204 lines
7.7 KiB
Python
204 lines
7.7 KiB
Python
"""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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from distutils.errors import DistutilsPlatformError, DistutilsExecError
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from distutils.debug import DEBUG
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from distutils import log
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def spawn(cmd, search_path=1, verbose=0, dry_run=0):
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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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if os.name == 'posix':
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_spawn_posix(cmd, search_path, dry_run=dry_run)
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elif os.name == 'nt':
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_spawn_nt(cmd, search_path, dry_run=dry_run)
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else:
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raise DistutilsPlatformError(
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"don't know how to spawn programs on platform '%s'" % os.name)
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def _nt_quote_args(args):
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"""Quote command-line arguments for DOS/Windows conventions.
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Just wraps every argument which contains blanks in double quotes, and
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returns a new argument list.
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"""
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# XXX this doesn't seem very robust to me -- but if the Windows guys
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# say it'll work, I guess I'll have to accept it. (What if an arg
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# contains quotes? What other magic characters, other than spaces,
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# have to be escaped? Is there an escaping mechanism other than
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# quoting?)
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for i, arg in enumerate(args):
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if ' ' in arg:
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args[i] = '"%s"' % arg
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return args
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def _spawn_nt(cmd, search_path=1, verbose=0, dry_run=0):
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executable = cmd[0]
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cmd = _nt_quote_args(cmd)
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if search_path:
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# either we find one or it stays the same
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executable = find_executable(executable) or executable
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log.info(' '.join([executable] + cmd[1:]))
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if not dry_run:
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# spawn for NT requires a full path to the .exe
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try:
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rc = os.spawnv(os.P_WAIT, executable, cmd)
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except OSError as exc:
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# this seems to happen when the command isn't found
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if not DEBUG:
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cmd = executable
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raise DistutilsExecError(
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"command %r failed: %s" % (cmd, exc.args[-1]))
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if rc != 0:
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# and this reflects the command running but failing
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if not DEBUG:
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cmd = executable
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raise DistutilsExecError(
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"command %r failed with exit status %d" % (cmd, rc))
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if sys.platform == 'darwin':
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from distutils import sysconfig
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_cfg_target = None
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_cfg_target_split = None
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def _spawn_posix(cmd, search_path=1, verbose=0, dry_run=0):
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log.info(' '.join(cmd))
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if dry_run:
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return
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executable = cmd[0]
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exec_fn = search_path and os.execvp or os.execv
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env = None
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if sys.platform == 'darwin':
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global _cfg_target, _cfg_target_split
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if _cfg_target is None:
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_cfg_target = sysconfig.get_config_var(
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'MACOSX_DEPLOYMENT_TARGET') or ''
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if _cfg_target:
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_cfg_target_split = [int(x) for x in _cfg_target.split('.')]
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if _cfg_target:
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# ensure that the deployment target of build process is not less
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# than that used when the interpreter was built. This ensures
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# extension modules are built with correct compatibility values
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cur_target = os.environ.get('MACOSX_DEPLOYMENT_TARGET', _cfg_target)
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if _cfg_target_split > [int(x) for x in cur_target.split('.')]:
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my_msg = ('$MACOSX_DEPLOYMENT_TARGET mismatch: '
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'now "%s" but "%s" during configure'
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% (cur_target, _cfg_target))
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raise DistutilsPlatformError(my_msg)
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env = dict(os.environ,
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MACOSX_DEPLOYMENT_TARGET=cur_target)
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exec_fn = search_path and os.execvpe or os.execve
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pid = os.fork()
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if pid == 0: # in the child
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try:
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if env is None:
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exec_fn(executable, cmd)
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else:
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exec_fn(executable, cmd, env)
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except OSError as e:
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if not DEBUG:
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cmd = executable
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sys.stderr.write("unable to execute %r: %s\n"
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% (cmd, e.strerror))
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os._exit(1)
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if not DEBUG:
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cmd = executable
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sys.stderr.write("unable to execute %r for unknown reasons" % cmd)
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os._exit(1)
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else: # in the parent
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# Loop until the child either exits or is terminated by a signal
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# (ie. keep waiting if it's merely stopped)
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while True:
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try:
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pid, status = os.waitpid(pid, 0)
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except OSError as exc:
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if not DEBUG:
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cmd = executable
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raise DistutilsExecError(
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"command %r failed: %s" % (cmd, exc.args[-1]))
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if os.WIFSIGNALED(status):
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if not DEBUG:
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cmd = executable
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raise DistutilsExecError(
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"command %r terminated by signal %d"
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% (cmd, os.WTERMSIG(status)))
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elif os.WIFEXITED(status):
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exit_status = os.WEXITSTATUS(status)
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if exit_status == 0:
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return # hey, it succeeded!
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else:
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if not DEBUG:
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cmd = executable
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raise DistutilsExecError(
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"command %r failed with exit status %d"
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% (cmd, exit_status))
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elif os.WIFSTOPPED(status):
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continue
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else:
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if not DEBUG:
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cmd = executable
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raise DistutilsExecError(
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"unknown error executing %r: termination status %d"
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% (cmd, status))
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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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