Hydra builds broken

[Bernhard Voelker]

Hi hydra-users,

it seems the coreutils package has not been built on Hydra since June.
There is an "evaluation error":

https://hydra.nixos.org/jobset/gnu/coreutils-master#tabs-errors

----->8-------
Errors occurred at 2018-06-19 02:58:53.

command `nix-prefetch-git 
/var/lib/hydra/scm/git/ad8945e296a15d6e5136ad2daee8742ae425ad26c467579cc280cdba649ffc51
f7b25021001160429912f4a6927bb93b6fc5535a' failed with exit status 256 at
/nix/store/5qm0mk46zlyzlsyj6lch7w6vcwf4hwav-hydra-0.1.2544.b542b73ced7a1ef6bc8f83e2918672068ccbc52c/libexec/hydra/lib/Hydra/Helper/Nix.pm
line 428.
-----8<-------

Any idea what this means and how to get around this?

Thanks & have a nice day,
Berny