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Re: bash drops errexit option in sourced file


From: Chet Ramey
Subject: Re: bash drops errexit option in sourced file
Date: Mon, 03 Dec 2012 11:07:50 -0500
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:16.0) Gecko/20121010 Thunderbird/16.0.1

On 12/3/12 10:50 AM, Robert Schiele wrote:
> On Mon, Dec 3, 2012 at 4:25 PM, Chet Ramey <address@hidden> wrote:
>> Since the `source' command is called in a context where all commands within
>> it should have the `errexit' flag disabled, bash chooses to satisfy this
>> requirement by turning off the flag that (internally) represents errexit.
>> Under most circumstances, however, that state is externally visible as the
>> value of the -e option.
>>
>> Note that the behavior of suppressing the effect of the errexit option is
>> correct.  The value of the -e option in $- should be unaffected, though.
> 
> Ah, now I start to understand how this is supposed to work. I also
> realized that it is not possible within the function to turn on the
> flag again with another internal set -e. Is that also part of the
> design, meaning there is no way to have an effective set -e within a
> function in case it was called in that context?

Correct.  When called in a context where errexit is ignored, attempts to
turn errexit on are ineffective.

-- 
``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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