third_party/nix/src/nix/dump-path.cc


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#include "libstore/store-api.hh"
#include "nix/command.hh"

using namespace nix;

struct CmdDumpPath final : StorePathCommand {
  std::string name() override { return "dump-path"; }

  std::string description() override {
    return "dump a store path to stdout (in NAR format)";
  }

  Examples examples() override {
    return {
        Example{"To get a NAR from the binary cache https://cache.nixos.org/:",
                "nix dump-path --store https://cache.nixos.org/ "
                "/nix/store/7crrmih8c52r8fbnqb933dxrsp44md93-glibc-2.25"},
    };
  }

  void run(ref<Store> store, const Path& storePath) override {
    FdSink sink(STDOUT_FILENO);
    store->narFromPath(storePath, sink);
    sink.flush();
  }
};

static RegisterCommand r1(make_ref<CmdDumpPath>());