Merge pull request #985 from mkllnk/python

Re-introduce python installation

playbooks/setup.yml

@@ -5,6 +5,23 @@
 # Use: `ansible-playbook playbooks/setup.yml -e "ansible_user=ubuntu" --limit <server_tag>` if
 # provisioning an EC2 instance for the first time (this only needs to be run once).
 
+# Ensure python is set up and accessible on the server before starting.
+- name: python check
+  hosts: ofn_servers
+  gather_facts: no
+  remote_user: root
+  tasks:
+    - name: Install python
+      become: yes
+      raw: |
+        test -e /usr/bin/python || (
+          apt-get update -qq &&\
+          apt-get install -q --yes python3 &&\
+          ln -s /usr/bin/python3 /usr/bin/python
+        )
+      register: python_install
+      changed_when: python_install.stdout == ""
+
 # Add the default user and ssh keys as root
 - name: set up default_user
   hosts: ofn_servers