From: Junio C Hamano <gitster@pobox.com>
Date: Wed, 24 May 2023 10:25:42 GMT
Subject: Re: [PATCH 0/2] Fix behavior of worktree config in submodules
Message-ID: <xmqq4jo2gh5l.fsf@gitster.g>
In-Reply-To: <pull.1536.git.1684883872.gitgitgadget@gmail.com>

"Victoria Dye via GitGitGadget" <gitgitgadget@gmail.com> writes:

> About a year ago, discussion on the sparse index integration of 'git grep'
> surfaced larger incompatibilities between sparse-checkout and submodules
> [1]. This series fixes one of the underlying issues to that incompatibility,
> which is that the worktree config of the submodule (where
> 'core.sparseCheckout', 'core.sparseCheckoutCone', and 'index.sparse' are
> set) is not used when operating on the submodule from its super project
> (e.g., in a command with '--recurse-submodules').

OK.  So in short, worktreeConfig used to be a singleton, global for
the entire git process, but because "git grep" (and possibly others)
wants to operate across repository boundary when recursing into
submodules, the repository_format_worktree_config needs to be per
repository instance, not a global singleton.

Makes sense.