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annotate Lib/distutils/spawn.py @ 51749:1408feec0084 3.0

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Merged revisions 69798 via svnmerge from svn+ssh://pythondev@svn.python.org/python/branches/py3k ................ r69798 | benjamin.peterson | 2009-02-19 22:02:38 -0600 (Thu, 19 Feb 2009) | 13 lines Merged revisions 69769,69776 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r69769 | georg.brandl | 2009-02-19 02:30:06 -0600 (Thu, 19 Feb 2009) | 1 line #5310, #3558: fix operator precedence table. ........ r69776 | georg.brandl | 2009-02-19 10:34:51 -0600 (Thu, 19 Feb 2009) | 2 lines #5317: update IronPython URL. ........ ................
author Benjamin Peterson <benjamin@python.org>
date Fri, 20 Feb 2009 04:05:32 +0000
parents d0465e782b01
children 5e4d070565e7
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
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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, 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
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17 process. 'cmd' is just the argument list for the new process, ie.
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18 cmd[0] is the program to run and cmd[1:] are the rest of its arguments.
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19 There is no way to run a program with a name different from that of its
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20 executable.
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21
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22 If 'search_path' is true (the default), the system's executable
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23 search path will be used to find the program; otherwise, cmd[0]
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24 must be the exact path to the executable. If 'dry_run' is true,
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25 the command will not actually be run.
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26
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27 Raise DistutilsExecError if running the program fails in any way; just
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28 return on success.
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29 """
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30 if os.name == 'posix':
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31 _spawn_posix(cmd, search_path, dry_run=dry_run)
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32 elif os.name == 'nt':
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33 _spawn_nt(cmd, search_path, dry_run=dry_run)
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34 elif os.name == 'os2':
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35 _spawn_os2(cmd, search_path, dry_run=dry_run)
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36 else:
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37 raise DistutilsPlatformError(
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38 "don't know how to spawn programs on platform '%s'" % os.name)
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39
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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: just
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43 wraps every argument which contains blanks in double quotes, and
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44 returns a new argument list.
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45 """
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46 # XXX this doesn't seem very robust to me -- but if the Windows guys
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47 # say it'll work, I guess I'll have to accept it. (What if an arg
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48 # contains quotes? What other magic characters, other than spaces,
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49 # have to be escaped? Is there an escaping mechanism other than
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50 # quoting?)
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51 for i in range(len(args)):
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52 if args[i].find(' ') != -1:
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53 args[i] = '"%s"' % args[i]
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54 return args
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55
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56 def _spawn_nt(cmd, search_path=1, verbose=0, dry_run=0):
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57 executable = cmd[0]
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58 cmd = _nt_quote_args(cmd)
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59 if search_path:
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60 # either we find one or it stays the same
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61 executable = find_executable(executable) or executable
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62 log.info(' '.join([executable] + cmd[1:]))
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63 if not dry_run:
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64 # spawn for NT requires a full path to the .exe
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65 try:
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66 rc = os.spawnv(os.P_WAIT, executable, cmd)
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67 except OSError as exc:
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68 # this seems to happen when the command isn't found
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69 raise DistutilsExecError(
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70 "command '%s' failed: %s" % (cmd[0], exc.args[-1]))
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71 if rc != 0:
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72 # and this reflects the command running but failing
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73 raise DistutilsExecError(
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74 "command '%s' failed with exit status %d" % (cmd[0], rc))
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75
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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 #cmd = _nt_quote_args(cmd)
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80 if search_path:
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81 # either we find one or it stays the same
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82 executable = find_executable(executable) or executable
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83 log.info(' '.join([executable] + cmd[1:]))
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84 if not dry_run:
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85 # spawnv for OS/2 EMX requires a full path to the .exe
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86 try:
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87 rc = os.spawnv(os.P_WAIT, executable, cmd)
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88 except OSError as exc:
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89 # this seems to happen when the command isn't found
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90 raise DistutilsExecError(
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91 "command '%s' failed: %s" % (cmd[0], exc.args[-1]))
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92 if rc != 0:
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93 # and this reflects the command running but failing
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94 print("command '%s' failed with exit status %d" % (cmd[0], rc))
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95 raise DistutilsExecError(
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96 "command '%s' failed with exit status %d" % (cmd[0], rc))
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97
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98
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99 def _spawn_posix(cmd, search_path=1, verbose=0, dry_run=0):
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100 log.info(' '.join(cmd))
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101 if dry_run:
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102 return
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103 exec_fn = search_path and os.execvp or os.execv
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104
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105 pid = os.fork()
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106 if pid == 0: # in the child
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107 try:
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108 exec_fn(cmd[0], cmd)
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109 except OSError as e:
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110 sys.stderr.write("unable to execute %s: %s\n"
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111 % (cmd[0], e.strerror))
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112 os._exit(1)
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113
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114 sys.stderr.write("unable to execute %s for unknown reasons" % cmd[0])
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115 os._exit(1)
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116 else: # in the parent
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117 # Loop until the child either exits or is terminated by a signal
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118 # (ie. keep waiting if it's merely stopped)
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119 while True:
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120 try:
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121 (pid, status) = os.waitpid(pid, 0)
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122 except OSError as exc:
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123 import errno
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124 if exc.errno == errno.EINTR:
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125 continue
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126 raise DistutilsExecError(
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127 "command '%s' failed: %s" % (cmd[0], exc.args[-1]))
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128 if os.WIFSIGNALED(status):
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129 raise DistutilsExecError(
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130 "command '%s' terminated by signal %d"
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131 % (cmd[0], os.WTERMSIG(status)))
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132 elif os.WIFEXITED(status):
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133 exit_status = os.WEXITSTATUS(status)
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134 if exit_status == 0:
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135 return # hey, it succeeded!
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136 else:
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137 raise DistutilsExecError(
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138 "command '%s' failed with exit status %d"
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139 % (cmd[0], exit_status))
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140 elif os.WIFSTOPPED(status):
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141 continue
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142 else:
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143 raise DistutilsExecError(
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144 "unknown error executing '%s': termination status %d"
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145 % (cmd[0], status))
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146
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147
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148 def find_executable(executable, path=None):
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149 """Try to find 'executable' in the directories listed in 'path' (a
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150 string listing directories separated by 'os.pathsep'; defaults to
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151 os.environ['PATH']). Returns the complete filename or None if not
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152 found.
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153 """
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154 if path is None:
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155 path = os.environ['PATH']
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156 paths = path.split(os.pathsep)
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157 (base, ext) = os.path.splitext(executable)
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158 if (sys.platform == 'win32' or os.name == 'os2') and (ext != '.exe'):
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159 executable = executable + '.exe'
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160 if not os.path.isfile(executable):
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161 for p in paths:
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162 f = os.path.join(p, executable)
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163 if os.path.isfile(f):
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164 # the file exists, we have a shot at spawn working
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165 return f
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166 return None
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167 else:
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168 return executable