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diff --git a/src/libstore/fs-accessor.hh b/src/libstore/fs-accessor.hh
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+#pragma once
+
+#include "types.hh"
+
+namespace nix {
+
+/* An abstract class for accessing a filesystem-like structure, such
+   as a (possibly remote) Nix store or the contents of a NAR file. */
+class FSAccessor
+{
+public:
+    enum Type { tMissing, tRegular, tSymlink, tDirectory };
+
+    struct Stat
+    {
+        Type type;
+        uint64_t fileSize; // regular files only
+        bool isExecutable; // regular files only
+    };
+
+    virtual Stat stat(const Path & path) = 0;
+
+    virtual StringSet readDirectory(const Path & path) = 0;
+
+    virtual std::string readFile(const Path & path) = 0;
+
+    virtual std::string readLink(const Path & path) = 0;
+};
+
+}