Virtual Filesystems for Rust

This crate defines and implements various virtual filesystems for Rust. It's loosely inspired by the vfs crate with a focus on conformity with std.

virtual-fs has the following FileSystems implemented out of the box:

• PhysicalFS: A read-write physical filesystem mounted at a directory. Path traversal outside the root is permitted.
• SandboxedPhysicalFS: A read-write physical filesystem that guards against traversal through backtracking and symbolic link traversal.
• MemoryFS: A read-write in-memory filesystem.
• RocFS: A "read-only collection" filesystem. This filesystem is similar to OverlayFS, but is read-only. This filesystem searches filesystems in mount-order for files, allowing multiple filesystems to be mounted at once.
• MountableFS: A read-write filesystem that supports mounting other filesystems at given paths.
• ScopedFS: A read-write filesystem that restricts access to a subdirectory of an inner filesystem, rejecting any path traversal that would escape the scope.
• ZipFS: A read-only filesystem that mounts a ZIP archive, backed by the zip crate.
• TarFS: A read-only filesystem that mounts a Tarball, backed by the tar crate.