org.apache.maven.shared.utils.cli.CommandLineUtils Maven / Gradle / Ivy
package org.apache.maven.shared.utils.cli;
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Properties;
import java.util.StringTokenizer;
import org.apache.maven.shared.utils.Os;
import org.apache.maven.shared.utils.StringUtils;
/**
* @author Trygve Laugstøl
* @version $Id: CommandLineUtils.java 1398150 2012-10-14 23:42:22Z hboutemy $
*/
public abstract class CommandLineUtils
{
public static class StringStreamConsumer
implements StreamConsumer
{
private final StringBuffer string = new StringBuffer();
private static final String LS = System.getProperty( "line.separator" );
public void consumeLine( String line )
{
string.append( line ).append( LS );
}
public String getOutput()
{
return string.toString();
}
}
private static class ProcessHook
extends Thread
{
private final Process process;
private ProcessHook( Process process )
{
super( "CommandlineUtils process shutdown hook" );
this.process = process;
this.setContextClassLoader( null );
}
public void run()
{
process.destroy();
}
}
public static int executeCommandLine( Commandline cl, StreamConsumer systemOut, StreamConsumer systemErr )
throws CommandLineException
{
return executeCommandLine( cl, null, systemOut, systemErr, 0 );
}
public static int executeCommandLine( Commandline cl, StreamConsumer systemOut, StreamConsumer systemErr,
int timeoutInSeconds )
throws CommandLineException
{
return executeCommandLine( cl, null, systemOut, systemErr, timeoutInSeconds );
}
public static int executeCommandLine( Commandline cl, InputStream systemIn, StreamConsumer systemOut,
StreamConsumer systemErr )
throws CommandLineException
{
return executeCommandLine( cl, systemIn, systemOut, systemErr, 0 );
}
/**
* @param cl The command line to execute
* @param systemIn The input to read from, must be thread safe
* @param systemOut A consumer that receives output, must be thread safe
* @param systemErr A consumer that receives system error stream output, must be thread safe
* @param timeoutInSeconds Positive integer to specify timeout, zero and negative integers for no timeout.
* @return A return value, see {@link Process#exitValue()}
* @throws CommandLineException or CommandLineTimeOutException if time out occurs
* @noinspection ThrowableResultOfMethodCallIgnored
*/
private static int executeCommandLine( Commandline cl, InputStream systemIn, StreamConsumer systemOut,
StreamConsumer systemErr, int timeoutInSeconds )
throws CommandLineException
{
final CommandLineCallable future =
executeCommandLineAsCallable( cl, systemIn, systemOut, systemErr, timeoutInSeconds );
return future.call();
}
/**
* Immediately forks a process, returns a callable that will block until process is complete.
*
* @param cl The command line to execute
* @param systemIn The input to read from, must be thread safe
* @param systemOut A consumer that receives output, must be thread safe
* @param systemErr A consumer that receives system error stream output, must be thread safe
* @param timeoutInSeconds Positive integer to specify timeout, zero and negative integers for no timeout.
* @return A CommandLineCallable that provides the process return value, see {@link Process#exitValue()}. "call" must be called on
* this to be sure the forked process has terminated, no guarantees is made about
* any internal state before after the completion of the call statements
* @throws CommandLineException or CommandLineTimeOutException if time out occurs
* @noinspection ThrowableResultOfMethodCallIgnored
*/
private static CommandLineCallable executeCommandLineAsCallable( final Commandline cl, final InputStream systemIn,
final StreamConsumer systemOut,
final StreamConsumer systemErr,
final int timeoutInSeconds )
throws CommandLineException
{
if ( cl == null )
{
throw new IllegalArgumentException( "cl cannot be null." );
}
final Process p = cl.execute();
final StreamFeeder inputFeeder = systemIn != null ? new StreamFeeder( systemIn, p.getOutputStream() ) : null;
final StreamPumper outputPumper = new StreamPumper( p.getInputStream(), systemOut );
final StreamPumper errorPumper = new StreamPumper( p.getErrorStream(), systemErr );
if ( inputFeeder != null )
{
inputFeeder.start();
}
outputPumper.start();
errorPumper.start();
final ProcessHook processHook = new ProcessHook( p );
ShutdownHookUtils.addShutDownHook( processHook );
return new CommandLineCallable()
{
public Integer call()
throws CommandLineException
{
try
{
int returnValue;
if ( timeoutInSeconds <= 0 )
{
returnValue = p.waitFor();
}
else
{
long now = System.currentTimeMillis();
long timeoutInMillis = 1000L * timeoutInSeconds;
long finish = now + timeoutInMillis;
while ( isAlive( p ) && ( System.currentTimeMillis() < finish ) )
{
Thread.sleep( 10 );
}
if ( isAlive( p ) )
{
throw new InterruptedException(
"Process timeout out after " + timeoutInSeconds + " seconds" );
}
returnValue = p.exitValue();
}
waitForAllPumpers( inputFeeder, outputPumper, errorPumper );
if ( outputPumper.getException() != null )
{
throw new CommandLineException( "Error inside systemOut parser", outputPumper.getException() );
}
if ( errorPumper.getException() != null )
{
throw new CommandLineException( "Error inside systemErr parser", errorPumper.getException() );
}
return returnValue;
}
catch ( InterruptedException ex )
{
if ( inputFeeder != null )
{
inputFeeder.disable();
}
outputPumper.disable();
errorPumper.disable();
throw new CommandLineTimeOutException( "Error while executing external command, process killed.",
ex );
}
finally
{
ShutdownHookUtils.removeShutdownHook( processHook );
processHook.run();
if ( inputFeeder != null )
{
inputFeeder.close();
}
outputPumper.close();
errorPumper.close();
}
}
};
}
private static void waitForAllPumpers( StreamFeeder inputFeeder, StreamPumper outputPumper,
StreamPumper errorPumper )
throws InterruptedException
{
if ( inputFeeder != null )
{
inputFeeder.waitUntilDone();
}
outputPumper.waitUntilDone();
errorPumper.waitUntilDone();
}
/**
* Gets the shell environment variables for this process. Note that the returned mapping from variable names to
* values will always be case-sensitive regardless of the platform, i.e. getSystemEnvVars().get("path")
* and getSystemEnvVars().get("PATH") will in general return different values. However, on platforms
* with case-insensitive environment variables like Windows, all variable names will be normalized to upper case.
*
* @return The shell environment variables, can be empty but never null.
* @throws IOException If the environment variables could not be queried from the shell.
* @see System#getenv() System.getenv() API, new in JDK 5.0, to get the same result
* since 2.0.2 System#getenv() will be used if available in the current running jvm.
*/
public static Properties getSystemEnvVars()
throws IOException
{
return getSystemEnvVars( !Os.isFamily( Os.FAMILY_WINDOWS ) );
}
/**
* Return the shell environment variables. If caseSensitive == true, then envar
* keys will all be upper-case.
*
* @param caseSensitive Whether environment variable keys should be treated case-sensitively.
* @return Properties object of (possibly modified) envar keys mapped to their values.
* @throws IOException .
* @see System#getenv() System.getenv() API, new in JDK 5.0, to get the same result
* since 2.0.2 System#getenv() will be used if available in the current running jvm.
*/
public static Properties getSystemEnvVars( boolean caseSensitive )
throws IOException
{
// check if it's 1.5+ run
try
{
Map envs = System.getenv();
return ensureCaseSensitivity( envs, caseSensitive );
}
catch ( IllegalAccessException e )
{
throw new IOException( e.getMessage() );
}
catch ( IllegalArgumentException e )
{
throw new IOException( e.getMessage() );
}
catch ( InvocationTargetException e )
{
throw new IOException( e.getMessage() );
}
}
private static boolean isAlive( Process p )
{
if ( p == null )
{
return false;
}
try
{
p.exitValue();
return false;
}
catch ( IllegalThreadStateException e )
{
return true;
}
}
public static String[] translateCommandline( String toProcess )
throws Exception
{
if ( ( toProcess == null ) || ( toProcess.length() == 0 ) )
{
return new String[0];
}
// parse with a simple finite state machine
final int normal = 0;
final int inQuote = 1;
final int inDoubleQuote = 2;
int state = normal;
StringTokenizer tok = new StringTokenizer( toProcess, "\"\' ", true );
List tokens = new ArrayList();
StringBuilder current = new StringBuilder();
while ( tok.hasMoreTokens() )
{
String nextTok = tok.nextToken();
switch ( state )
{
case inQuote:
if ( "\'".equals( nextTok ) )
{
state = normal;
}
else
{
current.append( nextTok );
}
break;
case inDoubleQuote:
if ( "\"".equals( nextTok ) )
{
state = normal;
}
else
{
current.append( nextTok );
}
break;
default:
if ( "\'".equals( nextTok ) )
{
state = inQuote;
}
else if ( "\"".equals( nextTok ) )
{
state = inDoubleQuote;
}
else if ( " ".equals( nextTok ) )
{
if ( current.length() != 0 )
{
tokens.add( current.toString() );
current.setLength( 0 );
}
}
else
{
current.append( nextTok );
}
break;
}
}
if ( current.length() != 0 )
{
tokens.add( current.toString() );
}
if ( ( state == inQuote ) || ( state == inDoubleQuote ) )
{
throw new CommandLineException( "unbalanced quotes in " + toProcess );
}
return tokens.toArray( new String[tokens.size()] );
}
public static String toString( String... line )
{
// empty path return empty string
if ( ( line == null ) || ( line.length == 0 ) )
{
return "";
}
// path containing one or more elements
final StringBuilder result = new StringBuilder();
for ( int i = 0; i < line.length; i++ )
{
if ( i > 0 )
{
result.append( ' ' );
}
try
{
result.append( StringUtils.quoteAndEscape( line[i], '\"' ) );
}
catch ( Exception e )
{
System.err.println( "Error quoting argument: " + e.getMessage() );
}
}
return result.toString();
}
static Properties ensureCaseSensitivity( Map envs, boolean preserveKeyCase )
throws IllegalAccessException, IllegalArgumentException, InvocationTargetException
{
Properties envVars = new Properties();
for ( Map.Entry entry : envs.entrySet() )
{
envVars.put( !preserveKeyCase ? entry.getKey().toUpperCase( Locale.ENGLISH ) : entry.getKey(),
entry.getValue() );
}
return envVars;
}
}
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