fix: safely remove legacy docker.list on Debian without unsupported args/filters

tasks/setup-Debian.yml

@@ -21,25 +21,18 @@
       ansible.builtin.stat:
         path: "/etc/apt/sources.list.d/docker.list"
       register: legacy_docker_list
+    - name: Check whether legacy docker.list references the official Docker repo
+      ansible.builtin.command:
+        cmd: grep -q "{{ docker_repo_url }}" /etc/apt/sources.list.d/docker.list
+      register: legacy_grep
+      ignore_errors: true
+      changed_when: false
 
     - name: Remove legacy docker.list if it does not reference the official Docker repo
-      ansible.builtin.shell: |
+      ansible.builtin.file:
-        legacy_path="/etc/apt/sources.list.d/docker.list"
+        path: "/etc/apt/sources.list.d/docker.list"
-        if [ -f "$legacy_path" ]; then
+        state: absent
-          if grep -q "{{ docker_repo_url }}" "$legacy_path"; then
+      when: legacy_docker_list.stat.exists and legacy_grep.rc != 0
-            # file points to official repo; leave it
-            exit 0
-          else
-            rm -f "$legacy_path"
-            exit 0
-          fi
-        fi
-      when: legacy_docker_list.stat.exists
-      changed_when: "'removed' in ansible_facts.get('cmd', {}) or (legacy_docker_list.stat.exists and (lookup('file', '/etc/apt/sources.list.d/docker.list') | default('') | search(docker_repo_url) == False))"
-      args:
-        warn: false
-      register: remove_legacy_result
-      failed_when: false
 
 - name: Ensure dependencies are installed.
   ansible.builtin.apt: