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Re: Moving from one svn server to another, despite heavy use of absolute external references?

From: Hari Kodungallur <hkodungallur_at_gmail.com>
Date: Tue, 28 Jul 2009 14:36:17 -0700

On Tue, Jul 28, 2009 at 1:56 PM, Dan Stromberg <dstromberglists_at_gmail.com>wrote:

> We have 3 subversion repositories on a single subversion server, and
> we want to move them to a new subversion server.
>
> This seems simple enough - until you start to consider all the
> absolute external references (in branches and tags) we'd want to think
> about updating - and we're a little skittish about updating our tags.
>
> I calculated that for one of the 3 repos, if we have an automatic
> process that takes about a half hour to update one branch or tag, it'd
> take about 9 days of continuous updating to adjust all of our
> externals. That's kind of a long time, and I'm afraid the estimate is
> more likely low than high.

Half hour to update one branch/tag? So, you have hundreds of sub directories
in each branch/tag and each directory has its own set of externals?

>
>
> There's also the option of generating a list of all the hostnames and
> IP's used in our external references and stealing those hostnames
> and/or IP's, so that the externals don't need to be updated.

This is not a bad idea at all. Also, it likely is not a "list of" hostnames
and IPs; should be just one IP and hostname. Since the 3 repos were on one
single server, the externals should be using either the hostname of that
server or the IP of that server.

>
>
> Has someone else already been down this road?
>
> I have a tool that does a reasonable job of updating external
> references by piping them all through sed, but it's never been used on
> this scale. If there's something in common use, I'd probably use that
> instead. Is there something like this available?'

Have you tried svnmucc? I believe there was also a script (python?) that
could be used to update the externals. I forget it now and can't seem to
find it.

Also, what are the externals actually referring to? Are they directories
within the same repo? If that is the case, the latest svn supports relative
URLs. If you are taking the trouble to update the externals anyway, may be
you should make them relative URLs (wherever applicable) so that this is not
a problem in the future.

>
>
>
> What are best practices on this sort of scenario?
>
>
> (No, I wouldn't have architected it this way at all, but I'm afraid
> we're stuck with it. I'd've used ant/make variables or environment
> variables instead, and failing that symlinks instead, and failing that
> relative external references, and failing that a DNS CNAME, or at
> absolute worst a series of _hosts_ files for the Subversion server)
>
> Thanks!

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Received on 2009-07-28 23:37:14 CEST

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