1 files changed, 28 insertions, 0 deletions
diff --git a/third_party/nix/src/nix/dump-path.cc b/third_party/nix/src/nix/dump-path.cc
new file mode 100644
index 000000000000..1d0a996e561c
--- /dev/null
+++ b/third_party/nix/src/nix/dump-path.cc
@@ -0,0 +1,28 @@
+#include "libstore/store-api.hh"
+#include "nix/command.hh"
+
+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();
+  }
+};
+}  // namespace nix
+
+static nix::RegisterCommand r1(nix::make_ref<nix::CmdDumpPath>());