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From: Derrick Stolee <stolee@gmail.com>
To: "brian m. carlson" <sandals@crustytoothpaste.net>, git@vger.kernel.org
Cc: "Martin Ågren" <martin.agren@gmail.com>
Subject: Re: [PATCH 0/2] Documentation updates for SHA-256
Date: Thu, 13 Aug 2020 22:33:20 -0400	[thread overview]
Message-ID: <da077fb0-14bb-b84f-c526-d759ebc9f5eb@gmail.com> (raw)
In-Reply-To: <20200813224901.2652387-1-sandals@crustytoothpaste.net>

On 8/13/2020 6:48 PM, brian m. carlson wrote:
> As was pointed out recently, some of our documentation doesn't properly
> reflect the new support for SHA-256.

Just to bring up some subtlety in Martin's message [1], there is some
valid concern that the existing file formats are not correctly versioned
"in a vacuum." When they are in a repository that has SHA-256 set as its
hash algorithm, Git interprets these file formats correctly, but if a
*.pack file (and its *.idx) happened to be copied into the pack directory
of a Git repository still in SHA-1 mode, then Git would get confused and
probably fail miserably.

Is that really a concern? Maybe, but also Git will never move data like
that. The main thing is to focus on compatibility of the .git directory
as a whole (and the protocol, as we move into inter-operability mode).

[1] https://lore.kernel.org/git/CAN0heSptiJL9d86ZeNPMUaZeTA68juwTyf3K-uWR=K-vt=1Hrg@mail.gmail.com/

>  This series updates the pack and
> index documentation to reflect that these formats can handle SHA-256,
> and updates the transition plan to reflect what we've implemented and
> what the next steps are.

These patches are good to help clarify these formats in the new world.

Thanks,
-Stolee

  parent reply	other threads:[~2020-08-14  2:33 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-13 22:48 brian m. carlson
2020-08-13 22:49 ` [PATCH 1/2] docs: document SHA-256 pack and indices brian m. carlson
2020-08-14  2:26   ` Derrick Stolee
2020-08-13 22:49 ` [PATCH 2/2] docs: fix step in transition plan brian m. carlson
2020-08-14 12:21   ` Martin Ågren
2020-08-14  2:33 ` Derrick Stolee [this message]
2020-08-14  4:47   ` [PATCH 0/2] Documentation updates for SHA-256 Junio C Hamano
2020-08-14 20:20     ` brian m. carlson
2020-08-14 20:25       ` Junio C Hamano
2020-08-14 12:21 ` [PATCH 0/5] more SHA-256 documentation Martin Ågren
2020-08-14 12:21   ` [PATCH 1/5] http-protocol.txt: document SHA-256 "want"/"have" format Martin Ågren
2020-08-14 17:28     ` Junio C Hamano
2020-08-14 20:23       ` brian m. carlson
2020-08-14 20:32         ` Martin Ågren
2020-08-14 20:39         ` Junio C Hamano
2020-08-14 20:47           ` Junio C Hamano
2020-08-14 12:21   ` [PATCH 2/5] index-format.txt: document SHA-256 index format Martin Ågren
2020-08-14 12:28     ` Derrick Stolee
2020-08-14 14:05       ` Martin Ågren
2020-08-14 12:21   ` [PATCH 3/5] protocol-capabilities.txt: clarify "allow-x-sha1-in-want" re SHA-256 Martin Ågren
2020-08-14 12:31     ` Derrick Stolee
2020-08-14 14:05       ` Martin Ågren
2020-08-14 17:33     ` Junio C Hamano
2020-08-14 20:35       ` Martin Ågren
2020-08-14 20:43         ` Junio C Hamano
2020-08-14 12:21   ` [PATCH 4/5] shallow.txt: document SHA-256 shallow format Martin Ågren
2020-08-14 12:21   ` [PATCH 5/5] commit-graph-format.txt: fix "Hash Version" description Martin Ågren
2020-08-14 12:37     ` Derrick Stolee
2020-08-14 14:10       ` Martin Ågren
2020-08-14 20:28   ` [PATCH 0/5] more SHA-256 documentation brian m. carlson
2020-08-15 16:05   ` [PATCH v2 0/4] " Martin Ågren
2020-08-15 16:05     ` [PATCH v2 1/4] http-protocol.txt: document SHA-256 "want"/"have" format Martin Ågren
2020-08-15 16:06     ` [PATCH v2 2/4] index-format.txt: document SHA-256 index format Martin Ågren
2020-08-15 16:06     ` [PATCH v2 3/4] protocol-capabilities.txt: clarify "allow-x-sha1-in-want" re SHA-256 Martin Ågren
2020-08-15 16:06     ` [PATCH v2 4/4] shallow.txt: document SHA-256 shallow format Martin Ågren

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