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a8f8b50bd7
set the MACOSX_DEPLOYMENT_TARGET env variable for the interpreter process
on OS X. This could cause failures in non-distutils subprocesses and was
unreliable since tests or user programs could modify the interpreter
environment after distutils set it. Instead, have distutils set the
the deployment target only in the environment of each build subprocess.
Continue to use the previous algorithm for deriving the deployment target
value:
if MACOSX_DEPLOYMENT_TARGET is not set in the interpreter's env:
use the interpreter build configure MACOSX_DEPLOYMENT_TARGET
elif the MACOSX_DEPLOYMENT_TARGET env value >= configure value:
use the env MACOSX_DEPLOYMENT_TARGET
else: # env value less than interpreter build configure value
raise exception
This allows building extensions that can only run on newer versions of
the OS than the version python was built for, for example with a python
built for 10.3 or later and an extension that needs to be built for 10.5.
196 lines
7.6 KiB
Python
196 lines
7.6 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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__revision__ = "$Id$"
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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 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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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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elif os.name == 'os2':
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_spawn_os2(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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raise DistutilsExecError(
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"command '%s' failed: %s" % (cmd[0], 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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raise DistutilsExecError(
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"command '%s' failed with exit status %d" % (cmd[0], rc))
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def _spawn_os2(cmd, search_path=1, verbose=0, dry_run=0):
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executable = cmd[0]
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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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# spawnv for OS/2 EMX 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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raise DistutilsExecError(
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"command '%s' failed: %s" % (cmd[0], 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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log.debug("command '%s' failed with exit status %d" % (cmd[0], rc))
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raise DistutilsExecError(
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"command '%s' failed with exit status %d" % (cmd[0], 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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exec_fn = search_path and os.execvp or os.execv
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exec_args = [cmd[0], cmd]
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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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exec_args.append(env)
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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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exec_fn(*exec_args)
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except OSError as e:
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sys.stderr.write("unable to execute %s: %s\n"
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% (cmd[0], e.strerror))
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os._exit(1)
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sys.stderr.write("unable to execute %s for unknown reasons" % cmd[0])
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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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import errno
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if exc.errno == errno.EINTR:
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continue
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raise DistutilsExecError(
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"command '%s' failed: %s" % (cmd[0], exc.args[-1]))
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if os.WIFSIGNALED(status):
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raise DistutilsExecError(
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"command '%s' terminated by signal %d"
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% (cmd[0], 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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raise DistutilsExecError(
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"command '%s' failed with exit status %d"
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% (cmd[0], exit_status))
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elif os.WIFSTOPPED(status):
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continue
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else:
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raise DistutilsExecError(
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"unknown error executing '%s': termination status %d"
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% (cmd[0], 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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if path is None:
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path = os.environ['PATH']
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paths = path.split(os.pathsep)
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base, ext = os.path.splitext(executable)
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if (sys.platform == 'win32' or os.name == 'os2') and (ext != '.exe'):
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executable = executable + '.exe'
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if not os.path.isfile(executable):
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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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else:
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return executable
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