From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mark H Weaver <mhw@netris.org>
Subject: Re: [PATCH 1/2] build: union: Add create-all-directory? parameter to
	union-build
Date: Fri, 24 Feb 2017 17:13:53 -0500
Message-ID: <874lzjb5jy.fsf@netris.org>
References: <20170218004427.12392-1-huang_ying_caritas@163.com>
	<87tw7jn4mo.fsf@163.com> <20170224150256.641cb08d@scratchpost.org>
Mime-Version: 1.0
Content-Type: text/plain
Return-path: <guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org>
Received: from eggs.gnu.org ([2001:4830:134:3::10]:37310)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <mhw@netris.org>) id 1chO9I-0006TI-Rz
	for guix-devel@gnu.org; Fri, 24 Feb 2017 17:15:37 -0500
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <mhw@netris.org>) id 1chO9F-0006X0-OX
	for guix-devel@gnu.org; Fri, 24 Feb 2017 17:15:36 -0500
Received: from world.peace.net ([50.252.239.5]:39531)
	by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16)
	(Exim 4.71) (envelope-from <mhw@netris.org>) id 1chO9F-0006RX-KQ
	for guix-devel@gnu.org; Fri, 24 Feb 2017 17:15:33 -0500
In-Reply-To: <20170224150256.641cb08d@scratchpost.org> (Danny Milosavljevic's
	message of "Fri, 24 Feb 2017 15:02:56 +0100")
List-Id: "Development of GNU Guix and the GNU System distribution."
	<guix-devel.gnu.org>
List-Unsubscribe: <https://lists.gnu.org/mailman/options/guix-devel>,
	<mailto:guix-devel-request@gnu.org?subject=unsubscribe>
List-Archive: <http://lists.gnu.org/archive/html/guix-devel/>
List-Post: <mailto:guix-devel@gnu.org>
List-Help: <mailto:guix-devel-request@gnu.org?subject=help>
List-Subscribe: <https://lists.gnu.org/mailman/listinfo/guix-devel>,
	<mailto:guix-devel-request@gnu.org?subject=subscribe>
Errors-To: guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org
Sender: "Guix-devel" <guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org>
To: Danny Milosavljevic <dannym@scratchpost.org>
Cc: guix-devel@gnu.org, Alex Kost <alezost@gmail.com>

Danny Milosavljevic <dannym@scratchpost.org> writes:

> yeah, I've looked at it and I see what you are trying to do.
>
> You modified 'union to replicate the directory tree and symlink only
> the non-directory files - in order to be able to add "fonts.dir" in
> those directories.

If the purpose here is to facilitate mutating anything in the store,
then we cannot accept this.  The entire design is Guix is based on store
items being immutable, and we assume this throughout the code, most
notably by assuming that store items and parts of store items can be
aliased instead of copied.

If you want to add something to your profile, e.g. fonts.dir, then use
profile hooks for that.  See %default-profile-hooks in
guix/profiles.scm.  However, we already have a hook to build fonts.dir,
so I'm not sure what's missing here.

If we've misunderstood the rationale for this patch, can you help us
understand what you're trying to do?

     Thanks,
       Mark