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Fixed docker image for non-amd64 platforms

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PR#489 (01430603b689bdb213acd7cf6eaa712173dea59f) introduced dumb-init for better
signals handling.
While this has the intended effect, it was done ny downloading the dumb-init static bin
into the image… only using the amd64 version.

Ever since, the image(s) have been broken for armv7 and arm64.

As dumb-init doesn't provide 32b arm binary and because it's such a simple/small code,
this fix compiles it in a builder shallow image ; ensuring we're getting an appropriate
binary for the target arch.

We are also statically linking against musl-C as this is supported by dumb-init and is
much smaller than glibc.
This commit is contained in:
renaud gaudin 2021-12-21 10:09:47 +00:00
parent c0fa06c931
commit dedcae83cd
1 changed files with 19 additions and 10 deletions
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29
docker/Dockerfile
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@ -1,3 +1,14 @@
# dumb-init to use as entrypoint so it can forward signals to our CMD
FROM debian:bullseye-slim as builder
RUN apt-get update -y \
&& apt-get install -y --no-install-recommends \
build-essential musl-tools wget unzip make \
&& apt-get clean \
&& rm -rf /var/lib/apt/lists/*
# compile dumb-init
RUN wget -nv https://github.com/Yelp/dumb-init/archive/refs/tags/v1.2.5.zip && \
unzip v1.2.5.zip && cd dumb-init-1.2.5 && CC=musl-gcc make
# declare build option ARCH if not using buildx
ARG ARCH=
# declare version to build image for
@ -12,20 +23,18 @@ ARG TARGETARCH
ARG VERSION
ARG ARCH
# defaulting to amd64
RUN echo "amd64" > /etc/docker_arch
# use --build-arg ARCH if it was provided (not using buildx)
RUN if [ ! -z "$ARCH" ] ; then echo "$ARCH" > /etc/docker_arch ; fi
# use $TARGETARCH if provided.
RUN if [ ! -z "$TARGETARCH" ] ; then echo "$TARGETARCH" > /etc/docker_arch ; fi
# copy built dumb-init
COPY --from=builder /dumb-init-1.2.5/dumb-init /usr/bin/dumb-init
# find and store arch in image, using (in this order):
# $TARGETARCH || --build-arg ARCH (not using buildx) || amd64
RUN echo "amd64" > /etc/docker_arch && \
if [ ! -z "$ARCH" ] ; then echo "$ARCH" > /etc/docker_arch ; fi && \
if [ ! -z "$TARGETARCH" ] ; then echo "$TARGETARCH" > /etc/docker_arch ; fi
# decide which kiwix arch to download later (`armhf` for all arm* and x86_64 otherwise)
RUN if [ $(cut -c 1-3 /etc/docker_arch) = "arm" ] ; then echo "armhf" > /etc/kiwix_arch ; else echo "x86_64" > /etc/kiwix_arch ; fi
# dumb-init to use as entrypoint so it can forward signals to our CMD
RUN wget -q -O /usr/bin/dumb-init https://github.com/Yelp/dumb-init/releases/download/v1.2.5/dumb-init_1.2.5_x86_64 && \
chmod +x /usr/bin/dumb-init
# Install kiwix-tools
RUN url="http://mirror.download.kiwix.org/release/kiwix-tools/kiwix-tools_linux-$(cat /etc/kiwix_arch)-$VERSION.tar.gz" && \
echo "URL: $url" && \