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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.util;
import com.google.devtools.build.lib.shell.AbnormalTerminationException;
import com.google.devtools.build.lib.shell.Command;
import com.google.devtools.build.lib.shell.CommandException;
import com.google.devtools.build.lib.shell.CommandResult;
import java.util.Arrays;
import java.util.Collection;
import java.util.Map;
/**
* Utility methods relating to the {@link Command} class.
*/
public class CommandUtils {
private CommandUtils() {} // Prevent instantiation.
private static Collection<String> commandLine(Command command) {
return Arrays.asList(command.getCommandLineElements());
}
private static Map<String, String> env(Command command) {
return command.getEnvironmentVariables();
}
private static String cwd(Command command) {
return command.getWorkingDirectory() == null ? null : command.getWorkingDirectory().getPath();
}
/**
* Construct an error message that describes a failed command invocation.
* Currently this returns a message of the form "error executing command foo
* bar baz".
*/
public static String describeCommandError(boolean verbose, Command command) {
return CommandFailureUtils.describeCommandError(verbose, commandLine(command), env(command),
cwd(command));
}
/**
* Construct an error message that describes a failed command invocation.
* Currently this returns a message of the form "foo failed: error executing
* command /dir/foo bar baz".
*/
public static String describeCommandFailure(boolean verbose, Command command) {
return CommandFailureUtils.describeCommandFailure(verbose, commandLine(command), env(command),
cwd(command));
}
/**
* Construct an error message that describes a failed command invocation.
* Currently this returns a message of the form "foo failed: error executing
* command /dir/foo bar baz: exception message", with the
* command's stdout and stderr output appended if available.
*/
public static String describeCommandFailure(boolean verbose, CommandException exception) {
String message = describeCommandFailure(verbose, exception.getCommand()) + ": "
+ exception.getMessage();
if (exception instanceof AbnormalTerminationException) {
CommandResult result = ((AbnormalTerminationException) exception).getResult();
try {
return message + "\n" +
new String(result.getStdout()) +
new String(result.getStderr());
} catch (IllegalStateException e) {
// This can happen if the command didn't save stdout/stderr,
// so ignore this exception and fall through to the ordinary case.
}
}
return message;
}
}
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