overlay

Documentation

Index

• type Overlay
  • func New(layers ...http.FileSystem) *Overlay
  • func (o *Overlay) Open(p string) (http.File, error)

Types

type Overlay

type Overlay struct {
	// contains filtered or unexported fields
}

Overlay is a read-only filesystem formed with a list of layers representing diffs. It is designed to behave like a filesystem such as those used in containers. The layers are given uppermost first (at index 0).

https://www.kernel.org/doc/Documentation/filesystems/overlayfs.txt

is the inspiration for OCI image layers:

> An overlay filesystem combines two filesystems - an 'upper' filesystem > and a 'lower' filesystem. When a name exists in both filesystems, the > object in the 'upper' filesystem is visible while the object in the > 'lower' filesystem is either hidden or, in the case of directories, > merged with the 'upper' object.

func New

func New(layers ...http.FileSystem) *Overlay

New constructs an overlay filesystem given the layers

func (*Overlay) Open

func (o *Overlay) Open(p string) (http.File, error)

Open implements http.FileSystem#Open for the overlay filesystem