Dockerfile

FROM ubuntu:18.04

# Set shell
SHELL ["/bin/bash", "-o", "pipefail", "-c"]

# Docker
RUN apt-get update && apt-get install -y --no-install-recommends \
        apt-transport-https \
        ca-certificates \
        curl \
        gpg-agent \
        software-properties-common \
    && curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add - \
    && add-apt-repository "deb https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" \
    && apt-get update && apt-get install -y --no-install-recommends \
        docker-ce \
    && rm -rf /var/lib/apt/lists/*

# Build Tools
RUN apt-get update && apt-get install -y --no-install-recommends \
        wget patch vim cpio python unzip rsync bc bzip2 ncurses-dev sudo \
        git make g++ file perl bash binutils locales qemu-utils bison flex \
    && rm -rf /var/lib/apt/lists/*

# Init entry
COPY scripts/entry.sh /usr/sbin/
ENTRYPOINT ["/usr/sbin/entry.sh"]

# Get buildroot
WORKDIR /build