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ARG S6_OVERLAY_VERSION = "3.0.0.2"
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ARG S6_OVERLAY_RELEASE = "https://github.com/just-containers/s6-overlay/releases/download/"
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# First stage - Download s6-overlay noarch base and unpack it
FROM scratch AS downloader-s6-base
ARG S6_OVERLAY_VERSION
ARG S6_OVERLAY_RELEASE
ADD " ${ S6_OVERLAY_RELEASE } /v ${ S6_OVERLAY_VERSION } /s6-overlay-noarch- ${ S6_OVERLAY_VERSION } .tar.xz " /s6overlay-base.tar.xz
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# Second stage - Download s6-overlay platform-dependent binaries and unpack
FROM --platform=${TARGETPLATFORM} alpine:3.15 AS downloader-s6-bin
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ARG TARGETPLATFORM
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ARG S6_OVERLAY_VERSION
ARG S6_OVERLAY_RELEASE
ARG S6_OVERLAY_RELEASE_URL = " ${ S6_OVERLAY_RELEASE } /v ${ S6_OVERLAY_VERSION } /s6-overlay- ${ TARGETPLATFORM } - ${ S6_OVERLAY_VERSION } .tar.xz "
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RUN wget -O /s6overlay-bin.tar.xz " $( echo ${ S6_OVERLAY_RELEASE_URL } | sed 's/linux\///g' | sed 's/amd64/x86_64/g' | sed 's/arm64/aarch64/g' | sed 's/arm\/v7/armhf/g' ) "
# Third stage - Build rootfs from s6 parts
FROM alpine:3.15 AS rootfs-builder
COPY --from= downloader-s6-base [ "/s6overlay-base.tar.xz" , "/s6overlay-base.tar.xz" ]
COPY --from= downloader-s6-bin [ "/s6overlay-bin.tar.xz" , "/s6overlay-bin.tar.xz" ]
WORKDIR "/rootfs-build/"
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RUN apk add --no-cache tar xz \
&& tar -Jxpf /s6overlay-base.tar.xz -C /rootfs-build \
&& tar -Jxpf /s6overlay-bin.tar.xz -C /rootfs-build
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# Final stage
FROM scratch AS s6-rootfs
LABEL maintainer = "Aleksandar Puharic <aleksandar@puharic.com>"
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COPY --from= rootfs-builder [ "/rootfs-build/" , "/" ]