repositoryformatversion and extensions

From: Edward Thomson <ethomson@edwardthomson.com>
Date: Mar 11, 2024, 11:54 UTC
Message-ID: <CA+WKDT0fAASYE_ZhSxATv2NUnYceOP-_EF1kqKNFSOWU4QdPVQ@mail.gmail.com>

While looking at worktree configuration, I realized that the extensions.worktreeconfig configuration option was honored even when core.repositoryformatversion was unset, or explicitly set to 0.

Re-reading the docs for repository-version, it doesn't explicitly state that extensions _require_ repositoryformatversion >= 1, it instead states that:

> When reading the core.repositoryformatversion variable, a git
> implementation which supports version 1 MUST also read any configuration
> keys found in the extensions section of the configuration file.

Despite that, at least one extension (objectformat) does require core.repositoryformatversion >= 1. Though, do note that objectformat is not mentioned in the repository-version documentation.

What other extensions require repository format version >= 1? Is core.objectformat the outlier here?

Is there documentation on which extensions are supported at which repository format versions?

Are there other extensions that are not documented in repository-version?

Cheers- Ed