redstonewizard/ubuntu repository overview

FROM alpine as builder

# Arguments
ARG UBUNTU_BUILD=current
ARG UBUNTU_DISTRO=impish

# Install packages
RUN apk update && apk upgrade && apk add curl tar bash

# Use bash
ENV SHELL=/bin/bash
SHELL [ "/bin/bash", "-c" ]

# Download Ubuntu
WORKDIR /
RUN export UNAME_ARCH=$(uname -m) && \
    case ${UNAME_ARCH} in \
        aarch64) export ARCH=arm64 ;; \
        armv7l) export ARCH=armhf ;; \
        x86_64) export ARCH=amd64 ;; \
        ppc64le) export ARCH=ppc64el ;; \
        s390x) export ARCH=s390x ;; \
        *) echo "Unknown architecture: ${UNAME_ARCH}" && exit 1 ;; \
    esac && \
    curl -fsSLo /rootfs.tar.gz \
    https://partner-images.canonical.com/core/${UBUNTU_DISTRO}/${UBUNTU_BUILD}/ubuntu-impish-core-cloudimg-${ARCH}-root.tar.gz

# Extract Ubuntu
WORKDIR /
RUN mkdir /rootfs && \
    tar -zxf /rootfs.tar.gz -C /rootfs

# Add files
FROM scratch

# Copy files
COPY --from=builder /rootfs /

# Set startup
CMD [ "/bin/bash" ]