From owner-freebsd-ports@FreeBSD.ORG  Mon Aug 18 18:31:04 2003
Return-Path: <owner-freebsd-ports@FreeBSD.ORG>
Delivered-To: freebsd-ports@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id C971737B401
	for <ports@freebsd.org>; Mon, 18 Aug 2003 18:31:04 -0700 (PDT)
Received: from hueymiccailhuitl.mtu.ru (hueytecuilhuitl.mtu.ru
	[195.34.32.123])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 83A0C43F3F
	for <ports@freebsd.org>; Mon, 18 Aug 2003 18:31:03 -0700 (PDT)
	(envelope-from sem@ciam.ru)
Received: from ciam.ru (ppp134-118.dialup.mtu-net.ru [62.118.134.118])
	by hueymiccailhuitl.mtu.ru (Postfix) with ESMTP
	id E52EE1CA270; Tue, 19 Aug 2003 05:31:00 +0400 (MSD)
	(envelope-from sem@ciam.ru)
Message-ID: <3F417DDC.3060501@ciam.ru>
Date: Tue, 19 Aug 2003 05:31:08 +0400
From: Sergey Matveychuk <sem@ciam.ru>
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; ru-RU;
	rv:1.3) Gecko/20030309
X-Accept-Language: ru-ru, ru
MIME-Version: 1.0
To: Kris Kennaway <kris@obsecurity.org>
References: <3F4037B9.1010604@ciam.ru>
	<20030818051533.GA70270@rot13.obsecurity.org> <3F40CC65.1000204@ciam.ru>
	<20030818195930.GB73409@rot13.obsecurity.org> <3F4131D8.2070101@ciam.ru>
	<20030818201546.GA73716@rot13.obsecurity.org> <3F414B89.6090304@ciam.ru>
	<20030818224002.GA74570@rot13.obsecurity.org>
In-Reply-To: <20030818224002.GA74570@rot13.obsecurity.org>
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit
cc: ports@freebsd.org
Subject: depend on feature (was: Apache dependence)
X-BeenThere: freebsd-ports@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Porting software to FreeBSD <freebsd-ports.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-ports>,
	<mailto:freebsd-ports-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-ports>
List-Post: <mailto:freebsd-ports@freebsd.org>
List-Help: <mailto:freebsd-ports-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-ports>,
	<mailto:freebsd-ports-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 19 Aug 2003 01:31:05 -0000

Kris Kennaway wrote:
> If you don't override the default value the situation is no different
> to now.  It probably won't actually install a second version of
> apache, because the *_DEPENDS should be on a file that is common to
> all versions of apache, but it might record the wrong package
> dependency information when registering the port installation.

We can implement depending on a FEATURE (common idea of lev@freebsd.org 
concretized by me):
Some port climes itself as feature provider by setting FEATURE variable.
E.g. FEATURE=apache
This feature save with port or separately in PKG_DBDIR.

A port depend on this feature claims it with *_DEPENDS.
E.g. BUILD_DEPENDS=apache
We can recognize it with ":dir" part absent. The port system looks for 
this feature, found appropriated port and records dependency information 
there.

Merits is obvious.
Fully backward compatible.
Cost: need patch pkg_install and bsd.port.mk.

What do you think?

----
Sem.