From: Duy Nguyen <pclouds@gmail.com>
To: "brian m. carlson" <sandals@crustytoothpaste.net>,
"Derrick Stolee" <stolee@gmail.com>,
"Git Mailing List" <git@vger.kernel.org>,
"Jeff King" <peff@peff.net>,
"Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
Subject: Re: [PATCH v2 13/13] commit-graph: specify OID version for SHA-256
Date: Wed, 17 Oct 2018 16:31:19 +0200 [thread overview]
Message-ID: <CACsJy8C9nySzG0Uqs6_5V2rXHkAKr-ShXU7N9sPp4N5z=D0zQA@mail.gmail.com> (raw)
In-Reply-To: <20181016224404.GD432229@genre.crustytoothpaste.net>
On Wed, Oct 17, 2018 at 12:44 AM brian m. carlson
<sandals@crustytoothpaste.net> wrote:
> > > >> static uint8_t oid_version(void)
> > > >> {
> > > >> - return 1;
> > > >> + switch (hash_algo_by_ptr(the_hash_algo)) {
> > > >> + case GIT_HASH_SHA1:
> > > >> + return 1;
> > > >> + case GIT_HASH_SHA256:
> > > >> + return 2;
> > > > Should we just increase this field to uint32_t and store format_id
> > > > instead? That will keep oid version unique in all data formats.
> > > Both the commit-graph and multi-pack-index store a single byte for the
> > > hash version, so that ship has sailed (without incrementing the full
> > > file version number in each format).
> >
> > And it's probably premature to add the oid version field when multiple
> > hash support has not been fully realized. Now we have different ways
> > of storing hash id and need separate mappings.
>
> Honestly, anything in the .git directory that is not the v3 pack indexes
> or the loose object file should be in exactly one hash algorithm. We
> could simply just leave this value at 1 all the time and ignore the
> field, since we already know what algorithm it will use.
In this particular case, I agree, but not as a general principle. It's
nice to have independence for fsck-like tools. I don't know if we have
a tool that simply validates commit-graph file format (and not trying
to access any real object). But for such a tool, I guess we can just
pass the hash algorithm from command line. The user would have to
guess a bit.
--
Duy
next prev parent reply other threads:[~2018-10-17 14:31 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-15 2:18 [PATCH v2 00/13] Base SHA-256 implementation brian m. carlson
2018-10-15 2:18 ` [PATCH v2 01/13] sha1-file: rename algorithm to "sha1" brian m. carlson
2018-10-16 15:17 ` Duy Nguyen
2018-10-17 22:53 ` brian m. carlson
2018-10-15 2:18 ` [PATCH v2 02/13] sha1-file: provide functions to look up hash algorithms brian m. carlson
2018-10-17 13:32 ` SZEDER Gábor
2018-10-15 2:18 ` [PATCH v2 03/13] hex: introduce functions to print arbitrary hashes brian m. carlson
2018-10-16 1:54 ` Junio C Hamano
2018-10-17 23:49 ` brian m. carlson
2018-10-15 2:18 ` [PATCH v2 04/13] cache: make hashcmp and hasheq work with larger hashes brian m. carlson
2018-10-16 15:44 ` Duy Nguyen
2018-10-15 2:18 ` [PATCH v2 05/13] t: add basic tests for our SHA-1 implementation brian m. carlson
2018-10-15 2:18 ` [PATCH v2 06/13] t: make the sha1 test-tool helper generic brian m. carlson
2018-10-15 2:18 ` [PATCH v2 07/13] sha1-file: add a constant for hash block size brian m. carlson
2018-10-15 2:18 ` [PATCH v2 08/13] t/helper: add a test helper to compute hash speed brian m. carlson
2018-10-15 2:18 ` [PATCH v2 09/13] commit-graph: convert to using the_hash_algo brian m. carlson
2018-10-15 15:10 ` Derrick Stolee
2018-10-15 2:18 ` [PATCH v2 10/13] Add a base implementation of SHA-256 support brian m. carlson
2018-10-15 14:59 ` Duy Nguyen
2018-10-15 23:30 ` brian m. carlson
2018-10-16 14:59 ` Duy Nguyen
2018-10-17 16:12 ` SZEDER Gábor
2018-10-17 23:04 ` brian m. carlson
2018-10-15 2:18 ` [PATCH v2 11/13] sha256: add an SHA-256 implementation using libgcrypt brian m. carlson
2018-10-15 2:18 ` [PATCH v2 12/13] hash: add an SHA-256 implementation using OpenSSL brian m. carlson
2018-10-16 15:36 ` Duy Nguyen
2018-10-15 2:19 ` [PATCH v2 13/13] commit-graph: specify OID version for SHA-256 brian m. carlson
2018-10-15 15:11 ` Derrick Stolee
2018-10-16 2:00 ` Junio C Hamano
2018-10-16 22:39 ` brian m. carlson
2018-10-16 15:35 ` Duy Nguyen
2018-10-16 16:01 ` Derrick Stolee
2018-10-16 16:09 ` Duy Nguyen
2018-10-16 22:44 ` brian m. carlson
2018-10-17 14:31 ` Duy Nguyen [this message]
2018-10-18 0:06 ` brian m. carlson
2018-10-18 13:03 ` Derrick Stolee
2018-10-19 22:21 ` brian m. carlson
2018-10-17 12:21 ` Derrick Stolee
2018-10-17 22:38 ` brian m. carlson
2018-10-16 2:00 ` [PATCH v2 00/13] Base SHA-256 implementation Junio C Hamano
2018-10-16 4:01 ` Junio C Hamano
2018-10-16 22:45 ` brian m. carlson
2018-10-16 15:39 ` Duy Nguyen
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