$ git clone -n https://src.fedoraproject.org/rpms/systemtap.git /var/lib/mock/f41-build-844360-162501/root/chroot_tmpdir/scmroot/systemtap
Cloning into '/var/lib/mock/f41-build-844360-162501/root/chroot_tmpdir/scmroot/systemtap'...
$ git fetch origin 20b4dc7947b0a1197c48b0b26821ae698ba1902d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/systemtap
 * [new ref]         20b4dc7947b0a1197c48b0b26821ae698ba1902d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 20b4dc7 Final split of sdt-dtrace and sdt-devel (rhbz#2296275)