Dash as default shell

Stephen John Smoogen smooge at gmail.com
Mon Oct 6 14:59:09 UTC 2014

On 6 October 2014 00:06, Paolo Bonzini <pbonzini at redhat.com> wrote:

> Il 02/10/2014 11:04, Zdenek Kabelac ha scritto:
> > It used to give significant boost for automake & libtool based software
> > - however at some point libtool started to use bashisms and so you
> > cannot just replace  /bin/sh -> dash - as build will fail.
> This is wrong.
> libtool detects whether you can use bashisms, and falls back to POSIX
> shell constructs if it cannot use them.  The non-POSIX constructs are
> usually faster because they do not need to fork() the shell.  Autoconf
> does the same.  dash rejects some of these constructs, and accept others.

Actually this might be the most important item in the whole conversation
about moving to dash. If dash excepts some bashisms and not others... it
isn't a 'default posix' shell and we really need someone to audit it and
not expect that just because XYZ project uses it.. that they audited it.
[And no this isn't a I want to keep bash as root shell argument, I don't
really care what the default exec is as much as it is audited and secure.
While it is clear that bash hasn't been that iwth only one maintainer.. I
have no idea about dash and I am not sure who does.]

Stephen J Smoogen.
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