103 lines
3 KiB
Nix
103 lines
3 KiB
Nix
{
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pkgs,
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lib,
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config,
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secret,
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...
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}:
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with lib;
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let
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cfg = config.module.builder;
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serverKeyPath = "/root/.nixbuilder";
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serverSshPublicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIFqr7zKGOy/2bbAQCD85Ol+NoGGtvdMbSy3jGb98jM+f"; # Use ssh-keyscan.
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in
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{
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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 public 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 public key to be present in secret.ssh.builderKeys.
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nix = {
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distributedBuilds = true;
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buildMachines = [
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{
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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 = 16;
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speedFactor = 2;
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mandatoryFeatures = [ ];
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supportedFeatures = [
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"nixos-test"
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"benchmark"
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"big-parallel"
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"kvm"
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];
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}
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];
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settings =
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let
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substituters = [ "ssh-ng://nixbuilder" ];
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in
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{
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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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services.openssh.knownHosts.nixbuilder = {
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publicKey = serverSshPublicKey;
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extraHostNames = [ "[10.0.0.1]:22143" ];
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};
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})
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];
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}
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