$ git clone -n https://src.fedoraproject.org/rpms/python-matplotlib.git /var/lib/mock/f39-build-1839825-41973/root/chroot_tmpdir/scmroot/python-matplotlib
Cloning into '/var/lib/mock/f39-build-1839825-41973/root/chroot_tmpdir/scmroot/python-matplotlib'...
$ git fetch origin 4836060bd01edb84f4a6aee23c97e1be1947bac5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-matplotlib
 * [new ref]         4836060bd01edb84f4a6aee23c97e1be1947bac5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4836060 Update to latest version (#2250372)