Heat templates for deploying OpenStack
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tripleo-heat-templates/container_config_scripts/pyshim.sh

45 lines
1.4 KiB

#!/bin/bash
# Copyright 2018 Red Hat Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
#
# Usage: pyshim.sh <script and/or arguments>
#
# Unfortunately THT doesn't know which version of python might be in a
# container so we need this script to be able to try python3 or python2
# depending on availability. Since this is a temporary shim until we've
# fully cut over to python3, we check for the existence of python3 first
# before falling back to python2. This will help in the transition from
# python2 based containers to python3.
show_usage() {
echo "Usage: pyshim.sh <script and/or arguments>"
}
if [ $# -lt 1 ]
then
show_usage
exit 1
fi
set -x
if command -v python3 >/dev/null; then
python3 "$@"
elif command -v python2 >/dev/null; then
python2 "$@"
elif command -v python >/dev/null; then
python "$@"
else
echo "ERROR: python is not available!"
exit 1
fi