$ git clone -n https://src.fedoraproject.org/rpms/mingw-opencv.git /var/lib/mock/f40-build-2194904-51502/root/chroot_tmpdir/scmroot/mingw-opencv
Cloning into '/var/lib/mock/f40-build-2194904-51502/root/chroot_tmpdir/scmroot/mingw-opencv'...
$ git fetch origin d573b4583b7f7ffa341efb3d0f8389dfa17e3a84:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mingw-opencv
 * [new ref]         d573b4583b7f7ffa341efb3d0f8389dfa17e3a84 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d573b45 Rebuild (gdal)