$ git clone -n https://src.fedoraproject.org/rpms/systemtap.git /var/lib/mock/f40-build-735089-106198/root/chroot_tmpdir/scmroot/systemtap
Cloning into '/var/lib/mock/f40-build-735089-106198/root/chroot_tmpdir/scmroot/systemtap'...
$ git fetch origin b7cac72f196f1b5ac290e43df1d132277fb21163:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/systemtap
 * [new ref]         b7cac72f196f1b5ac290e43df1d132277fb21163 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b7cac72 Automated weekly systemtap rawhide release: 5.0~pre16958465gca71442b