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Date: Tue, 05 Feb 2013 13:55:20 -0500
From: Lathan Bidwell <lathan@andrews.edu>
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Subject: Re: FreeBSD project and subversion.
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On 02/05/2013 01:14 PM, Stefan Sperling wrote:
> On Tue, Feb 05, 2013 at 09:19:19AM -0800, Alexey Neyman wrote:
>> There is one more weird issue with svn diff, see the script below. The issue
>> is that "--old=A --new=B" is not opposite of "--old=B --new=A". I don't know
>> if it is a bug or another ambuguity I am not aware of :)
>>
>> Here is the script:
>> [[[
>> #!/bin/bash
>>
>> REPO=/tmp/foo
>> WC=/tmp/foo.wc
>>
>> rm -rf $REPO $WC
>> svnadmin create $REPO
>> svn co -q file://$REPO $WC
>> cd $WC
>>
>> echo r1 > a
>> svn add -q a
>> svn ci -q -m R1
>> echo r2 > a
>> svn ci -q -m R2
>> svn up -q -r 1
>> echo new > a
>> echo "Issue: --old=A --new=B is not opposite of --old=B --new=A"
>> echo "  Running: svn di --old=^/ --new=."
>> svn di --old=^/ --new=.
>> echo "  Running: svn di --old=. --new=^/"
>> svn di --old=. --new=^/
>> ]]]
>>
>> And here is the output (svn 1.7.6):
>> [[[
>> Issue: --old=A --new=B is not opposite of --old=B --new=A
>>    Running: svn di --old=^/ --new=.
>> Index: a
>> ===================================================================
>> --- a   (.../file:///tmp/foo)   (revision 2)
>> +++ a   (working copy)
>> @@ -1 +1 @@
>> -r2
>> +new
>>    Running: svn di --old=. --new=^/
>> Index: a
>> ===================================================================
>> --- a   (working copy)
>> +++ a   (.../file:///tmp/foo)   (revision 2)
>> @@ -1 +1 @@
>> -r1
>> +r2
>> ]]]
>>
>> Regards,
>> Alexey.
> I can reproduce this with a trunk build. Can you please file an issue
> for this? I'm not going to get to this right away. Thanks!
>
>
Here is the issue that I see:

The --old=. get's the workspace version of ., but --new get's the 
non-changed version of /.

So, I believe it is comparing "r1" with the r2 contents of "r2" and not 
comparing both workspace versions.

Rev    Contents
1        r1
2        r2
2*      new

2* only get's referenced when it is in the --old position,
2 get's used when its in the --new position.


Please correct me if I'm wrong about this, but that is what seems to be 
a logical reasoning behind that behavior.

Lathan