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From: Junio C Hamano <gitster@pobox.com>
To: Casey Meijer <cmeijer@strongestfamilies.com>
Cc: "brian m. carlson" <sandals@crustytoothpaste.net>,
	"git\@vger.kernel.org" <git@vger.kernel.org>
Subject: Re: BUG FOLLOWUP: Case insensitivity in worktrees
Date: Fri, 24 Jul 2020 12:36:01 -0700	[thread overview]
Message-ID: <xmqq7dusn1su.fsf@gitster.c.googlers.com> (raw)
In-Reply-To: <02819EF1-CCA7-4A0F-9497-F6A52E6CBF30@strongestfamilies.com> (Casey Meijer's message of "Fri, 24 Jul 2020 18:17:12 +0000")

Casey Meijer <cmeijer@strongestfamilies.com> writes:

> Sorry I got mixed up,, that last message should have been
> addressed to Junio.
>
> My apologies. 
>
> To put it very simply, I'm asking that git respect the separation
> of concerns between itself and its storage engine (regardless of
> whether that's pluggable, or just the current filesystem, which I
> guess is technically pluggable, lol).

If "git" is told to store ref 'foo' pointing at object X and then
ref 'Foo' pointing at object Y by the end user, after claiming to
have done these two operations, if it is then asked about the value
of 'foo', it must say that 'foo' points at object X and not Y.  If a
ref backend is based on case insensitive filesystem, there are only
two options available.  (1) ignore case and violate the expectation
of end user. (2) come up with a way to "defeat" the limitation of
case insensitivity imposed by the filesystem (e.g. your ref backend
implementation _could_ URLencode/decode the ref before using it as a
filename on such a filesystem).  

Doing (2) would be transparent to the rest of Git (i.e. the rest of
Git does not have to care that each ref is stored in a file, whose
filename is encoded version of the refname) and gives us a good
separation of concerns between it and the storage backend.  Those
who ported Git to case insensitive filesystems didn't and chose (1).

As (1) violates end-user expectation, I would think it is fair to
declare it a bug.

  reply	other threads:[~2020-07-24 19:36 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <EEA65ED1-2BE0-41AD-84CC-780A9F4D9215@strongestfamilies.com>
2020-07-23 15:20 ` Casey Meijer
2020-07-24  1:19   ` brian m. carlson
2020-07-24  1:25     ` Junio C Hamano
2020-07-24 18:07       ` Casey Meijer
2020-07-24 18:17       ` Casey Meijer
2020-07-24 19:36         ` Junio C Hamano [this message]
2020-07-24 18:14     ` Casey Meijer
2020-07-24 21:09       ` brian m. carlson

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