Remove support for Python 2 on the host

Drops support for creating Python 2 virtualenvs in bootstrap-servers,
and looking for a python2 interpreter in the kolla-ansible script.

Also forces the use of Python 3 as the remote interpreter in CI on
Debian and Ubuntu hosts, since they typically symlink the unversioned
interpreter to python2.7.

Change-Id: Id0e977de381e7faafed738674a140ba36184727e
Partially-Implements: blueprint drop-py2-support

1 files changed, 4 insertions, 13 deletions

diff --git a/tools/kolla-ansible b/tools/kolla-ansible
index 4322c9cb0..1afc41757 100755
--- a/tools/kolla-ansible
+++ b/tools/kolla-ansible
@@ -15,10 +15,7 @@ function check_ansible_compatibility {
 }
 
 function find_base_dir {
-    # $1: Python interpreter
-    local python
-    python=$1
-    local real_path=$($python -c "import os;print(os.path.realpath('$0'))")
+    local real_path=$(python3 -c "import os;print(os.path.realpath('$0'))")
     local dir_name="$(dirname "$real_path")"
     if [ -z "$SNAP" ]; then
         if [[ ${dir_name} == "/usr/bin" ]]; then
@@ -142,21 +139,15 @@ LONG_OPTS="help,inventory:,playbook:,skip-tags:,tags:,key:,extra:,verbose,config
 RAW_ARGS="$*"
 ARGS=$(getopt -o "${SHORT_OPTS}" -l "${LONG_OPTS}" --name "$0" -- "$@") || { usage >&2; exit 2; }
 
-# Detect which python interpreter to use.
-for python in python3 python2; do
-    if $python -c 'import kolla_ansible' &>/dev/null; then
-        PYTHON=$python
-        break
-    fi
-done
-if [[ -z $PYTHON ]]; then
+# Check for existence of kolla_ansible module using python3 interpreter.
+if ! python3 -c 'import kolla_ansible' &>/dev/null; then
     echo "ERROR: kolla_ansible has to be available in the PYTHONPATH (e.g. installed)" >&2
     exit 1
 fi
 
 eval set -- "$ARGS"
 
-find_base_dir $PYTHON
+find_base_dir
 
 INVENTORY="${BASEDIR}/ansible/inventory/all-in-one"
 PLAYBOOK="${BASEDIR}/ansible/site.yml"