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// Copyright 2014 Google Inc. 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.standalone;
import com.google.devtools.build.lib.actions.ActionExecutionContext;
import com.google.devtools.build.lib.actions.ExecException;
import com.google.devtools.build.lib.actions.ExecutionStrategy;
import com.google.devtools.build.lib.actions.Executor;
import com.google.devtools.build.lib.actions.Spawn;
import com.google.devtools.build.lib.actions.SpawnActionContext;
import com.google.devtools.build.lib.actions.UserExecException;
import com.google.devtools.build.lib.shell.Command;
import com.google.devtools.build.lib.shell.CommandException;
import com.google.devtools.build.lib.syntax.Label;
import com.google.devtools.build.lib.util.CommandFailureUtils;
import com.google.devtools.build.lib.util.OS;
import com.google.devtools.build.lib.util.OsUtils;
import com.google.devtools.build.lib.util.io.FileOutErr;
import com.google.devtools.build.lib.vfs.Path;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
/**
* Strategy that uses subprocessing to execute a process.
*/
@ExecutionStrategy(name = { "standalone" }, contextType = SpawnActionContext.class)
public class LocalSpawnStrategy implements SpawnActionContext {
private final boolean verboseFailures;
private final Path processWrapper;
public LocalSpawnStrategy(Path execRoot, boolean verboseFailures) {
this.verboseFailures = verboseFailures;
this.processWrapper = execRoot.getRelative(
"_bin/process-wrapper" + OsUtils.executableExtension());
}
/**
* Executes the given {@code spawn}.
*/
@Override
public void exec(Spawn spawn,
ActionExecutionContext actionExecutionContext)
throws ExecException {
Executor executor = actionExecutionContext.getExecutor();
if (executor.reportsSubcommands()) {
executor.reportSubcommand(Label.print(spawn.getOwner().getLabel()),
spawn.asShellCommand(executor.getExecRoot()));
}
// We must wrap the subprocess with process-wrapper to kill the process tree.
// All actions therefore depend on the process-wrapper file. Since it's embedded,
// we don't bother with declaring it as an input.
List<String> args = new ArrayList<>();
if (OS.getCurrent() != OS.WINDOWS) {
// TODO(bazel-team): process-wrapper seems to work on Windows, but requires
// additional setup as it is an msys2 binary, so it needs msys2 DLLs on %PATH%.
// Disable it for now to make the setup easier and to avoid further PATH hacks.
// Ideally we should have a native implementation of process-wrapper for Windows.
args.add(processWrapper.getPathString());
args.add("-1"); /* timeout */
args.add("0"); /* kill delay. */
// TODO(bazel-team): use process-wrapper redirection so we don't have to
// pass test logs through the Java heap.
args.add("-"); /* stdout. */
args.add("-"); /* stderr. */
}
args.addAll(spawn.getArguments());
String cwd = executor.getExecRoot().getPathString();
Command cmd = new Command(args.toArray(new String[]{}), spawn.getEnvironment(), new File(cwd));
FileOutErr outErr = actionExecutionContext.getFileOutErr();
try {
cmd.execute(
/* stdin */ new byte[]{},
Command.NO_OBSERVER,
outErr.getOutputStream(),
outErr.getErrorStream(),
/*killSubprocessOnInterrupt*/ true);
} catch (CommandException e) {
String message = CommandFailureUtils.describeCommandFailure(
verboseFailures, spawn.getArguments(), spawn.getEnvironment(), cwd);
throw new UserExecException(String.format("%s: %s", message, e));
}
}
@Override
public String strategyLocality(String mnemonic, boolean remotable) {
return "standalone";
}
@Override
public boolean isRemotable(String mnemonic, boolean remotable) {
return false;
}
}
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