| // Copyright 2017 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.analysis.whitelisting; |
| |
| import static com.google.devtools.build.lib.packages.Attribute.attr; |
| import static com.google.devtools.build.lib.packages.BuildType.LABEL; |
| import static java.util.Objects.requireNonNull; |
| |
| import com.google.common.base.Preconditions; |
| import com.google.common.collect.ImmutableList; |
| import com.google.common.collect.Streams; |
| import com.google.devtools.build.lib.analysis.PackageSpecificationProvider; |
| import com.google.devtools.build.lib.analysis.RuleContext; |
| import com.google.devtools.build.lib.analysis.TransitiveInfoCollection; |
| import com.google.devtools.build.lib.analysis.config.HostTransition; |
| import com.google.devtools.build.lib.analysis.configuredtargets.RuleConfiguredTarget.Mode; |
| import com.google.devtools.build.lib.cmdline.Label; |
| import com.google.devtools.build.lib.packages.Attribute; |
| |
| /** |
| * Class used for implementing whitelists using package groups. |
| * |
| * <p>To use add an attribute {@link getAttributeFromWhitelistName(String,Label) to the rule class |
| * which needs the whitelisting mechanism and use {@link isAvailable(RuleContext,String)} to check |
| * during analysis if a rule is present |
| */ |
| public final class Whitelist { |
| |
| private Whitelist() {} |
| |
| /** |
| * Returns an Attribute.Builder that can be used to add an implicit attribute to a rule containing |
| * a package group whitelist. |
| * |
| * @param whitelistName The name of the whitelist. This has to comply with attribute naming |
| * standards and will be used as a suffix for the attribute name. |
| */ |
| public static Attribute.Builder<Label> getAttributeFromWhitelistName(String whitelistName) { |
| String attributeName = getAttributeNameFromWhitelistName(whitelistName); |
| return attr(attributeName, LABEL) |
| .cfg(HostTransition.INSTANCE) |
| .mandatoryNativeProviders(ImmutableList.of(PackageSpecificationProvider.class)); |
| } |
| |
| /** |
| * Returns whether the rule in the given RuleContext is in a whitelist. |
| * |
| * @param ruleContext The context in which this check is being executed. |
| * @param whitelistName The name of the whitelist being used. |
| */ |
| public static boolean isAvailable(RuleContext ruleContext, String whitelistName) { |
| String attributeName = getAttributeNameFromWhitelistName(whitelistName); |
| Preconditions.checkArgument(ruleContext.isAttrDefined(attributeName, LABEL)); |
| TransitiveInfoCollection packageGroup = ruleContext.getPrerequisite(attributeName, Mode.HOST); |
| Label label = ruleContext.getLabel(); |
| PackageSpecificationProvider packageSpecificationProvider = |
| packageGroup.getProvider(PackageSpecificationProvider.class); |
| requireNonNull(packageSpecificationProvider, packageGroup.getLabel().toString()); |
| return Streams.stream(packageSpecificationProvider.getPackageSpecifications()) |
| .anyMatch(p -> p.containsPackage(label.getPackageIdentifier())); |
| } |
| |
| private static String getAttributeNameFromWhitelistName(String whitelistName) { |
| return String.format("$whitelist_%s", whitelistName); |
| } |
| } |