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openSUSE:YaST: Modifying the Installer

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For completely updated information, please refer to the documentation section of the YaST development landing page.

Installation — Frameworks and Installation Process covers:

the product control file which allows to customize many areas of the initial installation (source)
the optional first boot module and its configuration (source)
pre-selecting add-on products (source)
the API for modules taking part in the installation proposal (source)

YaST