Re: [PATCH v2 13/13] commit-graph: specify OID version for SHA-256

[Derrick Stolee <stolee@gmail.com>]

On 10/17/2018 8:06 PM, brian m. carlson wrote:
> On Wed, Oct 17, 2018 at 04:31:19PM +0200, Duy Nguyen wrote:
>> On Wed, Oct 17, 2018 at 12:44 AM brian m. carlson
>> <sandals@crustytoothpaste.net> wrote:
>>> 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.
> I'm going to drop this patch for now.  I'll send a follow-up series
> later which bumps the format version for this and the multi-pack index
> and serializes them with the four-byte value.  I probably should have
> caught this earlier, but unfortunately I don't always have the time to
> look at every series that hits the list.
We should coordinate before incrementing the version number. I was 
working on making the file formats incremental (think split-index) but 
couldn't come up with a way to do it without incrementing the file 
format. It would be best to combine these features into v2 of each format.

Thanks,
-Stolee