Use this tag if a question is about Docker Image Patrol (DIP).

Docker Image Patrol (DIP) is a tool that is able to check whether an image:tag already exists in a certain docker-registry. If true, an exit 1 will be returned to prevent that a Continuous Integration (CI) environment will publish and overwrite the tag in a docker-registry. Basically this tool is suitable to implement Tag Immutability (TI) if a docker-registry lacks such a feature.