Create a Bootstrap for config-related libraries of skylarkbuildapi.

RELNOTES: None.
PiperOrigin-RevId: 198906931

src/main/java/com/google/devtools/build/lib/analysis/ConfiguredRuleClassProvider.java

@@ -56,6 +56,7 @@
 import com.google.devtools.build.lib.packages.Target;
 import com.google.devtools.build.lib.runtime.proto.InvocationPolicyOuterClass.InvocationPolicy;
 import com.google.devtools.build.lib.skyframe.ConfiguredTargetAndData;
+import com.google.devtools.build.lib.skylarkbuildapi.Bootstrap;
 import com.google.devtools.build.lib.skylarkinterface.SkylarkInterfaceUtils;
 import com.google.devtools.build.lib.skylarkinterface.SkylarkModule;
 import com.google.devtools.build.lib.syntax.Environment;
@@ -238,6 +239,8 @@ public static class Builder implements RuleDefinitionEnvironment {
         new ArrayList<>();
     @Nullable private RuleTransitionFactory trimmingTransitionFactory;
     private PrerequisiteValidator prerequisiteValidator;
+    private ImmutableList.Builder<Bootstrap> skylarkBootstraps =
+        ImmutableList.<Bootstrap>builder();
     private ImmutableMap.Builder<String, Object> skylarkAccessibleTopLevels =
         ImmutableMap.builder();
      private ImmutableList.Builder<Class<?>> skylarkModules =
@@ -358,6 +361,11 @@ public Builder addUniversalConfigurationFragment(
       return this;
     }
 
+    public Builder addSkylarkBootstrap(Bootstrap bootstrap) {
+      this.skylarkBootstraps.add(bootstrap);
+      return this;
+    }
+
     public Builder addSkylarkAccessibleTopLevels(String name, Object object) {
       this.skylarkAccessibleTopLevels.put(name, object);
       return this;
@@ -514,6 +522,7 @@ public ConfiguredRuleClassProvider build() {
           trimmingTransitionFactory,
           prerequisiteValidator,
           skylarkAccessibleTopLevels.build(),
+          skylarkBootstraps.build(),
           skylarkModules.build(),
           ImmutableSet.copyOf(reservedActionMnemonics),
           actionEnvironmentProvider,
@@ -651,6 +660,7 @@ private ConfiguredRuleClassProvider(
       @Nullable RuleTransitionFactory trimmingTransitionFactory,
       PrerequisiteValidator prerequisiteValidator,
       ImmutableMap<String, Object> skylarkAccessibleJavaClasses,
+      ImmutableList<Bootstrap> skylarkBootstraps,
       ImmutableList<Class<?>> skylarkModules,
       ImmutableSet<String> reservedActionMnemonics,
       BuildConfiguration.ActionEnvironmentProvider actionEnvironmentProvider,
@@ -670,7 +680,7 @@ private ConfiguredRuleClassProvider(
     this.universalFragments = universalFragments;
     this.trimmingTransitionFactory = trimmingTransitionFactory;
     this.prerequisiteValidator = prerequisiteValidator;
-    this.globals = createGlobals(skylarkAccessibleJavaClasses, skylarkModules);
+    this.globals = createGlobals(skylarkAccessibleJavaClasses, skylarkBootstraps, skylarkModules);
     this.reservedActionMnemonics = reservedActionMnemonics;
     this.actionEnvironmentProvider = actionEnvironmentProvider;
     this.configurationFragmentMap = createFragmentMap(configurationFragmentFactories);
@@ -795,6 +805,7 @@ public BuildOptions createBuildOptions(OptionsClassProvider optionsProvider) {
 
   private Environment.GlobalFrame createGlobals(
       ImmutableMap<String, Object> skylarkAccessibleTopLevels,
+      ImmutableList<Bootstrap> bootstraps,
       ImmutableList<Class<?>> modules) {
     ImmutableMap.Builder<String, Object> envBuilder = ImmutableMap.builder();
 
@@ -803,6 +814,9 @@ private Environment.GlobalFrame createGlobals(
       Runtime.setupModuleGlobals(envBuilder, module);
     }
     envBuilder.putAll(skylarkAccessibleTopLevels.entrySet());
+    for (Bootstrap bootstrap : bootstraps) {
+      bootstrap.addBindingsToBuilder(envBuilder);
+    }
 
     return GlobalFrame.createForBuiltins(envBuilder.build());
   }

src/main/java/com/google/devtools/build/lib/rules/config/ConfigRules.java

@@ -18,6 +18,7 @@
 import com.google.devtools.build.lib.analysis.ConfiguredRuleClassProvider;
 import com.google.devtools.build.lib.analysis.ConfiguredRuleClassProvider.RuleSet;
 import com.google.devtools.build.lib.rules.core.CoreRules;
+import com.google.devtools.build.lib.skylarkbuildapi.config.ConfigBootstrap;
 
 /**
  * Set of rules to specify or manipulate configuration settings.
@@ -39,7 +40,7 @@ public void init(ConfiguredRuleClassProvider.Builder builder) {
         new ConfigFeatureFlagConfiguration.Loader());
 
     builder.addRuleDefinition(new ConfigRuleClasses.ConfigFeatureFlagRule());
-    builder.addSkylarkAccessibleTopLevels("config_common", new ConfigSkylarkCommon());
+    builder.addSkylarkBootstrap(new ConfigBootstrap(new ConfigSkylarkCommon()));
   }
 
   @Override

src/main/java/com/google/devtools/build/lib/skylarkbuildapi/config/ConfigBootstrap.java

@@ -0,0 +1,35 @@
+// Copyright 2018 The Bazel Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.devtools.build.lib.skylarkbuildapi.config;
+
+import com.google.common.collect.ImmutableMap.Builder;
+import com.google.devtools.build.lib.skylarkbuildapi.Bootstrap;
+
+/**
+ * A {@link Bootstrap} for config-related libraries of the build API.
+ */
+public class ConfigBootstrap implements Bootstrap {
+
+  private final ConfigSkylarkCommonApi configSkylarkCommonApi;
+
+  public ConfigBootstrap(ConfigSkylarkCommonApi configSkylarkCommonApi) {
+    this.configSkylarkCommonApi = configSkylarkCommonApi;
+  }
+
+  @Override
+  public void addBindingsToBuilder(Builder<String, Object> builder) {
+    builder.put("config_common", configSkylarkCommonApi);
+  }
+}