Package common defines code common to the union and the policies These need to be defined in a separate package to avoid import loops.

Package policy provides utilities for the union implementation.

Package upstream provides utility functionality to union.

NewFs constructs an Fs from the path.

Directory describes a union Directory This is a wrapped object contains all candidates.

Fs represents a union of upstreams.

Object describes a union Object This is a wrapped object which returns the Union Fs as its parent.

The Errors type wraps a slice of errors.