private static final Set<String> IMPORTANT_NON_STANDARD_PROPERTIES = Collections.singleton("java.runtime.version");

    private static final SystemProperties INSTANCE = new SystemProperties();

    public static SystemProperties getInstance() {
        return INSTANCE;
    }

    private SystemProperties() {
    }

    public String getLineSeparator() {
        return System.getProperty("line.separator");
    }

    /**

    private final SystemProperties systemProperties;
    private final Map<String, String> environment;

    @Inject
    public DefaultToolchainConfiguration() {
        this(OperatingSystem.current(), SystemProperties.getInstance(), System.getenv());
    }

    @VisibleForTesting
    DefaultToolchainConfiguration(OperatingSystem os, SystemProperties systemProperties, Map<String, String> environment) {

        this.currentDir = currentDir;
        this.logLevel = logLevel;
        this.useDaemon = useDaemon;
        assert systemProperties != null;
        assert envVariables != null;
        this.systemProperties = new HashMap<String, String>();
        GUtil.addToMap(this.systemProperties, systemProperties);
        this.envVariables = new HashMap<String, String>(envVariables);
        this.injectedPluginClasspath = injectedPluginClasspath;
    }

    private final ProviderFactory providerFactory;
    private final SystemProperties systemProperties;

    @Inject
    public ProviderBackedToolchainConfiguration(ProviderFactory providerFactory) {
        this(providerFactory, SystemProperties.getInstance());
    }

    ProviderBackedToolchainConfiguration(ProviderFactory providerFactory, SystemProperties systemProperties) {
        this.providerFactory = providerFactory;

        ParsedCommandLine options = parser.parse(args);

        Properties systemProperties = System.getProperties();
        systemProperties.putAll(converter.convert(options, new HashMap<String, String>()));

        File gradleUserHome = gradleUserHome(options);

        addSystemProperties(systemProperties, gradleUserHome, rootDir);

        Logger logger = logger(options);

        String javaVendorVersion = systemProperties.get("java.vm.version");
        String osName = systemProperties.get("os.name");
        String osVersion = systemProperties.get("os.version");
        String osArch = systemProperties.get("os.arch");
        return String.format("%s/%s (%s;%s;%s) (%s;%s;%s)", appName, appVersion, osName, osVersion, osArch, javaVendor, javaVersion, javaVendorVersion);
    }

package org.gradle.jvm.toolchain.internal

import org.gradle.internal.SystemProperties
import org.gradle.internal.os.OperatingSystem
import spock.lang.Specification

class DefaultToolchainConfigurationTest extends Specification {
    private SystemProperties systemProperties = Stub()
    private Map<String, String> environment = [:]

    def setup() {
        systemProperties.getUserHome() >> "/home/user"
    }

        Map<String, String> systemProperties = new HashMap<String, String>();
        GUtil.addToMap(systemProperties, jvmOptions.getMutableSystemProperties());
        return systemProperties;
    }

    public Map<String, String> getEffectiveSystemProperties() {
        Map<String, String> systemProperties = new HashMap<String, String>();
        GUtil.addToMap(systemProperties, System.getProperties());

        return setSystemProperties(toMap(systemProperties));
    }

    /**
     * Sets the system properties to use for interpolation and profile activation. The system properties are collected
     * from the runtime environment like {@link System#getProperties()} and environment variables.
     *
     * @param systemProperties The system properties, may be {@code null}.

            this.inactiveProfileIds = inactiveProfileIds;
            return this;
        }

        public ModelBuilderRequestBuilder systemProperties(Map<String, String> systemProperties) {
            this.systemProperties = systemProperties;
            return this;
        }

        public ModelBuilderRequestBuilder userProperties(Map<String, String> userProperties) {