1 files changed, 15 insertions, 3 deletions
diff --git a/src/libstore/misc.cc b/src/libstore/misc.cc
index 1c187535d..acd4e0929 100644
--- a/src/libstore/misc.cc
+++ b/src/libstore/misc.cc
@@ -86,9 +86,21 @@ void Store::computeFSClosure(const StorePath & startPath,
 std::optional<ContentAddress> getDerivationCA(const BasicDerivation & drv)
 {
     auto out = drv.outputs.find("out");
-    if (out != drv.outputs.end()) {
-        if (const auto * v = std::get_if<DerivationOutput::CAFixed>(&out->second.raw()))
-            return v->hash;
+    if (out == drv.outputs.end())
+        return std::nullopt;
+    if (auto dof = std::get_if<DerivationOutput::CAFixed>(&out->second)) {
+        return std::visit(overloaded {
+            [&](const TextInfo & ti) -> std::optional<ContentAddress> {
+                if (!ti.references.empty())
+                    return std::nullopt;
+                return static_cast<TextHash>(ti);
+            },
+            [&](const FixedOutputInfo & fi) -> std::optional<ContentAddress> {
+                if (!fi.references.empty())
+                    return std::nullopt;
+                return static_cast<FixedOutputHash>(fi);
+            },
+        }, dof->ca);
     }
     return std::nullopt;
 }