Groups > comp.lang.python > #20024

Re: python file synchronization

Path	csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!weretis.net!feeder1.news.weretis.net!feeder.erje.net!newsfeed.xs4all.nl!newsfeed6.news.xs4all.nl!xs4all!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail
Return-Path	<python-python-list@m.gmane.org>
X-Original-To	python-list@python.org
Delivered-To	python-list@mail.python.org
X-Spam-Status	OK 0.000
X-Spam-Evidence	'H': 1.00; 'S': 0.00; 'over,': 0.05; 'operation,': 0.09; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'rename': 0.09; 'subject:python': 0.10; 'subject:file': 0.13; '(say': 0.16; '>after': 0.16; '>of': 0.16; 'bieber': 0.16; 'copied.': 0.16; 'different,': 0.16; 'email addr:ix.netcom.com': 0.16; 'email name:wlfraed': 0.16; 'from:addr:ix.netcom.com': 0.16; 'from:addr:wlfraed': 0.16; 'from:name:dennis lee bieber': 0.16; 'message-id:@4ax.com': 0.16; 'received:wlfraed': 0.16; 'tmp': 0.16; 'url:netcom': 0.16; 'url:wlfraed': 0.16; 'wulfraed': 0.16; 'wed,': 0.17; 'wrote:': 0.18; 'received:166': 0.18; 'subject:skip:s 10': 0.18; 'say,': 0.19; 'url:home': 0.21; 'feb': 0.22; '>the': 0.23; 'creating': 0.25; 'suggestion': 0.26; '+0200,': 0.30; 'lock': 0.30; 'operation.': 0.30; 'yesterday,': 0.30; 'actual': 0.32; 'instead': 0.33; 'file': 0.34; 'header:X -Complaints-To:1': 0.34; 'lee': 0.34; 'directory.': 0.34; 'leaves': 0.34; 'to:addr:python-list': 0.35; 'received:org': 0.36; 'affects': 0.37; 'machine': 0.37; 'charset:us-ascii': 0.37; 'problems': 0.38; 'being': 0.40; 'might': 0.40; 'to:addr:python.org': 0.40; 'more': 0.61; 'your': 0.61; 'taking': 0.66; 'special': 0.66; 'dennis': 0.73; 'physical': 0.79; 'dir,': 0.84; 'ready,': 0.91
X-Injected-Via-Gmane	http://gmane.org/
To	python-list@python.org
From	Dennis Lee Bieber <wlfraed@ix.netcom.com>
Subject	Re: python file synchronization
Date	Wed, 08 Feb 2012 09:53:54 -0500
References	<24cb8965-9211-4601-b096-4bf482aead18@h6g2000yqk.googlegroups.com> <20120208034025.GA14347@cskk.homeip.net> <CAH3xUCKhxxb77oXVcA+Ld-+G7NnYdBEYHwCheaTU3C06OhRu6g@mail.gmail.com>
Mime-Version	1.0
Content-Type	text/plain; charset=us-ascii
Content-Transfer-Encoding	7bit
X-Gmane-NNTP-Posting-Host	mobile-166-147-103-043.mycingular.net
X-Newsreader	Forte Agent 6.00/32.1186
X-No-Archive	YES
X-BeenThere	python-list@python.org
X-Mailman-Version	2.1.12
Precedence	list
List-Id	General discussion list for the Python programming language <python-list.python.org>
List-Unsubscribe	<http://mail.python.org/mailman/options/python-list>, <mailto:python-list-request@python.org?subject=unsubscribe>
List-Archive	<http://mail.python.org/pipermail/python-list>
List-Post	<mailto:python-list@python.org>
List-Help	<mailto:python-list-request@python.org?subject=help>
List-Subscribe	<http://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
Newsgroups	comp.lang.python
Message-ID	<mailman.5544.1328712858.27778.python-list@python.org> (permalink)
Lines	30
NNTP-Posting-Host	2001:888:2000:d::a6
X-Trace	1328712858 news.xs4all.nl 6855 [2001:888:2000:d::a6]:34379
X-Complaints-To	abuse@xs4all.nl
Xref	x330-a1.tempe.blueboxinc.net comp.lang.python:20024

Show key headers only | View raw

On Wed, 8 Feb 2012 08:57:43 +0200, Sherif Shehab Aldin
<silentquote@gmail.com> wrote:

>
>After searching more yesterday, I found that local mv is atomic, so instead
>of creating the lock files, I will copy the new diffs to tmp dir, and after
>the copy is over, mv it to actual diffs dir, that will avoid reading It
>while It's still being copied.
>
	Are your tmp directory and your "diffs" directory on the same
physical volume? If so, "mv" is a rename operation, that only affects
the directory information. If the volumes are different, then "mv"
reverts to a copy/delete file operation.

	To avoid problems in the future (say the "diffs" machine is
reconfigured with an additional drive and "tmp" is now mounted on the
new drive) you might be better off taking part of the suggestion to use
a special file name to indicate an "in-work" file...

diffs.timestamp.part

say, and when ready, just

mv diffs.timestamp.part diffs.timestamp

	This leaves them in the same physical location and directory.
-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
        wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/

Back to comp.lang.python | Previous | Next — Previous in thread | Find similar | Unroll thread

Thread

python file synchronization silentnights <silentquote@gmail.com> - 2012-02-07 01:33 -0800
  Re: python file synchronization Cameron Simpson <cs@zip.com.au> - 2012-02-08 14:40 +1100
  Re: python file synchronization Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-02-08 09:53 -0500

csiph-web