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From: Achim Gratz <Stromeko AT nexgo DOT de>
To: cygwin AT cygwin DOT com
Subject: Re: [ANNOUNCEMENT] Updated: dash-0.5.9.1-1
References: <485AF0C5-7E1B-49AA-BE3E-C3717DA3268B AT solidrocksystems DOT com>	<58b811b2 DOT 261d9d0a DOT 7c759 DOT 299d AT mx DOT google DOT com>	<db63a27c-a322-7fce-1a94-a1371d387c50 AT gmail DOT com>	<acb13acc-28e8-c508-1b55-c88d404f9c1b AT redhat DOT com>
Date: Thu, 02 Mar 2017 19:28:04 +0100
In-Reply-To: <acb13acc-28e8-c508-1b55-c88d404f9c1b@redhat.com> (Eric Blake's	message of "Thu, 2 Mar 2017 08:29:01 -0600")
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Eric Blake writes:
> To reiterate my answer in different terms:
>
> If you can convince Fedora to switch /bin/sh to dash, then I will
> immediately follow in Cygwin.  Until then, I'm worried that there are
> enough scripts in the wild that use bashisms and will therefore break if
> /bin/sh is not bash, even though that number has reduced somewhat since
> Debian made their switch.  Trying to make Cygwin the guinea pig, instead
> of Fedora, is going about it backwards (you WANT the change to be done
> in a place where there is plenty of manpower to deal with the fallout,
> and Fedora has more manpower than Cygwin).

Ack.

I want to put forward that we should get the postinstall scripts moved
from bash to dash as a first step even then.

> I'm still toying with the idea of doing a test release of both bash and
> dash that flips /bin/sh between them; but I'm still stuck on the problem
> that a user MUST upgrade (or downgrade) both packages in tandem, or else
> risk being left without a /bin/sh at all.  Help would be appreciated in
> figuring out the problem (telling me that "dash is faster than bash" is
> not help, nor is telling me that "portable shell scripts don't care if
> /bin/sh is bash or dash" - I already know those points. What I don't
> know is how many non-portable scripts are out there, so how much
> breakage would I be causing by forcing those non-portable scripts to
> deal with their non-portability, and how to minimize the even-worse
> breakage of an upgrade scenario that leaves no /bin/sh at all).

I'd test that in production.  I don't really need handholding
w.r.t. update and potential downgrade process, so if you'd put the two
packages somewhere into an unofficial repo that would work for me.


Regards,
Achim.
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