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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 .errors import DistutilsExecError | |
from .debug import DEBUG | |
from ._log 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 | |