$ git clone -n https://src.fedoraproject.org/rpms/systemtap.git /var/lib/mock/f41-build-824478-154118/root/chroot_tmpdir/scmroot/systemtap
Cloning into '/var/lib/mock/f41-build-824478-154118/root/chroot_tmpdir/scmroot/systemtap'...
$ git fetch origin 93948388bc54cd7a4efb1806d9787291d26b33d6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/systemtap
 * [new ref]         93948388bc54cd7a4efb1806d9787291d26b33d6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9394838 New sdt-dtrace subpackage for dtrace tool (rhbz#2296275)