Add "nix copy" command
This replaces nix-push. For example, $ nix copy --to file:///tmp/cache -r $(type -p firefox) copies the closure of firefox to the specified binary cache. And $ nix copy --from file:///tmp/cache --to s3://my-cache /nix/store/abcd... copies between two binary caches. It will also replace nix-copy-closure, once we have an SSHStore class, e.g. $ nix copy --from ssh://alice@machine /nix/store/abcd...
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#include "command.hh"
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#include "progress-bar.hh"
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#include "shared.hh"
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#include "store-api.hh"
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#include "sync.hh"
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#include <atomic>
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using namespace nix;
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struct CmdCopy : StorePathsCommand
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{
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    std::string srcUri, dstUri;
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    CmdCopy()
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    {
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        mkFlag(0, "from", "store-uri", "URI of the source Nix store", &srcUri);
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        mkFlag(0, "to", "store-uri", "URI of the destination Nix store", &dstUri);
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    }
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    std::string name() override
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    {
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        return "copy";
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    }
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    std::string description() override
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    {
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        return "copy paths between Nix stores";
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    }
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    Examples examples() override
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    {
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        return {
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            Example{
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                "To copy Firefox to the local store to a binary cache in file:///tmp/cache:",
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                "nix copy --to file:///tmp/cache -r $(type -p firefox)"
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            },
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        };
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    }
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    void run(ref<Store> store, Paths storePaths) override
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    {
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        if (srcUri.empty() && dstUri.empty())
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            throw UsageError("you must pass ‘--from’ and/or ‘--to’");
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        ref<Store> srcStore = srcUri.empty() ? store : openStoreAt(srcUri);
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        ref<Store> dstStore = dstUri.empty() ? store : openStoreAt(dstUri);
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        ProgressBar progressBar;
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        std::atomic<size_t> done{0};
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        std::atomic<size_t> total{storePaths.size()};
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        auto showProgress = [&]() {
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            return (format("[%d/%d copied]") % done % total).str();
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        };
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        progressBar.updateStatus(showProgress());
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        storePaths.reverse(); // FIXME: assumes reverse topo sort
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        for (auto & storePath : storePaths) {
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            checkInterrupt();
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            if (dstStore->isValidPath(storePath)) {
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                total--;
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                progressBar.updateStatus(showProgress());
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                continue;
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            }
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            auto activity(progressBar.startActivity(format("copying ‘%s’...") % storePath));
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            StringSink sink;
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            srcStore->exportPaths({storePath}, false, sink);
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            StringSource source(*sink.s);
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            dstStore->importPaths(false, source, 0);
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            done++;
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            progressBar.updateStatus(showProgress());
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        }
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        progressBar.done();
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    }
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};
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static RegisterCommand r1(make_ref<CmdCopy>());
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