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##############################################################################
# Copyright (c) 2013-2017, Lawrence Livermore National Security, LLC.
# Produced at the Lawrence Livermore National Laboratory.
#
# This file is part of Spack.
# Created by Todd Gamblin, tgamblin@llnl.gov, All rights reserved.
# LLNL-CODE-647188
#
# For details, see https://github.com/llnl/spack
# Please also see the NOTICE and LICENSE files for our notice and the LGPL.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License (as
# published by the Free Software Foundation) version 2.1, February 1999.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the IMPLIED WARRANTY OF
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the terms and
# conditions of the GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
##############################################################################
import os
system_paths = ['/', '/usr', '/usr/local']
suffixes = ['bin', 'bin64', 'include', 'lib', 'lib64']
system_dirs = [os.path.join(p, s) for s in suffixes for p in system_paths] + \
system_paths
def is_system_path(path):
"""Predicate that given a path returns True if it is a system path,
False otherwise.
Args:
path (str): path to a directory
Returns:
True or False
"""
return os.path.normpath(path) in system_dirs
def filter_system_paths(paths):
return [p for p in paths if not is_system_path(p)]
def get_path(name):
path = os.environ.get(name, "").strip()
if path:
return path.split(":")
else:
return []
def env_flag(name):
if name in os.environ:
value = os.environ[name].lower()
return value == "true" or value == "1"
return False
def path_set(var_name, directories):
path_str = ":".join(str(dir) for dir in directories)
os.environ[var_name] = path_str
def path_put_first(var_name, directories):
"""Puts the provided directories first in the path, adding them
if they're not already there.
"""
path = os.environ.get(var_name, "").split(':')
for dir in directories:
if dir in path:
path.remove(dir)
new_path = tuple(directories) + tuple(path)
path_set(var_name, new_path)
def dump_environment(path):
"""Dump the current environment out to a file."""
with open(path, 'w') as env_file:
for key, val in sorted(os.environ.items()):
env_file.write('export %s="%s"\n' % (key, val))
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