X-Recipient:	archive-cygwin AT delorie DOT com
DomainKey-Signature:	a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:subject:to:references:from:message-id:date
	:mime-version:in-reply-to:content-type; q=dns; s=default; b=uhQ6
	8Bzb1OO0FXGUqLXIDFHPYjYJH92uzT6ZnZUpadlveLKFJjRrPP7Fdx/4bCMpZ5uM
	8WAJHAB4tLDzvISqSKXv7amNKs8zu20I3bLLd2VWRXd50kB9pHH9VSPB5Q5nWWVF
	0ct8K560qD9X3hC5CLxce3QI82fAK/qNuXZiH10=
DKIM-Signature:	v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:subject:to:references:from:message-id:date
	:mime-version:in-reply-to:content-type; s=default; bh=rgWSzELNYL
	b+QzHytY1sOjtTBhY=; b=fBluhEl2GH2ss3ZW/JCvo7SGsu1lZBuOLrfz60nQ+K
	38Lt/hhtlvHfm+F3KnWnCFQNmwPHtAmmuzG4xjPNnZ5IGtFGsj3QqVMMpKo/q/Km
	X6rN4A5G6kakbQMEh946fYSTKUv2G+F9vAJKistVYjYvC1t21X7eeSqo18ovo/B/
	g=
Mailing-List:	contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id:	<cygwin.cygwin.com>
List-Subscribe:	<mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive:	<http://sourceware.org/ml/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender:	cygwin-owner AT cygwin DOT com
Mail-Followup-To:	cygwin AT cygwin DOT com
Delivered-To:	mailing list cygwin AT cygwin DOT com
Authentication-Results:	sourceware.org; auth=none
X-Virus-Found:	No
X-Spam-SWARE-Status:	No, score=-1.9 required=5.0 tests=BAYES_00,KAM_LAZY_DOMAIN_SECURITY,RP_MATCHES_RCVD,SPF_HELO_PASS autolearn=ham version=3.3.2 spammy=H*f:sk:87a8lci, H*i:sk:87a8lci, H*MI:sk:87a8lci, Repin
X-HELO:	mx1.redhat.com
Subject:	Re: How to install a custom permanent postinstall handler?
To:	cygwin AT cygwin DOT com
References:	<838469265 DOT 20160401235308 AT yandex DOT ru> <87a8lcicxg DOT fsf AT Rainer DOT invalid>
From:	Eric Blake <eblake AT redhat DOT com>
Openpgp:	url=http://people.redhat.com/eblake/eblake.gpg
Message-ID:	<56FFD48C.4000802@redhat.com>
Date:	Sat, 2 Apr 2016 08:17:48 -0600
User-Agent:	Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.7.1
MIME-Version:	1.0
In-Reply-To:	<87a8lcicxg.fsf@Rainer.invalid>
X-IsSubscribed:	yes

--VnaiF3WLw95KNG0amGAD9k8ChEl7i2Cx6
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable

On 04/02/2016 03:21 AM, Achim Gratz wrote:
> Andrey Repin writes:
>> Couple of my scripts rely on ASH/DASH functionality that is not present =
in
>> BASH. (Namely "local -".)
>> To amend that, I make a symlink /bin/sh =3D /bin/dash .
>> But every time bash update, it overwrite the link.
>=20
> I think the correct course of action would be to put /bin/sh under
> control of the alternatives system.

Since I maintain both dash and bash, I'm game for setting up /bin/sh as
an alternative. However, I've never targeted the alternatives system
before as a package maintainer; any advice on docs or an example that I
could copy from?  I would probably make the defaults give bash higher
priority over dash, but with the alternatives in place, it would be easy
for a local user to swap the priorities on their system; I'd probably
also want to provide a convenience script to make swapping default sh an
easier task than users having to actually call directly into the
alternatives system.

--=20
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


--VnaiF3WLw95KNG0amGAD9k8ChEl7i2Cx6
Content-Type: application/pgp-signature; name="signature.asc"
Content-Description: OpenPGP digital signature
Content-Disposition: attachment; filename="signature.asc"

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2
Comment: Public key at http://people.redhat.com/eblake/eblake.gpg
Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/

iQEcBAEBCAAGBQJW/9SNAAoJEKeha0olJ0NqVZgH/ivsPHKiPNVGlr1sAYcBTL3P
cjIdjD55ZobU6YHzuLd/XDwDpkWPQaqRwEEYOTaP/TtNuXDxpYNhZzHSR5a3lvzW
/k01sa1NqxkDttGCDXV/Pe+HU/OoOhGjuFVby0HhdLN0s5ADapIp+yFaZT6IvyQv
O8C4TpB0RCWxo4x4sbHOd1PmoRy8PcAixNj3F/rJ25Z0dXqllU1mTnetWqMOVqiT
HMggYVduQHj+PL2WNjKILMxNeKLsFd+Z7pFj0QkCIm7TF6+RpjtPxZj7iAw2U04V
QOE7qDa0XgboY8fK5oR6OLwOILRf7w/AGe6pQQGc4FDqPXJrckzMvGd2LFXxZMU=
=oOqP
-----END PGP SIGNATURE-----

--VnaiF3WLw95KNG0amGAD9k8ChEl7i2Cx6--

- Raw text -