$ git clone -n https://src.fedoraproject.org/rpms/python-yara.git /var/lib/mock/f41-build-855866-167429/root/chroot_tmpdir/scmroot/python-yara
Cloning into '/var/lib/mock/f41-build-855866-167429/root/chroot_tmpdir/scmroot/python-yara'...
$ git fetch origin 89aacbc3bdfd5c4cb84973b00d9889d1ef64a7f3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-yara
 * [new ref]         89aacbc3bdfd5c4cb84973b00d9889d1ef64a7f3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 89aacbc rebuild with yara 4.5.2 (this time with override)