{% macro install_debian_packages(packages) -%}
RUN dpkg_apt() { [ -f $1 ] && { dpkg -i $1 || apt-get -y install -f; } || return 1; }; \
    {%- for deb in packages %}
        dpkg_apt /debs/{{ deb }} {%- if not loop.last %} && \ {%- endif %}
    {%- endfor %}
{%- endmacro %}

{% macro install_python2_wheels(packages) -%}
RUN cd /python-wheels/ && pip2 install {{ packages | join(' ') }}
{%- endmacro %}

{% macro install_python3_wheels(packages) -%}
RUN cd /python-wheels/ && pip3 install {{ packages | join(' ') }}
{%- endmacro %}

{% macro install_python_wheels(packages) -%}
{%- set py2_pkgs, py3_pkgs = [], [] %}
{%- for pkg in packages %}
    {%- if 'py3' in pkg %}
       {{- py3_pkgs.append(pkg) or '' }}
    {%- else %}
       {{- py2_pkgs.append(pkg) or '' }}
    {%- endif %}
{%- endfor %}
{%- if py3_pkgs | length %}
{{ install_python3_wheels(py3_pkgs) }}
{%- endif %}
{%- if py2_pkgs | length %}
{{  install_python2_wheels(py2_pkgs) }}
{%- endif %}
{%- endmacro %}

{% macro copy_files(prefix, files, dest) -%}
COPY \
    {%- for file in files %}
        {{ prefix }}/{{ file }} \
    {%- endfor %}
    {{ dest }}
{%- endmacro %}