Re: [PATCH] connect: also update offset for features without values

[Andrzej Hunt <andrzej@ahunt.org>]

On 24/09/2021 00:02, Jeff King wrote:
> On Thu, Sep 23, 2021 at 02:52:53PM -0700, Junio C Hamano wrote:
> 
>> Jeff King <peff@peff.net> writes:
>>
>>> I think the problem is that our fake upload-pack exits immediately, so
>>> ls-remote gets SIGPIPE. In a v0 conversation, ls-remote expects to say
>>> "0000" to indicate that it's not interested in fetching anything (in v2,
>>> it doesn't bother, since fetching would be a separate request that it
>>> just declines to make).
>>
>> Ah, Makes sense---the usual SIGPIPE problem ;-)
> 
> Yes, though it definitely took some head-scratching for me to see where
> it was. ;)
> 
> Doing: "./t5704-* --stress" made it pretty clear. It fails almost
> immediately, and mentions SIGPIPE (well, exit code 141, but by now I
> have that one memorized).
> 
>>> This seems to fix it:
>>>
>>> diff --git a/t/t5704-protocol-violations.sh b/t/t5704-protocol-violations.sh
>>> index 34538cebf0..0983c2b507 100755
>>> --- a/t/t5704-protocol-violations.sh
>>> +++ b/t/t5704-protocol-violations.sh
>>> @@ -40,7 +40,7 @@ test_expect_success 'bogus symref in v0 capabilities' '
>>>   			test-tool pkt-line pack-raw-stdin &&
>>>   		printf "0000"
>>>   	} >input &&
>>> -	git ls-remote --upload-pack="cat input ;:" . >actual &&
>>> +	git ls-remote --upload-pack="cat input; read junk;:" . >actual &&
>>>   	printf "%s\tHEAD\n" "$oid" >expect &&
>>>   	test_cmp expect actual
>>>   '
>>
>> Yup.  In the original thread there was some further back-and-forth
>> about further improving the test, if I recall correctly; has the
>> issue been settled there, or is everybody happy with the above
>> version?
> 
> I think the change I showed earlier (to use ls-remote --symref) is worth
> doing. There was lots of discussion about how to format a tab, but in
> the end I don't think it really matters.
> 
> So here's that patch again, with this race fix on top, which could be
> squashed in, and then I hope we can call it good.

Thanks again for doing the actual work - I'll send out a V2 with your 
changes squashed in, along with an attempt at improving the commit 
message (as discussed in reply to Taylor's comments).

> 
> diff --git a/t/t5704-protocol-violations.sh b/t/t5704-protocol-violations.sh
> index 34538cebf0..bc393d7c31 100755
> --- a/t/t5704-protocol-violations.sh
> +++ b/t/t5704-protocol-violations.sh
> @@ -35,13 +35,15 @@ test_expect_success 'extra delim packet in v2 fetch args' '
>   test_expect_success 'bogus symref in v0 capabilities' '
>   	test_commit foo &&
>   	oid=$(git rev-parse HEAD) &&
> +	dst=refs/heads/foo &&
>   	{
> -		printf "%s HEAD\0symref object-format=%s\n" "$oid" "$GIT_DEFAULT_HASH" |
> +		printf "%s HEAD\0symref object-format=%s symref=HEAD:%s\n" \
> +			"$oid" "$GIT_DEFAULT_HASH" "$dst" |
>   			test-tool pkt-line pack-raw-stdin &&
>   		printf "0000"
>   	} >input &&
> -	git ls-remote --upload-pack="cat input ;:" . >actual &&
> -	printf "%s\tHEAD\n" "$oid" >expect &&
> +	git ls-remote --symref --upload-pack="cat input; read junk;:" . >actual &&
> +	printf "ref: %s\tHEAD\n%s\tHEAD\n" "$dst" "$oid" >expect &&
>   	test_cmp expect actual
>   '
>   
>