$ git clone -n https://src.fedoraproject.org/rpms/xrootd.git /var/lib/mock/f40-build-2310150-57402/root/chroot_tmpdir/scmroot/xrootd
Cloning into '/var/lib/mock/f40-build-2310150-57402/root/chroot_tmpdir/scmroot/xrootd'...
$ git fetch origin 2af0de9eaf91101e6d9917c67fbe51556363054a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xrootd
 * [new ref]         2af0de9eaf91101e6d9917c67fbe51556363054a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2af0de9 Update to version 5.6.5