I'm writing some shell scripts to help my web container find other containers it depends on. I'm doing this by first storing the cidfile when e.g. the db container starts then later when the web container starts it looks up the IP address using the cidfile.

My issue is that whenever a docker command fails e.g. when the container id isnt valid for an inspect command, docker doesn't set an error code. It would be helpful if docker commands set an error code when they fail.