Add matrix_docker_installation_enabled

roles/matrix-base/defaults/main.yml

@@ -42,6 +42,10 @@ matrix_docker_network: "matrix"
 # matrix domain (`matrix_server_fqn_matrix`).
 matrix_well_known_matrix_server_enabled: true
 
+# Controls whether docker is automatically installed.
+# If you change this to false you must install and update docker manually.
+matrix_docker_installation_enabled: true
+
 # Variables to Control which parts of our roles run.
 run_postgres_import: true
 run_postgres_upgrade: true

roles/matrix-base/tasks/server_base/setup.yml

@@ -1,5 +1,11 @@
 ---
 
+- name: Gather package facts
+  package_facts:
+
+- set_fact:
+    run_docker_installation: "{{ matrix_docker_installation_enabled|bool and 'docker.io' not in ansible_facts.packages }}"
+
 - include_tasks: "{{ role_path }}/tasks/server_base/setup_centos.yml"
   when: ansible_distribution == 'CentOS'
 

roles/matrix-base/tasks/server_base/setup_centos.yml

@@ -9,11 +9,13 @@
     mode: 0644
   with_items:
     - docker-ce.repo
+  when: run_docker_installation|bool
 
 - name: Ensure Docker's RPM key is trusted
   rpm_key:
     state: present
     key: https://download.docker.com/linux/centos/gpg
+  when: run_docker_installation|bool
 
 - name: Ensure yum packages are installed
   yum:
@@ -31,3 +33,4 @@
       - docker-ce
     state: latest
     update_cache: yes
+  when: run_docker_installation|bool

roles/matrix-base/tasks/server_base/setup_debian.yml

@@ -15,12 +15,14 @@
     state: present
   register: add_repository_key
   ignore_errors: true
+  when: run_docker_installation|bool
 
 - name: Ensure Docker repository is enabled
   apt_repository:
     repo: "deb [arch=amd64] https://download.docker.com/linux/{{ ansible_distribution|lower }} {{ ansible_distribution_release }} stable"
     state: present
     update_cache: yes
+  when: run_docker_installation|bool
 
 - name: Ensure APT packages are installed
   apt:
@@ -38,3 +40,4 @@
       - docker-ce
     state: latest
     update_cache: yes
+  when: run_docker_installation|bool