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From Nico Kadel-Garcia <nka...@gmail.com>
Subject Re: software distribution with subversion
Date Fri, 01 Feb 2013 04:42:12 GMT
On Thu, Jan 31, 2013 at 9:18 PM, Jason Keltz <jas@cse.yorku.ca> wrote:
> On 31/01/2013 9:13 PM, Ryan Schmidt wrote:

>> Subversion is not a software distribution tool; it is a document and
>> revision management system. Use a different tool. As someone else said,
>> rsync seems like a good tool for this job; I didn't understand why you think
>> using rsync directly between your file server and your clients won't work.
>>
>
> See my email to Les...  If only the rsync server could save a copy of the
> file checksums when it runs, it would probably decrease the sync time by
> half and save a whole lot of disk activity...

This.... sounds like somone wants to use the same screwdriver for all
screws in this birdhouse.

It's theoretically possible to set a canonical Subversion and
auto-propagate changes to it, from the "file server" or from the an
rsynced copy of the fileserver with a local working copy on the
Subversion master. But it's going to be bulky, and slow. If that 60
GBytes has a lot of churn due to rapidly changing binaries or
extensive static database files, it's going to get awkward indeed. And
because the "file server" you're propagating these changes from is
neither a Subversion server, nor a Subversion client, it's much
harder. Moreover, this doesn't seem to be the kind of "rollback the
changes to a well-defined date" that Subversion does so well,a nd the
changes from the master get fed to a trunk and will then have to be
propagated to branches., and each machine will need a different
branch.

This.... gets tricky. One can differentiate among the slightly
different environments by maintaining a trunk and merging the changes
to the branches, but that can get awkward. Is it possible to set up
tags that haven "svn:external" settings that point to sets of software
from the master, and then the individual hosts are configured locally
and have their changes propagated to the branches on the master?

And you know, this sounds like an absolute flipping deployment
disaster I dealt with about 12 years ago. The site architect thought
the clever thing to do was make a complete tarball bundle for all
deployments, and the whole compressed tarball had to be pushed *every
time*, and releases could only happen with the complete tarball.
Various forms of chaos ensued. I taught them to use packages, to
deploy kernels, in particular, as a separate object so they could be
deployed separately and with rollback separate from the rest of the
system. This fixed the ongoing problem that any one component that
failed would stop the *whole* deployment and push back even the
smallest fixes for as much as six months.

So while I've offered some hints, I'm gong to really suggest to Jason
that he think hard about modularizing the components of this set of
packages before he even starts this project.

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