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