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From: Jeff King <peff@peff.net>
To: Stefan Beller <sbeller@google.com>
Cc: Brandon Williams <bmwill@google.com>, git <git@vger.kernel.org>
Subject: Re: [PATCH 2/2] submodule: munge paths to submodule git directories
Date: Wed, 29 Aug 2018 17:03:48 -0400
Message-ID: <20180829210348.GA29880@sigill.intra.peff.net> (raw)
In-Reply-To: <CAGZ79kZv4BjRq=kq_1UeT2Kn38OZwYFgnMsTe6X_WP41=hBtSQ@mail.gmail.com>

On Wed, Aug 29, 2018 at 11:10:51AM -0700, Stefan Beller wrote:

> > Do you care about case-folding issues (e.g., submodules "FOO" and "foo"
> > colliding)?
> 
> I do. :(
> 
> 2d84f13dcb6 (config: fix case sensitive subsection names on writing, 2018-08-08)
> explains the latest episode of case folding with submodules involved.
> 
> > I'm OK if the answer is "no", but if you do want to deal with it, the
> > time is probably now.
> 
> Good point. But as soon as we start discussing case sensitivity, we
> are drawn down the rabbit hole of funny file names. (Try naming
> a submodule "CON1" and obtain it on Windows for example)
> So we would need to have a file system specific encoding function for
> submodule names, which sounds like a maintenance night mare.

Hmph. I'd hoped that simply escaping metacharacters and doing some
obvious case-folding would be enough. And I think that would cover most
accidental cases. But yeah, Windows reserved names are basically
indistinguishable from reasonable names. They'd probably need
special-cased.

OTOH, I'm not sure how we handle those for entries in the actual tree.
Poking around git-for-windows/git, I think it uses the magic "\\?"
marker to tell the OS to interpret the name literally.

So I wonder if it might be sufficient to just deal with the more obvious
folding issues. Or as you noted, if we just choose lowercase names as
the normalized form, that might also be enough. :)

> So if I was thinking in the scheme presented above, we could just
> have another rule that is
> 
>   [A-Z]  -> _[a-z]
> 
> (lowercase capital letters and escape them with an underscore)

Yes, that makes even the capitalized "CON" issues go away. It's not a
one-to-one mapping, though ("foo-" and "foo_" map to the same entity).

If we want that, too, I think something like url-encoding is fine, with
the caveat that we simply urlencode _more_ things (i.e., anything not in
[a-z_]).

-Peff

  reply index

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-07 23:06 [RFC] " Brandon Williams
2018-08-07 23:25 ` Jonathan Nieder
2018-08-08  0:14 ` Junio C Hamano
2018-08-08 22:33 ` [PATCH 0/2] munge submodule names Brandon Williams
2018-08-08 22:33   ` [PATCH 1/2] submodule: create helper to build paths to submodule gitdirs Brandon Williams
2018-08-08 23:21     ` Stefan Beller
2018-08-09  0:45       ` Brandon Williams
2018-08-10 21:27     ` Junio C Hamano
2018-08-10 21:45       ` Brandon Williams
2018-08-08 22:33   ` [PATCH 2/2] submodule: munge paths to submodule git directories Brandon Williams
2018-08-09 21:26     ` Jeff King
2018-08-14 18:04       ` Brandon Williams
2018-08-14 18:57         ` Jonathan Nieder
2018-08-14 21:08           ` Stefan Beller
2018-08-14 21:12             ` Jonathan Nieder
2018-08-14 22:34               ` Stefan Beller
2018-08-16  2:34                 ` Jonathan Nieder
2018-08-16  2:39                   ` Stefan Beller
2018-08-16  2:47                     ` Jonathan Nieder
2018-08-16 17:34                       ` Brandon Williams
2018-08-16 18:19                       ` [PATCH] submodule: add config for where gitdirs are located Brandon Williams
2018-08-20 22:03                         ` Junio C Hamano
2018-08-16 15:07                   ` [PATCH 2/2] submodule: munge paths to submodule git directories Junio C Hamano
2018-08-14 18:58         ` Jeff King
2018-08-28 21:35         ` Stefan Beller
2018-08-29  5:25           ` Jeff King
2018-08-29 18:10             ` Stefan Beller
2018-08-29 21:03               ` Jeff King [this message]
2018-08-29 21:10                 ` Stefan Beller
2018-08-29 21:18                   ` Jonathan Nieder
2018-08-29 21:27                     ` Stefan Beller
2018-08-29 21:30                   ` Jeff King
2018-08-29 21:09             ` Jonathan Nieder
2018-08-29 21:14               ` Stefan Beller
2018-08-29 21:25                 ` Brandon Williams
2018-08-29 21:32               ` Jeff King
2018-08-16  0:19     ` Aaron Schrab

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