$ git clone -n https://src.fedoraproject.org/rpms/nnn.git /var/lib/mock/f41-build-side-1-3131195-39611/root/chroot_tmpdir/scmroot/nnn
Cloning into '/var/lib/mock/f41-build-side-1-3131195-39611/root/chroot_tmpdir/scmroot/nnn'...
$ git fetch origin e8a38cd8103c728813c60df42bb73208aa36b279:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nnn
 * [new ref]         e8a38cd8103c728813c60df42bb73208aa36b279 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e8a38cd Update to 4.9 (#2309500)