From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pigeon.gentoo.org ([208.92.234.80] helo=lists.gentoo.org) by finch.gentoo.org with esmtp (Exim 4.60) (envelope-from ) id 1MqvQx-0002Ak-JV for garchives@archives.gentoo.org; Thu, 24 Sep 2009 21:00:59 +0000 Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id CD391E08C3; Thu, 24 Sep 2009 21:00:58 +0000 (UTC) Received: from smtp.gentoo.org (smtp.gentoo.org [140.211.166.183]) by pigeon.gentoo.org (Postfix) with ESMTP id 919C2E08C3 for ; Thu, 24 Sep 2009 21:00:58 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp.gentoo.org (Postfix) with ESMTP id 2B88067B96 for ; Thu, 24 Sep 2009 21:00:58 +0000 (UTC) X-Virus-Scanned: amavisd-new at gentoo.org X-Spam-Score: -3.215 X-Spam-Level: X-Spam-Status: No, score=-3.215 required=5.5 tests=[AWL=-0.616, BAYES_00=-2.599] Received: from smtp.gentoo.org ([127.0.0.1]) by localhost (smtp.gentoo.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id OPrakdZxyAXV for ; Thu, 24 Sep 2009 21:00:51 +0000 (UTC) Received: from lo.gmane.org (lo.gmane.org [80.91.229.12]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.gentoo.org (Postfix) with ESMTP id 0C0C367AE7 for ; Thu, 24 Sep 2009 21:00:49 +0000 (UTC) Received: from list by lo.gmane.org with local (Exim 4.50) id 1MqvQk-00009p-3r for gentoo-devhelp@gentoo.org; Thu, 24 Sep 2009 23:00:46 +0200 Received: from athedsl-388099.home.otenet.gr ([79.131.68.1]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 24 Sep 2009 23:00:46 +0200 Received: from realnc by athedsl-388099.home.otenet.gr with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 24 Sep 2009 23:00:46 +0200 X-Injected-Via-Gmane: http://gmane.org/ To: gentoo-devhelp@lists.gentoo.org From: Nikos Chantziaras Subject: [gentoo-devhelp] Re: Writing ebuilds that replace others but with different name Date: Fri, 25 Sep 2009 00:00:27 +0300 Organization: Lucas Barks Message-ID: References: <4ABBD8C1.5040003@j-schmitz.net> Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Development-related help X-BeenThere: gentoo-devhelp@gentoo.org X-BeenThere: gentoo-devhelp@lists.gentoo.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: athedsl-388099.home.otenet.gr User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.4pre) Gecko/20090923 Thunderbird/3.0b4 In-Reply-To: <4ABBD8C1.5040003@j-schmitz.net> Sender: news X-Archives-Salt: c23bb8aa-f977-4613-949f-343df0b7cd1a X-Archives-Hash: f60de3cf344fa3cfacc77cb0d73343f6 On 09/24/2009 11:38 PM, Justin wrote: > Nikos Chantziaras wrote: >> I seem to have some fundamental "flaw" in portage. It seems I am not >> able to write an ebuild that will in effect be able to replace another >> one but with a different name. >> >> With RPMs, no matter how the RPM is named, it has "provides" data in it. >> Is there some similar mechanism in portage? It seems to me that if the >> name of an ebuild is changed, then *all* ebuilds depending on it will >> have to change too. That looks like a PITA to me if it's true. >> >> For example, if I have an overlay that provides alternative/altered >> packages of already existing ones in the portage tree, they will "clash" >> with portage. Let's assume that my overlay provides an ebuild called >> "foo-alt" which is a variation of a package in portage called "foo", but >> is totally compatible with it. What I'm looking for is being able to >> emerge "foo-alt", but have the ebuild state clearly that it provides the >> "foo" dependency, so ebuilds depending on "foo" will be satisfied if >> "foo-alt" is installed but "foo" isn't. >> >> Possible? >> >> > Thats's what virtuals are good for. As an example see virtual/jre. > But in principle you are right. renaming a package is a headache and > should really be avoided. I'm not sure how I can use virtuals to provide an alternative but completely compatible package. I'll give a straight example: In my overlay, there's "x11-libs/qt-opengl-alt". It is a variation of qt-opengl, providing and *replacing* all files in it. However, if I unmerge qt-opengl and install qt-opengl-alt instead, even though the installed packages depending on qt-opengl work perfectly fine with it (it's fully compatible), an "emerge -uDN world" will try to pull qt-opengl back in because it thinks it's missing (and this will of course result in a file collision since qt-opengl-alt is also installed, providing the same files). Changing the category also doesn't help ("x11-libs-alt/qt-opengl" for example). So virtuals don't seem to have anything to do with with my problem. What's missing is something like RPM's "provides" (so the qt-opengl-alt ebuild would be able to say "I provide the qt-opengl package.) From your answer, I take it that portage doesn't offer anything like this and the ebuild's name is hardcoded to be the package it provides :P