From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: ludo@gnu.org (Ludovic =?iso-8859-1?Q?Court=E8s?=) Newsgroups: gmane.lisp.guile.devel Subject: Re: mtime of fresh .go Date: Tue, 20 Jul 2010 00:17:08 +0200 Message-ID: <87wrsrxgkb.fsf@gnu.org> References: <87mxtrdf42.fsf@gnu.org> <87vd8cv2v7.fsf@gnu.org> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Trace: dough.gmane.org 1279577839 28662 80.91.229.12 (19 Jul 2010 22:17:19 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Mon, 19 Jul 2010 22:17:19 +0000 (UTC) Cc: guile-devel@gnu.org To: Andy Wingo Original-X-From: guile-devel-bounces+guile-devel=m.gmane.org@gnu.org Tue Jul 20 00:17:17 2010 Return-path: Envelope-to: guile-devel@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1OayeD-0007Qi-2H for guile-devel@m.gmane.org; Tue, 20 Jul 2010 00:17:17 +0200 Original-Received: from localhost ([127.0.0.1]:52939 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1OayeC-0007G3-0M for guile-devel@m.gmane.org; Mon, 19 Jul 2010 18:17:16 -0400 Original-Received: from [140.186.70.92] (port=43528 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1Oaye8-0007FC-88 for guile-devel@gnu.org; Mon, 19 Jul 2010 18:17:13 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.69) (envelope-from ) id 1Oaye6-0004rj-SK for guile-devel@gnu.org; Mon, 19 Jul 2010 18:17:12 -0400 Original-Received: from mail2-relais-roc.national.inria.fr ([192.134.164.83]:45715) by eggs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1Oaye6-0004rc-Mo for guile-devel@gnu.org; Mon, 19 Jul 2010 18:17:10 -0400 X-IronPort-AV: E=Sophos;i="4.55,228,1278280800"; d="scan'208";a="55814339" Original-Received: from reverse-83.fdn.fr (HELO nixey) ([80.67.176.83]) by mail2-relais-roc.national.inria.fr with ESMTP/TLS/DHE-RSA-AES128-SHA; 20 Jul 2010 00:17:08 +0200 X-URL: http://www.fdn.fr/~lcourtes/ X-Revolutionary-Date: 2 Thermidor an 218 de la =?iso-8859-1?Q?R=E9volution?= X-PGP-Key-ID: 0xEA52ECF4 X-PGP-Key: http://www.fdn.fr/~lcourtes/ludovic.asc X-PGP-Fingerprint: 83C4 F8E5 10A3 3B4C 5BEA D15D 77DD 95E2 EA52 ECF4 X-OS: x86_64-unknown-linux-gnu In-Reply-To: (Andy Wingo's message of "Mon, 19 Jul 2010 21:10:20 +0200") User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.2 (gnu/linux) X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-BeenThere: guile-devel@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Developers list for Guile, the GNU extensibility library" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: guile-devel-bounces+guile-devel=m.gmane.org@gnu.org Errors-To: guile-devel-bounces+guile-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.lisp.guile.devel:10698 Archived-At: Hello! Andy Wingo writes: > On Mon 19 Jul 2010 00:31, ludo@gnu.org (Ludovic Court=C3=A8s) writes: > >> Andy Wingo writes: >> >>> On Fri 16 Jul 2010 10:07, ludo@gnu.org (Ludovic Court=C3=A8s) writes: >>> >>>> commit 535fb833b34dfc3cc11a679d39390b06fd7e9180 >>>> Author: Andy Wingo >>>> Date: Fri Jun 5 10:51:21 2009 +0200 >>>> >>>> stamp .go with timestamp of .scm; a fresh go has same mtime of .= scm >>>> >>>> * libguile/load.c (compiled_is_fresh): Rename from compiled_is_n= ewer. >>>> Check that the mtines of the .go and .scm match exactly, so we= don't >>>> get fooled by rsync-like modifications of the filesystem. >>>> >>>> When packaging things =E2=80=9Cnormally=E2=80=9D, the .go has an mtime= strictly greater >>>> than that of the source file, so checking for equality doesn=E2=80=99t= work. >>> >>> But when reinstalling code from a binary packaging system, sometimes the >>> mtime can go backwards. >> >> Please forgive my ignorance, but can you give an example of how this can >> happen? > > Well there are two cases really: > > * RPM or Deb systems typically timestamp their files based on the times > they were built, not installed, and we don't have guarantees that > upgrading a package won't actually move the mtime into the past. What matters is that the mtime(.go) >=3D mtime(.scm), and I=E2=80=99d expec= t it to be preserved by packaging systems, even after an upgrade, no? (My understanding is that RPMs/Debs are tar-like archives containing meta-data such as the mtime, which is restored upon extraction.) > * When installing source code (via _SOURCES / _DATA), you don't have > any guarantees about the relations between the times of the SOURCE > and DATA files, *as installed*. Apparently =E2=80=9Cmake install=E2=80=9D preserves mtimes on my system. I= OW, since uninstalled .gos have mtime >=3D uninstalled .scms, the same holds for installed .gos and .scms. We=E2=80=99d need to ask the Automake people to check whether this is alway= s the case. Thanks, Ludo=E2=80=99.