Re: Not successful if statements returning error code

[Denis Osterland-Heim <denis.osterland@diehl.com>]

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.

Regards, Denis

>
> Cheers,
> Ahmad
>
>
> >
> > Regards, Denis
> >
> > >
> > > Cheers,
> > > Ahmad
> > >
> > > >
> > > > Thank you for your answer.
> > > >
> > > > Best regards,
> > > > Andrej
> > > >
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> > >
> >
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Nürnberg: HRB 32315

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