On your database server, start SQL Server Management Studio
Connect to your database server
Find the database you want to work with and expand in the tree view
Click to expand the 'Database Diagrams' folder
When prompted to create missing supporting objects
Perform the generateChangeLog operation
Generated changelog should not contain info on system tables.
the 'sysdiagrams' table is pulled with everything else. This table doesn't impact the application I am working to support so I don't really need the information about it.
Sample output below:
SQL Server 2008 r2 on Windows Server 2012
Liquibase Client Platform: Windows 7 and Ubuntu 12.10