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annotate Lib/distutils/spawn.py @ 70817:dd775b1561ba

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author Georg Brandl <georg@python.org>
date Tue, 14 Jun 2011 21:09:55 +0200
parents 5e4d070565e7
children b95eee310931
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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
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12 import os
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13
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14 from distutils.errors import DistutilsPlatformError, DistutilsExecError
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15 from distutils import log
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16
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17 def spawn(cmd, search_path=1, verbose=0, dry_run=0):
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18 """Run another program, specified as a command list 'cmd', in a new process.
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19
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20 'cmd' is just the argument list for the new process, ie.
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21 cmd[0] is the program to run and cmd[1:] are the rest of its arguments.
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22 There is no way to run a program with a name different from that of its
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23 executable.
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24
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25 If 'search_path' is true (the default), the system's executable
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26 search path will be used to find the program; otherwise, cmd[0]
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27 must be the exact path to the executable. If 'dry_run' is true,
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28 the command will not actually be run.
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29
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30 Raise DistutilsExecError if running the program fails in any way; just
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31 return on success.
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32 """
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33 if os.name == 'posix':
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34 _spawn_posix(cmd, search_path, dry_run=dry_run)
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35 elif os.name == 'nt':
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36 _spawn_nt(cmd, search_path, dry_run=dry_run)
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37 elif os.name == 'os2':
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38 _spawn_os2(cmd, search_path, dry_run=dry_run)
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39 else:
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40 raise DistutilsPlatformError(
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41 "don't know how to spawn programs on platform '%s'" % os.name)
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42
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43 def _nt_quote_args(args):
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44 """Quote command-line arguments for DOS/Windows conventions.
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45
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46 Just wraps every argument which contains blanks in double quotes, and
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47 returns a new argument list.
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48 """
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49 # XXX this doesn't seem very robust to me -- but if the Windows guys
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50 # say it'll work, I guess I'll have to accept it. (What if an arg
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51 # contains quotes? What other magic characters, other than spaces,
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52 # have to be escaped? Is there an escaping mechanism other than
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53 # quoting?)
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54 for i, arg in enumerate(args):
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55 if ' ' in arg:
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56 args[i] = '"%s"' % arg
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57 return args
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58
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59 def _spawn_nt(cmd, search_path=1, verbose=0, dry_run=0):
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60 executable = cmd[0]
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61 cmd = _nt_quote_args(cmd)
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62 if search_path:
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63 # either we find one or it stays the same
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64 executable = find_executable(executable) or executable
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65 log.info(' '.join([executable] + cmd[1:]))
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66 if not dry_run:
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67 # spawn for NT requires a full path to the .exe
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68 try:
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69 rc = os.spawnv(os.P_WAIT, executable, cmd)
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70 except OSError as exc:
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71 # this seems to happen when the command isn't found
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72 raise DistutilsExecError(
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73 "command '%s' failed: %s" % (cmd[0], exc.args[-1]))
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74 if rc != 0:
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75 # and this reflects the command running but failing
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76 raise DistutilsExecError(
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77 "command '%s' failed with exit status %d" % (cmd[0], rc))
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78
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79 def _spawn_os2(cmd, search_path=1, verbose=0, dry_run=0):
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80 executable = cmd[0]
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81 if search_path:
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82 # either we find one or it stays the same
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83 executable = find_executable(executable) or executable
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84 log.info(' '.join([executable] + cmd[1:]))
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85 if not dry_run:
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86 # spawnv for OS/2 EMX requires a full path to the .exe
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87 try:
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88 rc = os.spawnv(os.P_WAIT, executable, cmd)
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89 except OSError as exc:
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90 # this seems to happen when the command isn't found
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91 raise DistutilsExecError(
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92 "command '%s' failed: %s" % (cmd[0], exc.args[-1]))
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93 if rc != 0:
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94 # and this reflects the command running but failing
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95 log.debug("command '%s' failed with exit status %d" % (cmd[0], rc))
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96 raise DistutilsExecError(
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97 "command '%s' failed with exit status %d" % (cmd[0], rc))
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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 pid = os.fork()
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105 if pid == 0: # in the child
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106 try:
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107 exec_fn(cmd[0], cmd)
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108 except OSError as e:
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109 sys.stderr.write("unable to execute %s: %s\n"
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110 % (cmd[0], e.strerror))
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111 os._exit(1)
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112
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113 sys.stderr.write("unable to execute %s for unknown reasons" % cmd[0])
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114 os._exit(1)
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115 else: # in the parent
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116 # Loop until the child either exits or is terminated by a signal
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117 # (ie. keep waiting if it's merely stopped)
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118 while True:
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119 try:
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120 pid, status = os.waitpid(pid, 0)
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121 except OSError as exc:
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122 import errno
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123 if exc.errno == errno.EINTR:
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124 continue
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125 raise DistutilsExecError(
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126 "command '%s' failed: %s" % (cmd[0], exc.args[-1]))
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127 if os.WIFSIGNALED(status):
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128 raise DistutilsExecError(
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129 "command '%s' terminated by signal %d"
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130 % (cmd[0], os.WTERMSIG(status)))
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131 elif os.WIFEXITED(status):
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132 exit_status = os.WEXITSTATUS(status)
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133 if exit_status == 0:
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134 return # hey, it succeeded!
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135 else:
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136 raise DistutilsExecError(
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137 "command '%s' failed with exit status %d"
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138 % (cmd[0], exit_status))
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139 elif os.WIFSTOPPED(status):
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140 continue
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141 else:
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142 raise DistutilsExecError(
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143 "unknown error executing '%s': termination status %d"
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144 % (cmd[0], status))
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145
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146 def find_executable(executable, path=None):
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147 """Tries to find 'executable' in the directories listed in 'path'.
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148
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149 A string listing directories separated by 'os.pathsep'; defaults to
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150 os.environ['PATH']. Returns the complete filename or None if not found.
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151 """
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152 if path is None:
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153 path = os.environ['PATH']
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154
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155 paths = path.split(os.pathsep)
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156 base, ext = os.path.splitext(executable)
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157
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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
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161 if not os.path.isfile(executable):
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162 for p in paths:
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163 f = os.path.join(p, executable)
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164 if os.path.isfile(f):
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165 # the file exists, we have a shot at spawn working
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166 return f
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167 return None
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168 else:
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169 return executable