Re: [PATCH v4 3/4] submodule: record superproject gitdir during absorbgitdirs

> On Mon, Oct 25, 2021 at 12:14:07PM -0400, Derrick Stolee wrote:
>> Since you're setting this config value inside the submodule's config,
>> what does it mean for a submodule to also be a worktree (and hence
>> require config.worktree)? What happens in this rough scenario?
>>
>>   1. git init sub
>>   2. git init super
>>   3. git -C sub worktree add super/sub
>>   4. git -C super submodule absorbgitdir sub
>>
>> I haven't actually tried running these things, but it seems unusual
>> and unexpected. This doesn't even account for cases where the repo
>> root and a worktree are both submodules within the superproject.
>>
>> If we already have protections preventing these worktrees as
>> submodules, then perhaps there is no need for work here. I'm not
>> familiar enough with the area to make a claim one way or another.
> 
> Yeah, I think there is actually a test case covering this in t7412:

> 147 test_expect_success 'absorbing fails for a submodule with multiple worktrees' '
> 148         test_must_fail git submodule absorbgitdirs sub3 2>error &&
> 149         test_i18ngrep "not supported" error
> 150 '
> 
> That is, I think because 'sub/' in your scenario above has multiple
> worktrees, the absorbgitdirs will fail. So I won't do additional work
> here. Thanks.