$ git clone -n https://src.fedoraproject.org/rpms/systemtap.git /var/lib/mock/f40-build-786794-134617/root/chroot_tmpdir/scmroot/systemtap
Cloning into '/var/lib/mock/f40-build-786794-134617/root/chroot_tmpdir/scmroot/systemtap'...
$ git fetch origin 756feba0634b0ee630a437a8490f9722debd4b18:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/systemtap
 * [new ref]         756feba0634b0ee630a437a8490f9722debd4b18 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 756feba Automated weekly systemtap rawhide release: 5.1~pre17062192g5fd8daba