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Re: Shadowfs

Am Fre, 04 Aug 2000 14:28:26 Juli-Manel Merino Vidal Sie:
> Hi all,
> I've been reading about Hurd and found in several places the "shadow
> filesystem", but what's that ?

It's a good idea: Shadow several filesystems over each other, so you
see the content of all of them in a single directory tree:

fs1: /usr/bin/foo
fs2: /usr/bin/bar


With sufficient options to specify which fs should be "on top" (override
other fs) and where to put writes to (only the top level, the level from 
the file comes etc), this can be used in manifold ways:

Shadowing an empty partition over a CD-ROM to get a copy-on-write system
(useful for live-filesystems).
Shadowing software installed in some weird tree (~/opt for example) over
the root filesystem to "install" it.
Shadowing some user filesystem over the root filesystem and boot in it
(to get a subhurd without duplicating the parents files)


However, as with all useful things, it is not implemented yet :)


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