$ git clone -n https://src.fedoraproject.org/rpms/gbrainy.git /var/lib/mock/f41-build-side-1-2951866-35498/root/chroot_tmpdir/scmroot/gbrainy
Cloning into '/var/lib/mock/f41-build-side-1-2951866-35498/root/chroot_tmpdir/scmroot/gbrainy'...
$ git fetch origin d2046430174f01f68a44c435917c3cf2d69916ec:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gbrainy
 * [new ref]         d2046430174f01f68a44c435917c3cf2d69916ec -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d204643 convert GPLv2 license to SPDX