* Get derivation outputs from the database instead of the .drv file,

which requires more I/O.

src/libstore/local-store.hh

@@ -109,6 +109,8 @@ public:
        derivation that was actually used to produce `path', which may
        not exist anymore.) */
     PathSet queryValidDerivers(const Path & path);
+
+    PathSet queryDerivationOutputs(const Path & path);
     
     PathSet querySubstitutablePaths();
     
@@ -206,6 +208,7 @@ private:
     SQLiteStmt stmtHasPathFailed;
     SQLiteStmt stmtAddDerivationOutput;
     SQLiteStmt stmtQueryValidDerivers;
+    SQLiteStmt stmtQueryDerivationOutputs;
 
     int getSchema();