Feature request: docker build --verbose

Archive Feature Requests
1

We have the following step in one of our dockerfiles:

RUN mkdir -p ${BUILD_DIR} \
    && cd ${BUILD_DIR} \
    && cmake \
        -DUSE_FEATURE_FOO=${USE_FEATURE_FOO} \
        -DUSE_FEATURE_BAR=${USE_FEATURE_BAR} \
        -DUSE_FEATURE_BAZ=${USE_FEATURE_BAZ} \
        /src \
    && make --jobs ${MAKE_JOBS} ${BUILD_TARGET}

When we run docker build, the following is output:

RUN mkdir -p /src/.build/release     && cd /src/.build/release...

The flags which were enabled in this build are not printed.

It would be really useful to be able to enable verbose output, and have the entire RUN command printed out.