}
    /* Gather the inputs. */
    PathSet inputs({drvPath});
    for (auto & input : drv.inputDrvs) {
        Derivation drv2 = readDerivation(input.first);
        for (auto & name : input.second) {
            auto i = drv2.outputs.find(name);
            if (i != drv2.outputs.end()) inputs.insert(i->second.path);
        }

    copyClosureTo(store, from, to, PathSet({drvPath}));

    copyClosureTo(store, from, to, inputs);