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// 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.bazel.commands;
import com.google.common.base.Joiner;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
import com.google.common.collect.Sets;
import com.google.devtools.build.lib.Constants;
import com.google.devtools.build.lib.events.Event;
import com.google.devtools.build.lib.packages.Target;
import com.google.devtools.build.lib.pkgcache.PackageCacheOptions;
import com.google.devtools.build.lib.query2.AbstractBlazeQueryEnvironment;
import com.google.devtools.build.lib.query2.engine.QueryEnvironment.Setting;
import com.google.devtools.build.lib.query2.engine.QueryException;
import com.google.devtools.build.lib.query2.engine.QueryExpression;
import com.google.devtools.build.lib.rules.java.JavaOptions;
import com.google.devtools.build.lib.runtime.BlazeCommand;
import com.google.devtools.build.lib.runtime.BlazeRuntime;
import com.google.devtools.build.lib.runtime.Command;
import com.google.devtools.build.lib.runtime.CommandEnvironment;
import com.google.devtools.build.lib.runtime.commands.QueryCommand;
import com.google.devtools.build.lib.util.AbruptExitException;
import com.google.devtools.build.lib.util.ExitCode;
import com.google.devtools.common.options.OptionsParser;
import com.google.devtools.common.options.OptionsProvider;
/**
* Fetches external repositories. Which is so fetch.
*/
@Command(name = FetchCommand.NAME,
options = {
PackageCacheOptions.class,
FetchOptions.class,
JavaOptions.class,
},
help = "resource:fetch.txt",
shortDescription = "Fetches external repositories that are prerequisites to the targets.",
allowResidue = true,
completion = "label")
public final class FetchCommand implements BlazeCommand {
// TODO(kchodorow): add an option to force-fetch targets, even if they're already downloaded.
// TODO(kchodorow): this would be a great time to check for difference and invalidate the upward
// transitive closure for local repositories.
public static final String NAME = "fetch";
@Override
public void editOptions(CommandEnvironment env, OptionsParser optionsParser) { }
@Override
public ExitCode exec(CommandEnvironment env, OptionsProvider options) {
BlazeRuntime runtime = env.getRuntime();
if (options.getResidue().isEmpty()) {
env.getReporter().handle(Event.error(String.format(
"missing fetch expression. Type '%s help fetch' for syntax and help",
Constants.PRODUCT_NAME)));
return ExitCode.COMMAND_LINE_ERROR;
}
try {
env.setupPackageCache(
options.getOptions(PackageCacheOptions.class),
runtime.getDefaultsPackageContent());
} catch (InterruptedException e) {
env.getReporter().handle(Event.error("fetch interrupted"));
return ExitCode.INTERRUPTED;
} catch (AbruptExitException e) {
env.getReporter().handle(Event.error(null, "Unknown error: " + e.getMessage()));
return e.getExitCode();
}
PackageCacheOptions pkgOptions = options.getOptions(PackageCacheOptions.class);
if (!pkgOptions.fetch) {
env.getReporter().handle(Event.error(null, "You cannot run fetch with --fetch=false"));
return ExitCode.COMMAND_LINE_ERROR;
}
// Querying for all of the dependencies of the targets has the side-effect of populating the
// Skyframe graph for external targets, which requires downloading them. The JDK is required to
// build everything but isn't counted as a dep in the build graph so we add it manually.
JavaOptions javaOptions = options.getOptions(JavaOptions.class);
ImmutableList.Builder<String> labelsToLoad = new ImmutableList.Builder<String>()
.addAll(options.getResidue());
if (String.valueOf(javaOptions.javaLangtoolsJar).equals(JavaOptions.DEFAULT_LANGTOOLS)) {
labelsToLoad.add(javaOptions.javaBase);
} else {
// TODO(kchodroow): Remove this when OS X isn't as hacky about finding the JVM. Our test
// framework currently doesn't set up the JDK normally on OS X, so attempting to fetch
// tools/jdk:jdk will cause errors.
labelsToLoad.add(String.valueOf(javaOptions.javaToolchain));
}
String query = Joiner.on(" union ").join(labelsToLoad.build());
query = "deps(" + query + ")";
AbstractBlazeQueryEnvironment<Target> queryEnv = QueryCommand.newQueryEnvironment(
env, options.getOptions(FetchOptions.class).keepGoing, false,
Lists.<String>newArrayList(), 200, Sets.<Setting>newHashSet());
// 1. Parse query:
QueryExpression expr;
try {
expr = QueryExpression.parse(query, queryEnv);
} catch (QueryException e) {
env.getReporter().handle(Event.error(
null, "Error while parsing '" + query + "': " + e.getMessage()));
return ExitCode.COMMAND_LINE_ERROR;
}
// 2. Evaluate expression:
try {
queryEnv.evaluateQuery(expr);
} catch (QueryException | InterruptedException e) {
// Keep consistent with reportBuildFileError()
env.getReporter().handle(Event.error(e.getMessage()));
return ExitCode.COMMAND_LINE_ERROR;
}
env.getReporter().handle(
Event.progress("All external dependencies fetched successfully."));
return ExitCode.SUCCESS;
}
}
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