Re: Not successful if statements returning error code

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

Hi,

On 29.07.21 11:48, Denis Osterland-Heim wrote:
> Hi,
> 
> Am Donnerstag, den 29.07.2021, 11:22 +0200 schrieb Ahmad Fatoum:
>> On 28.07.21 11:38, Denis Osterland-Heim wrote:
>>> Hi,
>>>
>>> Am Mittwoch, den 28.07.2021, 10:56 +0200 schrieb Ahmad Fatoum:
>>>
>>>> I talked with Sascha once before (off-list) about a similar issue. Missing error handling
>>>> results in
>>>>
>>>>   [ x1 -eq x2 ] && echo yes || echo no
>>>>
>>>> printing yes.
>>>>
>>>> We agreed that it's ok to break scripts relying on clear hush bugs like this.
>>>>
>>>> I'd thus recommend you to send a patch to fix hush instead of working around it.
>>>
>>> shellcheck says:
>>>
>>> SC2015: Note that A && B || C is not if-then-else. C may run when A is true.
>>>
>>> So I would think that B is maybe allowed to run before A, too.
>>> But, I do not know if Hush specifies execution order here.
>>
>> An option-less barebox echo can't fail, so it should never
>> print both yes and no, but thanks for the reference. I'll keep
>> an eye on it in future shell code.
>>
>> This wasn't what I meant to show though, I meant that x1 and x2
>> are both non-integers and -eq which compares integers returns
>> true when comparing them unlike what a POSIX shell does.
> Oh. Now I got your point ;-)
> 
> https://git.pengutronix.de/cgit/barebox/tree/commands/test.c#n182
> error handling is missing here.
> It is very likely that simple_strtol() returns the same value in case of error,
> which results in a successfully compare.

Yes. I noted this because of the similarity to Andrej's problem:
A bug leads to clearly bogus shell behavior. It can be ok to fix such bugs
despite them not being 100% backwards compatible.

> 
> Regards, Denis
> 
>>
>> Cheers,
>> Ahmad
>>
>>
>>>
>>> Regards, Denis
>>>
>>>>
>>>> Cheers,
>>>> Ahmad
>>>>
>>>>>
>>>>> Thank you for your answer.
>>>>>
>>>>> Best regards,
>>>>> Andrej
>>>>>
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>>
>>
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