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Re: svn update or rsync - which is best to update live files

From: Blair Zajac <blair_at_orcaware.com>
Date: Sat, 26 Feb 2011 15:26:18 -0800

On Feb 26, 2011, at 2:47 PM, Ryan Schmidt wrote:

> On Feb 25, 2011, at 13:53, Blair Zajac wrote:
>> On 2/25/11 11:39 AM, Christopher D Haakinson wrote:
>>> Now I've come to the point in my development where I need to
>>> figure out what's
>>> the best method for transferring my svn files to my live site.
>>> I've read that I should use a post-commit hook, which is fine I'm
>>> using a
>>> pre-commit hook already so I'm aware of how they work.
>>> My main question is: Which method is best for updating my live
>>> files? Should I
>>> use rsync in my post hook or should I use svn update?
>>> http://subversion.apache.org/faq.html#website-auto-update this
>>> page recommends
>>> using svn update, but I wanted to get some input from the
>>> community too.
>>> Thanks in advance!
>> First, both svn and rsync do atomic replaces of the file, so you
>> don't have to worry about the live files being observed in some odd
>> state.
> Of course you do. The individual files may be atomically replaced,
> but the entire set of files won't be. If, like most web sites, your
> site is made with a scripting language, and file A includes file B,
> and both files have been changed, there will probably be a time
> during the update when A has been updated and B has not, or vice
> versa.

Well, you're going past the original question. Neither rsync nor svn
help with that case, as there aren't atomic updates to sets of files,
which you state in the thread linked below.

> Here is a previous discussion with recommendations. See especially
> the paragraph that starts "For finally deploying a site to the
> production server" and the example that follows:
> http://svn.haxx.se/users/archive-2009-04/0083.shtml

Right, the symlink approach gets you 90% there.

But even this doesn't get you 100% of the way there, if the browser
downloads C and D and in between the symlink is changed (not talking
about when A includes B that is a single GET).

Received on 2011-02-27 00:26:57 CET

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