exportToFMU function in docker container error

I'm using Docker with mathworks/matlab-deps as a base image and I created the dockerfile following instructions at this site to create my custom dockerfile that installs necessary toolboxes and packages. I installed into the image the FMU_Builder_For_Simulink support package and also MATLAB_Coder, Simulink_Coder, MATLAB_Compiler, Simulink_Compiler and Simulink_Report_Generator.

The dockerfile is here:

FROM mathworks/matlab-deps:${MATLAB_RELEASE}

# Declare build arguments to use at the current build stage.
ARG MATLAB_RELEASE
ARG MATLAB_PRODUCT_LIST
ARG MATLAB_INSTALL_LOCATION
ARG LICENSE_SERVER
ARG INSTALLATION_USER

# Install mpm dependencies.
RUN export DEBIAN_FRONTEND=noninteractive \
    && apt-get update \
    && apt-get install --no-install-recommends --yes \
    gcc g++ \
    wget \
    ca-certificates \
    && apt-get clean \
    && apt-get autoremove \
    && rm -rf /var/lib/apt/lists/*

# Add "matlab" user and grant sudo permission.
RUN adduser --shell /bin/bash --disabled-password --gecos "" ${INSTALLATION_USER} \
    && echo "${INSTALLATION_USER} ALL=(ALL) NOPASSWD: ALL" > /etc/sudoers.d/${INSTALLATION_USER} \
    && chmod 0440 /etc/sudoers.d/${INSTALLATION_USER}

# Set user and work directory.
USER ${INSTALLATION_USER}
WORKDIR /home/${INSTALLATION_USER}

# Run mpm to install MATLAB in the target location and delete the mpm installation afterwards.
# If mpm fails to install successfully, then print the logfile in the terminal, otherwise clean up.
# Pass in $HOME variable to install support packages into the user's HOME folder.
RUN wget -q https://www.mathworks.com/mpm/glnxa64/mpm \
    && chmod +x mpm \
    && sudo HOME=${HOME} ./mpm install \
    --release=${MATLAB_RELEASE} \
    --destination=${MATLAB_INSTALL_LOCATION} \
    --products ${MATLAB_PRODUCT_LIST} \
    || (echo "MPM Installation Failure. See below for more information:" && cat /tmp/mathworks_root.log && false) \
    && sudo rm -rf mpm /tmp/mathworks_root.log \
    && sudo ln -s ${MATLAB_INSTALL_LOCATION}/bin/matlab /usr/local/bin/matlab

# Note: Uncomment one of the following two ways to configure the license server.

# Option 1. Specify the host and port of the machine that serves the network licenses
# if you want to store the license information in an environment variable. This
# is the preferred option. You can either use a build variable, like this:
# --build-arg LICENSE_SERVER=27000@MyServerName or you can specify the license server
# directly using: ENV MLM_LICENSE_FILE=27000@flexlm-server-name
ENV MLM_LICENSE_FILE=$LICENSE_SERVER

# Option 2. Alternatively, you can put a license file into the container.
# Enter the details of the license server in this file and uncomment the following line.
# COPY network.lic ${MATLAB_INSTALL_LOCATION}/licenses/

# The following environment variables allow MathWorks to understand how this MathWorks
# product (MATLAB Dockerfile) is being used. This information helps us make MATLAB even better.
# Your content, and information about the content within your files, is not shared with MathWorks.
# To opt out of this service, delete the environment variables defined in the following line.
# To learn more, see the Help Make MATLAB Even Better section in the accompanying README:
# https://github.com/mathworks-ref-arch/matlab-dockerfile#help-make-matlab-even-better
# ENV MW_DDUX_FORCE_ENABLE=true MW_CONTEXT_TAGS=MATLAB:DOCKERFILE:V1

ENTRYPOINT ["matlab"]
CMD [""]

I built the image. Then I wanted to use the function exportToFMU to build FMU for Linux inside the container, so inside the container in the matlab terminal I ran the command:

exportToFMU('model', 'FMIVersion', '2.0', 'FMUType', 'CS', 'CreateModelAfterGeneratingFMU', 'off');

The output looked like this:

Setting System Target to FMU Co-Simulation for model 'model'.
Setting Hardware Implementation > Device Type to 'MATLAB Host' for model 'model'.
### 'GenerateComments' is disabled for Co-Simulation Standalone FMU Export.
Fontconfig warning: "/usr/share/fontconfig/conf.avail/05-reset-dirs-sample.conf", line 6: unknown element "reset-dirs"
Fontconfig warning: "/usr/share/fontconfig/conf.avail/05-reset-dirs-sample.conf", line 6: unknown element "reset-dirs"

Build Summary

Top model targets built:

Model  Action  Rebuild Reason
=================================================================
model  Failed  Code generation information file does not exist.

0 of 1 models built (0 models already up to date)
Build duration: 0h 0m 25.552s
Error using script
Printing is not supported in -nodisplay mode.

It looks like there is a problem with the exportToFMU function when using -nodisplay mode of matlab. How can I make this work?

Thank you for your help!

Answer 1

[Tao Cheng]

Hi Michal,

The error "Printing is not supported in -nodisplay mode." seems to be related to Simulink's print command: https://www.mathworks.com/help/simulink/ug/print-from-the-matlab-command-line.html

Can you try turning off the icon generation option during FMU Export? Something like "exportToFMU(..., 'AddIcon', 'off')" may help.

HTH,

TC