$ git clone -n https://src.fedoraproject.org/rpms/python-u-msgpack-python.git /var/lib/mock/f40-build-2204529-51963/root/chroot_tmpdir/scmroot/python-u-msgpack-python
Cloning into '/var/lib/mock/f40-build-2204529-51963/root/chroot_tmpdir/scmroot/python-u-msgpack-python'...
$ git fetch origin 00be1d0aca3c33215fc45cb19f2b9148995d9a54:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-u-msgpack-python
 * [new ref]         00be1d0aca3c33215fc45cb19f2b9148995d9a54 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 00be1d0 Update to 2.8.0