org/`
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#
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# future improvements:
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# - apply for community arm build box:
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# - <https://github.com/nix-community/aarch64-build-box>
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# - don't require all substituters to be online:
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# - <https://github.com/NixOS/nix/pull/7188>
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{ lib, config, ... }:
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with lib;
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let
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cfg = config.sane.nixcache;
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hostName = config.networking.hostName;
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in
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{
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options = {
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sane.nixcache.enable = mkOption {
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default = false;
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type = types.bool;
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};
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sane.nixcache.enable-trusted-keys = mkOption {
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default = config.sane.nixcache.enable;
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type = types.bool;
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};
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sane.nixcache.substituters = let
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subOpt = mkOption {
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default = true;
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type = types.bool;
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};
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in {
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servo = subOpt;
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desko = subOpt;
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nixos = subOpt;
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cachix = subOpt;
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};
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sane.nixcache.remote-builders.desko = mkOption {
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default = true;
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type = types.bool;
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};
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};
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config = {
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# use our own binary cache
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# to explicitly build from a specific cache (in case others are down):
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# - `nixos-rebuild ... --option substituters https://cache.nixos.org`
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# - `nix build ... --substituters http://desko:5000`
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nix.settings.substituters = mkIf cfg.enable (lib.flatten [
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(lib.optional cfg.substituters.servo "https://nixcache.uninsane.org")
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(lib.optional cfg.substituters.desko "http://desko:${builtins.toString config.sane.services.nixserve.port}")
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(lib.optional cfg.substituters.nixos "https://cache.nixos.org/")
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(lib.optional cfg.substituters.cachix "https://nix-community.cachix.org")
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]);
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# always trust our keys (so one can explicitly use a substituter even if it's not the default
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nix.settings.trusted-public-keys = mkIf cfg.enable-trusted-keys [
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"nixcache.uninsane.org:r3WILM6+QrkmsLgqVQcEdibFD7Q/4gyzD9dGT33GP70="
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"desko:Q7mjjqoBMgNQ5P0e63sLur65A+D4f3Sv4QiycDIKxiI="
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"nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
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];
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nix.buildMachines = lib.mkIf cfg.remote-builders.desko [{
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hostName = "desko";
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system = "x86_64-linux";
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protocol = "ssh-ng";
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maxJobs = 4; # constrained by ram, for things like webkitgtk, etc.
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speedFactor = 8;
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supportedFeatures = [ "big-parallel" ];
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mandatoryFeatures = [ ];
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# TODO: define sshUser and sshKey here instead of in hosts/common/users/root.nix
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}];
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nix.distributedBuilds = lib.mkIf cfg.remote-builders.desko true;
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# optional, useful when the builder has a faster internet connection than yours
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nix.extraOptions = lib.mkIf cfg.remote-builders.desko ''
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builders-use-substitutes = true
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'';
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};
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}
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