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Possible diff regression in v1.7.6-473-g27af01d

Subject: Possible diff regression in v1.7.6-473-g27af01d

## tl;dr

3 messages between Oct 24, 2011 and Oct 24, 2011.

replies: 2people: 3as markdown or json

Franz Schrober· Oct 24, 2011, 09:23 UTC · lore
Hi,
I am using git to manage some patches on top of the actual upstream files, but noticed that the result of git-format-patch changed between 4bfe7cb6668c43c1136304bbb17eea1b3ddf0237 and 27af01d552331eacf1ed2671b2b4b6ad4c268106
I've attached two input files (I tried to provide a minimal example... I am not sure if a smaller example is possible but at least both files are smaller than 10 lines) and the results with version 1.7.6.3 and and 1.7.7. The diffs were created using: git diff anonymized_orig anonymized_new
My .gitconfig file is empty.
Thanks
Thomas Rast· Oct 24, 2011, 09:38 UTC · re: Franz Schrober · lore

Re: Possible diff regression in v1.7.6-473-g27af01d

Franz Schrober wrote:
Show 7 quoted lines
> Hi,
> 
> I am using git to manage some patches on top of the actual upstream files, but noticed that the result of git-format-patch changed between 4bfe7cb6668c43c1136304bbb17eea1b3ddf0237 and 27af01d552331eacf1ed2671b2b4b6ad4c268106
> 
> I've attached two input files (I tried to provide a minimal example... I am not sure if a smaller example is possible but at least both files are smaller than 10 lines) and the results with version 1.7.6.3 and and 1.7.7. The diffs were created using: git diff anonymized_orig anonymized_new
> 
> My .gitconfig file is empty.

I'm not sure why you call this a regression. For the benefit of people who hate saving attachments, you used

  $ paste anonymized_orig anonymized_new  | xclip
  0       1
  0       2
  0       0
  0       3
          4
          5
          6
          7
the old diff was
  --- a/anonymized_orig
  +++ b/anonymized_new
  @@ -1,4 +1,8 @@
  -0
  -0
  -0
  -0
  +1
  +2
  +0
  +3
  +4
  +5
  +6
  +7
and the new diff is
  --- a/anonymized_orig
  +++ b/anonymized_new
  @@ -1,4 +1,8 @@
  +1
  +2
   0
  -0
  -0
  -0
  +3
  +4
  +5
  +6
  +7
 
So the new diff correctly represents the change, and on top of that is
shorter (by only one line, admittedly).  What makes it a regression?
-- 
Thomas Rast
trast@{inf,student}.ethz.ch
Tay Ray Chuan· Oct 24, 2011, 10:11 UTC · re: Thomas Rast · lore

Re: Possible diff regression in v1.7.6-473-g27af01d

On Mon, Oct 24, 2011 at 5:38 PM, Thomas Rast <trast@student.ethz.ch> wrote:
Show 51 quoted lines
>
> I'm not sure why you call this a regression.  For the benefit of
> people who hate saving attachments, you used
>
>  $ paste anonymized_orig anonymized_new  | xclip
>  0       1
>  0       2
>  0       0
>  0       3
>          4
>          5
>          6
>          7
>
> the old diff was
>
>  --- a/anonymized_orig
>  +++ b/anonymized_new
>  @@ -1,4 +1,8 @@
>  -0
>  -0
>  -0
>  -0
>  +1
>  +2
>  +0
>  +3
>  +4
>  +5
>  +6
>  +7
>
> and the new diff is
>
>  --- a/anonymized_orig
>  +++ b/anonymized_new
>  @@ -1,4 +1,8 @@
>  +1
>  +2
>   0
>  -0
>  -0
>  -0
>  +3
>  +4
>  +5
>  +6
>  +7
>
> So the new diff correctly represents the change, and on top of that is
> shorter (by only one line, admittedly).  What makes it a regression?
Thanks for inlining it, Thomas.
> Franz Schrober wrote:>> Hi,>>>> I am using git to manage some patches on top of the actual upstream files, but noticed that the result of git-format-patch changed between 4bfe7cb6668c43c1136304bbb17eea1b3ddf0237 and 27af01d552331eacf1ed2671b2b4b6ad4c268106>>>> I've attached two input files (I tried to provide a minimal example... I am not sure if a smaller example is possible but at least both files are smaller than 10 lines) and the results with version 1.7.6.3 and and 1.7.7. The diffs were created using: git diff anonymized_orig anonymized_new>>>> My .gitconfig file is empty.

This has been "fixed" in v1.7.7.1, with 713b85c (Merge branch 'rs/diff-cleanup-records-fix' into maint) - "fixed" in that it gives back the old behaviour, not that the diff produced is incorrect and needs fixing. (I'm running 1.7.7.1.599.g03eec, I get the same diff as diff.1.7.6.3)

-- 
Cheers,
Ray Chuan

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