2 files changed, 7 insertions, 6 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/packages/Preprocessor.java b/src/main/java/com/google/devtools/build/lib/packages/Preprocessor.java
index 7a1f753678..787d09e0c5 100644
--- a/src/main/java/com/google/devtools/build/lib/packages/Preprocessor.java
+++ b/src/main/java/com/google/devtools/build/lib/packages/Preprocessor.java
@@ -39,10 +39,11 @@ public interface Preprocessor {
       /**
        * Returns a Preprocessor factory to use for getting Preprocessor instances.
        *
-       * <p>The CachingPackageLocator is provided so the constructed preprocessors can look up
-       * other BUILD files.
+       * @param loc a package locator for preprocessors to look up other BUILD files
+       * @param outputBase allows non-hermetic access to the file system and output base; use with
+       *        extreme caution
        */
-      Factory getFactory(CachingPackageLocator loc);
+      Factory getFactory(CachingPackageLocator loc, Path outputBase);
 
       /** Supplier that always returns {@code NullFactory.INSTANCE}. */
       static class NullSupplier implements Supplier {
@@ -53,7 +54,7 @@ public interface Preprocessor {
         }
 
         @Override
-        public Factory getFactory(CachingPackageLocator loc) {
+        public Factory getFactory(CachingPackageLocator loc, Path outputBase) {
           return NullFactory.INSTANCE;
         }
       }
diff --git a/src/main/java/com/google/devtools/build/lib/skyframe/SkyframeExecutor.java b/src/main/java/com/google/devtools/build/lib/skyframe/SkyframeExecutor.java
index 661a70a332..ffe4091ceb 100644
--- a/src/main/java/com/google/devtools/build/lib/skyframe/SkyframeExecutor.java
+++ b/src/main/java/com/google/devtools/build/lib/skyframe/SkyframeExecutor.java
@@ -949,12 +949,12 @@ public abstract class SkyframeExecutor implements WalkableGraphFactory {
   private void checkPreprocessorFactory() {
     if (preprocessorFactory == null) {
       Preprocessor.Factory newPreprocessorFactory = preprocessorFactorySupplier.getFactory(
-          packageManager);
+          packageManager, directories.getOutputBase());
       pkgFactory.setPreprocessorFactory(newPreprocessorFactory);
       preprocessorFactory = newPreprocessorFactory;
     } else if (!preprocessorFactory.isStillValid()) {
       Preprocessor.Factory newPreprocessorFactory = preprocessorFactorySupplier.getFactory(
-          packageManager);
+          packageManager, directories.getOutputBase());
       invalidate(SkyFunctionName.functionIs(SkyFunctions.PACKAGE));
       pkgFactory.setPreprocessorFactory(newPreprocessorFactory);
       preprocessorFactory = newPreprocessorFactory;