$ git clone -n https://src.fedoraproject.org/rpms/pythia8.git /var/lib/mock/f42-build-side-1-3503306-45980/root/chroot_tmpdir/scmroot/pythia8
Cloning into '/var/lib/mock/f42-build-side-1-3503306-45980/root/chroot_tmpdir/scmroot/pythia8'...
$ git fetch origin d761c9fbae604681033a7d76c5f9a0ab04646ddc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pythia8
 * [new ref]         d761c9fbae604681033a7d76c5f9a0ab04646ddc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d761c9f Update to version 8.3.14