Possible diff regression in v1.7.6-473-g27af01d

3 messages, 3 authors, 2016-06-15 · open the first message on its own page

Possible diff regression in v1.7.6-473-g27af01d

From: Franz Schrober <hidden>
Date: 2016-06-15 22:52:19

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

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

From: Thomas Rast <hidden>
Date: 2016-06-15 22:52:19

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.
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

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

From: Tay Ray Chuan <hidden>
Date: 2016-06-15 22:52:19

On Mon, Oct 24, 2011 at 5:38 PM, Thomas Rast [off-list ref] wrote:
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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