From e96b0b88a5f9aa8cd816e3603b9179f040d79270 Mon Sep 17 00:00:00 2001
From: Florian Weikert <fwe@google.com>
Date: Fri, 25 Sep 2015 11:35:11 +0000
Subject: Skylark rules can no longer overwrite built-in attributes.

--
MOS_MIGRATED_REVID=103931317
---
 .../build/lib/rules/SkylarkRuleClassFunctions.java         | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

(limited to 'src/main/java/com/google/devtools/build/lib/rules')

diff --git a/src/main/java/com/google/devtools/build/lib/rules/SkylarkRuleClassFunctions.java b/src/main/java/com/google/devtools/build/lib/rules/SkylarkRuleClassFunctions.java
index f2a3733b16..88f61ec942 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/SkylarkRuleClassFunctions.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/SkylarkRuleClassFunctions.java
@@ -264,11 +264,12 @@ public class SkylarkRuleClassFunctions {
           Attribute.Builder<?> attrBuilder = (Attribute.Builder<?>) attr.getValue();
           String attrName =
               attributeToNative(attr.getKey(), ast.getLocation(), attrBuilder.hasLateBoundValue());
-          builder.addOrOverrideAttribute(attrBuilder.build(attrName));
+          addAttribute(builder, attrBuilder.build(attrName));
         }
       }
       if (executable || test) {
-        builder.addOrOverrideAttribute(
+        addAttribute(
+            builder,
             attr("$is_executable", BOOLEAN)
                 .value(true)
                 .nonconfigurable("Called from RunCommand.isExecutable, which takes a Target")
@@ -297,12 +298,19 @@ public class SkylarkRuleClassFunctions {
       }
 
       registerRequiredFragments(fragments, hostFragments, builder);
-
       builder.setConfiguredTargetFunction(implementation);
       builder.setRuleDefinitionEnvironment(funcallEnv);
       return new RuleFunction(builder, type);
     }
 
+    private void addAttribute(RuleClass.Builder builder, Attribute attribute) throws EvalException {
+      try {
+        builder.addOrOverrideAttribute(attribute);
+      } catch (IllegalArgumentException ex) {
+        throw new EvalException(location, ex);
+      }
+    }
+
     private void registerRequiredFragments(
         SkylarkList fragments, SkylarkList hostFragments, RuleClass.Builder builder) {
       Map<ConfigurationTransition, ImmutableSet<String>> map = new HashMap<>();
-- 
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