$ git clone -n https://src.fedoraproject.org/rpms/ghc-versions.git /var/lib/mock/f41-build-839614-160255/root/chroot_tmpdir/scmroot/ghc-versions
Cloning into '/var/lib/mock/f41-build-839614-160255/root/chroot_tmpdir/scmroot/ghc-versions'...
$ git fetch origin 92a536939e6d1fef76a0945a07eed81fbbe4dedd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-versions
 * [new ref]         92a536939e6d1fef76a0945a07eed81fbbe4dedd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 92a5369 disable tests on i686