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support/docker: limit the number of layers

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The official documentation [0] suggests limiting the number of layers
generated from a dockerfile. A layer is created for each RUN (and COPY
and ADD) command. But we are only ever interested in the final image,
so the intermediate layers are useless to us.

Limit the number of RUN commands to limit the number of generated
layers.

[0] https://docs.docker.com/develop/develop-images/dockerfile_best-practices/#minimize-the-number-of-layers

Reported-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Peter Korsgaard <peter@korsgaard.com>
Cc: Arnout Vandecappelle <arnout@mind.be>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Yann E. MORIN 2018-02-04 15:44:22 +01:00 committed by Peter Korsgaard
parent 9c267b4967
commit 7517aef4dc
1 changed files with 15 additions and 15 deletions
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support/docker/Dockerfile
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@ -11,25 +11,25 @@ description="Container with everything needed to run Buildroot"
# Setup environment
ENV DEBIAN_FRONTEND noninteractive
RUN dpkg --add-architecture i386
# The container has no package lists, so need to update first
RUN apt-get update -y -qq
RUN apt-get install -y -qq --no-install-recommends \
RUN dpkg --add-architecture i386 && \
apt-get update -y -qq && \
apt-get install -y -qq --no-install-recommends \
build-essential cmake libc6:i386 gcc-multilib \
bc ca-certificates file locales rsync \
cvs bzr git mercurial subversion wget \
cpio unzip \
libncurses5-dev \
python-nose2 python-pexpect qemu-system-arm qemu-system-x86
RUN apt-get -q -y autoremove
RUN apt-get -q -y clean
python-nose2 python-pexpect qemu-system-arm qemu-system-x86 && \
apt-get -q -y autoremove && \
apt-get -q -y clean
# To be able to generate a toolchain with locales, enable one UTF-8 locale
RUN sed -i 's/# \(en_US.UTF-8\)/\1/' /etc/locale.gen
RUN /usr/sbin/locale-gen
RUN sed -i 's/# \(en_US.UTF-8\)/\1/' /etc/locale.gen && \
/usr/sbin/locale-gen
RUN useradd -ms /bin/bash br-user
RUN chown -R br-user:br-user /home/br-user
RUN useradd -ms /bin/bash br-user && \
chown -R br-user:br-user /home/br-user
USER br-user
WORKDIR /home/br-user