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# (c) Continuum Analytics, Inc. / http://continuum.io
# All Rights Reserved
# Copied from conda constructor at commit d91adfb1c49666768ef9fd625d02276af6ddb0c9
# This file is under the BSD license:
#
# Copyright (c) 2016, Continuum Analytics, 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 Continuum Analytics, 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 CONTINUUM ANALYTICS 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.
#
# Helper script for adding and removing entries in the
# Windows system path from the NSIS installer.
__all__ = ['remove_from_system_path', 'add_to_system_path', 'broadcast_environment_settings_change']
import sys
import os, ctypes
from os import path
from ctypes import wintypes
if sys.version_info[0] >= 3:
import winreg as reg
else:
import _winreg as reg
HWND_BROADCAST = 0xffff
WM_SETTINGCHANGE = 0x001A
SMTO_ABORTIFHUNG = 0x0002
SendMessageTimeout = ctypes.windll.user32.SendMessageTimeoutW
SendMessageTimeout.restype = None #wintypes.LRESULT
SendMessageTimeout.argtypes = [wintypes.HWND, wintypes.UINT, wintypes.WPARAM,
wintypes.LPCWSTR, wintypes.UINT, wintypes.UINT, ctypes.POINTER(wintypes.DWORD)]
def sz_expand(value, value_type):
if value_type == reg.REG_EXPAND_SZ:
return reg.ExpandEnvironmentStrings(value)
else:
return value
def remove_from_system_path(pathname, allusers=True, path_env_var='PATH'):
"""Removes all entries from the path which match the value in 'pathname'
You must call broadcast_environment_settings_change() after you are finished
manipulating the environment with this and other functions.
For example,
# Remove Anaconda from PATH
remove_from_system_path(r'C:\Anaconda')
broadcast_environment_settings_change()
"""
pathname = path.normcase(path.normpath(pathname))
envkeys = [(reg.HKEY_CURRENT_USER, r'Environment')]
if allusers:
envkeys.append((reg.HKEY_LOCAL_MACHINE,
r'SYSTEM\CurrentControlSet\Control\Session Manager\Environment'))
for root, keyname in envkeys:
key = reg.OpenKey(root, keyname, 0,
reg.KEY_QUERY_VALUE|reg.KEY_SET_VALUE)
reg_value = None
try:
reg_value = reg.QueryValueEx(key, path_env_var)
except WindowsError:
# This will happen if we're a non-admin install and the user has
# no PATH variable.
reg.CloseKey(key)
continue
try:
any_change = False
results = []
for v in reg_value[0].split(os.pathsep):
vexp = sz_expand(v, reg_value[1])
# Check if the expanded path matches the
# requested path in a normalized way
if path.normcase(path.normpath(vexp)) == pathname:
any_change = True
else:
# Append the original unexpanded version to the results
results.append(v)
modified_path = os.pathsep.join(results)
if any_change:
reg.SetValueEx(key, path_env_var, 0, reg_value[1], modified_path)
except:
# If there's an error (e.g. when there is no PATH for the current
# user), continue on to try the next root/keyname pair
reg.CloseKey(key)
def add_to_system_path(paths, allusers=True, path_env_var='PATH'):
"""Adds the requested paths to the system PATH variable.
You must call broadcast_environment_settings_change() after you are finished
manipulating the environment with this and other functions.
"""
# Make sure it's a list
if not issubclass(type(paths), list):
paths = [paths]
# Ensure all the paths are valid before we start messing with the
# registry.
new_paths = None
for p in paths:
p = path.abspath(p)
if not path.isdir(p):
raise RuntimeError(
'Directory "%s" does not exist, '
'cannot add it to the path' % p
)
if new_paths:
new_paths = new_paths + os.pathsep + p
else:
new_paths = p
if allusers:
# All Users
root, keyname = (reg.HKEY_LOCAL_MACHINE,
r'SYSTEM\CurrentControlSet\Control\Session Manager\Environment')
else:
# Just Me
root, keyname = (reg.HKEY_CURRENT_USER, r'Environment')
key = reg.OpenKey(root, keyname, 0,
reg.KEY_QUERY_VALUE|reg.KEY_SET_VALUE)
reg_type = None
reg_value = None
try:
try:
reg_value = reg.QueryValueEx(key, path_env_var)
except WindowsError:
# This will happen if we're a non-admin install and the user has
# no PATH variable; in which case, we can write our new paths
# directly.
reg_type = reg.REG_EXPAND_SZ
final_value = new_paths
else:
reg_type = reg_value[1]
# If we're an admin install, put us at the end of PATH. If we're
# a user install, throw caution to the wind and put us at the
# start. (This ensures we're picked up as the default python out
# of the box, regardless of whether or not the user has other
# pythons lying around on their PATH, which would complicate
# things. It's also the same behavior used on *NIX.)
if allusers:
final_value = reg_value[0] + os.pathsep + new_paths
else:
final_value = new_paths + os.pathsep + reg_value[0]
reg.SetValueEx(key, path_env_var, 0, reg_type, final_value)
finally:
reg.CloseKey(key)
def broadcast_environment_settings_change():
"""Broadcasts to the system indicating that master environment variables have changed.
This must be called after using the other functions in this module to
manipulate environment variables.
"""
SendMessageTimeout(HWND_BROADCAST, WM_SETTINGCHANGE, 0, u'Environment',
SMTO_ABORTIFHUNG, 5000, ctypes.pointer(wintypes.DWORD()))
def main():
if len(sys.argv) < 3:
sys.exit("Too few arguments: {}".format(sys.argv))
elif len(sys.argv) > 3:
sys.exit("Too many arguments: {}".format(sys.argv))
if sys.argv[1] == 'add':
add_to_system_path(sys.argv[2])
elif sys.argv[1] == 'add_user':
add_to_system_path(sys.argv[2], allusers=False)
elif sys.argv[1] == 'remove':
remove_from_system_path(sys.argv[2])
elif sys.argv[1] == 'remove_user':
remove_from_system_path(sys.argv[2], allusers=False)
broadcast_environment_settings_change()
if __name__ == '__main__':
main()