150 lines
5.1 KiB
Python
150 lines
5.1 KiB
Python
"""distutils.spawn
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Provides the 'spawn()' function, a front-end to various platform-
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specific functions for launching another program in a sub-process."""
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# created 1999/07/24, Greg Ward
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__revision__ = "$Id$"
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import sys, os, string
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from distutils.errors import *
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def spawn (cmd,
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search_path=1,
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verbose=0,
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dry_run=0):
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"""Run another program, specified as a command list 'cmd', in a new
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process. 'cmd' is just the argument list for the new process, ie.
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cmd[0] is the program to run and cmd[1:] are the rest of its
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arguments. There is no way to run a program with a name different
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from that of its executable.
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If 'search_path' is true (the default), the system's executable
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search path will be used to find the program; otherwise, cmd[0] must
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be the exact path to the executable. If 'verbose' is true, a
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one-line summary of the command will be printed before it is run.
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If 'dry_run' is true, the command will not actually be run.
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Raise DistutilsExecError if running the program fails in any way;
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just return on success."""
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if os.name == 'posix':
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_spawn_posix (cmd, search_path, verbose, dry_run)
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elif os.name == 'nt':
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_spawn_nt (cmd, search_path, verbose, dry_run)
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else:
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raise DistutilsPlatformError, \
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"don't know how to spawn programs on platform '%s'" % os.name
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# spawn ()
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def _nt_quote_args (args):
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"""Obscure quoting command line arguments on NT.
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Simply quote every argument which contains blanks."""
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# XXX this doesn't seem very robust to me -- but if the Windows guys
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# say it'll work, I guess I'll have to accept it. (What if an arg
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# contains quotes? What other magic characters, other than spaces,
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# have to be escaped? Is there an escaping mechanism other than
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# quoting?)
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for i in range (len (args)):
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if string.find (args[i], ' ') != -1:
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args[i] = '"%s"' % args[i]
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return args
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def _spawn_nt (cmd,
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search_path=1,
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verbose=0,
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dry_run=0):
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executable = cmd[0]
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cmd = _nt_quote_args (cmd)
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if search_path:
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paths = string.split( os.environ['PATH'], os.pathsep)
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base,ext = os.path.splitext(executable)
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if (ext != '.exe'):
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executable = executable + '.exe'
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if not os.path.isfile(executable):
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paths.reverse() # go over the paths and keep the last one
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for p in paths:
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f = os.path.join( p, executable )
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if os.path.isfile ( f ):
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# the file exists, we have a shot at spawn working
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executable = f
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if verbose:
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print string.join ([executable] + cmd[1:], ' ')
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if not dry_run:
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# spawn for NT requires a full path to the .exe
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try:
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rc = os.spawnv (os.P_WAIT, executable, cmd)
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except OSError, exc:
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# this seems to happen when the command isn't found
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raise DistutilsExecError, \
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"command '%s' failed: %s" % (cmd[0], exc[-1])
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if rc != 0:
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# and this reflects the command running but failing
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raise DistutilsExecError, \
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"command '%s' failed with exit status %d" % (cmd[0], rc)
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def _spawn_posix (cmd,
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search_path=1,
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verbose=0,
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dry_run=0):
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if verbose:
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print string.join (cmd, ' ')
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if dry_run:
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return
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exec_fn = search_path and os.execvp or os.execv
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pid = os.fork ()
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if pid == 0: # in the child
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try:
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#print "cmd[0] =", cmd[0]
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#print "cmd =", cmd
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exec_fn (cmd[0], cmd)
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except OSError, e:
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sys.stderr.write ("unable to execute %s: %s\n" %
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(cmd[0], e.strerror))
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os._exit (1)
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sys.stderr.write ("unable to execute %s for unknown reasons" % cmd[0])
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os._exit (1)
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else: # in the parent
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# Loop until the child either exits or is terminated by a signal
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# (ie. keep waiting if it's merely stopped)
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while 1:
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(pid, status) = os.waitpid (pid, 0)
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if os.WIFSIGNALED (status):
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raise DistutilsExecError, \
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"command '%s' terminated by signal %d" % \
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(cmd[0], os.WTERMSIG (status))
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elif os.WIFEXITED (status):
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exit_status = os.WEXITSTATUS (status)
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if exit_status == 0:
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return # hey, it succeeded!
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else:
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raise DistutilsExecError, \
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"command '%s' failed with exit status %d" % \
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(cmd[0], exit_status)
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elif os.WIFSTOPPED (status):
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continue
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else:
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raise DistutilsExecError, \
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"unknown error executing '%s': termination status %d" % \
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(cmd[0], status)
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# _spawn_posix ()
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