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annotate Lib/distutils/spawn.py @ 74135:9c19df6c8ea0 3.2

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News entry for Issue12798
author Senthil Kumaran <senthil@uthcode.com>
date Fri, 23 Dec 2011 11:11:21 +0800
parents 3e26c9033306
children 147b9d530dd0
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 """distutils.spawn
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2
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3 Provides the 'spawn()' function, a front-end to various platform-
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4 specific functions for launching another program in a sub-process.
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5 Also provides the 'find_executable()' to search the path for a given
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6 executable name.
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7 """
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8
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9 import sys
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10 import os
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11
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12 from distutils.errors import DistutilsPlatformError, DistutilsExecError
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13 from distutils import log
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14
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15 def spawn(cmd, search_path=1, verbose=0, dry_run=0):
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16 """Run another program, specified as a command list 'cmd', in a new process.
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17
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18 'cmd' is just the argument list for the new process, ie.
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19 cmd[0] is the program to run and cmd[1:] are the rest of its arguments.
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20 There is no way to run a program with a name different from that of its
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21 executable.
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22
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23 If 'search_path' is true (the default), the system's executable
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24 search path will be used to find the program; otherwise, cmd[0]
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25 must be the exact path to the executable. If 'dry_run' is true,
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26 the command will not actually be run.
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27
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28 Raise DistutilsExecError if running the program fails in any way; just
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29 return on success.
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30 """
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31 if os.name == 'posix':
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32 _spawn_posix(cmd, search_path, dry_run=dry_run)
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33 elif os.name == 'nt':
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34 _spawn_nt(cmd, search_path, dry_run=dry_run)
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35 elif os.name == 'os2':
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36 _spawn_os2(cmd, search_path, dry_run=dry_run)
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37 else:
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38 raise DistutilsPlatformError(
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39 "don't know how to spawn programs on platform '%s'" % os.name)
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40
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41 def _nt_quote_args(args):
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42 """Quote command-line arguments for DOS/Windows conventions.
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43
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44 Just wraps every argument which contains blanks in double quotes, and
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45 returns a new argument list.
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46 """
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47 # XXX this doesn't seem very robust to me -- but if the Windows guys
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48 # say it'll work, I guess I'll have to accept it. (What if an arg
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49 # contains quotes? What other magic characters, other than spaces,
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50 # have to be escaped? Is there an escaping mechanism other than
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51 # quoting?)
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52 for i, arg in enumerate(args):
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53 if ' ' in arg:
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54 args[i] = '"%s"' % arg
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55 return args
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56
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57 def _spawn_nt(cmd, search_path=1, verbose=0, dry_run=0):
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58 executable = cmd[0]
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59 cmd = _nt_quote_args(cmd)
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60 if search_path:
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61 # either we find one or it stays the same
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62 executable = find_executable(executable) or executable
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63 log.info(' '.join([executable] + cmd[1:]))
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64 if not dry_run:
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65 # spawn for NT requires a full path to the .exe
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66 try:
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67 rc = os.spawnv(os.P_WAIT, executable, cmd)
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68 except OSError as exc:
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69 # this seems to happen when the command isn't found
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70 raise DistutilsExecError(
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71 "command '%s' failed: %s" % (cmd[0], exc.args[-1]))
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72 if rc != 0:
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73 # and this reflects the command running but failing
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74 raise DistutilsExecError(
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75 "command '%s' failed with exit status %d" % (cmd[0], rc))
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76
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77 def _spawn_os2(cmd, search_path=1, verbose=0, dry_run=0):
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78 executable = cmd[0]
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79 if search_path:
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80 # either we find one or it stays the same
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81 executable = find_executable(executable) or executable
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82 log.info(' '.join([executable] + cmd[1:]))
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83 if not dry_run:
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84 # spawnv for OS/2 EMX requires a full path to the .exe
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85 try:
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86 rc = os.spawnv(os.P_WAIT, executable, cmd)
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87 except OSError as exc:
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88 # this seems to happen when the command isn't found
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89 raise DistutilsExecError(
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90 "command '%s' failed: %s" % (cmd[0], exc.args[-1]))
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91 if rc != 0:
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92 # and this reflects the command running but failing
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93 log.debug("command '%s' failed with exit status %d" % (cmd[0], rc))
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94 raise DistutilsExecError(
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95 "command '%s' failed with exit status %d" % (cmd[0], rc))
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96
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97 if sys.platform == 'darwin':
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98 from distutils import sysconfig
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99 _cfg_target = None
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100 _cfg_target_split = None
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101
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102 def _spawn_posix(cmd, search_path=1, verbose=0, dry_run=0):
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103 log.info(' '.join(cmd))
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104 if dry_run:
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105 return
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106 exec_fn = search_path and os.execvp or os.execv
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107 exec_args = [cmd[0], cmd]
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108 if sys.platform == 'darwin':
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109 global _cfg_target, _cfg_target_split
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110 if _cfg_target is None:
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111 _cfg_target = sysconfig.get_config_var(
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112 'MACOSX_DEPLOYMENT_TARGET') or ''
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113 if _cfg_target:
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114 _cfg_target_split = [int(x) for x in _cfg_target.split('.')]
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115 if _cfg_target:
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116 # ensure that the deployment target of build process is not less
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117 # than that used when the interpreter was built. This ensures
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118 # extension modules are built with correct compatibility values
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119 cur_target = os.environ.get('MACOSX_DEPLOYMENT_TARGET', _cfg_target)
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120 if _cfg_target_split > [int(x) for x in cur_target.split('.')]:
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121 my_msg = ('$MACOSX_DEPLOYMENT_TARGET mismatch: '
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122 'now "%s" but "%s" during configure'
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123 % (cur_target, _cfg_target))
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124 raise DistutilsPlatformError(my_msg)
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125 env = dict(os.environ,
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126 MACOSX_DEPLOYMENT_TARGET=cur_target)
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127 exec_fn = search_path and os.execvpe or os.execve
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128 exec_args.append(env)
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129 pid = os.fork()
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130 if pid == 0: # in the child
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131 try:
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132 exec_fn(*exec_args)
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133 except OSError as e:
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134 sys.stderr.write("unable to execute %s: %s\n"
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135 % (cmd[0], e.strerror))
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136 os._exit(1)
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137
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138 sys.stderr.write("unable to execute %s for unknown reasons" % cmd[0])
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139 os._exit(1)
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140 else: # in the parent
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141 # Loop until the child either exits or is terminated by a signal
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142 # (ie. keep waiting if it's merely stopped)
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143 while True:
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144 try:
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145 pid, status = os.waitpid(pid, 0)
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146 except OSError as exc:
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147 import errno
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148 if exc.errno == errno.EINTR:
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149 continue
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150 raise DistutilsExecError(
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151 "command '%s' failed: %s" % (cmd[0], exc.args[-1]))
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152 if os.WIFSIGNALED(status):
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153 raise DistutilsExecError(
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154 "command '%s' terminated by signal %d"
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155 % (cmd[0], os.WTERMSIG(status)))
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156 elif os.WIFEXITED(status):
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157 exit_status = os.WEXITSTATUS(status)
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158 if exit_status == 0:
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159 return # hey, it succeeded!
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160 else:
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161 raise DistutilsExecError(
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162 "command '%s' failed with exit status %d"
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163 % (cmd[0], exit_status))
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164 elif os.WIFSTOPPED(status):
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165 continue
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166 else:
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167 raise DistutilsExecError(
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168 "unknown error executing '%s': termination status %d"
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169 % (cmd[0], status))
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170
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171 def find_executable(executable, path=None):
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172 """Tries to find 'executable' in the directories listed in 'path'.
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173
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174 A string listing directories separated by 'os.pathsep'; defaults to
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175 os.environ['PATH']. Returns the complete filename or None if not found.
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176 """
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177 if path is None:
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178 path = os.environ['PATH']
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179
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180 paths = path.split(os.pathsep)
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181 base, ext = os.path.splitext(executable)
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182
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183 if (sys.platform == 'win32' or os.name == 'os2') and (ext != '.exe'):
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184 executable = executable + '.exe'
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185
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186 if not os.path.isfile(executable):
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187 for p in paths:
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188 f = os.path.join(p, executable)
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189 if os.path.isfile(f):
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190 # the file exists, we have a shot at spawn working
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191 return f
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192 return None
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193 else:
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194 return executable