$ git clone -n https://src.fedoraproject.org/rpms/xrootd.git /var/lib/mock/f41-build-side-1-2810827-32921/root/chroot_tmpdir/scmroot/xrootd
Cloning into '/var/lib/mock/f41-build-side-1-2810827-32921/root/chroot_tmpdir/scmroot/xrootd'...
$ git fetch origin e528e0f40da059e95afed97a2945233c0e02d743:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xrootd
 * [new ref]         e528e0f40da059e95afed97a2945233c0e02d743 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e528e0f Workaround doxygen non-reproducibility - make doc package noarch again