text: // Package filesystem is a storage backend base on filesystems
  package filesystem
  
  import (
  	"gopkg.in/src-d/go-git.v4/storage/filesystem/dotgit"
  
  	"gopkg.in/src-d/go-billy.v4"
  )
  
  // Storage is an implementation of git.Storer that stores data on disk in the
  // standard git format (this is, the .git directory). Zero values of this type
  // are not safe to use, see the NewStorage function below.
  type Storage struct {
  	fs  billy.Filesystem
  	dir *dotgit.DotGit
  
  	ObjectStorage
  	ReferenceStorage
  	IndexStorage
  	ShallowStorage
  	ConfigStorage
  	ModuleStorage
  }
  
  // NewStorage returns a new Storage backed by a given `fs.Filesystem`
  func NewStorage(fs billy.Filesystem) (*Storage, error) {
  	dir := dotgit.New(fs)
  	o, err := NewObjectStorage(dir)
  	if err != nil {
  		return nil, err
  	}
  
  	return &Storage{
  		fs:  fs,
  		dir: dir,
  
  		ObjectStorage:    o,
  		ReferenceStorage: ReferenceStorage{dir: dir},
  		IndexStorage:     IndexStorage{dir: dir},
  		ShallowStorage:   ShallowStorage{dir: dir},
  		ConfigStorage:    ConfigStorage{dir: dir},
  		ModuleStorage:    ModuleStorage{dir: dir},
  	}, nil
  }
  
  // Filesystem returns the underlying filesystem
  func (s *Storage) Filesystem() billy.Filesystem {
  	return s.fs
  }
  
  func (s *Storage) Init() error {
  	return s.dir.Initialize()
  }
  