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    Filesys::POSIX -- A real, in-memory filesystem written entirely in Perl
    By Erin Schönhals <wrath@cpan.org>


        use strict;
        use warnings;

        use Filesys::POSIX;
        use Filesys::POSIX::Mem;
        use Filesys::POSIX::Real;

        my $fs = Filesys::POSIX->new(Filesys::POSIX::Mem->new);

        $fs->mkdir('/Perl Rules!');
        $fs->mount(Filesys::POSIX::Real->new, '/Perl Rules!',
            'special'   => 'real:/mnt/42',
            'noatime'   => 1
        );


p2









                                    But why?











p3









                        I needed real filesystem semantics
                            in a place that had none.










p4









                                But again, why?











p5








                                I don't know.
                        But it turned out to be really
                                bloody useful.










p6









                        Each filesystem object has its own
                                unique namespace










p7








                            Set any ownerships and
                        permissions that I would want











p8








                        Mount parts of filesystem devices
                       in any number of filesystem objects











p9








                                Map portions of
                              the real filesystem











p10








                            Have my own private file
                                  descriptors











p11








                                And even generate
                           tarballs from these things











p12








                                    Inodes












p13








                                Mount points












p14








                                Directory entries












p15








                                Path resolution












p16








                                  $fs->stat()












p17








                            Different filesystem types,
                                  same semantics











p18








                        What does the code look like...?












p19








                                [Switch windows!]












p20








                              That's nice, but...












p21








                                Write a FUSE module!












p22








                            Make your own perverse /proc
                                    filesystem!











p23








                            Serve the same content, but
                    with different views and representations!











p24








                                Anything, really












p25








                                  Don't be shy.












p26








                                    ~ fin ~












p27