Re: [Babel] No output returned if just one command is failing

From: "Sébastien Vauban" <wxhgmqzgwmuf-geNee64TY+gS+FvcfC7Uqw@public.gmane.org>
To: emacs-orgmode-mXXj517/zsQ@public.gmane.org
Subject: Re: [Babel] No output returned if just one command is failing
Date: Thu, 02 Dec 2010 11:03:03 +0100	[thread overview]
Message-ID: <80lj488pbc.fsf@missioncriticalit.com> (raw)
In-Reply-To: 80sjyhjz0b.fsf@missioncriticalit.com

Hi Eric,

Sébastien Vauban wrote:
> "Eric Schulte" wrote:
>> I don't forsee adding partial results insertion both because
>>
>> - it would add a good deal of complexity to the code to insert results
>>   part-way through a run
>
> I can't comment on this, of course.
>
>> - the current behavior of only inserting results on a fully successful run
>>   is reasonable and is probably more obvious (at least to me) than
>>   inserting partial results
>
> Being fond of Babel, I'm using it always, everywhere. I prefer:
>
> 1. typing my shell commands in an Org buffer,
> 2. evaluate the block,
> 3. get the results automagically inserted in the buffer,
> 4. (eventually, version the whole file for later comparisons when updating
>    the code),
> 5. export the whole to HTML and/or PDF.
>
> The current behavior, even if totally respectable and defendable, inhibits
> such a way of working: if you write (or update) a shell code, and don't see
> (more or less) the same things as the ones you would see in a shell buffer,
> then you can't use such an Org buffer -- as long as one command fails.
>
> I don't especially want you to change your position, but I'm explaining the
> "negative" consequences for me.

BTW, what's the internal "definition" (in Org Babel) of "unsuccessful run" of
a (sh) command block?

Is it "return code != 0"?

If yes, such a sh block would never produce any results when the machine is
not a known name (as first command would "fail"):

#+begin_src sh :var machine :results output
ping $machine
rc=$?
if [ $rc == 0 ]; then
    echo "Machine pinged successfully with its name...";
else
    echo "Trying to ping machine by its IP...";
    ipmachine=$(grep whichever-list.txt | cut -f 2);
    ping $ipmachine
fi
#+end_src

(the above is just a simply sample of code which includes tests of rc)

Though, it does currently work with both known and unknown machines. So I'm
clearly missing something here.

Best regards,
  Seb

-- 
Sébastien Vauban

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