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-rw-r--r--src/libstore/derivations.cc7
1 files changed, 7 insertions, 0 deletions
diff --git a/src/libstore/derivations.cc b/src/libstore/derivations.cc
index 7dcf71d468df..f051f10bd018 100644
--- a/src/libstore/derivations.cc
+++ b/src/libstore/derivations.cc
@@ -390,4 +390,11 @@ Sink & operator << (Sink & out, const BasicDerivation & drv)
 }
 
 
+std::string hashPlaceholder(const std::string & outputName)
+{
+    // FIXME: memoize?
+    return "/" + printHash32(hashString(htSHA256, "nix-output:" + outputName));
+}
+
+
 }