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From: "brian m. carlson" <sandals@crustytoothpaste.net>
To: Jeff King <peff@peff.net>
Cc: "Martin Ågren" <martin.agren@gmail.com>, git@vger.kernel.org
Subject: Re: [PATCH 1/3] setup: drop return value from `read_repository_format()`
Date: Thu, 20 Dec 2018 03:45:55 +0000	[thread overview]
Message-ID: <20181220034555.GC35965@genre.crustytoothpaste.net> (raw)
In-Reply-To: <20181220025211.GB24002@sigill.intra.peff.net>

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On Wed, Dec 19, 2018 at 09:52:12PM -0500, Jeff King wrote:
> On Thu, Dec 20, 2018 at 12:17:53AM +0000, brian m. carlson wrote:
> 
> > On Wed, Dec 19, 2018 at 10:27:35AM -0500, Jeff King wrote:
> > > I dunno. This is one of those dark corners of the code where we appear
> > > to do the wrong thing, but nobody seems to have noticed or cared much,
> > > and changing it runs the risk of breaking some obscure cases. I'm not
> > > sure if we should bite the bullet and try to address that, or just back
> > > away slowly and pretend we never looked at it. ;)
> > 
> > I will point out that with the SHA-256 work, reading the config file
> > becomes essential for SHA-256 repositories, because we need to know the
> > object format. Removing the config file leads to things blowing up in a
> > bad way (what specific bad way I don't remember).
> > 
> > That may influence the direction we want to take in this work, or not.
> 
> Wouldn't we just treat that the same way we do now? I.e., assume the
> default of sha1, just like we assume repositoryformatversion==0?

Yeah, we'll default to SHA-1, but the repository will be broken. HEAD
can't be read. Trying to run git status dies with "fatal: Unknown index
entry format". And so on. We've written data with 64-character object
IDs, which can't be read by Git in SHA-1 mode.

My point is essentially that in an SHA-256 repository, the config file
isn't optional anymore. We probably need to consider that and error out
in more situations (e.g. unreadable file or I/O error) instead of
silently falling back to the defaults, since failing loudly in a visible
way is better than having the user try to figure out why the index is
suddenly "corrupt".
-- 
brian m. carlson: Houston, Texas, US
OpenPGP: https://keybase.io/bk2204

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  reply	other threads:[~2018-12-20  3:46 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-18  7:25 [PATCH 0/3] setup: add `clear_repository_format()` Martin Ågren
2018-12-18  7:25 ` [PATCH 1/3] setup: drop return value from `read_repository_format()` Martin Ågren
2018-12-19 15:27   ` Jeff King
2018-12-19 21:42     ` Martin Ågren
2018-12-20  0:17     ` brian m. carlson
2018-12-20  2:52       ` Jeff King
2018-12-20  3:45         ` brian m. carlson [this message]
2018-12-20 14:53           ` Jeff King
2018-12-18  7:25 ` [PATCH 2/3] setup: do not use invalid `repository_format` Martin Ågren
2018-12-19  0:18   ` brian m. carlson
2018-12-19 21:43     ` Martin Ågren
2018-12-19 15:38   ` Jeff King
2018-12-19 21:46     ` Martin Ågren
2018-12-19 23:17       ` Jeff King
2018-12-20  0:21     ` brian m. carlson
2018-12-18  7:25 ` [PATCH 3/3] setup: add `clear_repository_format()` Martin Ågren
2018-12-19 15:48   ` Jeff King
2018-12-19 21:49     ` Martin Ågren
2019-01-14 18:34 ` [PATCH v2 0/3] " Martin Ågren
2019-01-14 18:34   ` [PATCH v2 1/3] setup: free old value before setting `work_tree` Martin Ågren
2019-01-14 18:34   ` [PATCH v2 2/3] setup: do not use invalid `repository_format` Martin Ågren
2019-01-15 19:31     ` Jeff King
2019-01-17  6:31       ` Martin Ågren
2019-01-22  7:07         ` Jeff King
2019-01-22 13:34           ` Martin Ågren
2019-01-22 21:45             ` [PATCH v3 0/2] setup: fix memory leaks with `struct repository_format` Martin Ågren
2019-01-22 21:45               ` [PATCH v3 1/2] setup: free old value before setting `work_tree` Martin Ågren
2019-01-22 21:45               ` [PATCH v3 2/2] setup: fix memory leaks with `struct repository_format` Martin Ågren
2019-01-23  5:57                 ` Jeff King
2019-01-24  0:14                   ` brian m. carlson
2019-01-25 19:25                     ` Martin Ågren
2019-01-25 19:24                   ` Martin Ågren
2019-01-25 19:51                     ` Jeff King
2019-02-25 19:21                       ` Martin Ågren
2019-02-26 17:46                         ` Jeff King
2019-02-28 20:36                           ` [PATCH v4 0/2] " Martin Ågren
2019-02-28 20:36                             ` [PATCH v4 1/2] setup: free old value before setting `work_tree` Martin Ågren
2019-02-28 20:36                             ` [PATCH v4 2/2] setup: fix memory leaks with `struct repository_format` Martin Ågren
2019-03-06  4:56                             ` [PATCH v4 0/2] " Jeff King
2019-01-14 18:34   ` [PATCH v2 3/3] setup: add `clear_repository_format()` Martin Ågren

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