# Adding this stage is a workaround because `COPY --from` does not support
# variable substitution.
# See https://github.com/moby/moby/issues/34482
ARG EMACS_VERSION=25.3
FROM flycheck/emacs-cask:${EMACS_VERSION} AS emacs-cask

FROM flycheck/all-tools

# We need gnutls for downloading packages from ELPA
RUN apt-get -qq update && \
    apt-get install -qq --no-install-recommends -y \
            gnutls-bin \
            make \
    && rm -rf /var/lib/apt/lists/*

# We need Emacs and Cask
ENV PATH /opt/emacs/bin:$PATH
COPY --from=emacs-cask /opt/emacs /opt/emacs

ENV PATH /root/.cask/bin:$PATH
COPY --from=emacs-cask /root/.cask /root/.cask
COPY --from=emacs-cask /root/.emacs.d /root/.emacs.d