#include "finally.hh"

    counter & bytesSent,

    for (auto & p : missing)
        bytesSent += destStore->queryPathInfo(p).narSize;

static void copyClosureFrom(ref<Store> destStore,
    FdSource & from, FdSink & to, const PathSet & paths, counter & bytesReceived,
    std::shared_ptr<FSAccessor> accessor)
{
    to << cmdExportPaths << 0 << paths;
    to.flush();
    destStore->importPaths(false, from, accessor);
    for (auto & p : paths)
        bytesReceived += destStore->queryPathInfo(p).narSize;
}

    Finally updateStats([&]() {
        bytesReceived += from.read;
        bytesSent += to.written;
    });

        copyClosureTo(destStore, from, to, inputs, bytesSent, true);

        copyClosureTo(destStore, from, to, inputs, true);

        copyClosureFrom(destStore, from, to, outputs, bytesReceived, result.accessor);

        to << cmdExportPaths << 0 << outputs;
        to.flush();
        destStore->importPaths(false, from, result.accessor);

#pragma once
/* A trivial class to run a function at the end of a scope. */
class Finally
{
private:
    std::function<void()> fun;
public:
    Finally(std::function<void()> fun) : fun(fun) { }
    ~Finally() { fun(); }
};