Description:

The Plastic File System is an LD_PRELOAD module for manipulating what
the file system looks like for programs. This allows virtual file
systems to exist in user space, without kernel hacks or modules.

A number of filters exist for a number of different use-cases, including

chroot - simulate the effects of a chroot call
dos - simulate a DOS 8.3 filesystem
downcase - make file names appear in lower-case
log - transparently log file system access (like strace)
nocase - make filenames case-insensitive
shortname - simulate file systems with shorter filenames
smartlink - expand environment variables in symbolic links
titlecase - make filenames appear in title-case
upcase - make filenames appear in upper-case
viewpath - union all the directory trees in a view path (unionfs)

These filters may be piped on into the next to form powerful filter
combinations.

It is possible to extend PlasticFS with loadable file system filter
modules from shared object files.