Hi! Let me tell you what are we doing in order to upgrade the XOs at this latitudes... Currently, we are working at one school with 135 XOs and one school server.
Each XO has a script written in bash which is called by crontab a few times a day. This sript (the "actualizator", as we named it) checks if the XO is connected to the school server. If it is connected, it downloads a list of the updates avaiable in the server (using wget). Checks which upgrades haven´t been installed and downloads them. The upgrade is a *.tar.gz which contains a sript called "install" which is called by the actualizator after "untaring?" the *.tar.gz and the files used for the upgrade (they could be sripts, rpm or whatever). The install script executes commands in order to install those files. When it finishes, the upgrade version is refreshed and continues with the next one if any. The upgrade version is the date in format YYYMMDD, so newer updates have a higher version number. The XO also uploads its mac address and version number to the server so we can check how many XOs have been updated. We are fixing some bugs yet, but it seems to be working fine.
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