mu      sync.Mutex // protects nssConf
	nssConf *nssConf
}

func getSystemNSS() *nssConf {
	nssConfig.tryUpdate()
	nssConfig.mu.Lock()
	conf := nssConfig.nssConf
	nssConfig.mu.Unlock()
	return conf
}

// init initializes conf and is only called via conf.initOnce.
func (conf *nsswitchConfig) init() {
	conf.nssConf = parseNSSConfFile("/etc/nsswitch.conf")
	conf.lastChecked = time.Now()

	// than fallbackOrder to use the Go resolver with that order.

	dnsConf = getSystemDNSConfig()

	if canUseCgo && dnsConf.err != nil && !errors.Is(dnsConf.err, fs.ErrNotExist) && !errors.Is(dnsConf.err, fs.ErrPermission) {
		// We can't read the resolv.conf file, so use cgo if we can.
		return hostLookupCgo, dnsConf
	}

	if canUseCgo && dnsConf.unknownOpt {
		// We didn't recognize something in resolv.conf,

        javaLibrary.parsedIvy.dependencies['org:optionaldep-g1:1.0'].hasConf('optionalFeature1RuntimeElements->default')
        javaLibrary.parsedIvy.dependencies['org:optionaldep1-g2:1.0'].hasConf('optionalFeature2RuntimeElements->default')
        javaLibrary.parsedIvy.dependencies['org:optionaldep2-g2:1.0'].hasConf('optionalFeature2RuntimeElements->default')

        and:

	order, _ = cnf.addrLookupOrder(nil, "192.0.2.1")
	if order != hostLookupCgo {
		t.Errorf("addrLookupOrder returned: %v, want cgo", order)
	}

}

func setSystemNSS(nss *nssConf, addDur time.Duration) {
	nssConfig.mu.Lock()
	nssConfig.nssConf = nss
	nssConfig.mu.Unlock()
	nssConfig.acquireSema()
	nssConfig.lastChecked = time.Now().Add(addDur)
	nssConfig.releaseSema()
}

func TestSystemConf(t *testing.T) {

                @OutputFile
                abstract RegularFileProperty getOutputFile()

                @Internal
                Set<File> classpath = project.configurations["myconf"].files
                BadTask() {
                    println("creating bad task")
                }
                @TaskAction
                void printIt() {

            dependency('org', 'optionaldep', '1.0')
            noMoreDependencies()
        }
        javaLibrary.parsedIvy.dependencies.size() == 1
        javaLibrary.parsedIvy.dependencies['org:optionaldep:1.0'].hasConf('featureRuntimeElements->default')

        and:
        resolveArtifacts(javaLibrary) { expectFiles "publishTest-1.9.jar" }
        resolveApiArtifacts(javaLibrary) { expectFiles "publishTest-1.9.jar" }

                @OutputFile
                abstract RegularFileProperty getOutputFile()

                @Internal
                Set<File> classpath = project.configurations["myconf"].files
                BadTask() {
                    println("creating bad task")
                }
                @TaskAction
                void printIt() {

    String org
    String module
    String revision
    String revisionConstraint
    Set<String> confs
    String transitive
    Collection<IvyDescriptorDependencyExclusion> exclusions = []

    boolean hasConf(String conf) {
        this.confs.contains(conf)
    }

    boolean transitiveEnabled() {
        transitive != 'false'
    }

    boolean hasExcludes() {
        exclusions
    }

                    DependencyScopeConfiguration myConf = project.getConfigurations().dependencyScope("myConf").get();
                    DependencyScopeConfiguration myOtherConf = project.getConfigurations().dependencyScope("myOtherConf").get();

                    // create and wire the custom dependencies extension's dependencies to these global configurations

        assert this.ext == ext
        assert this.type == type
        assert this.conf == conf
        assert this.classifier == classifier
    }

    IvyDescriptorArtifact hasConf(def conf) {
        assert this.conf == conf
        return this
    }

    IvyDescriptorArtifact hasType(def type) {
        assert this.type == type
        return this
    }