Fix #7: make python version configurable

Introduced a variable that allows the python version to be configured
Default is python3

Vagrant check are ok ✓

README.md

@@ -39,6 +39,7 @@ The following should be present on the target system
 | matrix_synapse_log_days_keep | 30 |
 | matrix_synapse_deployment_method | pip | Either pip or docker [¹](#footnote_1) |
 | matrix_synapse_supervision_method | systemd | Either systemd, runit or docker [¹](#footnote_1) |
+| matrix_synapse_python_version | 3 | Default python version (2, 3) to be used |
 
 <a name="footnote_1">¹</a>: Docker must be used for both or neither deployment and supervision
 

defaults/main.yml

@@ -13,3 +13,4 @@ matrix_synapse_skip_tls: false
 matrix_synapse_pid_file: "{{ matrix_synapse_base_path }}/synapse.pid"
 matrix_synapse_docker_ports: ["8008:8008", "8448:8448"]
 matrix_synapse_docker_labels: {}
+matrix_synapse_python_version: "3"

tasks/deployment.yml

@@ -30,7 +30,7 @@
           - psycopg2-binary
           - mock
         virtualenv: "{{ matrix_synapse_base_path }}/env"
-        virtualenv_python: python2.7
+        virtualenv_python: "python{{ matrix_synapse_python_version }}"
         extra_args: --upgrade
       tags:
         - pre_install
@@ -49,7 +49,7 @@
       pip:
         name: "{{ matrix_synapse_base_path }}/synapse"
         virtualenv: "{{ matrix_synapse_base_path }}/env"
-        virtualenv_python: python2.7
+        virtualenv_python: "python{{ matrix_synapse_python_version }}"
       when: clone_synapse.changed
       tags:
         - skip_ansible_lint # skip when clause
@@ -59,7 +59,7 @@
 - name: install synapse with docker
   docker_container:
     name: synapse
-    image: "docker.io/matrixdotorg/synapse:{{ matrix_synapse_version }}"
+    image: "docker.io/matrixdotorg/synapse:{{ matrix_synapse_version }}-py{{ matrix_synapse_python_version }}"
     ports: "{{ matrix_synapse_docker_ports }}"
     labels: "{{ matrix_synapse_docker_labels }}"
     restart_policy: unless-stopped