cmd_blob_store_fs

type BlobBuilder interface {
	Stream() *os.File
	Commit() (string, error)
	Abort() error
}

type BlobReader interface {
	Stream() *os.File
	Close()
}

type Repo interface {
	Create(id gunkan.BlobId) (BlobBuilder, error)
	Open(blobId string) (BlobReader, error)
	Delete(blobId string) error
}