$ git clone -n https://src.fedoraproject.org/rpms/pybind11.git /var/lib/mock/f40-build-735429-106388/root/chroot_tmpdir/scmroot/pybind11
Cloning into '/var/lib/mock/f40-build-735429-106388/root/chroot_tmpdir/scmroot/pybind11'...
$ git fetch origin 9a9939bec912d0b8867f50e649f4f26a75b075de:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pybind11
 * [new ref]         9a9939bec912d0b8867f50e649f4f26a75b075de -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9a9939b Update to 2.11.1