$ git clone -n https://src.fedoraproject.org/rpms/HepMC3.git /var/lib/mock/f38-build-side-42-init-devel-803787-28144/root/chroot_tmpdir/scmroot/HepMC3
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-803787-28144/root/chroot_tmpdir/scmroot/HepMC3'...
$ git fetch origin 9ffc73d4389444044e35082e2b8551efb0ad2766:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/HepMC3
 * [new ref]         9ffc73d4389444044e35082e2b8551efb0ad2766 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9ffc73d Rebuild for root 6.28 Fix Python 3.12 build