Re: [PATCH] diff-files: treat "i-t-a" files as "not-in-index"

[Srinidhi Kaushik <shrinidhi.kaushik@gmail.com>]

Hello,
Is there any update on this patch?
Please let me know if I missed anything.

Thanks!

On 06/12/2020 04:58, Srinidhi Kaushik wrote:
> Thanks for replying!
> 
> On Thu, Jun 11, 2020 at 01:27:22PM -0700, Junio C Hamano wrote:
> > Srinidhi Kaushik <shrinidhi.kaushik@gmail.com> writes:
> > 
> > > The `diff-files' command and related commands which call `cmd_diff_files()',
> > > consider the "intent-to-add" files as a part of the index when comparing the
> > > work-tree against it. This was previously addressed in [1] and [2] by turning
> > > the option `--ita-invisible-in-index' (introduced in [3]) on by default.
> > >
> > > For `diff-files' (and `add -p' as a consequence) to show the i-t-a files as
> > > as new, `ita_invisible_in_index' will be enabled by default here as well.
> > >
> > > [1] 0231ae71d3 (diff: turn --ita-invisible-in-index on by default, 2018-05-26)
> > > [2] 425a28e0a4 (diff-lib: allow ita entries treated as "not yet exist in
> > >                 index", 2016-10-24)
> > > [3] b42b451919 (diff: add --ita-[in]visible-in-index, 2016-10-24)
> > 
> > Is there any place where we still run the internal diff machinery to
> > compare the index and the working tree without setting the
> > ita_invisible_in_index bit on with this patch applied, and if so,
> > why?  Does the justification why that other place needs to leave
> > the bit off apply to this codepath as well?
> 
> Yes, I believe that there exist some use cases for `ita_invisible_in_index'
> to be unset. For instance, `index_differs_from' which is used in a quite a
> few places -- like "commit", "revert", and "rebase" -- which require a
> "no change" to be returned.
> 
> This commit: [1] addressed the issue where the cache-tree was producing
> the same tree as the current commit when it involved "intent-to-add"
> entries, instead of aborting.
> 
> [1] 018ec3c820 (commit: fix empty commit creation when there's no changes
>                 but ita entries, 2016-10-24) 
> 
> > What I am trying to get at is if this is helping only one usecase
> > for "diff-files" while breaking other usecases.
> 
> Currently, `run_add_p' (for "add"; which this patch addresses
> the fix), and `push_to_deploy' (in "receive-pack"; where this
> is the intended behavior), call "diff-files" as a subprocess,
> in which case the `ita_invisible_in_index' bit is explicitly
> set. For all other cases, calls are made directly
> to `run_diff_files' and will be unaffected by this change.
>  
> > On the other hand, if there is no longer anybody who wants
> > ita_invisible_in_index off, perhaps we can get rid of the bit and
> > lose many conditionals.