From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 112648 invoked by alias); 23 May 2016 19:02:23 -0000 Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Received: (qmail 112631 invoked by uid 89); 23 May 2016 19:02:23 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-1.4 required=5.0 tests=BAYES_20,RP_MATCHES_RCVD,SPF_HELO_PASS autolearn=ham version=3.3.2 spammy=marco.atzeri@gmail.com, marcoatzerigmailcom, cname, filefrom X-HELO: mx1.redhat.com Received: from mx1.redhat.com (HELO mx1.redhat.com) (209.132.183.28) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with (AES256-GCM-SHA384 encrypted) ESMTPS; Mon, 23 May 2016 19:02:12 +0000 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 535CF711E5 for ; Mon, 23 May 2016 19:02:11 +0000 (UTC) Received: from [10.3.116.141] (ovpn-116-141.phx2.redhat.com [10.3.116.141]) by int-mx10.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u4NJ2AUZ022507 for ; Mon, 23 May 2016 15:02:11 -0400 Subject: =?UTF-8?Q?Re:_tar_incremental_backups_and_ctime=e2=80=8f_problem?= To: cygwin@cygwin.com References: <9fdf98cf-e3d1-e453-1c98-2c206afe81c9@gmail.com> <09f604cd-61df-e0c7-b313-1dcf1ef59b4e@gmail.com> <574313B3.3090703@redhat.com> From: Eric Blake Openpgp: url=http://people.redhat.com/eblake/eblake.gpg Message-ID: <574353B2.8010006@redhat.com> Date: Mon, 23 May 2016 19:02:00 -0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="M4NcLrs8uAQFxQbqs7St26AKn82gPogKD" X-IsSubscribed: yes X-SW-Source: 2016-05/txt/msg00272.txt.bz2 --M4NcLrs8uAQFxQbqs7St26AKn82gPogKD Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Content-length: 1610 On 05/23/2016 10:56 AM, x y wrote: >> It is always possible to create file list with find and use that >> to tar whatever using --files-from=3DFILE option >=20 >> I don't see the need to change tar behaviour to meet your wish. >=20 > Hi Marco, >=20 > Consider that you are working in the IT department of a company and > you have thousands of documents in your file server. Concerning the > --file-from option, how can you guess the name of the files which are > just only going to be viewed by the workers? Those files would be not > modified but since the ctime stamp will be updated, they will be > included in the next incremental backup. Why to lose time with the > --files-from option and make things more difficult? Adding an option > to tar.exe to ignore the cname time stamp during differential \ > incremental backups should be possible. This should be the natural > method. Tools like rsync does not suffer from such problems so my > request should make sense. If it makes that much sense, then propose the extension upstream (bug-tar@gnu.org); once upstream implements it, Cygwin will pick it up automatically. Until then, I don't see a reason for Cygwin to needlessly differ from upstream. >=20 > On Mon, May 23, 2016 at 6:35 PM, Marco Atzeri wr= ote: >> On 23/05/2016 16:57, x y wrote: >>>> >>>> mtime is fakeable, ctime is not. Using only mtime makes it likely that You're still top-posting. It's okay to trim the portion of the email you don't reply to. --=20 Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org --M4NcLrs8uAQFxQbqs7St26AKn82gPogKD Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" Content-length: 604 -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 Comment: Public key at http://people.redhat.com/eblake/eblake.gpg Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBCAAGBQJXQ1OyAAoJEKeha0olJ0NqaaoH/AyRVQw6ud41kcIpjSmOhyTX fLGSuQCszWlqs4HfhqFoYXq15V8kWWQQ9DNIuK5ktv6bkSp7YRs4MxcKLbDIMxxv jYEfyjCk4H0ZEsXuEgCqOUiiwFFx2IOd2EUfA6deV4z0tMNPJ0L90EJLVxuatxrG Bxx/3k6VyBzTdes6ARfJuzQ8+Tz6j7V92tBLSonhQEb/7eGpqFAAdtNOBWMvcYYX j6I36daCzyQu84mcZ8jRCuXEuLYtXY+5oq9hibRnp+XvBgWCAVo2McYBBITmvWFz NNZJKLmaPEsZTC5UJhGe7+nLlNG/6MMbI3uC4aGV4jz6QMCZdZXvukj9vkRNXvs= =iiLP -----END PGP SIGNATURE----- --M4NcLrs8uAQFxQbqs7St26AKn82gPogKD--