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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 DistutilsExecError | |
| from distutils.debug import DEBUG | |
| from distutils import log | |
| def spawn(cmd, search_path=1, verbose=0, dry_run=0, env=None): # noqa: C901 | |
| """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: {}".format(cmd, exc.args[-1]) | |
| ) from exc | |
| if exitcode: | |
| if not DEBUG: | |
| cmd = cmd[0] | |
| raise DistutilsExecError( | |
| "command {!r} failed with exit code {}".format(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 | |