in src/main/java/org/apache/maven/shared/verifier/Verifier.java [121:138]
public Verifier( String basedir )
throws VerificationException
{
this.basedir = basedir;
this.forkMode = System.getProperty( "verifier.forkMode" );
findLocalRepo( settingsFile );
this.mavenHome = System.getProperty( "maven.home" );
setForkMode();
useWrapper = Files.exists( Paths.get( getBasedir(), "mvnw" ) );
this.defaultCliArguments = DEFAULT_CLI_ARGUMENTS.clone();
}