Move writeStructuredAttrsShell out of ParsedDerivation class

src/libstore/build/local-derivation-goal.cc

@@ -1088,7 +1088,7 @@ void LocalDerivationGoal::writeStructuredAttrs()
 {
     if (auto structAttrsJson = parsedDrv->prepareStructuredAttrs(inputRewrites, worker.store, inputPaths)) {
         auto json = structAttrsJson.value();
-        auto jsonSh = parsedDrv->writeStructuredAttrsShell(json);
+        auto jsonSh = writeStructuredAttrsShell(json);
 
         writeFile(tmpDir + "/.attrs.sh", rewriteStrings(jsonSh, inputRewrites));
         chownToBuilder(tmpDir + "/.attrs.sh");

src/libstore/parsed-derivations.cc

@@ -165,13 +165,13 @@ std::optional<nlohmann::json> ParsedDerivation::prepareStructuredAttrs(std::opti
     return json;
 }
 
-std::string ParsedDerivation::writeStructuredAttrsShell(nlohmann::json & json)
-{
 /* As a convenience to bash scripts, write a shell file that
    maps all attributes that are representable in bash -
    namely, strings, integers, nulls, Booleans, and arrays and
    objects consisting entirely of those values. (So nested
    arrays or objects are not supported.) */
+std::string writeStructuredAttrsShell(nlohmann::json & json)
+{
 
     auto handleSimpleType = [](const nlohmann::json & value) -> std::optional<std::string> {
         if (value.is_string())

src/libstore/parsed-derivations.hh

@@ -38,7 +38,8 @@ public:
     bool substitutesAllowed() const;
 
     std::optional<nlohmann::json> prepareStructuredAttrs(std::optional<StringMap> inputRewrites, Store & store, const StorePathSet & inputPaths);
-    std::string writeStructuredAttrsShell(nlohmann::json & json);
 };
 
+std::string writeStructuredAttrsShell(nlohmann::json & json);
+
 }

src/libstore/store-api.hh

@@ -695,6 +695,9 @@ public:
 
     const Stats & getStats();
 
+    /* Computes the full closure of of a set of store-paths for e.g.
+       derivations that need this information for `exportReferencesGraph`.
+     */
     StorePathSet exportReferences(const StorePathSet & storePaths, const StorePathSet & inputPaths);
 
     /* Return the build log of the specified store path, if available,

src/nix-build/nix-build.cc

@@ -446,7 +446,7 @@ static void main_nix_build(int argc, char * * argv)
 
             if (auto structAttrs = parsedDrv.prepareStructuredAttrs(std::nullopt, *store, inputs)) {
                 auto json = structAttrs.value();
-                structuredAttrsRC = parsedDrv.writeStructuredAttrsShell(json);
+                structuredAttrsRC = writeStructuredAttrsShell(json);
 
                 auto attrsJSON = (Path) tmpDir + "/.attrs.json";
                 writeFile(attrsJSON, json.dump());