82 lines
2.4 KiB
Nix
82 lines
2.4 KiB
Nix
# docs: <https://nixos.wiki/wiki/Binary_Cache>
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# to copy something to this machine's nix cache, do:
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# nix copy --to ssh://nixcache.uninsane.org PACKAGE
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#
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# docs: <https://nixos.wiki/wiki/Distributed_build>
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# to use this machine as a remote builder, just build anything with `-j0`.
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{ config, lib, ... }:
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with lib;
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let
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cfg = config.sane.services.nixserve;
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in
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{
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options = {
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sane.services.nixserve.enable = mkOption {
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default = false;
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type = types.bool;
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};
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sane.services.nixserve.port = mkOption {
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default = 5001;
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type = types.port;
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};
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sane.services.nixserve.secretKeyFile = mkOption {
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type = types.path;
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description = "path to file that contains the nix_serve_privkey secret (should not be in the store)";
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};
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sane.services.nixserve.remoteBuilderPubkey = mkOption {
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type = types.str;
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};
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};
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config = mkIf cfg.enable {
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# act as a substituter
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sane.ports.ports."${builtins.toString cfg.port}" = {
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visibleTo.lan = true; # not needed for servo; only desko
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protocol = [ "tcp" ];
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description = "colin-nix-serve-cache";
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};
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services.nix-serve = {
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enable = true;
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inherit (cfg) port secretKeyFile;
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};
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# XXX(2024/01/19): upstream service specifies `User=nix-serve`, `Group=nix-serve` but doesn't define the users.
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# this causes a coredump loop from within a nix-serve subprocess.
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users.users.nix-serve = {
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group = "nix-serve";
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isSystemUser = true;
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};
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users.groups.nix-serve = {};
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# act as a remote builder
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nix.settings.trusted-users = [ "nixremote" ];
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users.users.nixremote = {
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isNormalUser = true;
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home = "/home/nixremote";
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# remove write permissions everywhere in the home dir.
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# combined with an ownership of root:nixremote, that means not even nixremote can write anything below this directory
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# (in which case, i'm not actually sure why nixremote needs a home)
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homeMode = "550";
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group = "nixremote";
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subUidRanges = [
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{ startUid=300000; count=1; }
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];
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initialPassword = "";
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openssh.authorizedKeys.keys = [
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cfg.remoteBuilderPubkey
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];
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};
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users.groups.nixremote = {};
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sane.users.nixremote = {
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fs."/".dir.acl = {
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# don't allow the user to write anywhere
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user = "root";
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group = "nixremote";
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};
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};
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};
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}
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