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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 | |
| if sys.platform == 'darwin': | |
| _cfg_target = None | |
| _cfg_target_split = None | |
| def spawn(cmd, search_path=1, verbose=0, dry_run=0): | |
| """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(' '.join(cmd)) | |
| if dry_run: | |
| return | |
| if search_path: | |
| executable = find_executable(cmd[0]) | |
| if executable is not None: | |
| cmd[0] = executable | |
| env = None | |
| if sys.platform == 'darwin': | |
| global _cfg_target, _cfg_target_split | |
| if _cfg_target is None: | |
| from distutils import sysconfig | |
| _cfg_target = sysconfig.get_config_var( | |
| 'MACOSX_DEPLOYMENT_TARGET') or '' | |
| if _cfg_target: | |
| _cfg_target_split = [int(x) for x in _cfg_target.split('.')] | |
| if _cfg_target: | |
| # Ensure that the deployment target of the build process is not | |
| # less than 10.3 if the interpreter was built for 10.3 or later. | |
| # This ensures extension modules are built with correct | |
| # compatibility values, specifically LDSHARED which can use | |
| # '-undefined dynamic_lookup' which only works on >= 10.3. | |
| cur_target = os.environ.get('MACOSX_DEPLOYMENT_TARGET', _cfg_target) | |
| cur_target_split = [int(x) for x in cur_target.split('.')] | |
| if _cfg_target_split[:2] >= [10, 3] and cur_target_split[:2] < [10, 3]: | |
| my_msg = ('$MACOSX_DEPLOYMENT_TARGET mismatch: ' | |
| 'now "%s" but "%s" during configure;' | |
| 'must use 10.3 or later' | |
| % (cur_target, _cfg_target)) | |
| raise DistutilsPlatformError(my_msg) | |
| env = dict(os.environ, | |
| MACOSX_DEPLOYMENT_TARGET=cur_target) | |
| 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 | |