20040612 [CMcC]:

[[package vfs::cache]] is a vfs::add with the additional property that writes go to the top level directory.

[[package vfs::add]] allows one to stack directories together translucently, as if each directory were mounted over those below it, allowing the unique files below it to appear as if in the single virtual directory, giving the perfect illusion of a single directory composed of the sum of all of the stacked directories.

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This code is at http://sharedtech.dyndns.org/~colin/cachevfs.tar.gz and contains man pages, tests and everything necessary to place it in the [VFS] distribution.