$ git clone -n https://src.fedoraproject.org/rpms/nemo-extensions.git /var/lib/mock/f40-build-1926118-25107/root/chroot_tmpdir/scmroot/nemo-extensions
Cloning into '/var/lib/mock/f40-build-1926118-25107/root/chroot_tmpdir/scmroot/nemo-extensions'...
$ git fetch origin e74458b23e7cc2b0c2f7e077921e6aed9cecc4bf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nemo-extensions
 * [new ref]         e74458b23e7cc2b0c2f7e077921e6aed9cecc4bf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e74458b fix