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# Software License Agreement (BSD License)
#
# Copyright (c) 2012, Willow Garage, Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following
# disclaimer in the documentation and/or other materials provided
# with the distribution.
# * Neither the name of Willow Garage, Inc. nor the names of its
# contributors may be used to endorse or promote products derived
# from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
import ast
import os
import platform
import subprocess
import sys
def generate_environment_script(env_script):
"""
Generate script code to cache environment changes of a script.
This code assumes that the script does nothing else than changing
variables that contain colon separated lists of PATHs, by
replacing or prepending.
:param env_script: str The path to the script which changes the environment
:returns: list script lines
"""
code = []
_append_header(code)
_append_comment(code, 'based on a snapshot of the environment before and after calling the setup script')
_append_comment(code, 'it emulates the modifications of the setup script without recurring computations')
# fetch current environment
env = os.environ
# fetch environment after calling setup
python_code = 'import os; print(dict(os.environ))'
output = subprocess.check_output([env_script, sys.executable, '-c', python_code])
env_after = ast.literal_eval(output.decode('utf8'))
# calculate added and modified environment variables
added = {}
modified = {}
for key, value in env_after.items():
if key not in env:
added[key] = value
elif env[key] != value:
modified[key] = [env[key], value]
code.append('')
_append_comment(code, 'new environment variables')
for key in sorted(added.keys()):
_set_variable(code, key, added[key])
code.append('')
_append_comment(code, 'modified environment variables')
for key in sorted(modified.keys()):
(old_value, new_value) = modified[key]
if new_value.endswith(os.pathsep + old_value):
variable = ('$%s' if _is_not_windows() else '%%%s%%') % key
new_value = new_value[:-len(old_value)] + variable
if _is_not_windows():
new_value = '"%s"' % new_value
_set_variable(code, key, new_value)
else:
_set_variable(code, key, new_value)
return code
def _is_not_windows():
return platform.system() != 'Windows'
def _append_header(code):
if _is_not_windows():
code.append('#!/usr/bin/env sh')
else:
code.append('@echo off')
_append_comment(code, 'generated from catkin/python/catkin/environment_cache.py')
code.append('')
def _append_comment(code, value):
if _is_not_windows():
comment_prefix = '#'
else:
comment_prefix = 'REM'
code.append('%s %s' % (comment_prefix, value))
def _set_variable(code, key, value):
if _is_not_windows():
if not value.startswith('"') or not value.endswith('"'):
value = "'%s'" % value
code.append('export %s=%s' % (key, value))
else:
code.append('set %s=%s' % (key, value))
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