$ git clone -n https://src.fedoraproject.org/rpms/bes.git /var/lib/mock/f40-build-2164608-50972/root/chroot_tmpdir/scmroot/bes
Cloning into '/var/lib/mock/f40-build-2164608-50972/root/chroot_tmpdir/scmroot/bes'...
$ git fetch origin 27fb0cee74e575c0b7fe7770fbac92cd476257d0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bes
 * [new ref]         27fb0cee74e575c0b7fe7770fbac92cd476257d0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 27fb0ce Rebuild (gdal)