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From: Jeff King <peff@peff.net>
To: Dakota Hawkins <dakota@dakotahawkins.com>
Cc: Duy Nguyen <pclouds@gmail.com>,
	Junio C Hamano <gitster@pobox.com>, Git <git@vger.kernel.org>
Subject: Re: .gitattributes override behavior (possible bug, or documentation bug)
Date: Wed, 21 Mar 2018 03:50:41 -0400	[thread overview]
Message-ID: <20180321075041.GA24701@sigill.intra.peff.net> (raw)
In-Reply-To: <CAHnyXxTf16ukf8CFSfzjQjTEjf5yJXFqK5TnS9KiXZEeAD7dgg@mail.gmail.com>

On Wed, Mar 21, 2018 at 03:36:09AM -0400, Dakota Hawkins wrote:

> > I think that ignoring all of /ignore-most/ is much more efficient, since
> > we don't have to enumerate the paths inside it at all (which is why the
> > current behavior works as it does).
> 
> That's definitely true, but I wonder what the impact would be for most
> cases (even for most cases with large repos and larges sets of ignore
> files).

Probably not that much CPU, but it used to be quite annoying to fault in
the dcache for an infrequently used hierarchy. These days I generally
have an SSD and lots of memory for disk caching, so I don't know if it
would still be.

On systems where readdir/stat are slower than Linux it might be
noticeable for a big hierarchy.

> At any rate, would it at least be a good idea to make the "trailing
> slash halts recursion, won't consider nested .gitignore files"
> explicit in the `.gitignore` doc? Unless I'm missing it, I don't think
> that behavior is called out (or at least not called out concisely/in
> one place). It looks like this is all there is:

Yeah, it's definitely come up multiple times over the years. I don't
know what all is in gitignore(5), but if it's not mentioned it probably
should be.

>     "If the pattern ends with a slash, it is removed for the purpose
> of the following description, but it would only find a match with a
> directory. In other words, foo/ will match a directory foo and paths
> underneath it, but will not match a regular file or a symbolic link
> foo (this is consistent with the way how pathspec works in general in
> Git)."
> 
> Also, I'm not sure what the "following description" is in "it is
> removed for the purpose of the following description". Is that trying
> to imply "excluded from the rest of the doc"?

I think it means "for the rest of the description of how the patterns
work". I.e., "foo/" matches as "foo" when the rest of the matching rules
are applied. I agree it's a bit awkward. Patches welcome. :)

-Peff

  parent reply	other threads:[~2018-03-21  7:50 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-20  1:49 Dakota Hawkins
2018-03-20  2:34 ` Jeff King
2018-03-20  3:10   ` Dakota Hawkins
2018-03-20  3:17     ` Dakota Hawkins
2018-03-20  4:12       ` Jeff King
2018-03-20  4:04     ` Jeff King
2018-03-20  4:14       ` [PATCH] doc/gitattributes: mention non-recursive behavior Jeff King
2018-03-20  4:28         ` Dakota Hawkins
2018-03-20 16:41         ` Duy Nguyen
2018-03-21  6:50           ` Jeff King
2018-03-21 16:16             ` Duy Nguyen
2018-03-23  9:12               ` Jeff King
2018-03-20  4:25       ` .gitattributes override behavior (possible bug, or documentation bug) Dakota Hawkins
2018-03-20  4:40         ` Jeff King
2018-03-20  4:49           ` Dakota Hawkins
2018-03-20 16:28           ` Duy Nguyen
2018-03-21  3:22             ` Dakota Hawkins
2018-03-21  6:52               ` Jeff King
2018-03-21  7:36                 ` Dakota Hawkins
2018-03-21  7:44                   ` Dakota Hawkins
2018-03-21  7:50                   ` Jeff King [this message]
2018-03-21  8:35                     ` Dakota Hawkins
2018-03-21  8:36                       ` Jeff King
2018-03-21 16:18                   ` Junio C Hamano
2018-03-21 16:07               ` Duy Nguyen
2018-03-20  3:33   ` Junio C Hamano
2018-03-20  3:40     ` Dakota Hawkins
2018-03-20  3:45     ` Jeff King

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