Re: Adding nested repository with slash adds files instead of gitlink

[Junio C Hamano <gitster@pobox.com>]

Duy Nguyen <pclouds@gmail.com> writes:

> On Tue, Jun 19, 2018 at 12:36 PM Heiko Voigt <hvoigt@hvoigt.net> wrote:
>>
>> On Mon, Jun 18, 2018 at 11:12:15AM -0700, Brandon Williams wrote:
>> > On 06/18, Duy Nguyen wrote:
>> > > This sounds like the submodule specific code in pathspec.c, which has
>> > > been replaced with something else in bw/pathspec-sans-the-index. If
>> > > you have time, try a version without those changes (e.g. v2.13 or
>> > > before) to see if it's a possible culprit.
>> >
>> > I just tested this with v2.13 and saw the same issue.  I don't actually
>> > think this ever worked in the way you want it to Heiko.  Maybe git add
>> > needs to be taught to be more intelligent when trying to add a submodule
>> > which doesn't exist in the index.
>>
>> That was also my guess, since my feeling is that this is a quite rare
>> use case. Adding submodules alone is not a daily thing, let alone
>> selecting different changes after 'git submodule add'.
>>
>> I also think git could be more intelligent here.
>
> Ah.. the "submodule not registered in index" case. I think I remember
> this (because I remember complaining about it once or two times).
> Definitely agreed that git-add should do the right thing here.

I am not sure if this even needs to be implemented as "look for the
submodule in the index".  Even before submodule was added, we knew
that "git add foo/bar" should reject the request if we find foo is a
symbolic link, and we should do the same when foo/ is a directory
that is the top of a working tree under control of another
repository, no?

Hmm, what happens when we do this?

	git init
	ln -s /tmp foo
	>foo/bar
	git add foo/

I think we should say either "let's add foo symlink" or
"foo/. (directory) is beyond symlink" (the latter is preferrable,
but the former is acceptable as long as foo is pointing at a
directory; but foo could be a dangling symlink whose pointee's type
may not be discernable by "git add").

Shouldn't we be reacting pretty much the same when we see this?

	git init
	git init foo
	>foo/bar
	git add foo/

That is, either drop '/' and add 'foo' as a submodule, or say
"foo/. (directory) belongs to another repository, cannot add here"
(again, the latter is preferrable for consistency with the symlink
behaviour above).