$ git clone -n https://src.fedoraproject.org/rpms/python-yarl.git /var/lib/mock/f41-build-813001-148479/root/chroot_tmpdir/scmroot/python-yarl
Cloning into '/var/lib/mock/f41-build-813001-148479/root/chroot_tmpdir/scmroot/python-yarl'...
$ git fetch origin 78c143f25d60d2eedb268ebec88740b2c4ba39c5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-yarl
 * [new ref]         78c143f25d60d2eedb268ebec88740b2c4ba39c5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 78c143f Update to 1.9.4 (RHBZ#2251098)