Allow to use environment variables in COPY --from

Docker composes has the notion of project name (a prefix for the services). It may be set with env. var. $COMPOSE_PROJECT_NAME. It would be good if we can use it with COPY --from inside Dockerfiles: ``` FROM ubuntu:xenial COPY --from=${COMPOSE_PROJECT_NAME}_container /opt /opt ``` It gives error: ``` ERROR: Service '...' failed to build: invalid from flag value ${COMPOSE_PROJECT_NAME}_container: invalid reference format: repository name must be lowercase ```

Posted by asfernandes on Aug 11, 2017, 2:52 AM

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• github (Other)

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