80 lines
2.3 KiB
Nix
80 lines
2.3 KiB
Nix
# Module that enables remote builds. This is a client configuration.
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{ pkgs, lib, config, secret, ... }: with lib; let
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cfg = config.module.builder;
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serverKeyPath = "/root/.nixbuilder";
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in {
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options = {
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module.builder = {
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server.enable = mkEnableOption "This is a builder server.";
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client.enable = mkEnableOption "This is a builder client.";
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};
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};
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config = mkMerge [
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(mkIf cfg.server.enable {
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# Service that generates new key on boot if not present.
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# Don't forget to add new key to secret.ssh.buildKeys.
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systemd.services.generate-nix-cache-key = {
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wantedBy = [ "multi-user.target" ];
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serviceConfig.Type = "oneshot";
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path = [ pkgs.nix ];
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script = ''
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[[ -f "${serverKeyPath}/private-key" ]] && exit
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mkdir ${serverKeyPath} || true
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nix-store --generate-binary-cache-key "nixbuilder-1" "${serverKeyPath}/private-key" "${serverKeyPath}/public-key"
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nix store sign --all -k "${serverKeyPath}/private-key"
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'';
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};
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# Add `nixbuilder` restricted user.
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users.groups.nixbuilder = {};
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users.users.nixbuilder = {
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openssh.authorizedKeys.keys = secret.ssh.buildKeys;
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description = "Nix Remote Builder";
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isNormalUser = true;
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createHome = lib.mkForce false;
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uid = 1234;
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home = "/";
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group = "nixbuilder";
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};
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# Sign store automatically.
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# Sign existing store with: nix store sign --all -k /path/to/secret-key-file
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nix.settings = {
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trusted-users = [ "nixbuilder" ];
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secret-key-files = [ "${serverKeyPath}/private-key" ];
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};
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})
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(mkIf cfg.client.enable {
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# NOTE: Requires host private key to be present in secret.ssh.builderKeys.
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nix.buildMachines = [{
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hostName = "nixbuilder";
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protocol = "ssh-ng";
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systems = [
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"x86_64-linux"
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"i686-linux"
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"aarch64-linux"
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];
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maxJobs = 1;
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speedFactor = 2;
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mandatoryFeatures = [ ];
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supportedFeatures = [ "nixos-test" "benchmark" "big-parallel" "kvm" ];
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}];
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nix.distributedBuilds = true;
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nix.settings = let
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substituters = [ "ssh-ng://nixbuilder" ];
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in {
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substituters = mkForce substituters;
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trusted-substituters = substituters ++ [ "https://cache.nixos.org/" ];
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builders-use-substitutes = true;
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max-jobs = 0;
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trusted-public-keys = [ secret.ssh.builderKey ];
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# require-sigs = false;
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# substitute = false;
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};
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})
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];
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}
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