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diff --git a/security/nss/automation/clang-format/Dockerfile b/security/nss/automation/clang-format/Dockerfile
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+# Minimal image with clang-format 3.9.
+FROM ubuntu:18.04
+LABEL maintainer="Martin Thomson <martin.thomson@gmail.com>"
+
+RUN apt-get update \
+ && apt-get install -y --no-install-recommends \
+    ca-certificates \
+    clang-format-10 \
+    locales \
+    python-dev \
+    python-pip \
+    python-setuptools \
+    python-wheel \
+    build-essential \
+ && rm -rf /var/lib/apt/lists/* \
+ && apt-get autoremove -y && apt-get clean -y
+
+RUN pip install mercurial==6.1.1
+
+
+RUN update-alternatives --install /usr/bin/clang-format \
+    clang-format $(which clang-format-10) 10
+
+ENV SHELL /bin/bash
+ENV USER worker
+ENV LOGNAME $USER
+ENV HOME /home/$USER
+ENV HOSTNAME taskcluster-worker
+ENV LANG en_US.UTF-8
+ENV LC_ALL $LANG
+ENV HOST localhost
+ENV DOMSUF localdomain
+
+RUN locale-gen $LANG \
+ && DEBIAN_FRONTEND=noninteractive dpkg-reconfigure locales
+
+RUN useradd -d $HOME -s $SHELL -m $USER
+WORKDIR $HOME
+USER $USER
+
+# Entrypoint - which only works if /home/worker/nss is mounted.
+ENTRYPOINT ["/home/worker/nss/automation/clang-format/run_clang_format.sh"]