Dockerfile.pi.aarch64

# docker buildx build --platform linux/arm64 .
FROM --platform=linux/arm64 alpine AS bootstrap
ARG PLATFORM="rpi-aarch64"
ARG MIRROR_URL="http://mirror.archlinuxarm.org"
RUN set -euo pipefail \
    && tarball="ArchLinuxARM-${PLATFORM}-latest.tar.gz" \
    && checksum_line="$(set -euo pipefail \
            && wget -qO- "${MIRROR_URL}/os/${tarball}.md5" \
                | grep "\s$(echo "${tarball}" | sed 's/\./\\\./g')\$" \
        )" \
    && wget "${MIRROR_URL}/os/${tarball}" \
    && echo "${checksum_line}" | md5sum -c \
    && mkdir /rootfs \
    && tar \
        --extract -z -f "${tarball}" \
        --strip-components=1 --numeric-owner \
        -C /rootfs \
    && rm -f "${tarball}" /rootfs/README \
    && echo "Server = ${MIRROR_URL}/\$arch/\$repo" \
        > /rootfs/etc/pacman.d/mirrorlist

FROM --platform=linux/arm64 scratch AS base
ARG LOCALE_LANG="en_US.UTF-8"
COPY --from=bootstrap /rootfs/ /
RUN set -euo pipefail \
    && pacman-key --init \
    && pacman-key --populate archlinuxarm \
    && pacman -Syu --noconfirm archlinux-keyring \
    && pacman -Su --noconfirm --needed base \
    && sed "s/^#\(${LOCALE_LANG}\( \|$\)\)/\1/" -i /etc/locale.gen \
    && locale-gen \
    && echo "LANG=${LOCALE_LANG}" > /etc/locale.conf \
    && setcap cap_net_raw+ep /usr/bin/ping \
    && pacman -Sc --noconfirm
CMD ["/bin/bash"]