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cmake: warn for not using sha1dc

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git's hash algorithm is sha1dc, it is not sha1. Per Linus:

> Honestly, git has effectively already moved from SHA1 to SHA1DC.
>
> So the actual known attack and weakness of SHA1 should simply not be
> part of the discussion for the next hash. You can basically say "we're
> _already_ on the second hash, we just picked one that was so
> compatible with SHA1 that nobody even really noticed.

Warn users who try to compile with SHA1 instead of SHA1DC.
This commit is contained in:
Edward Thomson
2024-12-28 09:49:28 +00:00
parent dc816591d5
commit 550cf62021
3 changed files with 15 additions and 0 deletions
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docs/changelog.md
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@@ -253,6 +253,8 @@ will introduce a number of breaking changes in v2.0:
https://github.com/libgit2/libgit2/pull/6924
* ci: port latest fixes to nightlies by @ethomson in
https://github.com/libgit2/libgit2/pull/6926
* cmake: warn for not using sha1dc by @ethomson in
https://github.com/libgit2/libgit2/pull/6986
### Documentation improvements