Avinash Sridharan created MESOS-5277:
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             Summary: Need to add REMOVE semantics to the copy backend
                 Key: MESOS-5277
                 URL: https://issues.apache.org/jira/browse/MESOS-5277
             Project: Mesos
          Issue Type: Bug
          Components: containerization
         Environment: linux
            Reporter: Avinash Sridharan
            Assignee: Gilbert Song


Some Dockerfile run the `rm` command to remove files from the base image using 
the "RUN" directive in the Dockerfile. An example can be found here:
https://github.com/ngineered/nginx-php-fpm.git

In the final rootfs the removed files should not be present. Presence of these 
files in the final image can make the container misbehave. For example, the 
nginx-php-fpm docker image that is reference tries to remove the default nginx 
config and replace it with it own config to point a different HTML root. If the 
default nginx config is still present after the building the image, nginx will 
start pointing to a different HTML root than the one set in the Dockerfile.


Currently the copy backend cannot handle removal of files from intermediate 
layers. This can cause issues with docker images built using a Dockerfile 
similar to the one listed here. Hence, we need to add REMOVE semantics to the 
copy backend.  



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