FROM ubuntu:20.10
RUN apt-get update && apt-get install -y sudo curl xz-utils && apt-get clean

RUN useradd builder -d /home/builder && mkdir /home/builder && chown builder /home/builder
RUN echo "builder ALL=(root) NOPASSWD:ALL" > /etc/sudoers.d/user && \
    chmod 0440 /etc/sudoers.d/user

USER builder
ENV USER builder

RUN curl -L https://nixos.org/nix/install | sh
RUN echo '. /home/builder/.nix-profile/etc/profile.d/nix.sh' >> /home/builder/.bashrc
ENV PATH "/home/builder/.nix-profile/bin/:$PATH"