AlexanderAshitkin commented on code in PR #178:
URL: 
https://github.com/apache/maven-build-cache-extension/pull/178#discussion_r1738654358


##########
src/main/java/org/apache/maven/buildcache/CacheControllerImpl.java:
##########
@@ -892,6 +892,18 @@ private void restoreGeneratedSources(Artifact artifact, 
Path artifactFilePath, M
             Files.createDirectories(outputDir);
         }
         CacheUtils.unzip(artifactFilePath, outputDir);
+        OutputType outputType = 
OutputType.fromClassifier(artifact.getClassifier());
+        if (outputType != OutputType.GENERATED_SOURCE) {
+            return;
+        }
+        Path targetDir = Paths.get(project.getBuild().getDirectory());
+        if (outputDir.equals(targetDir.resolve("generated-sources"))

Review Comment:
   It's possible that there are multiple generated source roots attached at 
different levels. The best solution would be to add extra metadata to 
accurately track and restore all the source roots. Alternatively, it's possible 
to implement a convention-based restoration by matching the logic in 
`CacheControllerImpl#attachGeneratedSources` to restore all the sources 
associated with a `GENERATED_SOURCE` cache entry.



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