The Problem:

Currently I have an application which uses an entrypoint.sh script as its command, entirely because I need to convert a bunch of ENV vars passed by ConfigMap into a configuration file. I don't think I'm unique in doing this. I'd use ConfigMap to mount the configuration file (a yaml file) directly, except that I need to insert some "dynamic" values at deployment time, such as the Pod IP and the Pod name.

Suggested Solution:

It would be great to implement some method of merging values from the Downward API, or even from other ConfigMaps, into a specially-structured Configmap at deployment time. I don't really know what this would look like; possibly something like the template merge supported by various CMSes like Salt? As a solution, it would allow users to eliminate a whole host of poorly-maintained entrypoint.sh scripts.