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+# This Docker build emulates roughly what Travis CI is doing. It is not exactly
+# the same (different tool versions) and success in this image may not
+# necessarily mean success on Travis. This image is also not automatically
+# tested, so it may get out of date. Send PRs if you use it and it's broken.
+#
+# For one, we use bionic, not xenial, because xenial's clang is way too old.
+FROM ubuntu:16.04
+
+# Travis environment.
+RUN apt-get update && apt-get install --no-install-recommends -y \
+ apt-transport-https \
+ build-essential \
+ ca-certificates \
+ curl \
+ git \
+ pkg-config \
+ python-pip \
+ python-setuptools \
+ python3 \
+ software-properties-common \
+ wget \
+ && apt-get clean \
+ && rm -rf /var/lib/apt/lists/*
+
+RUN curl https://apt.llvm.org/llvm-snapshot.gpg.key | apt-key add - \
+ && apt-add-repository "deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-6.0 main" \
+ && apt-get update && apt-get install --no-install-recommends -y \
+ clang-6.0 \
+ clang-format-6.0 \
+ llvm-6.0 \
+ && apt-get clean \
+ && rm -rf /var/lib/apt/lists/*
+
+RUN ls /usr/bin/clang-6.0 && ln -s /usr/bin/clang-6.0 /usr/bin/clang \
+ && ls /usr/bin/clang++-6.0 && ln -s /usr/bin/clang++-6.0 /usr/bin/clang++ \
+ && ls /usr/bin/clang-format-6.0 && ln -s /usr/bin/clang-format-6.0 /usr/bin/clang-format \
+ && ls /usr/bin/opt-6.0 && ln -s /usr/bin/opt-6.0 /usr/bin/opt
+
+# Bionic's cmake is too old.
+RUN pip install --upgrade pip cmake
+
+# .travis.yml
+RUN apt-get update && apt-get install --no-install-recommends -y \
+ libconfig-dev \
+ libgtest-dev \
+ libopus-dev \
+ libsodium-dev \
+ libvpx-dev \
+ ninja-build \
+ pylint3 \
+ && apt-get clean \
+ && rm -rf /var/lib/apt/lists/*
+
+# Set up travis user.
+RUN groupadd -r -g 1000 travis \
+ && useradd --no-log-init -r -g travis -u 1000 travis \
+ && mkdir -p /src/workspace /home/travis \
+ && chown travis:travis /home/travis
+USER travis
+
+# Set up environment.
+ENV CC=gcc CXX=g++ \
+PATH=/home/travis/.local/bin:$PATH \
+TRAVIS_REPO_SLUG=TokTok/c-toxcore
+
+# Copy minimal files to run "cmake-linux install", so we can avoid rebuilding
+# astyle and other things when only source files change.
+RUN mkdir -p /home/travis/build/c-toxcore /home/travis/cache
+WORKDIR /home/travis/build/c-toxcore
+COPY --chown=travis:travis c-toxcore/.travis/ /home/travis/build/c-toxcore/.travis/
+RUN .travis/cmake-linux install
+
+# Now copy the rest of the sources and run the build.
+COPY --chown=travis:travis . /home/travis/build/
+RUN .travis/cmake-linux script