Function NewRootNodeWithOptions

utils/merkletrie/filesystem/node.go:72–93

NewRootNodeWithOptions returns the root node based on a given billy.Filesystem with options to set an index. Providing an index enables the metadata-first comparison optimization while correctly handling the "racy git" condition. If no index is provided, the function works without the optimization.

(
	fs billy.Filesystem,
	submodules map[string]plumbing.Hash,
	options Options,
)

//
// Reference: https://git-scm.com/docs/racy-git
func NewRootNodeWithOptions(
	fs billy.Filesystem,
	submodules map[string]plumbing.Hash,
	options Options,
) noder.Noder {
	var idxMap map[string]*index.Entry

	if options.Index != nil {
		idxMap = make(map[string]*index.Entry, len(options.Index.Entries))
		for _, entry := range options.Index.Entries {
			idxMap[entry.Name] = entry
		}
	}

	return &node{
		fs:         fs,
		submodules: submodules,
		idx:        options.Index,
		idxMap:     idxMap,
		isDir:      true,
	}
}

// Hash the hash of a filesystem is the result of concatenating the computed
// plumbing.Hash of the file as a Blob and its plumbing.FileMode; that way the