$ git clone -n https://src.fedoraproject.org/rpms/xrootd.git /var/lib/mock/f41-build-814645-149004/root/chroot_tmpdir/scmroot/xrootd
Cloning into '/var/lib/mock/f41-build-814645-149004/root/chroot_tmpdir/scmroot/xrootd'...
$ git fetch origin b996dc7685ad43c5bfa5830ecf7e723c87fe31e5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xrootd
 * [new ref]         b996dc7685ad43c5bfa5830ecf7e723c87fe31e5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b996dc7 Fix compilation error due to hidden overloaded virtual