From: Jeff King <peff@peff.net>
To: git@vger.kernel.org
Subject: Re: [RFC] git checkout $tree -- $path always rewrites files
Date: Fri, 7 Nov 2014 03:38:05 -0500 [thread overview]
Message-ID: <20141107083805.GA26365@peff.net> (raw)
In-Reply-To: <20141107081324.GA19845@peff.net>
On Fri, Nov 07, 2014 at 03:13:24AM -0500, Jeff King wrote:
> I noticed that "git checkout $tree -- $path" will _always_ unlink and
> write a new copy of each matching path, even if they are up-to-date with
> the index and the content in $tree is the same.
By the way, one other thing I wondered while looking at this code: when
we checkout a working tree file, we unlink the old one and write the new
one in-place. Is there a particular reason we do this versus writing to
a temporary file and renaming it into place? That would give
simultaneous readers a more atomic view.
I suspect the answer is something like: you cannot always do a rename,
because you might have a typechange, directory becoming a file, or vice
versa; so anyone relying on an atomic view during a checkout operation
is already Doing It Wrong. Handling a content-change of an existing
path would complicate the code, so we do not bother.
But I would be curious to hear confirmation of that.
-Peff
next prev parent reply other threads:[~2014-11-07 8:38 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-07 8:13 [RFC] git checkout $tree -- $path always rewrites files Jeff King
2014-11-07 8:38 ` Jeff King [this message]
2014-11-07 10:13 ` Duy Nguyen
2014-11-07 16:51 ` Junio C Hamano
2014-11-07 19:15 ` Jeff King
2014-11-07 17:14 ` Junio C Hamano
2014-11-07 19:17 ` Jeff King
[not found] ` <CANiSa6hufp=80TaesNpo1CxCbwVq3LPXvYaUSbcmzPE5pj_GGw@mail.gmail.com>
2014-11-08 7:10 ` Martin von Zweigbergk
[not found] ` <CAPc5daWdzrHr8Rdksr3HycMRQu0=Ji7h=BPYjzZj7MH6Ko0VgQ@mail.gmail.com>
2014-11-08 8:03 ` Martin von Zweigbergk
2014-11-08 8:30 ` Jeff King
2014-11-08 8:45 ` Jeff King
2014-11-09 18:37 ` Junio C Hamano
2014-11-08 16:19 ` Martin von Zweigbergk
2014-11-09 9:42 ` Jeff King
2014-11-09 17:21 ` Junio C Hamano
2014-11-13 18:30 ` Jeff King
2014-11-13 19:15 ` Junio C Hamano
2014-11-13 19:26 ` Jeff King
2014-11-13 20:03 ` Jeff King
2014-11-13 21:18 ` Junio C Hamano
2014-11-13 21:37 ` Jeff King
2014-11-14 5:44 ` David Aguilar
2014-11-14 19:27 ` Junio C Hamano
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