$ git clone -n https://src.fedoraproject.org/rpms/perl-DBIx-Class-OptimisticLocking.git /var/lib/mock/f41-build-side-1-2931576-35142/root/chroot_tmpdir/scmroot/perl-DBIx-Class-OptimisticLocking
Cloning into '/var/lib/mock/f41-build-side-1-2931576-35142/root/chroot_tmpdir/scmroot/perl-DBIx-Class-OptimisticLocking'...
$ git fetch origin cf4c873e2369bcd6418b4c5d902714319fe5a91b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-DBIx-Class-OptimisticLocking
 * [new ref]         cf4c873e2369bcd6418b4c5d902714319fe5a91b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cf4c873 convert GPL+ or Artistic license to SPDX