$ git clone -n https://src.fedoraproject.org/rpms/mingw-Cython.git /var/lib/mock/f45-build-18346-514/root/chroot_tmpdir/scmroot/mingw-Cython
Cloning into '/var/lib/mock/f45-build-18346-514/root/chroot_tmpdir/scmroot/mingw-Cython'...
$ git fetch origin 41345a54425c117ebcb24f2769b063c40786fa13:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mingw-Cython
 * [new ref]         41345a54425c117ebcb24f2769b063c40786fa13 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 41345a5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild