I've sent out version [PATCH v4] with most of the things addressed.
That one hasn't been reviewed by anyone yet

On Tue, May 27, 2014 at 11:04 AM, Junio C Hamano <gits...@pobox.com> wrote:
> Duy Nguyen <pclo...@gmail.com> writes:
>> On Sat, May 24, 2014 at 12:33 AM, Pasha Bolokhov
>> <pasha.bolok...@gmail.com> wrote:
>>> When an explicit '--git-dir' option points to a directory inside
>>> the work tree, git treats it as if it were any other directory.
>>> In particular, 'git status' lists it as untracked, while 'git add -A'
>>> stages the metadata directory entirely
>>> Add GIT_DIR to the list of excludes in setup_standard_excludes(),
>>> while checking that GIT_DIR is not just '.git', in which case it
>>> would be ignored by default, and that GIT_DIR is inside GIT_WORK_TREE
>>> Although an analogous comparison of any given path against '.git'
>>> is done in treat_path(), this does not seem to be the right place
>>> to compare against GIT_DIR. Instead, the excludes provide an
>>> effective mechanism of ignoring a file/directory, and adding GIT_DIR
>>> as an exclude is equivalent of putting it into '.gitignore'. Function
>>> setup_standard_excludes() was chosen because that is the place where
>>> the excludes are initialized by the commands that are concerned about
>>> excludes
>> I like this approach. A search of "exclude-standard" in Documentation/
>> gives git-grep.txt and git-ls-files.txt. I don't know if we need to
>> add something about this extra exclude rule to those .txt. If it's so
>> obvious that this should be the expected behavior, then probably not.
> OK, so is that an Acked/Reviewed-by?
>> The case of "git grep --exclude-standard" is interesting because it's
>> intended to work without a repository. First reaction was would
>> get_git_dir() return NULL in that case. But it should return ".git" so
>> we're good.
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