Add --incompatible_remove_exec_tools to control whether genrule has an exec_tools attribute.

Part of #19132.

PiperOrigin-RevId: 552496824
Change-Id: I2a09c390da89a44506afae55319aa393ed292c62

Author: katre

src/main/java/com/google/devtools/build/lib/bazel/BazelConfiguration.java

@@ -40,10 +40,20 @@ public static class Options extends FragmentOptions {
         help = "If enabled, visibility checking also applies to toolchain implementations.")
     public boolean checkVisibilityForToolchains;
 
+    @Option(
+        name = "incompatible_remove_exec_tools",
+        defaultValue = "false",
+        documentationCategory = OptionDocumentationCategory.UNCATEGORIZED,
+        effectTags = {OptionEffectTag.BUILD_FILE_SEMANTICS},
+        metadataTags = {OptionMetadataTag.INCOMPATIBLE_CHANGE},
+        help = "If enabled, use of genrule's exec_tools attribute will cause an error..")
+    public boolean removeExecTools;
+
     @Override
     public FragmentOptions getExec() {
       Options exec = (Options) getDefault();
       exec.checkVisibilityForToolchains = checkVisibilityForToolchains;
+      exec.removeExecTools = removeExecTools;
 
       return exec;
     }

src/main/java/com/google/devtools/build/lib/bazel/rules/genrule/BUILD

@@ -18,6 +18,7 @@ java_library(
         "//src/main/java/com/google/devtools/build/lib/analysis:analysis_cluster",
         "//src/main/java/com/google/devtools/build/lib/analysis:config/execution_transition_factory",
         "//src/main/java/com/google/devtools/build/lib/analysis:rule_definition_environment",
+        "//src/main/java/com/google/devtools/build/lib/bazel:bazel_configuration",
         "//src/main/java/com/google/devtools/build/lib/packages",
         "//src/main/java/com/google/devtools/build/lib/rules/genrule",
         "//src/main/java/com/google/devtools/build/lib/util:filetype",

src/main/java/com/google/devtools/build/lib/bazel/rules/genrule/BazelGenRule.java

@@ -16,6 +16,8 @@
 
 import com.google.devtools.build.lib.analysis.CommandHelper;
 import com.google.devtools.build.lib.analysis.RuleContext;
+import com.google.devtools.build.lib.bazel.BazelConfiguration;
+import com.google.devtools.build.lib.packages.BuildType;
 import com.google.devtools.build.lib.packages.Type;
 import com.google.devtools.build.lib.rules.genrule.GenRuleBase;
 
@@ -36,9 +38,18 @@ protected boolean isStampingEnabled(RuleContext ruleContext) {
   // projects are migrated.
   @Override
   protected CommandHelper.Builder commandHelperBuilder(RuleContext ruleContext) {
+    BazelConfiguration.Options bazelOptions =
+        ruleContext.getConfiguration().getOptions().get(BazelConfiguration.Options.class);
+
+    if (bazelOptions.removeExecTools
+        && ruleContext.attributes().has("exec_tools", BuildType.LABEL_LIST)
+        && !ruleContext.attributes().get("exec_tools", BuildType.LABEL_LIST).isEmpty()) {
+      ruleContext.attributeError(
+          "exec_tools", "genrule.exec_tools has been removed, use tools instead");
+    }
+
     return CommandHelper.builder(ruleContext)
         .addToolDependencies("tools")
-        // TODO(https://github.com/bazelbuild/bazel/issues/19132): Add an actual incompatible flag.
         .addToolDependencies("exec_tools")
         .addToolDependencies("toolchains");
   }