$ git clone -n https://src.fedoraproject.org/rpms/python-pycxx.git /var/lib/mock/f45-build-32169-657/root/chroot_tmpdir/scmroot/python-pycxx
Cloning into '/var/lib/mock/f45-build-32169-657/root/chroot_tmpdir/scmroot/python-pycxx'...
$ git fetch origin 44381942f812fd01804e6452bed7ee281d7f853c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-pycxx
 * [new ref]         44381942f812fd01804e6452bed7ee281d7f853c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4438194 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild