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109 lines
3.4 KiB
109 lines
3.4 KiB
"""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 .errors import DistutilsExecError |
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from .debug import DEBUG |
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from ._log import log |
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def spawn(cmd, search_path=1, verbose=0, dry_run=0, env=None): # noqa: C901 |
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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( |
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"command {!r} failed: {}".format(cmd, exc.args[-1]) |
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) 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 {}".format(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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