makerpmdelta.sh script
--- cut ---
rpm2cpio <$FILE1 >$FILE1.cpio
rpm2cpio <$FILE2 >$FILE2.cpio
--- cut ---
This way you loose pre/post install/uninstall scripts AFAIK. Also what
about signed packages? I don't say that not having xdelta/patch like tool
for rpms is a good thing, but it looks like it's not that easy...
Read the whole script, or try it! It is a working demo, and the delta
files produced are of about the size you would get for a properly
implemented rpm delta. It just isn't user friendly.
Michael Young