private final Node rootNode;

        PrefixFileSet(File rootDir) {
            this(toAbsolutePath(rootDir));
        }

        PrefixFileSet(String rootPath) {
            String path = removeTrailingSeparator(rootPath);
            this.rootNode = new Node(path);
        }

        PrefixFileSet(Node rootNode) {
            this.rootNode = rootNode;
        }

        false
    )

    def "result can be read multiple times"() {
        def rootNode = rootNode(1, "org", "root", "1.0")
        builder.start(rootNode)
        builder.visitNode(rootNode)
        builder.finish(rootNode)

        when:
        def result = builder.getResolutionResult([] as Set)

        then:
        with(result.rootSource.get()) {

        def rootNode = Mock(FileSystemNode)
        def hierarchy = DefaultSnapshotHierarchy.from(rootNode, CASE_SENSITIVE)

        when:
        def hasDescendants = hierarchy.hasDescendantsUnder("/")
        then:
        hasDescendants
        1 * rootNode.hasDescendants() >> true
        0 * _
    }

    def 'rootSnapshotsUnder can stream the root'() {
        def rootNode = Mock(FileSystemNode)

        entryPointsConsumer.accept(new EntryPoints(
            toClassNode(libraries, rootNode(AccessorKind.library)),
            toClassNode(versions, rootNode(AccessorKind.version, "versions")).parent,
            toClassNode(bundles, rootNode(AccessorKind.bundle, "bundles")).parent,
            toClassNode(plugins, rootNode(AccessorKind.plugin, "plugins")).parent
        ));
    }

    private final Map<ModuleIdentifier, ModuleResolveState> modules;
    private final Map<NodeIdentifier, NodeState> nodes;
    private final Map<SelectorCacheKey, SelectorState> selectors;
    private final RootNode root;
    private final ComponentIdGenerator idGenerator;
    private final DependencyToComponentIdResolver idResolver;
    private final ComponentMetaDataResolver metaDataResolver;
    private final Deque<NodeState> queue;

	if pathOnly {
		base.Fatalf("cannot find %q in PATH", gotoolchain)
	}

	// Set up modules without an explicit go.mod, to download distribution.
	modload.Reset()
	modload.ForceUseModules = true
	modload.RootMode = modload.NoRoot
	modload.Init()

	// Download and unpack toolchain module into module cache.
	// Note that multiple go commands might be doing this at the same time,

}

func RunVendor(ctx context.Context, vendorE bool, vendorO string, args []string) {
	if len(args) != 0 {
		base.Fatalf("go: 'go mod vendor' accepts no arguments")
	}
	modload.ForceUseModules = true
	modload.RootMode = modload.NeedRoot

	loadOpts := modload.PackageOpts{
		Tags:                     imports.AnyTags(),
		VendorModulesInGOROOTSrc: true,
		ResolveMissingImports:    true,
		UseVendorAll:             true,

// in the current directory or parent directories.
//
// See golang.org/issue/40276 for details and rationale.
func installOutsideModule(ctx context.Context, args []string) {
	modload.ForceUseModules = true
	modload.RootMode = modload.NoRoot
	modload.AllowMissingModuleImports()
	modload.Init()
	BuildInit()

	// Load packages. Ignore non-main packages.
	// Print a warning if an argument contains "..." and matches no main packages.