Update all modx sites on server

We allready have 5 MODx (Evolutuion) sites. It looks like we will have at least 100 within one year, so I’m looking for a multi-site update solution.

I’m planning to build a PHP script that copies the new files to all the sites (quite easy to do). After that it will run the database queries in the install directory ( setup.sql & setup_data.sql ? ) for all the sites.

Will that work? Or did I forget something important?

Just a thought, Bluehost.com has SimpleScripts installs for both Revolution and Evolution. and, AFAIK, you can upgrade either one with a few clicks when a new version of MODx is released. The install works great -- a complete MODx install takes a few seconds. I assume that the ugrade would work the same way but have yet to use it.

MODx used to be a bluehost.com affiliate (I can’t find the link), so you can support MODx by going there too.

Unfortunately we have to host all sites on our own servers, since we are a hosting company. We allready support MODx financially (and will continue to do so), so there is no need to move to another host.

I’m still looking for an easy multi-site upgrade path. First I thought that overwriting some files with new ones should be enough. But ofcourse I still need to run the installer to finalize the update. If I could run the installer without the need to click buttons in my browser, I could use wget or something like that. The upgrade path would become:
- replace install folder with new version
- run upgrade script
- upgrade script overwrites current installations with new version
- upgrade script runs installer in "no click/automatic update mode" for all sites
- upgrade script removes install folder
- upgrade scfipt performs additional actions (anybody?)

Any help is appreciated!