Add NAR / Store accessor abstraction

This is primary to allow hydra-queue-runner to extract files like
"nix-support/hydra-build-products" from NARs in binary caches.

1 files changed, 3 insertions, 2 deletions

diff --git a/src/libstore/binary-cache-store.hh b/src/libstore/binary-cache-store.hh
index 2235d6d67268..c6f319d1bc82 100644
--- a/src/libstore/binary-cache-store.hh
+++ b/src/libstore/binary-cache-store.hh
@@ -125,8 +125,7 @@ public:
     Path addTextToStore(const string & name, const string & s,
         const PathSet & references, bool repair = false) override;
 
-    void exportPath(const Path & path, bool sign,
-        Sink & sink) override;
+    void exportPath(const Path & path, bool sign, Sink & sink) override;
 
     Paths importPaths(bool requireSignature, Source & source) override;
 
@@ -167,6 +166,8 @@ public:
     bool verifyStore(bool checkContents, bool repair) override
     { return true; }
 
+    ref<FSAccessor> getFSAccessor() override;
+
 };
 
 }