Re: debconf, controlling terminal, and calling dialog "manually" from postinst
Matt Zimmerman <mdz@debian.org> schrieb:
> On Thu, Mar 11, 2004 at 05:09:32PM +0100, Frank K?ster wrote:
>
>> Is there any clear and definitive description of how debconf handles and
>> releases file descriptors and the controling terminal (besided the code
>> itself)? I found quite some remarks that debconf "can cause all sorts
>> of trouble" or the like. But I'd like to know exactly...
>>
>> The reason is #232725. We were calling a program in postinst - after
>> using debconf and without calling db_stop - that wanted to display its
>> error messages via dialog, but the dialog never was shown, so Ctrl-c was
>> the only way out. I've fixed it (in CVS) by simply not calling that
>> program, but I would like to understand.
>
> I would recommend against using such a program (unmodified) in a maintainer
> script. A tty may not even be available for running dialog, and interactive
> programs tend to misbehave in that situation.
Of course you're right (and we're going to fix it exactly this way). But
still I'd like to know what "all sorts of trouble" exactly is...
Regards, Frank
--
Frank Küster, Biozentrum der Univ. Basel
Abt. Biophysikalische Chemie
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