$ git clone -n https://src.fedoraproject.org/rpms/systemtap.git /var/lib/mock/f41-build-815400-149446/root/chroot_tmpdir/scmroot/systemtap
Cloning into '/var/lib/mock/f41-build-815400-149446/root/chroot_tmpdir/scmroot/systemtap'...
$ git fetch origin 8c07a00957bc57e2cb33eea925ae2aacc42dd3a4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/systemtap
 * [new ref]         8c07a00957bc57e2cb33eea925ae2aacc42dd3a4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8c07a00 Automated weekly systemtap rawhide release: 5.2~pre17206355g1a07290a