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RE: hard links (was Re: Subversion != your filesystem (was mv != (cp &&rm)))

From: Bill Tutt <rassilon_at_lyra.org>
Date: 2001-11-28 21:39:03 CET

Actually, the use case you site is also one of the use cases folks who
support client views site btw.

Bill

--
Bunnies aren't just cute like everybody supposes.
They got their hoppy legs and twitchy little noses.
And what's with all the carrots, 
What do they need such good eyesight for anyway?
From: Greg Hudson [mailto:ghudson@MIT.EDU] 
 
On Wed, 2001-11-28 at 13:20, Karl Fogel wrote:
> We don't have any plans for hard-link support in the filesystem, as
> far as I know, actually.  It's dangerous in Subversion for the same
> reasons its dangerous in a regular filesystem -- we need to prevent
> cycles.
We can probably prevent cycles.  But supporting hard links raises some
big cans of worms, because we have to map our semantics onto a working
directory somehow.  How do we represent hard-linked files in the working
directory?  Copies?  Hard links?  Symbolic links?  Hard links won't work
for directories (or in AFS, if the two linked files are in different
directories), and neither hard links nor symbolic links will work on
non-Unix platforms.  If we represent them as copies, we run into a whole
bunch of commit-time error cases, like what happens if a user changes
both copies and then tries to commit (or changes both copies and then
commits one copy, and we have to try to propagate the change back to the
other copy in the working dir).
I can see some use cases for hard links (example: if apr, apache, and
subversion all lived in the same repository, apr could exist inside both
the apache and subversion source directories and never get out of sync
with the master copy), but I think it's just too complicated on balance.
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Received on Sat Oct 21 14:36:49 2006

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