Add some Rust code

src/nix/local.mk

@@ -15,9 +15,9 @@ nix_SOURCES := \
   $(wildcard src/nix-prefetch-url/*.cc) \
   $(wildcard src/nix-store/*.cc) \
 
-nix_LIBS = libexpr libmain libstore libutil
+nix_LIBS = libexpr libmain libstore libutil libnixrust
 
-nix_LDFLAGS = -pthread $(SODIUM_LIBS) $(EDITLINE_LIBS) $(BOOST_LDFLAGS) -lboost_context -lboost_thread -lboost_system
+nix_LDFLAGS = -pthread $(SODIUM_LIBS) $(EDITLINE_LIBS) $(BOOST_LDFLAGS) -lboost_context -lboost_thread -lboost_system -Lnix-rust/target/release
 
 $(foreach name, \
   nix-build nix-channel nix-collect-garbage nix-copy-closure nix-daemon nix-env nix-hash nix-instantiate nix-prefetch-url nix-shell nix-store, \

src/nix/test.cc

@@ -0,0 +1,61 @@
+#include "command.hh"
+#include "store-api.hh"
+#include "common-args.hh"
+
+using namespace nix;
+
+namespace rust {
+
+// Depending on the internal representation of Rust slices is slightly
+// evil...
+template<typename T> struct Slice
+{
+    const T * ptr;
+    size_t size;
+
+    Slice(const T * ptr, size_t size) : ptr(ptr), size(size)
+    {
+        assert(ptr);
+    }
+};
+
+struct StringSlice : Slice<char>
+{
+    StringSlice(const std::string & s): Slice(s.data(), s.size()) { }
+};
+
+}
+
+extern "C" {
+    bool unpack_tarfile(rust::Slice<uint8_t> data, rust::StringSlice dest_dir);
+}
+
+struct CmdTest : StoreCommand
+{
+    CmdTest()
+    {
+    }
+
+    std::string name() override
+    {
+        return "test";
+    }
+
+    std::string description() override
+    {
+        return "bla bla";
+    }
+
+    void run(ref<Store> store) override
+    {
+        auto data = readFile("./nix-2.2.tar");
+
+        std::string destDir = "./dest";
+
+        deletePath(destDir);
+
+        unpack_tarfile({(uint8_t*) data.data(), data.size()}, destDir);
+    }
+};
+
+static RegisterCommand r(make_ref<CmdTest>());