$ git clone -n https://src.fedoraproject.org/rpms/rocalution.git /var/lib/mock/f42-build-3530734-46321/root/chroot_tmpdir/scmroot/rocalution
Cloning into '/var/lib/mock/f42-build-3530734-46321/root/chroot_tmpdir/scmroot/rocalution'...
$ git fetch origin d7977d75f6afcc513dccf3cd21919f444c019f0c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rocalution
 * [new ref]         d7977d75f6afcc513dccf3cd21919f444c019f0c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d7977d7 Update to 6.4.0