Add 'third_party/nix/' from commit 'be66c7a6b24e3c3c6157fd37b86c7203d14acf10'

git-subtree-dir: third_party/nix
git-subtree-mainline: cf8cd640c1
git-subtree-split: be66c7a6b24e3c3c6157fd37b86c7203d14acf10

third_party/nix/src/libstore/remote-fs-accessor.hh

@@ -0,0 +1,40 @@
+#pragma once
+
+#include "fs-accessor.hh"
+#include "ref.hh"
+#include "store-api.hh"
+
+namespace nix {
+
+class RemoteFSAccessor : public FSAccessor
+{
+    ref<Store> store;
+
+    std::map<Path, ref<FSAccessor>> nars;
+
+    Path cacheDir;
+
+    std::pair<ref<FSAccessor>, Path> fetch(const Path & path_);
+
+    friend class BinaryCacheStore;
+
+    Path makeCacheFile(const Path & storePath, const std::string & ext);
+
+    void addToCache(const Path & storePath, const std::string & nar,
+        ref<FSAccessor> narAccessor);
+
+public:
+
+    RemoteFSAccessor(ref<Store> store,
+        const /* FIXME: use std::optional */ Path & cacheDir = "");
+
+    Stat stat(const Path & path) override;
+
+    StringSet readDirectory(const Path & path) override;
+
+    std::string readFile(const Path & path) override;
+
+    std::string readLink(const Path & path) override;
+};
+
+}