unixorn/luggage — pull request #25 by henri (2011-12-15 01:26:34+00:00)
Title: Added a feature which allows you to specify that an existing copy of the application will not be overwritten.

Looked into using VolumeCheck and InstallationCheck. However, there were errors with these approaches during testing. It seemed that the install destination volume was not being passed. So instead I decided to place the checks into the preflight script. This means that no message of any value is presented within the GUI install. However, it means that targets other than / are supported.