Mercurial > cpython-lru_cache-weakref

annotate Lib/distutils/spawn.py @ 54294:dba767bc3155 legacy-trunk

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remove mention of old ctypes version
author Benjamin Peterson <benjamin@python.org>
date Sat, 23 May 2009 20:59:09 +0000
parents a5229237eb50
children 4283bc8c9306
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 __revision__ = "$Id$"
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10
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11 import sys, os, string
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12 from distutils.errors import *
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13 from distutils import log
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14
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15 def spawn (cmd,
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16 search_path=1,
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17 verbose=0,
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18 dry_run=0):
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19
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20 """Run another program, specified as a command list 'cmd', in a new
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21 process. 'cmd' is just the argument list for the new process, ie.
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22 cmd[0] is the program to run and cmd[1:] are the rest of its arguments.
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23 There is no way to run a program with a name different from that of its
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24 executable.
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25
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26 If 'search_path' is true (the default), the system's executable
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27 search path will be used to find the program; otherwise, cmd[0]
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28 must be the exact path to the executable. If 'dry_run' is true,
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29 the command will not actually be run.
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30
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31 Raise DistutilsExecError if running the program fails in any way; just
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32 return on success.
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33 """
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34 if os.name == 'posix':
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35 _spawn_posix(cmd, search_path, dry_run=dry_run)
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36 elif os.name == 'nt':
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37 _spawn_nt(cmd, search_path, dry_run=dry_run)
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38 elif os.name == 'os2':
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39 _spawn_os2(cmd, search_path, dry_run=dry_run)
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40 else:
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41 raise DistutilsPlatformError, \
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42 "don't know how to spawn programs on platform '%s'" % os.name
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43
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44 # spawn ()
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45
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46
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47 def _nt_quote_args (args):
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48 """Quote command-line arguments for DOS/Windows conventions: just
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49 wraps every argument which contains blanks in double quotes, and
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50 returns a new argument list.
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51 """
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52
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53 # XXX this doesn't seem very robust to me -- but if the Windows guys
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54 # say it'll work, I guess I'll have to accept it. (What if an arg
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55 # contains quotes? What other magic characters, other than spaces,
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56 # have to be escaped? Is there an escaping mechanism other than
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57 # quoting?)
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58
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59 for i in range(len(args)):
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60 if string.find(args[i], ' ') != -1:
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61 args[i] = '"%s"' % args[i]
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62 return args
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63
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64 def _spawn_nt (cmd,
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65 search_path=1,
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66 verbose=0,
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67 dry_run=0):
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68
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69 executable = cmd[0]
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70 cmd = _nt_quote_args(cmd)
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71 if search_path:
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72 # either we find one or it stays the same
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73 executable = find_executable(executable) or executable
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74 log.info(string.join([executable] + cmd[1:], ' '))
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75 if not dry_run:
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76 # spawn for NT requires a full path to the .exe
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77 try:
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78 rc = os.spawnv(os.P_WAIT, executable, cmd)
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79 except OSError, exc:
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80 # this seems to happen when the command isn't found
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81 raise DistutilsExecError, \
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82 "command '%s' failed: %s" % (cmd[0], exc[-1])
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83 if rc != 0:
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84 # and this reflects the command running but failing
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85 raise DistutilsExecError, \
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86 "command '%s' failed with exit status %d" % (cmd[0], rc)
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87
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88
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89 def _spawn_os2 (cmd,
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90 search_path=1,
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91 verbose=0,
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92 dry_run=0):
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93
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94 executable = cmd[0]
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95 #cmd = _nt_quote_args(cmd)
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96 if search_path:
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97 # either we find one or it stays the same
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98 executable = find_executable(executable) or executable
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99 log.info(string.join([executable] + cmd[1:], ' '))
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100 if not dry_run:
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101 # spawnv for OS/2 EMX requires a full path to the .exe
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102 try:
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103 rc = os.spawnv(os.P_WAIT, executable, cmd)
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104 except OSError, exc:
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105 # this seems to happen when the command isn't found
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106 raise DistutilsExecError, \
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107 "command '%s' failed: %s" % (cmd[0], exc[-1])
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108 if rc != 0:
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109 # and this reflects the command running but failing
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110 print "command '%s' failed with exit status %d" % (cmd[0], rc)
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111 raise DistutilsExecError, \
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112 "command '%s' failed with exit status %d" % (cmd[0], rc)
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113
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114
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115 def _spawn_posix (cmd,
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116 search_path=1,
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117 verbose=0,
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118 dry_run=0):
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119
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120 log.info(string.join(cmd, ' '))
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121 if dry_run:
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122 return
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123 exec_fn = search_path and os.execvp or os.execv
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124
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125 pid = os.fork()
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126
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127 if pid == 0: # in the child
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128 try:
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129 #print "cmd[0] =", cmd[0]
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130 #print "cmd =", cmd
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131 exec_fn(cmd[0], cmd)
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132 except OSError, e:
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133 sys.stderr.write("unable to execute %s: %s\n" %
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134 (cmd[0], e.strerror))
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135 os._exit(1)
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136
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137 sys.stderr.write("unable to execute %s for unknown reasons" % cmd[0])
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138 os._exit(1)
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139
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140
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141 else: # in the parent
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142 # Loop until the child either exits or is terminated by a signal
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143 # (ie. keep waiting if it's merely stopped)
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144 while 1:
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145 try:
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146 (pid, status) = os.waitpid(pid, 0)
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147 except OSError, exc:
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148 import errno
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149 if exc.errno == errno.EINTR:
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150 continue
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151 raise DistutilsExecError, \
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152 "command '%s' failed: %s" % (cmd[0], exc[-1])
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153 if os.WIFSIGNALED(status):
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154 raise DistutilsExecError, \
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155 "command '%s' terminated by signal %d" % \
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156 (cmd[0], os.WTERMSIG(status))
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157
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158 elif os.WIFEXITED(status):
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159 exit_status = os.WEXITSTATUS(status)
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160 if exit_status == 0:
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161 return # hey, it succeeded!
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162 else:
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163 raise DistutilsExecError, \
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164 "command '%s' failed with exit status %d" % \
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165 (cmd[0], exit_status)
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166
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167 elif os.WIFSTOPPED(status):
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168 continue
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169
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170 else:
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171 raise DistutilsExecError, \
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172 "unknown error executing '%s': termination status %d" % \
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173 (cmd[0], status)
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174 # _spawn_posix ()
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175
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176
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177 def find_executable(executable, path=None):
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178 """Try to find 'executable' in the directories listed in 'path' (a
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179 string listing directories separated by 'os.pathsep'; defaults to
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180 os.environ['PATH']). Returns the complete filename or None if not
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181 found.
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182 """
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183 if path is None:
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184 path = os.environ['PATH']
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185 paths = string.split(path, os.pathsep)
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186 (base, ext) = os.path.splitext(executable)
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187 if (sys.platform == 'win32' or os.name == 'os2') and (ext != '.exe'):
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188 executable = executable + '.exe'
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189 if not os.path.isfile(executable):
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190 for p in paths:
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191 f = os.path.join(p, executable)
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192 if os.path.isfile(f):
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193 # the file exists, we have a shot at spawn working
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194 return f
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195 return None
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196 else:
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197 return executable
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198
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199 # find_executable()