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From: Denys Vlasenko <vda.linux@googlemail.com>
To: Harald van Dijk <harald@gigawatt.nl>
Cc: "Roberto A. Foglietta" <roberto.foglietta@gmail.com>,
	DASH shell mailing list <dash@vger.kernel.org>
Subject: Re: shell script error management in busybox ash
Date: Wed, 15 Sep 2021 22:22:41 +0200	[thread overview]
Message-ID: <CAK1hOcPMDnxZZ=cpSR-sVnfA8Cdno_QFO=OT6QXRjOKOOEPSQA@mail.gmail.com> (raw)
In-Reply-To: <6f4b5c87-a7ef-a80b-2230-de4c7d540318@gigawatt.nl>

On Wed, Sep 15, 2021 at 10:16 PM Harald van Dijk <harald@gigawatt.nl> wrote:
> >>> Yes, _this_ is the problem we are having.
> >>>
> >>> E.g. $FUNCNAME in EXIT trap needs to be current function's name.
> >>
> >> Important to also mention that although FUNCNAME is not part of POSIX,
> >> and there is no spec to compare to, in bash and ksh it does not behave
> >> that way
> >
> > In my testing, it does.
> >
> >> so you're talking about implementing FUNCNAME in a way that is
> >> incompatible with existing shells.
> >
> > Try this in bash:
> >
> >    trap 'echo trap:$FUNCNAME' EXIT
> >    f() { exit; }
> >    f
> >
> > I'm getting:
> >    trap:f
>
> For bash, it depends on how the shell is invoked. When bash reads
> commands from stdin, it prints trap:f. When bash is called with that
> exact same script passed as -c, it prints trap:. There may be a more
> specific option that can control this.

Indeed. In -c, it prints "trap:"

In a script, it prints "trap:f"

Looks quite inconsistent.

Well, in this case I'd fall back to "what would be the most _useful_
behavior". Losing information in which function "exit" was is less useful.
I prefer passing it to EXIT trap.

      reply	other threads:[~2021-09-15 20:22 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-15 17:47 shell script error management in busybox ash Roberto A. Foglietta
2021-09-15 19:47 ` Denys Vlasenko
2021-09-15 19:59   ` Harald van Dijk
2021-09-15 20:07     ` Denys Vlasenko
2021-09-15 20:16       ` Harald van Dijk
2021-09-15 20:22         ` Denys Vlasenko [this message]

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