Add SHA256 Support

Add SHA256 Support

[nick]

I am a satisfied user of Cgit, but I wish it supported SHA-256 repos.

Gitea will soon support SHA-256:

https://github.com/go-gitea/gitea/pull/23894

There is also at least one repository hosting platform which supports
SHA-256:

https://sha2git.com/

According to Git documentation, it should be safe to implement:

https://git-scm.com/docs/git-init#Documentation/git-init.txt---object-formatltformatgt

"Historically, we warned that SHA-256 repositories may later need
backward incompatible changes when we introduce such interoperability
features. Today, we only expect compatible changes. Furthermore, if such
changes prove to be necessary, it can be expected that SHA-256
repositories created with today’s Git will be usable by future
versions of Git without data loss."

Re: Add SHA256 Support

[Christian Hesse]

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"nick" <nick@nicholasjohnson.ch> on Tue, 2023/10/17 01:33:
> I am a satisfied user of Cgit, but I wish it supported SHA-256 repos.
> 
> Gitea will soon support SHA-256:
> 
> https://github.com/go-gitea/gitea/pull/23894
> 
> There is also at least one repository hosting platform which supports
> SHA-256:
> 
> https://sha2git.com/
> 
> According to Git documentation, it should be safe to implement:
> 
> https://git-scm.com/docs/git-init#Documentation/git-init.txt---object-formatltformatgt
> 
> "Historically, we warned that SHA-256 repositories may later need
> backward incompatible changes when we introduce such interoperability
> features. Today, we only expect compatible changes. Furthermore, if such
> changes prove to be necessary, it can be expected that SHA-256
> repositories created with today’s Git will be usable by future
> versions of Git without data loss."

This is a sha256 repository hosted by cgit:

https://git.zx2c4.com/sha256-oid-test/

Support was added around 2020/10/20.
-- 
main(a){char*c=/*    Schoene Gruesse                         */"B?IJj;MEH"
"CX:;",b;for(a/*    Best regards             my address:    */=0;b=c[a++];)
putchar(b-1/(/*    Chris            cc -ox -xc - && ./x    */b/42*2-3)*42);}

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