Finally idempotence sorted out

Author: UnderGreen

tasks/install.debian.yml

@@ -97,6 +97,36 @@
   notify:
     - reload systemd
 
+- name: Forcefully set mongodb_pymongo_from_pip to true on Debian 10
+  set_fact:
+    mongodb_pymongo_from_pip: false
+  when:
+    - ansible_distribution == 'Debian'
+    - ansible_distribution_release == 'buster'
+
 - name: Install PyMongo package
   apt:
     name: "{{ 'python-pymongo' if ansible_facts['python'].version.major == 2 else 'python3-pymongo' }}"
+  when: not mongodb_pymongo_from_pip
+
+- name: Install PIP
+  apt:
+    pkg:
+      - python-dev
+      - python-pip
+  when: mongodb_pymongo_from_pip | bool
+
+  # TODO: check if it is still needed for Debian/Ubuntu
+- name: Install setuptools (required for ansible 2.7+)
+  apt:
+    pkg:
+      - python-setuptools
+  when: mongodb_pymongo_from_pip | bool
+
+- name: Install PyMongo from PIP
+  pip:
+    name:
+      - pymongo
+    state: "{{ mongodb_pymongo_pip_version is defined | ternary('present', 'latest') }}"
+    version: "{{ mongodb_pymongo_pip_version | default(omit) }}"
+  when: mongodb_pymongo_from_pip | bool