Dockerfile

FROM ubuntu:20.04

# Prevent interactive questions by tzdata and other packages
ENV DEBIAN_FRONTEND noninteractive

# Install common packages & basic setup
RUN apt-get update \
    && apt-get install --no-install-recommends -y lsof openssl apt-transport-https ca-certificates curl dumb-init locales build-essential vim less nano git jq unzip \
    # Create non-root user
    && groupadd -r coder && useradd -m coder -g coder -s /bin/bash \
    && touch /home/coder/.bash_aliases && chown coder:coder /home/coder/.bash_aliases \
    # set default locale
    && localedef -i en_US -c -f UTF-8 -A /usr/share/locale/locale.alias en_US.UTF-8

ENV LANG en_US.utf8

# Add utility scripts used by Code FREAK
ADD scripts /opt/code-freak

# Install code-server from GitHub
ARG CODE_VERSION="3.9.0"
RUN curl -LsSo /tmp/code-server.deb https://github.com/cdr/code-server/releases/download/v${CODE_VERSION}/code-server_${CODE_VERSION}_amd64.deb \
    && dpkg -i /tmp/code-server.deb \
    && rm /tmp/code-server.deb

# Apply default configuration
COPY --chown=coder:coder settings/ /home/coder/.local/share/code-server/User/

# Python 3.8
RUN apt-get install --no-install-recommends -y python3 python3-pip python-is-python3 \
    && curl -LsSo /tmp/python.vsix https://github.com/microsoft/vscode-python/releases/download/2020.10.332292344/ms-python-release.vsix \
    && chown -R coder:coder /home/coder \
    && su coder -c "pip3 install -U pylint --user" \
    && su coder -c "code-server --install-extension /tmp/python.vsix" \
    && rm /tmp/python.vsix

# C / C++ support with CMake
# code-server downloads the extension for the wrong CPU architecture so we manually download the vsix
# see https://github.com/cdr/code-server/issues/2120
RUN apt-get install --no-install-recommends -y gdb cmake \
    && curl -LsSo /tmp/cpptools-linux.vsix https://github.com/microsoft/vscode-cpptools/releases/download/1.2.1/cpptools-linux.vsix  \
    && su coder -c "code-server --install-extension /tmp/cpptools-linux.vsix" \
    && su coder -c "code-server --install-extension ms-vscode.cmake-tools" \
    && su coder -c "code-server --install-extension twxs.cmake" \
    && rm /tmp/cpptools-linux.vsix

# NodeJS 12.04 via nodesource PPA + npm & yarn
RUN curl -sSL https://deb.nodesource.com/setup_12.x | bash - \
    && curl -sSL https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - \
    && echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list \
    && apt-get install --no-install-recommends -y nodejs yarn \
    && su coder -c "code-server --install-extension dbaeumer.vscode-eslint"

# OpenJDK 11 LTS + Maven
RUN apt-get install --no-install-recommends -y openjdk-11-jdk-headless maven \
    && su coder -c "code-server --install-extension redhat.java" \
    && su coder -c "code-server --install-extension vscjava.vscode-java-debug"

# Install Gradle manually (stolen from official Gradle Docker Image) as the Ubuntu gradle version is from 2012
# https://packages.ubuntu.com/focal/amd64/java/gradle
# https://github.com/docker-library/official-images/blob/master/library/gradle
ENV GRADLE_HOME /opt/gradle
ENV GRADLE_VERSION 6.8.3
ARG GRADLE_DOWNLOAD_SHA256=7faa7198769f872826c8ef4f1450f839ec27f0b4d5d1e51bade63667cbccd205
RUN set -o errexit -o nounset \
    && echo "Downloading Gradle" \
    && curl -LsSo gradle.zip "https://services.gradle.org/distributions/gradle-${GRADLE_VERSION}-bin.zip" \
    && echo "Checking download hash" \
    && echo "${GRADLE_DOWNLOAD_SHA256} *gradle.zip" | sha256sum --check - \
    && echo "Installing Gradle" \
    && unzip gradle.zip \
    && rm gradle.zip \
    && mv "gradle-${GRADLE_VERSION}" "${GRADLE_HOME}/" \
    && ln --symbolic "${GRADLE_HOME}/bin/gradle" /usr/bin/gradle \
    && echo "Testing Gradle installation" \
    && gradle --version

# Mono 6.8.0 + MS .NET Core SDK 3.1
RUN curl -LsSo /tmp/packages-microsoft-prod.deb https://packages.microsoft.com/config/ubuntu/20.04/packages-microsoft-prod.deb \
    && dpkg -i /tmp/packages-microsoft-prod.deb \
    && rm /tmp/packages-microsoft-prod.deb \
    && apt-get update \
    && apt-get install --no-install-recommends -y  mono-complete dotnet-sdk-3.1 \
    && su coder -c "code-server --install-extension ms-dotnettools.csharp" \
    # Pre-install runtime dependecies of C# extension
    && su coder -c "/opt/code-freak/install-ext-runtime-deps.sh /home/coder/.local/share/code-server/extensions/ms-dotnettools.csharp-*" \
    # Install the Samsung .NET Debugger
    && curl -LsSo /tmp/netcoredbg.tar.gz https://github.com/Samsung/netcoredbg/releases/download/1.2.0-738/netcoredbg-linux-focal-amd64.tar.gz \
    && mkdir -p /home/coder/bin \
    && tar -xzf /tmp/netcoredbg.tar.gz -C /home/coder/bin \
    && rm /tmp/netcoredbg.tar.gz

# Run everything as non-root user
USER coder
RUN mkdir -p /home/coder/project
WORKDIR /home/coder/project
CMD dumb-init code-server \
    --disable-telemetry \
    --auth none \
    --port 3000 \
    --host 0.0.0.0 \
    /home/coder/project