$ git clone -n https://src.fedoraproject.org/rpms/mcpp.git /var/lib/mock/f41-build-1211684-22574/root/chroot_tmpdir/scmroot/mcpp
Cloning into '/var/lib/mock/f41-build-1211684-22574/root/chroot_tmpdir/scmroot/mcpp'...
$ git fetch origin 5276c8793eff3792a288c8abd4345bdf18561006:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mcpp
 * [new ref]         5276c8793eff3792a288c8abd4345bdf18561006 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5276c87 Eliminate use of obsolete %patchN syntax (#2283636)