Enable aspect invocations to be matched by output filters.

Currently aspects have no tag, i.e., they don't get checked against output
filters at all. This changes aspects to have a tag of the same form as the
rule they are attached to (i.e., the label of the target).

Since the default output filters match on ^//package[:/], this should cover
most uses of the output filter, while still allowing for finer control for
those who crave it.

--
MOS_MIGRATED_REVID=133425215

1 files changed, 2 insertions, 2 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/skyframe/AspectFunction.java b/src/main/java/com/google/devtools/build/lib/skyframe/AspectFunction.java
index 4035242c4e..ba84c5b7fb 100644
--- a/src/main/java/com/google/devtools/build/lib/skyframe/AspectFunction.java
+++ b/src/main/java/com/google/devtools/build/lib/skyframe/AspectFunction.java
@@ -376,10 +376,10 @@ public final class AspectFunction implements SkyFunction {
         transitivePackages.build());
   }
 
-  @Nullable
   @Override
   public String extractTag(SkyKey skyKey) {
-    return null;
+    AspectKey aspectKey = (AspectKey) skyKey.argument();
+    return Label.print(aspectKey.getLabel());
   }
 
   /**