Table 3 RPM handling of configuration files

old in   old on     new in   new on 
package  filesystem package  filesystem approach
======== ========== ======== ========== ===========================================
X        X          X        X          keep old config
X        X'         X'       X'         keep old config
X        X'         X        X'         keep old config
X        X          Y        Y          install new config
X        X'         Y        Y          install new config, preserve X' as .rpmsave
-        X          Y        Y          install new config, preserve X  as .rpmorig