$ git clone -n https://src.fedoraproject.org/rpms/python-unix-ar.git /var/lib/mock/f45-build-33517-670/root/chroot_tmpdir/scmroot/python-unix-ar
Cloning into '/var/lib/mock/f45-build-33517-670/root/chroot_tmpdir/scmroot/python-unix-ar'...
$ git fetch origin e6ec3defb31ae6698baddb544c3387bb7ae10cfe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-unix-ar
 * [new ref]         e6ec3defb31ae6698baddb544c3387bb7ae10cfe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e6ec3de Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild