Allow the start command of the Docker service to be overwritten.

README.md

@@ -54,6 +54,7 @@ A list of packages to be uninstalled prior to running this role. See [Docker's i
 docker_service_manage: true
 docker_service_state: started
 docker_service_enabled: true
+docker_service_start_command: ""
 docker_restart_handler_state: restarted
 ```
 

defaults/main.yml

@@ -23,6 +23,7 @@ docker_obsolete_packages:
 docker_service_manage: true
 docker_service_state: started
 docker_service_enabled: true
+docker_service_start_command: ""
 docker_restart_handler_state: restarted
 
 # Docker Compose Plugin options.

tasks/main.yml

@@ -68,6 +68,25 @@
   when: docker_daemon_options.keys() | length > 0
   notify: restart docker
 
+- name: Replace Docker service ExecStart command.
+  when: docker_service_start_command != ""
+  notify: restart docker
+  block:
+    - name: Get Docker service status
+      ansible.builtin.systemd_service:
+        name: docker
+      register: docker_service_status
+    - name: Patch docker.service
+      ansible.builtin.replace:
+        path: "{{ docker_service_status.status['FragmentPath'] }}"
+        regexp: "^ExecStart=.*$"
+        replace: "ExecStart={{ docker_service_start_command }}"
+      register: docker_service_patch
+    - name: Reload systemd services
+      service:
+        daemon_reload: true
+      when: docker_service_patch.changed
+
 - name: Ensure Docker is started and enabled at boot.
   service:
     name: docker