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27 lines
1.1 KiB
Docker
27 lines
1.1 KiB
Docker
# We're using a multistage Docker build here in order to allow us to release a self-verifying
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# Docker image when built on the official Docker infrastructure.
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# They require us to verify the source integrity in some way while making sure that this is a
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# reproducible build.
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# See https://github.com/docker-library/official-images#image-build
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# In order to achieve this, we externally host the rootfs archives and their checksums and then
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# just download and verify it in the first stage of this Dockerfile.
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# The second stage is for actually configuring the system a little bit.
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# Some templating is done in order to allow us to easily build different configurations and to
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# allow us to automate the releaes process.
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FROM alpine:3.12 AS verify
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COPY TEMPLATE_ROOTFS_FILE /
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RUN apk add --no-cache curl bash
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SHELL ["/bin/bash", "-c"]
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RUN ROOTFS="$(curl -sOJL --continue-at - -w "%{filename_effective}" TEMPLATE_ROOTFS_URL)" && \
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sha256sum -c <<< "TEMPLATE_ROOTFS_HASH" && \
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mkdir /rootfs && \
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tar -C /rootfs --extract --file "${ROOTFS}"
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FROM scratch AS root
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COPY --from=verify /rootfs/ /
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RUN ldconfig
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ENV LANG=en_US.UTF-8
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CMD ["/usr/bin/bash"]
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