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From: Jeff King <peff@peff.net>
To: Joey Hess <id@joeyh.name>
Cc: git@vger.kernel.org
Subject: Re: git cat-file --batch surprising carriage return behavior
Date: Fri, 11 Oct 2019 02:21:37 -0400
Message-ID: <20191011062136.GA25741@sigill.intra.peff.net> (raw)
In-Reply-To: <20191009152851.GC19679@kitenet.net>

On Wed, Oct 09, 2019 at 11:28:51AM -0400, Joey Hess wrote:

> > I suspect it's not entirely sufficient for clean input, though. You're
> > not feeding filenames but rather full "object names". I wouldn't be
> > surprised if we mis-parse "$rev:$path" when $path has "@{}" or similar
> > in it.
> 
> Nothing I've tried along the lines of "HEAD:{yesterday}" has misparsed
> the part after the colon as anything but a filename.

It's possible we've fixed them all. We definitely don't parse strictly
left-to-right. The first thing we try to do is strip bits like ^{commit}
off the end, before we even find the colon. But after doing so, we
should generally be left with a resolvable name, and I think that uses
the "basic" parser which will not allow colons. I.e., this:

  mkdir subdir
  echo whatever >subdir/file
  git add subdir
  git commit -m 'add directory'
  git show HEAD:subdir^{tree}

really does look for the file "subdir^{tree}" in HEAD, and not
"HEAD:subdir" as a tree.

We have had bugs in the past; I'm thinking specifically of 8cd4249c4c
(interpret_branch_name: always respect "namelen" parameter, 2014-01-15).
But I couldn't find any problematic inputs after poking around for a few
minutes.

> The one I can think of where there's a parse ambiguity is that while
> :foo gets file foo, :1:foo does not get file "1:foo". Instead it's
> treated as a stage number. Using either HEAD:1:foo or :./1:foo
> will avoid that ambiguity.

Yeah, that makes sense.

-Peff

      reply	other threads:[~2019-10-11  6:21 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-08 19:22 Joey Hess
2019-10-08 20:00 ` Jeff King
2019-10-09 15:28   ` Joey Hess
2019-10-11  6:21     ` Jeff King [this message]

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