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package org.openslx.runvirt.plugin.qemu;
import org.apache.log4j.BasicConfigurator;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
import org.openslx.runvirt.plugin.qemu.cmdln.CommandLineArgs;
import org.openslx.runvirt.plugin.qemu.cmdln.CommandLineArgs.CmdLnOption;
import org.openslx.runvirt.plugin.qemu.cmdln.CommandLineArgsException;
/**
* Run-virt QEMU plugin (command line tool) to finalize a Libvirt domain XML configuration.
*
* @author Manuel Bentele
* @version 1.0
*/
public class App
{
/**
* Stores name of the run-virt QEMU plugin (command line tool).
*/
public static final String APP_NAME = "run-virt QEMU plugin";
/**
* Stores description of the run-virt QEMU plugin (command line tool).
*/
public static final String APP_DESC = "Finalize a Libvirt VM (domain XML) configuration and manage the VM.";
/**
* Stores additional information for the run-virt QEMU plugin (command line tool).
*/
public static final String APP_INFO = "The " + APP_NAME + " is part of the bwLehrpool infrastructure.";
/**
* Instance of a logger to log messages.
*/
private static final Logger LOGGER = LogManager.getLogger( App.class );
/**
* Entry point of the run-virt QEMU plugin (command line tool).
*
* @param args command line arguments passed to the run-virt QEMU plugin (command line tool).
*/
public static void main( String[] args )
{
// initialize logging
BasicConfigurator.configure();
// parse command line arguments
CommandLineArgs cmdLn = new CommandLineArgs();
try {
cmdLn.parseCmdLnArgs( args );
} catch ( CommandLineArgsException e ) {
LOGGER.error( "Parsing of command line arguments failed: " + e.getLocalizedMessage() );
App.printUsage( cmdLn );
System.exit( 1 );
}
// show help if 'help' command line option is set
if ( cmdLn.isHelpAquired() ) {
App.printUsage( cmdLn );
System.exit( 0 );
}
// print command line arguments for debugging purposes
App.printCmdLnArgs( cmdLn );
// return with successful exit code
System.exit( 0 );
}
/**
* Helper utility to print the run-virt QEMU plugin help text.
*
* @param cmdLn parsed command line arguments.
*/
public static void printUsage( CommandLineArgs cmdLn )
{
final String newLine = System.lineSeparator();
final String fullAppDesc = newLine + App.APP_DESC + newLine + newLine;
final String fullAppInfo = newLine + App.APP_INFO;
cmdLn.printHelp( App.APP_NAME, fullAppDesc, fullAppInfo );
}
/**
* Helper utility to log the run-virt QEMU plugin's submitted command line arguments.
*
* @param cmdLn parsed command line arguments.
*
* @implNote This method is intended to be used for debugging purposes.
*/
public static void printCmdLnArgs( CommandLineArgs cmdLn )
{
// determine length of longest command line option
int longOptionLengthMax = 0;
for ( CmdLnOption option : CmdLnOption.values() ) {
// store length of current long option
final int longOptionLength = option.getLongOption().length();
// if length is longer than every length before, store this length as longest length
if ( longOptionLength > longOptionLengthMax ) {
longOptionLengthMax = longOptionLength;
}
}
LOGGER.debug( "Command line arguments: --------------" );
for ( CmdLnOption option : CmdLnOption.values() ) {
final String paddedLongOption = String.format( "%-" + longOptionLengthMax + "s", option.getLongOption() );
final String longOptionArgument;
// only request and log argument if option has an command line argument
if ( option.hasArgument() ) {
longOptionArgument = cmdLn.getArgument( option );
} else {
longOptionArgument = new String( "[option has no argument]" );
}
LOGGER.debug( "\t" + paddedLongOption + ": " + longOptionArgument );
}
}
}
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