Be able to customize the public ip resolver script

[grozeille]

I'm using Rancher to deploy the docker images.
It comes with an internal DNS server, so I'm not using Consul.io and I'm disabling it with the correct env variable.

I wish to customize the public-hostname.sh script using the metadata service provided by Rancher:
http://rancher.com/docs/rancher/v1.6/en/rancher-services/metadata-service/

curl http://rancher-metadata/latest/self/host/hostname

What is the best option ?

• Inherits from the official image and add my custom script ?
• Patch the current script to support multiple metadata services (consul & rancher) and use an ENV variable to choose the right one ?
• Pass the command to execute as an ENV variable ?