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Re: [PATCH] First step for issue #3702 (case-only renames on Windows) - now blocked by libsvn_client

From: Daniel Shahaf <d.s_at_daniel.shahaf.name>
Date: Mon, 25 Apr 2011 17:56:36 +0300

Johan Corveleyn wrote on Mon, Apr 25, 2011 at 01:08:24 +0200:
> 2011/4/22 Branko ─îibej <brane_at_e-reka.si>:
> > Meh. For now, just hack a special case so that committing one half of a
> > case-only rename will automagically commit the other half. Shouldn't be
> > too hard to do, and it's almost impossible to do the wrong thing --
> > after all, you're constrained by a) staying in the same directory, and
> > b) both halves of a rename resolving to the same on-disk file on a
> > case-insensitive file system.
> Sounds like another option. A small change here and there to make
> case-only renames work specifically (and not solve the more general
> problem of fixing path-guessing via wc-db or truepaths).
> The fact of the matter is that, for sane setups/companies,
> case-clashes are going to be really rare, *except when doing case-only
> renames*. A repository holding 'Foo', 'FOo' and 'FOO' would be a
> repository that's un-checkoutable on a case-insensitive filesystem

Un-checkoutable at depth >= svn_depth_files (assuming those 'foo' are
files rather than directories).

It makes perfect sense to me to have, say, both trunk/config.txt and
trunk/CONFIG.txt, and tell people to do

        svn up --set-depth=exclude config.txt # remove the uppercase one
        && svn up --set-depth=infinity config.txt # pull the lowercase one
for example. It's a very cheap and effective way of ensuring at most
one of the conflicting config.txt files is present.

"Case-insensitive filesystems: it's not a bug, it's a feature."

I'm not going to guess whether (and how many) people use Subversion this
way; I'm only saying that the above workflow allows for coexisting
case-clashing files and is supported by our released code.
> anyway. So I'd expect companies that have to support case-insensitive
> clients to keep real case-clashes out of their repository (or fix them
> as soon as they are discovered).
> So maybe "case-only rename" (and perhaps "case-only replace"
> (delete+add w/o history)) is the only use-case we need to go for. But
> apart from commit, we should maybe also make "revert" possible, as
> well as adding to and removing from changelists ... (hm, commit would
> be the main thing I guess, revert can always be done in two steps
> (revert the add, then the delete), changelists ... oh well).
> I'd love to hear some more input ...
> Cheers,
> -- 
> Johan
> [1] http://subversion.tigris.org/issues/show_bug.cgi?id=3865 ('svn' on
> Windows cannot address scheduled-for-delete file, if another file
> differing only in case is present on disk)
Received on 2011-04-25 16:57:18 CEST

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