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Re: errexit inconsistent behaviour with pipelines


From: Chet Ramey
Subject: Re: errexit inconsistent behaviour with pipelines
Date: Mon, 06 Oct 2008 22:31:36 -0400
User-agent: Thunderbird 2.0.0.17 (Macintosh/20080914)

Chet Ramey wrote:

>> Will setting pipefail have any effect on this? If not, then is there a
>> way to make bash abort when one of the pipeline components fails,
>> without too much additional code?

Not easily.

>> On the other hand, to match the documentation, you would also have to
>> fix cases such as:
>>
>> set -e
>> true && false
>> echo done
>>
>> As they are not simple commands either, right? The manpage even
>> explicitly says that it "does not exit if the command that fails is
>> [...] part of a && or  ││ list".
> 
> That's true, except every other shell behaves this way.  It works for
> compatibility.  I'm going to have to audit this stuff, at the very
> least.

I should add that it's pretty much unanimous consensus among the `major'
shell implementers that this ambiguous language is a defect in the
standard, and the failure of the rightmost command in an AND or OR list
should cause the shell to exit.

I think the current behavior, once the pipeline stuff is fixed, is
pretty much correct.

Chet
-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer

Chet Ramey, ITS, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/




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