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Re: [RFC] Logically composable variant of errexit


From: Chet Ramey
Subject: Re: [RFC] Logically composable variant of errexit
Date: Thu, 09 Oct 2014 21:29:57 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:24.0) Gecko/20100101 Thunderbird/24.6.0

On 10/9/14, 8:20 AM, Andreas Grünbacher wrote:
> Hi all,
> 
> the errexit option can be very useful in simple scripts. This option
> is being ignored in many contexts like lists and conditionals though.
> I understand that this is "by design" and that errexit cannot be
> "fixed" to behave more reasonably. Still, this makes bash a lot less
> useful than it could be; working around this limitation is painful,
> ugly, and leads to fragile code.
> 
> So, since we cannot "fix" errexit, can we maybe introduce another
> option like "errfail" that behaves like errexit for simple commands,
> but is also logically composable? Let me show what I mean with the
> following pseudo-code:

What does logically composable mean in this context?

Maybe it would be better if you described how you would like the behavior
to differ from errexit.  Like Angel, I see that you want errfail to be
`inherited' by functions, like errexit; inhibited in the same set of
exceptions; but that command substitution failures will cause the shell
to exit.  Is that accurate?

Chet


-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/



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