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 <gentoo-dev+bounces-40447-garchives=archives.gentoo.org@lists.gentoo.org>) id 1Ny8S3-0001cq-1p for garchives@archives.gentoo.org; Sat, 03 Apr 2010 18:52:17 +0000 Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id 53DCBE09A2; Sat, 3 Apr 2010 18:52:02 +0000 (UTC) Received: from smtp.gentoo.org (smtp.gentoo.org [140.211.166.183]) by pigeon.gentoo.org (Postfix) with ESMTP id 15ED7E0968 for <gentoo-dev@lists.gentoo.org>; Sat, 3 Apr 2010 18:51:49 +0000 (UTC) Received: from [192.168.0.103] (151-1.3-85.cust.bluewin.ch [85.3.1.151]) (using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by smtp.gentoo.org (Postfix) with ESMTP id 4FE431B4017 for <gentoo-dev@lists.gentoo.org>; Sat, 3 Apr 2010 18:51:47 +0000 (UTC) Subject: Re: [gentoo-dev] [RFC] More reliable hiding preserved libraries From: Tiziano =?ISO-8859-1?Q?M=FCller?= <dev-zero@gentoo.org> To: gentoo-dev@lists.gentoo.org In-Reply-To: <201004031238.18500.reavertm@gmail.com> References: <201004031238.18500.reavertm@gmail.com> Content-Type: multipart/signed; micalg="sha1"; protocol="application/x-pkcs7-signature"; boundary="=-2YP8mRFEF5kEzkT6OER3" Organization: Gentoo Date: Sat, 03 Apr 2010 20:51:43 +0200 Message-ID: <1270320703.1230.11.camel@localhost> Precedence: bulk List-Post: <mailto:gentoo-dev@lists.gentoo.org> List-Help: <mailto:gentoo-dev+help@lists.gentoo.org> List-Unsubscribe: <mailto:gentoo-dev+unsubscribe@lists.gentoo.org> List-Subscribe: <mailto:gentoo-dev+subscribe@lists.gentoo.org> List-Id: Gentoo Linux mail <gentoo-dev.gentoo.org> X-BeenThere: gentoo-dev@lists.gentoo.org Reply-to: gentoo-dev@lists.gentoo.org Mime-Version: 1.0 X-Mailer: Evolution 2.28.3.1 X-Archives-Salt: 6a0107c9-c328-4ed5-adb5-62fcd647c192 X-Archives-Hash: bf2f4854bbb9dd57460e8583f0f30937 --=-2YP8mRFEF5kEzkT6OER3 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Am Samstag, den 03.04.2010, 12:38 +0200 schrieb Maciej Mrozowski: > Problem >=20 > ..is known, let me summarize briefly. >=20 > Uninstalling packages providing libraries, without checking reverse runti= me=20 > dependencies of those packages leaves their dependencies unsatisfied (pac= kages=20 > with broken executables and/or shared libs). > Some package managers try their best not to remove said libraries, yet=20 > allowing packages to be removed. > Those orphaned libraries cause problems[1] as build systems of some other= =20 > packages being (re)installed afterwards pick them up and abuse those orph= aned=20 > libraries. (we don't like orphans abused, we prefer them... "gone"). >=20 > Solution >=20 > Now, I suppose there are some ideas how to make orphaned libraries not go= in a=20 > way. Basically then need to be available for system, but hidden for "emer= ge". >=20 > There is opt-out suggestion[2], unfortunately it does not provide any inf= o how=20 > exactly it's supposed to be achieved. As far as portage/pkgcore is concer= ned,=20 > maybe - as Brian Harring suggested - sandbox could be used to somehow "hi= de"=20 > preserved libraries or preserved library directory from ebuild environmen= t=20 > (preserved library directory a'ka "purgatory" - libs could be moved there= when=20 > considered orphaned). >=20 > Opt-in suggestion is as follows: > 1. Use some library path (read by ld loader from environment) and export = it=20 > globally to environment pointing it to preserved library directory. > 2. During "emerge", unset environment variable corresponding to said pres= erved=20 > library directory - orphans are no longer located. > Attached patch for glibc (2.11, but should apply to any other glibc aroun= d)=20 > and uClibc (this one is not tested but should work as well) that makes ld= =20 > loader aware of LD_GENTOO_PRESERVED_LIBRARY_PATH variable. >=20 > (LD_LIBRARY_PATH would work as well, but it's being used widely so cannot= be=20 > safely mangled.. on the second though it can - one could filter out prese= rved=20 > library paths from it during "emerge"). >=20 > Thoughts? Don't fix the hack. Remove the preserve libs "feature", make the PMs check for rdeps per default before unmerging things. Slot libraries where needed, slot dep operators (EAPI 4) will help. And if that doesn't work out we need a separate var to give the PM a hint when API/ABI breakages happen (such that the PM knows when to re-install the rev deps). --=20 Tiziano M=C3=BCller Gentoo Linux Developer Areas of responsibility: Samba, PostgreSQL, CPP, Python, sysadmin, GLEP Editor E-Mail : dev-zero@gentoo.org GnuPG FP : F327 283A E769 2E36 18D5 4DE2 1B05 6A63 AE9C 1E30 --=-2YP8mRFEF5kEzkT6OER3 Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIKbjCCBTMw ggMboAMCAQICAwg/VjANBgkqhkiG9w0BAQUFADB5MRAwDgYDVQQKEwdSb290IENBMR4wHAYDVQQL ExVodHRwOi8vd3d3LmNhY2VydC5vcmcxIjAgBgNVBAMTGUNBIENlcnQgU2lnbmluZyBBdXRob3Jp dHkxITAfBgkqhkiG9w0BCQEWEnN1cHBvcnRAY2FjZXJ0Lm9yZzAeFw0xMDAyMjIxMDQzMzBaFw0x MjAyMjIxMDQzMzBaMD0xFzAVBgNVBAMUDlRpemlhbm8gTfxsbGVyMSIwIAYJKoZIhvcNAQkBFhNk 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