On 20031212.1411, Bob Miller said ...

> T. Joseph Carter wrote:
> 
> > The whole idea of a filesystem in userspace is pretty hackish, so I won't
> > ask what's wrong with it.  Instead, I'll ask: What would be a better way
> > to do it?

A blog I read had a lot to say on this very question:
http://simon.incutio.com/archive/2003/12/10/pythonFilesystems

Copy and pasted below...

LUFS-Python provides a relatively simple API for implementing new Linux
filesystems in pure Python. You install the package, write a class
implementing methods for handling filesystem operations such as creating
a directory, opening/reading/writing/closing a file, creating symlinks
etc and finally mount your new filesystem with some special arguments to
the mount command.

At first glance, this is a bit of a gimmick - why would you want to
write your own filesystem in the first place? We've been talking about
this at work and came up with a few ideas. How about a filesystem where
HTML files saved in a certain directory were instantly run through
HTMLTidy and converted in to valid XHTML ? Or a custom network
filesystem that saves files on a remote server using GnuPG to encrypt
them before transfer? How about a read-only filesystem that lets you
browse the contents of a MySQL database? Just imagine being able to use
tools such as grep and find to search your database. A module that maps
someone elses public web server to your own filesystem, making mirroring
as easy as running a recursive cp command. A filesystem that updates a
swish-e full-text index every time a file is saved to it - years before
Microsoft release Longhorn. The possibilities are endless.

Here's a really fun idea: a filesystem that implements a dynamic
website. Instead of using tools like mod_python to dynamically create
pages, implement a filesystem that dynamically creates HTML files as
they are requested and set up a stock Apache install with the dynamic
filesystem as the document root. Then point ProFTPD at it so you can log
in via FTP and mess with your content dynamically. We're thinking about
bulding an FTP interface to our new database driven CMS, but we could
just build a filesystem interface and point our FTP server straight at
it.

I'm sure there are performance and stability issues that make most of
the above more trouble than it's worth, but I think you'll agree it's a
pretty exciting technology.
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