linux-formula/linux/files/apt.conf.d_proxies

{%- if ftp and ftp.lower() != 'none' %}
Acquire::ftp::proxy{%- if external_host %}::{{ external_host }}{% endif %} "{{ ftp }}";
{%- endif %}
{%- if http and http.lower() != 'none' %}
Acquire::http::proxy{%- if external_host %}::{{ external_host }}{% endif %} "{{ http }}";
{%- endif %}
{%- if https and https.lower() != 'none' %}
Acquire::https::proxy{%- if external_host %}::{{ external_host }}{% endif %} "{{ https }}";
{%- endif -%}