Can someone check if https://github.com/NixOS/infra/blob/master/modules/tarball-mirror.nix is working?

Locally I'm getting

$ NIX_PATH=nixpkgs=. ./maintainers/scripts/copy-tarballs.pl --dry-run --debug \
  --expr 'import <nixpkgs/maintainers/scripts/all-tarballs.nix>' \
  --exclude 'registry.npmjs.org|mirror://kde|mirror://xorg|mirror://kernel|mirror://hackage|mirror://gnome|mirror://apache|mirror://mozilla|pypi.python.org'

Undefined subroutine &main::isValidPath called at ./maintainers/scripts/copy-tarballs.pl line 25.
fileparse(): need a valid pathname at ./maintainers/scripts/copy-tarballs.pl line 77.
END failed--call queue aborted.

The service seems to be working as usual, at a glance.

Oct 18 05:43:17 pluto mirror-tarballs-start[3020740]: mirrored 19 files, already have 18597 files

In reply to@k900:0upti.me
I'd appreciate a review on https://github.com/NixOS/nixpkgs/pull/349701 so maybe we can actually figure out why

  nix.gc.options = ''--max-freed "$((400 * 1024**3 - 1024 * $(df -P -k /nix/store | tail -n 1 | ${pkgs.gawk}/bin/awk '{ print $4 }')))"'';

GC is only partial because we still have

error: store path 'q7375xm60a582561sq84mxyx13j79cjb-.version' starts with illegal character '.'