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Re: Race in bash-4.3 'typeset'?


From: Stuart Shelton
Subject: Re: Race in bash-4.3 'typeset'?
Date: Tue, 25 Oct 2016 18:47:30 +0100

> On 25 Oct 2016, at 17:36, Eduardo Bustamante <address@hidden> wrote:
> 
> What version of bash are you using Stuart? typeset -p should work for
> local variables too in any recent bash version.

typeset omitting existing variables or failing and causing a SIGPIPE I’ve seen 
with Ubuntu 14.04 LTS’ bash-4.3.11(1).  The immediately prior example (where 
variables declared local but unset in terms of value weren’t causing typeset to 
return successfully) was run on Ubuntu 16.10’s bash-4.3.46(1).  This later 
version doesn’t seem to be affected by the apparently non-deterministic 
original problem, however.

I’ve not seen any case where calling typeset again immediately after having 
called it and received an anomalous response doesn’t respond correctly - so my 
current solution is simply to invoke typeset twice… but the presence of this 
discrepancy is worrying.

If this isn’t expected bash-4.3 behaviour, then it’s entirely possible that 
Canonical are doing something strange here, of course...


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