WIP

roles/common/defaults/main.yml

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+common_default_packages: []
+common_proxy_server: null

roles/common/tasks/main.yml

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+- name: Setup proxy client
+  when: "common_proxy_server != None"
+  ansible.builtin.include_tasks: "setup_proxy_client.yml"
+
+- name: Setup packages
+  when: "common_default_packages | length > 0"
+  ansible.builtin.include_tasks: "setup_packages.yml"

roles/common/tasks/setup_packages.yml

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+- name: Keep packages up to date
+  ansible.builtin.apt:
+    update_cache: true
+    upgrade: "safe"
+
+- name: Install default packages
+  ansible.builtin.apt:
+    name: "{{ common_default_packages }}"
+    autoclean: true

roles/common/tasks/setup_proxy_client.yml

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+- name: Create 00proxy.conf file
+  ansible.builtin.template:
+    src: "templates/apt_proxy.conf"
+    dest: "/etc/apt/apt.conf.d/00proxy.conf"
+    mode: "644"
+    owner: "root"
+    group: "root"
+
+- name: Add http_proxy and https_proxy variable to file /etc/environment
+  ansible.builtin.lineinfile:
+    path: "/etc/environment"
+    regexp: '^{{ item.key }}='
+    line: '{{ item.key }}="{{ item.value }}"'
+    create: true
+    mode: "644"
+    owner: "root"
+    group: "root"
+  with_items:
+    - key: 'http_proxy'
+      value: '{{ common_proxy_server }}'
+    - key: 'https_proxy'
+      value: '{{ common_proxy_server }}'
+    - key: 'no_proxy'
+      value: 'localhost,127.0.0.0/8,10.0.0.0/8,172.16.0.0/12,192.168.0.0/16'

roles/common/templates/apt_proxy.conf

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+Acquire::http::Proxy "http://{{ common_proxy_server }}";
+Acquire::https::Proxy "https://{{ common_proxy_server }}";