so I have an issue with users.users / users.knownUsers on nix-darwin; I'm trying to have nix-darwin create a user, but (after a bunch of swearing & reading the activate script in the built system closure) it seems to expect that the user needs to be deleted? here's what I configure, is there anything wrong with it?

  users.knownGroups = [ "ci-worker" ];
  users.knownUsers = [ "ci-worker" ];
  users.groups.ci-worker = {
    gid = 502;
  };
  users.users.ci-worker = {
    createHome = false;
    description = "Nix Build support user for remote builds from CI";
    home = "/var/empty";
    shell = pkgs.bashInteractive;
    name = "Nix Build CI Worker";
    uid = 502;
    gid = 502;
    openssh.authorizedKeys.keys = [
      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIGFg7XQg/ACCFIL0f2OJoU0EIcQFuwa3qz7pQNzmDe2W root@gloria"
    ];
  };

FAILED: bootstrapping1/SwiftCompilerSources/Basic.o /nix/var/nix/builds/nix-build-swiftc-6.2.1+bootstrap.drv-0/b/source/build/bootstrapping1/SwiftCompilerSources/Basic.o
cd /nix/var/nix/builds/nix-build-swiftc-6.2.1+bootstrap.drv-0/b/source/SwiftCompilerSources && /nix/var/nix/builds/nix-build-swiftc-6.2.1+bootstrap.drv-0/b/source/build/bootstrapping0/bin/swiftc -c -o /nix/var/nix/builds/nix-buil>
<unknown>:0: warning: using (deprecated) legacy driver, Swift installation does not contain swift-driver at: '/nix/var/nix/builds/nix-build-swiftc-6.2.1+bootstrap.drv-0/b/source/build/bootstrapping0/bin/swift-driver-new'
/nix/store/bj5iys7xm7ba8xxsc6hb9q6zv9x5igs2-apple-sdk-14.4/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.4.sdk/usr/lib/swift/Swift.swiftmodule/arm64e-apple-macos.swiftinterface:10062:3: error: missing return in instance metho>
10060 |     }
10061 |     while true
10062 |   }
      |   `- error: missing return in instance method expected to return 'FlattenSequence<Base>.Iterator.Element?' (aka 'Optional<Base.Element.Element>')
10063 | }
10064 | extension Swift.FlattenSequence.Iterator : Swift.Sequence {

I'm getting these, when trying to build dovecot after a nixpkgs upgrade:

ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[3]: *** [Makefile:651: libssl_iostream_openssl.la] Fehler 1
make[3]: *** Es wird auf noch nicht beendete Prozesse gewartet …
libtool: link: ar cr .libs/libssl_iostream.a .libs/iostream-ssl.o .libs/iostream-ssl-context-cache.o .libs/iostream-ssl-test.o
libtool: link: ranlib .libs/libssl_iostream.a
libtool: link: ( cd ".libs" && rm -f "libssl_iostream.la" && ln -s "../libssl_iostream.la" "libssl_iostream.la" )
make[3]: Verzeichnis „/nix/var/nix/builds/nix-build-dovecot-2.3.21.1.drv-0/b/dovecot-2.3.21.1/src/lib-ssl-iostream“ wird verlassen
make[2]: *** [Makefile:573: all-recursive] Fehler 1
make[2]: Verzeichnis „/nix/var/nix/builds/nix-build-dovecot-2.3.21.1.drv-0/b/dovecot-2.3.21.1/src“ wird verlassen
make[1]: *** [Makefile:704: all-recursive] Fehler 1
make[1]: Verzeichnis „/nix/var/nix/builds/nix-build-dovecot-2.3.21.1.drv-0/b/dovecot-2.3.21.1“ wird verlassen
make: *** [Makefile:548: all] Fehler 2

Package version hasn't been updated in ages. I can see that the SDK was updated. Last time it successfully build I was using apple-sdk-11.3 in stdenv. Now we are using apple -sdk-14.4. Could this be related?

/nix/store/7x3jpimm3qaffhdcgj23rd51gpmy4p2f-apple-sdk-26.0/Platforms/MacOSX.platform/Developer/SDKs/MacOSX26.0.sdk/usr/lib/swift/Swift.swiftmodule/arm64e-apple-macos.swiftinterface:34793:42: error: Using type 'Int' can cause metadata allocation or locks

34791 |
34792 |   let queryVersion = (Int(major), Int(minor), Int(patch))
34793 |   let major32 = Int32(truncatingIfNeeded:Int(queryVersion.0))
      |                                          `- error: Using type 'Int' can cause metadata allocation or locks
34794 |   let minor32 = Int32(truncatingIfNeeded:Int(queryVersion.1))
34795 |   let patch32 = Int32(truncatingIfNeeded:Int(queryVersion.2))