A file system that allows overlaying one AbstractFileSystem on top of another. More...

#include <VirtualFileSystem.h>

Inheritance diagram for clang::vfs::OverlayFileSystem:

Collaboration diagram for clang::vfs::OverlayFileSystem:

Public Types
typedef FileSystemList::reverse_iterator	iterator
Public Member Functions
	OverlayFileSystem (IntrusiveRefCntPtr< FileSystem > Base)
void	pushOverlay (IntrusiveRefCntPtr< FileSystem > FS)
	Pushes a file system on top of the stack.
llvm::ErrorOr< Status >	status (const Twine &Path) override
	Get the status of the entry at `Path`, if one exists.
llvm::ErrorOr< std::unique_ptr < File > >	openFileForRead (const Twine &Path) override
	Get a `File` object for the file at `Path`, if one exists.
directory_iterator	dir_begin (const Twine &Dir, std::error_code &EC) override
	Get a directory_iterator for `Dir`.
iterator	overlays_begin ()
	Get an iterator pointing to the most recently added file system.
iterator	overlays_end ()
	Get an iterator pointing one-past the least recently added file system.

Detailed Description

A file system that allows overlaying one AbstractFileSystem on top of another.

Consists of a stack of >=1 FileSystem objects, which are treated as being one merged file system. When there is a directory that exists in more than one file system, the OverlayFileSystem contains a directory containing the union of their contents. The attributes (permissions, etc.) of the top-most (most recently added) directory are used. When there is a file that exists in more than one file system, the file in the top-most file system overrides the other(s).

Definition at line 218 of file VirtualFileSystem.h.