Everytime I run buildout to add a product egg, it deletes all the stuff under parts.
How do people deal with this?
Update: To only register a new egg to the instance, you can use buildout's install-command to only build specific parts like this:
buildout install instance
"Why does buildout delete my instance/etc and Extensions folder each time it is run?"
-> Because that's what buildout is made for: To build automatically the parts, the way it is defined in the buildout-configuration-file. Not deleting former dirs and files would easily result in conflicts and errors, I guess. Can anyone confirm?
"How do people deal with this?"
-> By not putting anything in the parts directory at all ;) No seriously, it is not recommended to do it.
What's your specific use-case?