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-rw-r--r--src/libstore/store-api.hh4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/libstore/store-api.hh b/src/libstore/store-api.hh
index bf3269f57818..0ab15c38063e 100644
--- a/src/libstore/store-api.hh
+++ b/src/libstore/store-api.hh
@@ -139,6 +139,10 @@ public:
 
     /* Query the output names of the derivation denoted by `path'. */
     virtual StringSet queryDerivationOutputNames(const Path & path) = 0;
+
+    /* Query the full store path given the hash part of a valid store
+       path, or "" if the path doesn't exist. */
+    virtual Path queryPathFromHashPart(const string & hashPart) = 0;
     
     /* Query whether a path has substitutes. */
     virtual bool hasSubstitutes(const Path & path) = 0;