Initial flake support

src/libexpr/primops/fetchGit.hh

@@ -0,0 +1,23 @@
+#pragma once
+
+#include "store-api.hh"
+
+#include <regex>
+
+namespace nix {
+
+struct GitInfo
+{
+    Path storePath;
+    std::string rev;
+    std::string shortRev;
+    uint64_t revCount = 0;
+};
+
+GitInfo exportGit(ref<Store> store, const std::string & uri,
+    std::experimental::optional<std::string> ref, std::string rev,
+    const std::string & name);
+
+extern std::regex revRegex;
+
+}