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-rw-r--r--src/libstore/store-api.hh7
1 files changed, 7 insertions, 0 deletions
diff --git a/src/libstore/store-api.hh b/src/libstore/store-api.hh
index d4997c886207..61bcaf50507f 100644
--- a/src/libstore/store-api.hh
+++ b/src/libstore/store-api.hh
@@ -140,6 +140,9 @@ public:
 
     /* Query the outputs of the derivation denoted by `path'. */
     virtual PathSet queryDerivationOutputs(const Path & path) = 0;
+
+    /* Query the output names of the derivation denoted by `path'. */
+    virtual StringSet queryDerivationOutputNames(const Path & path) = 0;
     
     /* Query whether a path has substitutes. */
     virtual bool hasSubstitutes(const Path & path) = 0;
@@ -346,6 +349,10 @@ void exportPaths(StoreAPI & store, const Paths & paths,
     bool sign, Sink & sink);
 
 
+MakeError(SubstError, Error)
+MakeError(BuildError, Error) /* denotes a permanent build failure */
+
+
 }