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142 lines
3.4 KiB
Python
142 lines
3.4 KiB
Python
# os.py -- either mac, dos or posix depending on what system we're on.
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# This exports:
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# - all functions from either posix or mac, e.g., os.unlink, os.stat, etc.
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# - os.path is either module posixpath or macpath
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# - os.name is either 'posix' or 'mac'
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# - os.curdir is a string representing the current directory ('.' or ':')
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# - os.pardir is a string representing the parent directory ('..' or '::')
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# - os.sep is the (or a most common) pathname separator ('/' or ':')
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# - os.pathsep is the component separator used in $PATH etc
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# - os.defpath is the default search path for executables
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# Programs that import and use 'os' stand a better chance of being
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# portable between different platforms. Of course, they must then
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# only use functions that are defined by all platforms (e.g., unlink
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# and opendir), and leave all pathname manipulation to os.path
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# (e.g., split and join).
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_osindex = {
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'posix': ('.', '..', '/', ':', ':/bin:/usr/bin'),
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'dos': ('.', '..', '\\', ';', '.;C:\\bin'),
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'nt': ('.', '..', '\\', ';', '.;C:\\bin'),
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'mac': (':', '::', ':', '\n', ':'),
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}
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# For freeze.py script:
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if 0:
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import posix
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import posixpath
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import sys
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for name in _osindex.keys():
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if name in sys.builtin_module_names:
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curdir, pardir, sep, pathsep, defpath = _osindex[name]
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exec 'from %s import *' % name
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exec 'import %spath' % name
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exec 'path = %spath' % name
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exec 'del %spath' % name
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try:
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exec 'from %s import _exit' % name
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except ImportError:
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pass
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try:
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environ
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except:
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environ = {} # Make sure os.environ exists, at least
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break
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else:
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del name
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raise ImportError, 'no os specific module found'
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def execl(file, *args):
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execv(file, args)
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def execle(file, *args):
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env = args[-1]
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execve(file, args[:-1], env)
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def execlp(file, *args):
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execvp(file, args)
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def execlpe(file, *args):
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env = args[-1]
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execvpe(file, args[:-1], env)
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def execvp(file, args):
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_execvpe(file, args)
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def execvpe(file, args, env):
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_execvpe(file, args, env)
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_notfound = None
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def _execvpe(file, args, env = None):
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if env:
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func = execve
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argrest = (args, env)
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else:
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func = execv
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argrest = (args,)
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env = environ
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global _notfound
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head, tail = path.split(file)
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if head:
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apply(func, (file,) + argrest)
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return
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if env.has_key('PATH'):
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envpath = env['PATH']
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else:
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envpath = defpath
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import string
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PATH = string.splitfields(envpath, pathsep)
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if not _notfound:
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import tempfile
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# Exec a file that is guaranteed not to exist
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try: execv(tempfile.mktemp(), ())
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except error, _notfound: pass
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exc, arg = error, _notfound
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for dir in PATH:
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fullname = path.join(dir, file)
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try:
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apply(func, (fullname,) + argrest)
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except error, (errno, msg):
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if errno != arg[0]:
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exc, arg = error, (errno, msg)
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raise exc, arg
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# Provide listdir for Windows NT that doesn't have it built in
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if name == 'nt':
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try:
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_tmp = listdir
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del _tmp
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except NameError:
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def listdir(name):
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if path.ismount(name):
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list = ['.']
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else:
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list = ['.', '..']
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f = popen('dir/l/b ' + name, 'r')
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line = f.readline()
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while line:
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list.append(line[:-1])
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line = f.readline()
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return list
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# Change environ to automatically call putenv() if it exists
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try:
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_putenv = putenv
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except NameError:
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_putenv = None
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if _putenv:
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import UserDict
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class _Environ(UserDict.UserDict):
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def __init__(self, environ):
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UserDict.UserDict.__init__(self)
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self.data = environ
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def __setitem__(self, key, item):
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putenv(key, item)
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self.data[key] = item
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environ = _Environ(environ)
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