Map<String, String> props = request.getUserProperties();
        if (props.containsKey(REVISION_PROPERTY)) {
            modelProperties.put(REVISION_PROPERTY, props.get(REVISION_PROPERTY));
        }
        if (props.containsKey(CHANGELIST_PROPERTY)) {
            modelProperties.put(CHANGELIST_PROPERTY, props.get(CHANGELIST_PROPERTY));
        }
        if (props.containsKey(SHA1_PROPERTY)) {

                request.setRemoteRepositories(req.getRemoteRepositories());
            }
        } else {
            Properties props = new Properties();
            EnvironmentUtils.addEnvVars(props);
            props.putAll(System.getProperties());
            request.setSystemProperties(props);
        }

        return request;
    }

    @SuppressWarnings("unchecked")

        Map<String, String> props = new HashMap<>();
        if (recessive != null) {
            props.putAll(recessive);
        }
        if (dominant != null) {
            props.putAll(dominant);
        }
        return props;
    }

    private Artifact getRelocation(

            Artifact artifact = result.getArtifact();
            Map<String, String> props = new HashMap<>(artifact.getProperties());
            props.put(ArtifactProperties.DOWNLOAD_URL, downloadUrl);
            result.setArtifact(artifact.setProperties(props));
        }
    }

     * variable lookup.
     *
     * @param props The properties to add the environment variables to, may be {@code null}.
     */
    public static void addEnvVars(Properties props) {
        if (props != null) {
            if (envVars == null) {
                Properties tmp = new Properties();

        osActivation.setOs( activationOS );

        osActivated.setActivation( osActivation );

        Properties props = System.getProperties();
        ProfileActivationContext ctx = new ProfileActivationContext( props, false );

        ProfileManager profileManager = new DefaultProfileManager( getContainer(), props );

        profileManager.addProfile( osActivated );

        List active = profileManager.getActiveProfiles( null );

    }

    private String loadMavenVersion() {
        Properties props = new Properties();

        String resource = "META-INF/maven/org.apache.maven/maven-core/pom.properties";

        try (InputStream is = DefaultRuntimeInformation.class.getResourceAsStream("/" + resource)) {
            if (is != null) {
                props.load(is);
            } else {

                if (error != null) {
                    props.setProperty(key + ERROR_KEY_SUFFIX, error);
                } else {
                    props.remove(key + ERROR_KEY_SUFFIX);
                }

                getLogger().debug("Writing resolution-state to: " + touchfile);
                channel.truncate(0);

/**
 * @since 3.2.3
 */
public class SystemProperties {
    /**
     * Thread-safe System.properties copy implementation.
     */
    public static void addSystemProperties(Properties props) {
        props.putAll(getSystemProperties());
    }

    /**
     * Returns a copy of {@link System#getProperties()} in a thread-safe manner.
     *

        this(container, null);
    }

    /**
     * the properties passed to the profile manager are the props that
     * are passed to maven, possibly containing profile activator properties
     *
     */
    public DefaultProfileManager(PlexusContainer container, Properties props) {
        try {
            this.profileSelector = container.lookup(ProfileSelector.class);