$ git clone -n https://src.fedoraproject.org/rpms/HepMC3.git /var/lib/mock/f33-build-339456-58626/root/chroot_tmpdir/scmroot/HepMC3
Cloning into '/var/lib/mock/f33-build-339456-58626/root/chroot_tmpdir/scmroot/HepMC3'...
$ git reset --hard b252c9455be96d8f3f0bc4045307454cf2262409
HEAD is now at b252c94 - Rebuilt for https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild