[Libguestfs] [PATCH 0/4] Add customization capabilities to virt-sysprep

In the TODO file there's a discussion of perhaps writing a new 'virt-customize' tool. I think it's probably better (or at any rate, easier) to just add this functionality into virt-sysprep. That is what this small series of patches aims to achieve. Note these are not very well tested at the moment. The first patch adds a generic and useful '--firstboot' flag. The intended use is to add programs/scripts that run at first boot, for example: virt-sysprep -d some_guest \ --firstboot ./yum-update.sh \ --firstboot ./add-users.sh This is implemented by installing a systemd or sysvinit service into the guest which runs the scripts when the guest boots, deleting them after they have run. [Dan: Is the systemd unit correct?] Patches 2/4 and 3/4 implement another customization: setting the login screen background image. When I actually started investigating how to do this, I realized it is fearsomely complicated because basically every guest type has its own method to do this, and they even change frequently between versions (eg. gconf -> dconf, GNOME vs KDE etc). Since the --firstboot parameter effectively gives this capability to system administrators (albeit they need to work out how to do it themselves), I think it may be a good idea to invest the time making sure --firstboot is bullet-proof, and *not* implement specific customizations like this. What do people think? Patch 4/4 updates the man page to reflect the new capabilities of virt-sysprep. Comments welcome. Rich.