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package org.codehaus.plexus.util.cli;
/*
* Copyright The Codehaus Foundation.
*
* 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.
*/
import java.io.IOException;
import java.io.InputStream;
import java.util.Locale;
import java.util.Map;
import java.util.Properties;
import java.util.StringTokenizer;
import java.util.Vector;
import org.codehaus.plexus.util.Os;
import org.codehaus.plexus.util.StringUtils;
/**
* @author Trygve Laugstøl
* @version $Id$
*/
public abstract class CommandLineUtils
{
/**
* A {@code StreamConsumer} providing consumed lines as a {@code String}.
*
* @see #getOutput()
*/
public static class StringStreamConsumer
implements StreamConsumer
{
private StringBuffer string = new StringBuffer();
private String ls = System.getProperty( "line.separator" );
public void consumeLine( String line )
{
string.append( line ).append( ls );
}
public String getOutput()
{
return string.toString();
}
}
/**
* Number of milliseconds per second.
*/
private static final long MILLIS_PER_SECOND = 1000L;
/**
* Number of nanoseconds per second.
*/
private static final long NANOS_PER_SECOND = 1000000000L;
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
*/
public 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
*/
public 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 Thread processHook = new Thread()
{
{
this.setName( "CommandLineUtils process shutdown hook" );
this.setContextClassLoader( null );
}
@Override
public void run()
{
p.destroy();
}
};
ShutdownHookUtils.addShutDownHook( processHook );
return new CommandLineCallable()
{
public Integer call()
throws CommandLineException
{
StreamFeeder inputFeeder = null;
StreamPumper outputPumper = null;
StreamPumper errorPumper = null;
boolean success = false;
try
{
if ( systemIn != null )
{
inputFeeder = new StreamFeeder( systemIn, p.getOutputStream() );
inputFeeder.start();
}
outputPumper = new StreamPumper( p.getInputStream(), systemOut );
outputPumper.start();
errorPumper = new StreamPumper( p.getErrorStream(), systemErr );
errorPumper.start();
int returnValue;
if ( timeoutInSeconds <= 0 )
{
returnValue = p.waitFor();
}
else
{
final long now = System.nanoTime();
final long timeout = now + NANOS_PER_SECOND * timeoutInSeconds;
while ( isAlive( p ) && ( System.nanoTime() < timeout ) )
{
// The timeout is specified in seconds. Therefore we must not sleep longer than one second
// but we should sleep as long as possible to reduce the number of iterations performed.
Thread.sleep( MILLIS_PER_SECOND - 1L );
}
if ( isAlive( p ) )
{
throw new InterruptedException( String.format( "Process timed out after %d seconds.",
timeoutInSeconds ) );
}
returnValue = p.exitValue();
}
// TODO Find out if waitUntilDone needs to be called using a try-finally construct. The method may
// throw an
// InterruptedException so that calls to waitUntilDone may be skipped.
// try
// {
// if ( inputFeeder != null )
// {
// inputFeeder.waitUntilDone();
// }
// }
// finally
// {
// try
// {
// outputPumper.waitUntilDone();
// }
// finally
// {
// errorPumper.waitUntilDone();
// }
// }
if ( inputFeeder != null )
{
inputFeeder.waitUntilDone();
}
outputPumper.waitUntilDone();
errorPumper.waitUntilDone();
if ( inputFeeder != null )
{
inputFeeder.close();
handleException( inputFeeder, "stdin" );
}
outputPumper.close();
handleException( outputPumper, "stdout" );
errorPumper.close();
handleException( errorPumper, "stderr" );
success = true;
return returnValue;
}
catch ( InterruptedException ex )
{
throw new CommandLineTimeOutException( "Error while executing external command, process killed.",
ex );
}
finally
{
if ( inputFeeder != null )
{
inputFeeder.disable();
}
if ( outputPumper != null )
{
outputPumper.disable();
}
if ( errorPumper != null )
{
errorPumper.disable();
}
try
{
ShutdownHookUtils.removeShutdownHook( processHook );
processHook.run();
}
finally
{
try
{
if ( inputFeeder != null )
{
inputFeeder.close();
if ( success )
{
success = false;
handleException( inputFeeder, "stdin" );
success = true; // Only reached when no exception has been thrown.
}
}
}
finally
{
try
{
if ( outputPumper != null )
{
outputPumper.close();
if ( success )
{
success = false;
handleException( outputPumper, "stdout" );
success = true; // Only reached when no exception has been thrown.
}
}
}
finally
{
if ( errorPumper != null )
{
errorPumper.close();
if ( success )
{
handleException( errorPumper, "stderr" );
}
}
}
}
}
}
}
};
}
private static void handleException( final StreamPumper streamPumper, final String streamName )
throws CommandLineException
{
if ( streamPumper.getException() != null )
{
throw new CommandLineException( String.format( "Failure processing %s.", streamName ),
streamPumper.getException() );
}
}
private static void handleException( final StreamFeeder streamFeeder, final String streamName )
throws CommandLineException
{
if ( streamFeeder.getException() != null )
{
throw new CommandLineException( String.format( "Failure processing %s.", streamName ),
streamFeeder.getException() );
}
}
/**
* 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
{
Properties envVars = new Properties();
Map envs = System.getenv();
for ( String key : envs.keySet() )
{
String value = envs.get( key );
if ( !caseSensitive )
{
key = key.toUpperCase( Locale.ENGLISH );
}
envVars.put( key, value );
}
return envVars;
}
public 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 );
Vector v = new Vector();
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 )
{
v.addElement( current.toString() );
current.setLength( 0 );
}
}
else
{
current.append( nextTok );
}
break;
}
}
if ( current.length() != 0 )
{
v.addElement( current.toString() );
}
if ( ( state == inQuote ) || ( state == inDoubleQuote ) )
{
throw new CommandLineException( "unbalanced quotes in " + toProcess );
}
String[] args = new String[v.size()];
v.copyInto( args );
return args;
}
/**
*
* Put quotes around the given String if necessary.
*
*
* If the argument doesn't include spaces or quotes, return it as is. If it contains double quotes, use single
* quotes - else surround the argument by double quotes.
*
*
* @throws CommandLineException if the argument contains both, single and double quotes.
* @deprecated Use {@link StringUtils#quoteAndEscape(String, char, char[], char[], char, boolean)},
* {@link StringUtils#quoteAndEscape(String, char, char[], char, boolean)}, or
* {@link StringUtils#quoteAndEscape(String, char)} instead.
*/
@SuppressWarnings( { "JavaDoc", "deprecation" } )
public static String quote( String argument )
throws CommandLineException
{
return quote( argument, false, false, true );
}
/**
*
* Put quotes around the given String if necessary.
*
*
* If the argument doesn't include spaces or quotes, return it as is. If it contains double quotes, use single
* quotes - else surround the argument by double quotes.
*
*
* @throws CommandLineException if the argument contains both, single and double quotes.
* @deprecated Use {@link StringUtils#quoteAndEscape(String, char, char[], char[], char, boolean)},
* {@link StringUtils#quoteAndEscape(String, char, char[], char, boolean)}, or
* {@link StringUtils#quoteAndEscape(String, char)} instead.
*/
@SuppressWarnings( { "JavaDoc", "UnusedDeclaration", "deprecation" } )
public static String quote( String argument, boolean wrapExistingQuotes )
throws CommandLineException
{
return quote( argument, false, false, wrapExistingQuotes );
}
/**
* @deprecated Use {@link StringUtils#quoteAndEscape(String, char, char[], char[], char, boolean)},
* {@link StringUtils#quoteAndEscape(String, char, char[], char, boolean)}, or
* {@link StringUtils#quoteAndEscape(String, char)} instead.
*/
@SuppressWarnings( { "JavaDoc" } )
public static String quote( String argument, boolean escapeSingleQuotes, boolean escapeDoubleQuotes,
boolean wrapExistingQuotes )
throws CommandLineException
{
if ( argument.contains( "\"" ) )
{
if ( argument.contains( "\'" ) )
{
throw new CommandLineException( "Can't handle single and double quotes in same argument" );
}
else
{
if ( escapeSingleQuotes )
{
return "\\\'" + argument + "\\\'";
}
else if ( wrapExistingQuotes )
{
return '\'' + argument + '\'';
}
}
}
else if ( argument.contains( "\'" ) )
{
if ( escapeDoubleQuotes )
{
return "\\\"" + argument + "\\\"";
}
else if ( wrapExistingQuotes )
{
return '\"' + argument + '\"';
}
}
else if ( argument.contains( " " ) )
{
if ( escapeDoubleQuotes )
{
return "\\\"" + argument + "\\\"";
}
else
{
return '\"' + argument + '\"';
}
}
return argument;
}
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();
}
}