How to use

getSystemEnvVars

method

in

org.apache.maven.shared.utils.cli.CommandLineUtils

  private FixedStringSearchInterpolator createEnvInterpolator() {
    PrefixedPropertiesValueSource envProps = new PrefixedPropertiesValueSource(Collections.singletonList("env."),
                                          CommandLineUtils.getSystemEnvVars(false), true );
    return FixedStringSearchInterpolator.create( envProps );
  }
}

/**
 * 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. <code>getSystemEnvVars().get("path")</code>
 * and <code>getSystemEnvVars().get("PATH")</code> 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 <code>null</code>.
 * @see System#getenv() System.getenv() API, new in JDK 5.0, to get the same result
 *      <b>since 2.0.2 System#getenv() will be used if available in the current running jvm.</b>
 */
public static Properties getSystemEnvVars()
{
  return getSystemEnvVars( !Os.isFamily( Os.FAMILY_WINDOWS ) );
}

private void findDefaultMavenHome()
  throws VerificationException
{
  defaultClasspath = System.getProperty( "maven.bootclasspath" );
  defaultClassworldConf = System.getProperty( "classworlds.conf" );
  defaultMavenHome = System.getProperty( "maven.home" );
  if ( defaultMavenHome == null )
  {
    Properties envVars = CommandLineUtils.getSystemEnvVars();
    defaultMavenHome = envVars.getProperty( "M2_HOME" );
  }
  if ( defaultMavenHome == null )
  {
    File f = new File( System.getProperty( "user.home" ), "m2" );
    if ( new File( f, "bin/mvn" ).isFile() )
    {
      defaultMavenHome = f.getAbsolutePath();
    }
  }
}

/**
 * Add system environment variables
 */
public void addSystemEnvironment()
{
  Properties systemEnvVars = CommandLineUtils.getSystemEnvVars();
  for ( Object o : systemEnvVars.keySet() )
  {
    String key = (String) o;
    if ( !envVars.containsKey( key ) )
    {
      addEnvironment( key, systemEnvVars.getProperty( key ) );
    }
  }
}

private FixedStringSearchInterpolator createEnvInterpolator()
{
  PrefixedPropertiesValueSource envProps = new PrefixedPropertiesValueSource( Collections.singletonList( "env." ),
                                        CommandLineUtils.getSystemEnvVars(
                                          false ), true );
  return FixedStringSearchInterpolator.create( envProps );
}