$ git clone -n https://src.fedoraproject.org/rpms/HepMC3.git /var/lib/mock/f33-build-274217-51618/root/chroot_tmpdir/scmroot/HepMC3
Cloning into '/var/lib/mock/f33-build-274217-51618/root/chroot_tmpdir/scmroot/HepMC3'...
$ git reset --hard 3f1a40a83f282b34100d8e82923dd062a778ae79
HEAD is now at 3f1a40a Rebuilt for Python 3.9