108 lines
3.4 KiB
Python
108 lines
3.4 KiB
Python
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"""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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Also provides the 'find_executable()' to search the path for a given
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executable name.
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"""
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import sys
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import os
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import subprocess
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from distutils.errors import DistutilsExecError
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from distutils.debug import DEBUG
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from distutils import log
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def spawn(cmd, search_path=1, verbose=0, dry_run=0, env=None):
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"""Run another program, specified as a command list 'cmd', in a new process.
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'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 arguments.
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There is no way to run a program with a name different from that of its
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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]
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must be the exact path to the executable. If 'dry_run' is true,
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the command will not actually be run.
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Raise DistutilsExecError if running the program fails in any way; just
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return on success.
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"""
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# cmd is documented as a list, but just in case some code passes a tuple
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# in, protect our %-formatting code against horrible death
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cmd = list(cmd)
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log.info(subprocess.list2cmdline(cmd))
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if dry_run:
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return
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if search_path:
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executable = find_executable(cmd[0])
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if executable is not None:
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cmd[0] = executable
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env = env if env is not None else dict(os.environ)
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if sys.platform == 'darwin':
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from distutils.util import MACOSX_VERSION_VAR, get_macosx_target_ver
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macosx_target_ver = get_macosx_target_ver()
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if macosx_target_ver:
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env[MACOSX_VERSION_VAR] = macosx_target_ver
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try:
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proc = subprocess.Popen(cmd, env=env)
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proc.wait()
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exitcode = proc.returncode
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except OSError as exc:
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if not DEBUG:
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cmd = cmd[0]
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raise DistutilsExecError("command %r failed: %s" % (cmd, exc.args[-1])) from exc
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if exitcode:
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if not DEBUG:
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cmd = cmd[0]
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raise DistutilsExecError(
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"command %r failed with exit code %s" % (cmd, exitcode)
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)
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def find_executable(executable, path=None):
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"""Tries to find 'executable' in the directories listed in 'path'.
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A string listing directories separated by 'os.pathsep'; defaults to
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os.environ['PATH']. Returns the complete filename or None if not found.
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"""
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_, ext = os.path.splitext(executable)
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if (sys.platform == 'win32') and (ext != '.exe'):
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executable = executable + '.exe'
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if os.path.isfile(executable):
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return executable
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if path is None:
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path = os.environ.get('PATH', None)
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if path is None:
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try:
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path = os.confstr("CS_PATH")
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except (AttributeError, ValueError):
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# os.confstr() or CS_PATH is not available
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path = os.defpath
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# bpo-35755: Don't use os.defpath if the PATH environment variable is
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# set to an empty string
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# PATH='' doesn't match, whereas PATH=':' looks in the current directory
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if not path:
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return None
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paths = path.split(os.pathsep)
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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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return f
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return None
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