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#!/usr/bin/env bash
# Microsoft Azure Linux Agent
#
# Copyright 2018 Microsoft Corporation
#
# 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.
#
#
# Returns the path of the Python executable used to start the Agent.
#
set -euo pipefail
# if the agent is running, get the python command from 'exe' in the /proc file system
if test -e /run/waagent.pid; then
exe="/proc/$(cat /run/waagent.pid)/exe"
if test -e "$exe"; then
# exe is a symbolic link; return its target
readlink -f "$exe"
exit 0
fi
fi
# try all the instances of 'python' and 'python3' in $PATH
for path in $(echo "$PATH" | tr ':' '\n'); do
if [[ -e $path ]]; then
for python in $(find "$path" -maxdepth 1 -name python3 -or -name python); do
if $python -c 'import azurelinuxagent' 2> /dev/null; then
echo "$python"
exit 0
fi
done
fi
done
# try some well-known locations
declare -a known_locations=(
"/usr/share/oem/python/bin/python"
)
for python in "${known_locations[@]}"
do
if $python -c 'import azurelinuxagent' 2> /dev/null; then
echo "$python"
exit 0
fi
done
exit 1
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