auto-detect interpreter

setting ANSIBLE_PYTHON_INTERPRETER to auto will use the value from the
ansible/config/base.yml

debian gets a /usr/bin/python3 for now and need to revisit once we have
ansible 2.10.

Change-Id: I503c1b71c0d01eea668500c0125c752c0584a7ef
Co-Authored-By: Jonathan Rosser <jonathan.rosser@rd.bbc.co.uk>

get-ansible-role-requirements.yml

@@ -136,7 +136,6 @@
             - item['scm'] == "git" or item['scm'] is undefined
 
   vars:
-    ansible_python_interpreter: "/usr/bin/python3"
     homedir: "{{ lookup('env', 'TESTING_HOME') }}"
     role_file: "{{ lookup('env', 'ANSIBLE_ROLE_REQUIREMENTS_PATH') }}"
     osa_roles: "{{ lookup('file', role_file) | from_yaml }}"

test-ansible-functional.sh

@@ -29,6 +29,15 @@
 set -e
 
 ## Vars ----------------------------------------------------------------------
+# Source distribution information
+source /etc/os-release || source /usr/lib/os-release
+
+#TODO: cleanup on ansible 2.10 if debian is in config/base.yml
+if [ "${ID}" == "debian" ] && [ "${VERSION_ID}" == "10" ]; then
+  ANSIBLE_PYTHON_INTERPRETER="/usr/bin/python3"
+fi
+
+export ANSIBLE_PYTHON_INTERPRETER=${ANSIBLE_PYTHON_INTERPRETER:-auto}
 
 export TESTING_HOME=${TESTING_HOME:-$HOME}
 export WORKING_DIR=${WORKING_DIR:-$(pwd)}
@@ -48,6 +57,7 @@ echo "ANSIBLE_PARAMETERS: ${ANSIBLE_PARAMETERS}"
 echo "TEST_PLAYBOOK: ${TEST_PLAYBOOK}"
 echo "TEST_CHECK_MODE: ${TEST_CHECK_MODE}"
 echo "TEST_IDEMPOTENCE: ${TEST_IDEMPOTENCE}"
+echo "ANSIBLE_PYTHON_INTERPRETER: ${ANSIBLE_PYTHON_INTERPRETER}"
 
 ## Functions -----------------------------------------------------------------
 

test-install-horizon.yml

@@ -29,8 +29,6 @@
   become: no
   gather_facts: false
   any_errors_fatal: true
-  vars:
-    ansible_python_interpreter: "{{ ansible_playbook_python }}"
   vars_files:
     - test-vars.yml
   tasks:

tests/host_vars/localhost.yml

@@ -21,4 +21,3 @@ bridges:
     ip_addr: "10.1.2.1"
     veth_peer: "veth-test"
 
-ansible_python_interpreter: "/usr/bin/python"