AutoYaST Rules
The AutoYaST rules allow configuring the system according to several system attributes.
See more details in the AutoYaST rules documentation.
X Window or Minimal System
OS: openSUSE Leap 15
Files: rules/rules.xml,
mini_leap15.xml,
x11.xml
Boot option: autoyast=https://lslezak.github.io/rules1/
Note: 
The trailing slash (“/”) is important!
- Depending on the disk size it either installs the X Window System (>1GB) or a minimal system with text mode (<1GB).