Subject: Re: [PATCH 0/2] Reinstate the helpful message when `git pull --rebase` fails

From: Torsten Bögershausen <[email-masked]>
Date: Sat, 10 Oct 2015 18:05:52 +0200

On 09.10.15 12:11, Johannes Schindelin wrote:
> Me again,
> 
> On 2015-10-09 11:50, Johannes Schindelin wrote:
>>
>> On 2015-10-09 03:40, Paul Tan wrote:
>>> On Fri, Oct 9, 2015 at 8:52 AM, Junio C Hamano <[email-masked]> wrote:
>>>> Johannes Schindelin <[email-masked]> writes:
>>>>
>>>>> Brendan Forster noticed that we no longer see the helpful message after
>>>>> a failed `git pull --rebase`. It turns out that the builtin `am` calls
>>>>> the recursive merge function directly, not via a separate process.
>>>>>
>>>>> But that function was not really safe to be called that way, as it
>>>>> die()s pretty liberally.
>>>
>>> I'm not too familiar with the merge-recursive.c code, but I was under
>>> the impression that it only called die() under fatal conditions. In
>>> common use cases, such as merge conflicts, it just errors out and the
>>> helpful error message does get printed. Is there a reproduction recipe
>>> for this?
>>
>> Yes. Sorry, I should have added that as part of the patch series.
>> Actually, I should have written it *before* making those patches.
>> Because it revealed that the underlying problem is completely
>> different: *Normally* you are correct, if `pull --rebase` fails with a
>> merge conflict, the advice is shown.
>>
>> The problem occurs with CR/LF.
> 
> I finally have that test case working, took way longer than I wanted to:
> 
> -- snip --
> Subject: [PATCH 3/2] Verify that `git pull --rebase` shows the helpful advice when failing
> Author: Johannes Schindelin <[email-masked]>
> Date:   Fri Oct 9 11:15:30 2015 +0200
>     
> Signed-off-by: Johannes Schindelin <[email-masked]>
> 
> diff --git a/t/t5520-pull.sh b/t/t5520-pull.sh
> index a0013ee..bce332f 100755
> --- a/t/t5520-pull.sh
> +++ b/t/t5520-pull.sh
> @@ -237,6 +237,18 @@ test_expect_success '--rebase' '
>  	test new = "$(git show HEAD:file2)"
>  '
>  
> +test_expect_success 'failed --rebase shows advice' '
> +	git checkout -b diverging &&
> +	test_commit attributes .gitattributes "* text=auto" attrs &&
> +	sha1="$(printf "1\\r\\n" | git hash-object -w --stdin)" &&
> +	git update-index --cacheinfo 0644 $sha1 file &&
> +	git commit -m v1-with-cr &&
> +	git checkout -f -b fails-to-rebase HEAD^ &&
> +	test_commit v2-without-cr file "2" file2-lf &&
> +	test_must_fail git pull --rebase . diverging 2>err >out &&
> +	grep "When you have resolved this problem" out
> +'
> +

One other question:
Is it good to mix 2 different things in one test case ?
"shows the helpful advice when failing" is one thing,
and the problematic CRLF handling another.

Does it make sense to simply create "really-modified" file to test the helpful advice ?

And may be another one witch test the CRLF handling, (may be)