| // Copyright 2014 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.runtime; |
| |
| import com.google.common.collect.ImmutableList; |
| import com.google.common.collect.Iterables; |
| import com.google.common.collect.ListMultimap; |
| import com.google.devtools.build.lib.events.Event; |
| import com.google.devtools.build.lib.events.EventHandler; |
| import com.google.devtools.build.lib.util.OS; |
| import com.google.devtools.common.options.OptionValueDescription; |
| import com.google.devtools.common.options.OptionsParser; |
| import com.google.devtools.common.options.OptionsParsingException; |
| import com.google.devtools.common.options.ParsedOptionDescription; |
| import java.util.ArrayList; |
| import java.util.HashSet; |
| import java.util.LinkedHashSet; |
| import java.util.List; |
| import java.util.Set; |
| import java.util.function.Consumer; |
| |
| /** Encapsulates logic for performing --config option expansion. */ |
| final class ConfigExpander { |
| |
| private ConfigExpander() {} |
| |
| private static String getPlatformName() { |
| switch (OS.getCurrent()) { |
| case LINUX: |
| return "linux"; |
| case DARWIN: |
| return "macos"; |
| case WINDOWS: |
| return "windows"; |
| case FREEBSD: |
| return "freebsd"; |
| case OPENBSD: |
| return "openbsd"; |
| default: |
| return OS.getCurrent().getCanonicalName(); |
| } |
| } |
| |
| /** |
| * If --enable_platform_specific_config is true and the corresponding config definition exists, we |
| * should enable the platform specific config. |
| */ |
| private static boolean shouldEnablePlatformSpecificConfig( |
| OptionValueDescription enablePlatformSpecificConfigDescription, |
| ListMultimap<String, RcChunkOfArgs> commandToRcArgs, |
| List<String> commandsToParse) { |
| if (enablePlatformSpecificConfigDescription == null |
| || !(boolean) enablePlatformSpecificConfigDescription.getValue()) { |
| return false; |
| } |
| |
| for (String commandName : commandsToParse) { |
| String defaultConfigDef = commandName + ":" + getPlatformName(); |
| if (commandToRcArgs.containsKey(defaultConfigDef)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| /** |
| * Expands --config options present in the requested commands using the options configuration |
| * provided in commandToRcArgs. |
| * |
| * @param eventHandler collects any warnings encountered. |
| * @param rcFileNotesConsumer collects any informational messages encountered. |
| * @param optionsParser will parse the expanded --config representations. |
| * @throws OptionsParsingException if a fatal problem with the configuration is encountered. |
| */ |
| static void expandConfigOptions( |
| EventHandler eventHandler, |
| ListMultimap<String, RcChunkOfArgs> commandToRcArgs, |
| List<String> commandsToParse, |
| Consumer<String> rcFileNotesConsumer, |
| OptionsParser optionsParser) |
| throws OptionsParsingException { |
| |
| OptionValueDescription configValueDescription = |
| optionsParser.getOptionValueDescription("config"); |
| if (configValueDescription != null && configValueDescription.getCanonicalInstances() != null) { |
| // Find the base set of configs. This does not include the config options that might be |
| // recursively included. |
| ImmutableList<ParsedOptionDescription> configInstances = |
| ImmutableList.copyOf(configValueDescription.getCanonicalInstances()); |
| |
| // Expand the configs that are mentioned in the input. Flatten these expansions before parsing |
| // them, to preserve order. |
| for (ParsedOptionDescription configInstance : configInstances) { |
| String configValueToExpand = (String) configInstance.getConvertedValue(); |
| List<String> expansion = |
| getExpansion( |
| eventHandler, |
| commandToRcArgs, |
| commandsToParse, |
| configValueToExpand, |
| rcFileNotesConsumer); |
| optionsParser.parseArgsAsExpansionOfOption( |
| configInstance, String.format("expanded from --%s", configValueToExpand), expansion); |
| } |
| } |
| |
| OptionValueDescription enablePlatformSpecificConfigDescription = |
| optionsParser.getOptionValueDescription("enable_platform_specific_config"); |
| if (shouldEnablePlatformSpecificConfig( |
| enablePlatformSpecificConfigDescription, commandToRcArgs, commandsToParse)) { |
| List<String> expansion = |
| getExpansion( |
| eventHandler, |
| commandToRcArgs, |
| commandsToParse, |
| getPlatformName(), |
| rcFileNotesConsumer); |
| optionsParser.parseArgsAsExpansionOfOption( |
| Iterables.getOnlyElement(enablePlatformSpecificConfigDescription.getCanonicalInstances()), |
| String.format("enabled by --enable_platform_specific_config"), |
| expansion); |
| } |
| |
| // At this point, we've expanded everything, identify duplicates, if any, to warn about |
| // re-application. |
| List<String> configs = optionsParser.getOptions(CommonCommandOptions.class).configs; |
| Set<String> configSet = new HashSet<>(); |
| LinkedHashSet<String> duplicateConfigs = new LinkedHashSet<>(); |
| for (String configValue : configs) { |
| if (!configSet.add(configValue)) { |
| duplicateConfigs.add(configValue); |
| } |
| } |
| if (!duplicateConfigs.isEmpty()) { |
| eventHandler.handle( |
| Event.warn( |
| String.format( |
| "The following configs were expanded more than once: %s. For repeatable flags, " |
| + "repeats are counted twice and may lead to unexpected behavior.", |
| duplicateConfigs))); |
| } |
| } |
| |
| private static List<String> getExpansion( |
| EventHandler eventHandler, |
| ListMultimap<String, RcChunkOfArgs> commandToRcArgs, |
| List<String> commandsToParse, |
| String configToExpand, |
| Consumer<String> rcFileNotesConsumer) |
| throws OptionsParsingException { |
| LinkedHashSet<String> configAncestorSet = new LinkedHashSet<>(); |
| configAncestorSet.add(configToExpand); |
| List<String> longestChain = new ArrayList<>(); |
| List<String> finalExpansion = |
| getExpansion( |
| commandToRcArgs, |
| commandsToParse, |
| configAncestorSet, |
| configToExpand, |
| longestChain, |
| rcFileNotesConsumer); |
| |
| // In order to prevent warning about a long chain of 13 configs at the 10, 11, 12, and 13 |
| // point, we identify the longest chain for this 'high-level' --config found and only warn |
| // about it once. This may mean we missed a fork where each branch was independently long |
| // enough to warn, but the single warning should convey the message reasonably. |
| if (longestChain.size() >= 10) { |
| eventHandler.handle( |
| Event.warn( |
| String.format( |
| "There is a recursive chain of configs %s configs long: %s. This seems " |
| + "excessive, and might be hiding errors.", |
| longestChain.size(), longestChain))); |
| } |
| return finalExpansion; |
| } |
| |
| /** |
| * @param configAncestorSet is the chain of configs that have led to this one getting expanded. |
| * This should only contain the configs that expanded, recursively, to this one, and should |
| * not contain "siblings," as it is used to detect cycles. {@code build:foo --config=bar}, |
| * {@code build:bar --config=foo}, is a cycle, detected because this list will be [foo, bar] |
| * when we find another 'foo' to expand. However, {@code build:foo --config=bar}, {@code |
| * build:foo --config=bar} is not a cycle just because bar is expanded twice, and the 1st bar |
| * should not be in the parents list of the second bar. |
| * @param longestChain will be populated with the longest inheritance chain of configs. |
| */ |
| private static List<String> getExpansion( |
| ListMultimap<String, RcChunkOfArgs> commandToRcArgs, |
| List<String> commandsToParse, |
| LinkedHashSet<String> configAncestorSet, |
| String configToExpand, |
| List<String> longestChain, |
| Consumer<String> rcFileNotesConsumer) |
| throws OptionsParsingException { |
| List<String> expansion = new ArrayList<>(); |
| boolean foundDefinition = false; |
| // The expansion order of rc files is first by command priority, and then in the order the |
| // rc files were read, respecting import statement placement. |
| for (String commandToParse : commandsToParse) { |
| String configDef = commandToParse + ":" + configToExpand; |
| for (RcChunkOfArgs rcArgs : commandToRcArgs.get(configDef)) { |
| foundDefinition = true; |
| rcFileNotesConsumer.accept( |
| String.format( |
| "Found applicable config definition %s in file %s: %s", |
| configDef, rcArgs.getRcFile(), String.join(" ", rcArgs.getArgs()))); |
| |
| // For each arg in the rcARgs chunk, we first check if it is a config, and if so, expand |
| // it in place. We avoid cycles by tracking the parents of this config. |
| for (String arg : rcArgs.getArgs()) { |
| expansion.add(arg); |
| if (arg.length() >= 8 && arg.substring(0, 8).equals("--config")) { |
| // We have a config. For sanity, because we don't want to worry about formatting, |
| // we will only accept --config=value, and will not accept value on a following line. |
| int charOfConfigValue = arg.indexOf('='); |
| if (charOfConfigValue < 0) { |
| throw new OptionsParsingException( |
| String.format( |
| "In file %s, the definition of config %s expands to another config " |
| + "that either has no value or is not in the form --config=value. For " |
| + "recursive config definitions, please do not provide the value in a " |
| + "separate token, such as in the form '--config value'.", |
| rcArgs.getRcFile(), configToExpand)); |
| } |
| String newConfigValue = arg.substring(charOfConfigValue + 1); |
| LinkedHashSet<String> extendedConfigAncestorSet = |
| new LinkedHashSet<>(configAncestorSet); |
| if (!extendedConfigAncestorSet.add(newConfigValue)) { |
| throw new OptionsParsingException( |
| String.format( |
| "Config expansion has a cycle: config value %s expands to itself, " |
| + "see inheritance chain %s", |
| newConfigValue, extendedConfigAncestorSet)); |
| } |
| if (extendedConfigAncestorSet.size() > longestChain.size()) { |
| longestChain.clear(); |
| longestChain.addAll(extendedConfigAncestorSet); |
| } |
| |
| expansion.addAll( |
| getExpansion( |
| commandToRcArgs, |
| commandsToParse, |
| extendedConfigAncestorSet, |
| newConfigValue, |
| longestChain, |
| rcFileNotesConsumer)); |
| } |
| } |
| } |
| } |
| |
| if (!foundDefinition) { |
| throw new OptionsParsingException( |
| "Config value " + configToExpand + " is not defined in any .rc file"); |
| } |
| return expansion; |
| } |
| } |
