Personal Computer World 2009 February/PCWFEB09.iso/Software/Linux/Kubuntu 8.10/kubuntu-8.10-desktop-i386.iso/casper/filesystem.squashfs/usr/lib/python2.5/os.pyc

Python Compiled Bytecode | 2008-10-29 | 25KB | 832 lines

# Source Generated with Decompyle++
# File: in.pyc (Python 2.5)

"""OS routines for Mac, NT, or Posix depending on what system we're on.

This exports:
  - all functions from posix, nt, os2, mac, or ce, e.g. unlink, stat, etc.
  - os.path is one of the modules posixpath, ntpath, or macpath
  - os.name is 'posix', 'nt', 'os2', 'mac', 'ce' or 'riscos'
  - os.curdir is a string representing the current directory ('.' or ':')
  - os.pardir is a string representing the parent directory ('..' or '::')
  - os.sep is the (or a most common) pathname separator ('/' or ':' or '\\\\')
  - os.extsep is the extension separator ('.' or '/')
  - os.altsep is the alternate pathname separator (None or '/')
  - os.pathsep is the component separator used in $PATH etc
  - os.linesep is the line separator in text files ('\\r' or '\\n' or '\\r\\n')
  - os.defpath is the default search path for executables
  - os.devnull is the file path of the null device ('/dev/null', etc.)

Programs that import and use 'os' stand a better chance of being
portable between different platforms.  Of course, they must then
only use functions that are defined by all platforms (e.g., unlink
and opendir), and leave all pathname manipulation to os.path
(e.g., split and join).
"""
import sys
import errno
_names = sys.builtin_module_names
__all__ = [
    'altsep',
    'curdir',
    'pardir',
    'sep',
    'pathsep',
    'linesep',
    'defpath',
    'name',
    'path',
    'devnull',
    'SEEK_SET',
    'SEEK_CUR',
    'SEEK_END']

def _get_exports_list(module):

    try:
        return list(module.__all__)
    except AttributeError:
        return _[1]
    except:
        []


if 'posix' in _names:
    name = 'posix'
    linesep = '\n'
    from posix import *

    try:
        from posix import _exit
    except ImportError:
        pass

    import posixpath as path
    import posix
    __all__.extend(_get_exports_list(posix))
    del posix
elif 'nt' in _names:
    name = 'nt'
    linesep = '\r\n'
    from nt import *

    try:
        from nt import _exit
    except ImportError:
        pass

    import ntpath as path
    import nt
    __all__.extend(_get_exports_list(nt))
    del nt
elif 'os2' in _names:
    name = 'os2'
    linesep = '\r\n'
    from os2 import *

    try:
        from os2 import _exit
    except ImportError:
        pass

    if sys.version.find('EMX GCC') == -1:
        import ntpath as path
    else:
        import os2emxpath as path
        from _emx_link import link
    import os2
    __all__.extend(_get_exports_list(os2))
    del os2
elif 'mac' in _names:
    name = 'mac'
    linesep = '\r'
    from mac import *

    try:
        from mac import _exit
    except ImportError:
        pass

    import macpath as path
    import mac
    __all__.extend(_get_exports_list(mac))
    del mac
elif 'ce' in _names:
    name = 'ce'
    linesep = '\r\n'
    from ce import *

    try:
        from ce import _exit
    except ImportError:
        pass

    import ntpath as path
    import ce
    __all__.extend(_get_exports_list(ce))
    del ce
elif 'riscos' in _names:
    name = 'riscos'
    linesep = '\n'
    from riscos import *

    try:
        from riscos import _exit
    except ImportError:
        pass

    import riscospath as path
    import riscos
    __all__.extend(_get_exports_list(riscos))
    del riscos
else:
    raise ImportError, 'no os specific module found'
sys.modules['os.path'] = path
from os.path import curdir, pardir, sep, pathsep, defpath, extsep, altsep, devnull
del _names
SEEK_SET = 0
SEEK_CUR = 1
SEEK_END = 2

def makedirs(name, mode = 511):
    '''makedirs(path [, mode=0777])

    Super-mkdir; create a leaf directory and all intermediate ones.
    Works like mkdir, except that any intermediate path segment (not
    just the rightmost) will be created if it does not exist.  This is
    recursive.

    '''
    (head, tail) = path.split(name)
    if not tail:
        (head, tail) = path.split(head)

    if head and tail and not path.exists(head):

        try:
            makedirs(head, mode)
        except OSError:
            e = None
            if e.errno != errno.EEXIST:
                raise

        except:
            e.errno != errno.EEXIST

        if tail == curdir:
            return None


    mkdir(name, mode)


def removedirs(name):
    '''removedirs(path)

    Super-rmdir; remove a leaf directory and all empty intermediate
    ones.  Works like rmdir except that, if the leaf directory is
    successfully removed, directories corresponding to rightmost path
    segments will be pruned away until either the whole path is
    consumed or an error occurs.  Errors during this latter phase are
    ignored -- they generally mean that a directory was not empty.

    '''
    rmdir(name)
    (head, tail) = path.split(name)
    if not tail:
        (head, tail) = path.split(head)

    while head and tail:

        try:
            rmdir(head)
        except error:
            break

        (head, tail) = path.split(head)


def renames(old, new):
    '''renames(old, new)

    Super-rename; create directories as necessary and delete any left
    empty.  Works like rename, except creation of any intermediate
    directories needed to make the new pathname good is attempted
    first.  After the rename, directories corresponding to rightmost
    path segments of the old name will be pruned way until either the
    whole path is consumed or a nonempty directory is found.

    Note: this function can fail with the new directory structure made
    if you lack permissions needed to unlink the leaf directory or
    file.

    '''
    (head, tail) = path.split(new)
    if head and tail and not path.exists(head):
        makedirs(head)

    rename(old, new)
    (head, tail) = path.split(old)
    if head and tail:

        try:
            removedirs(head)
        except error:
            pass
        except:
            None<EXCEPTION MATCH>error


    None<EXCEPTION MATCH>error

__all__.extend([
    'makedirs',
    'removedirs',
    'renames'])

def walk(top, topdown = True, onerror = None):
    '''Directory tree generator.

    For each directory in the directory tree rooted at top (including top
    itself, but excluding \'.\' and \'..\'), yields a 3-tuple

        dirpath, dirnames, filenames

    dirpath is a string, the path to the directory.  dirnames is a list of
    the names of the subdirectories in dirpath (excluding \'.\' and \'..\').
    filenames is a list of the names of the non-directory files in dirpath.
    Note that the names in the lists are just names, with no path components.
    To get a full path (which begins with top) to a file or directory in
    dirpath, do os.path.join(dirpath, name).

    If optional arg \'topdown\' is true or not specified, the triple for a
    directory is generated before the triples for any of its subdirectories
    (directories are generated top down).  If topdown is false, the triple
    for a directory is generated after the triples for all of its
    subdirectories (directories are generated bottom up).

    When topdown is true, the caller can modify the dirnames list in-place
    (e.g., via del or slice assignment), and walk will only recurse into the
    subdirectories whose names remain in dirnames; this can be used to prune
    the search, or to impose a specific order of visiting.  Modifying
    dirnames when topdown is false is ineffective, since the directories in
    dirnames have already been generated by the time dirnames itself is
    generated.

    By default errors from the os.listdir() call are ignored.  If
    optional arg \'onerror\' is specified, it should be a function; it
    will be called with one argument, an os.error instance.  It can
    report the error to continue with the walk, or raise the exception
    to abort the walk.  Note that the filename is available as the
    filename attribute of the exception object.

    Caution:  if you pass a relative pathname for top, don\'t change the
    current working directory between resumptions of walk.  walk never
    changes the current directory, and assumes that the client doesn\'t
    either.

    Example:

    import os
    from os.path import join, getsize
    for root, dirs, files in os.walk(\'python/Lib/email\'):
        print root, "consumes",
        print sum([getsize(join(root, name)) for name in files]),
        print "bytes in", len(files), "non-directory files"
        if \'CVS\' in dirs:
            dirs.remove(\'CVS\')  # don\'t visit CVS directories
    '''
    join = join
    isdir = isdir
    islink = islink
    import os.path

    try:
        names = listdir(top)
    except error:
        err = None
        if onerror is not None:
            onerror(err)

        return None

    dirs = []
    nondirs = []
    for name in names:
        if isdir(join(top, name)):
            dirs.append(name)
            continue
        nondirs.append(name)

    if topdown:
        yield (top, dirs, nondirs)

    for name in dirs:
        path = join(top, name)
        if not islink(path):
            for x in walk(path, topdown, onerror):
                yield x


    if not topdown:
        yield (top, dirs, nondirs)


__all__.append('walk')

try:
    environ
except NameError:
    environ = { }


def execl(file, *args):
    '''execl(file, *args)

    Execute the executable file with argument list args, replacing the
    current process. '''
    execv(file, args)


def execle(file, *args):
    '''execle(file, *args, env)

    Execute the executable file with argument list args and
    environment env, replacing the current process. '''
    env = args[-1]
    execve(file, args[:-1], env)


def execlp(file, *args):
    '''execlp(file, *args)

    Execute the executable file (which is searched for along $PATH)
    with argument list args, replacing the current process. '''
    execvp(file, args)


def execlpe(file, *args):
    '''execlpe(file, *args, env)

    Execute the executable file (which is searched for along $PATH)
    with argument list args and environment env, replacing the current
    process. '''
    env = args[-1]
    execvpe(file, args[:-1], env)


def execvp(file, args):
    '''execp(file, args)

    Execute the executable file (which is searched for along $PATH)
    with argument list args, replacing the current process.
    args may be a list or tuple of strings. '''
    _execvpe(file, args)


def execvpe(file, args, env):
    '''execvpe(file, args, env)

    Execute the executable file (which is searched for along $PATH)
    with argument list args and environment env , replacing the
    current process.
    args may be a list or tuple of strings. '''
    _execvpe(file, args, env)

__all__.extend([
    'execl',
    'execle',
    'execlp',
    'execlpe',
    'execvp',
    'execvpe'])

def _execvpe(file, args, env = None):
    if env is not None:
        func = execve
        argrest = (args, env)
    else:
        func = execv
        argrest = (args,)
        env = environ
    (head, tail) = path.split(file)
    if head:
        func(file, *argrest)
        return None

    if 'PATH' in env:
        envpath = env['PATH']
    else:
        envpath = defpath
    PATH = envpath.split(pathsep)
    saved_exc = None
    saved_tb = None
    for dir in PATH:
        fullname = path.join(dir, file)

        try:
            func(fullname, *argrest)
        continue
        except error:
            e = None
            tb = sys.exc_info()[2]
            if e.errno != errno.ENOENT and e.errno != errno.ENOTDIR and saved_exc is None:
                saved_exc = e
                saved_tb = tb

            saved_exc is None



    if saved_exc:
        raise error, saved_exc, saved_tb

    raise error, e, tb


try:
    putenv
except NameError:
    pass

import UserDict
if name in ('os2', 'nt'):

    def unsetenv(key):
        putenv(key, '')


if name == 'riscos':
    from riscosenviron import _Environ
elif name in ('os2', 'nt'):

    class _Environ(UserDict.IterableUserDict):

        def __init__(self, environ):
            UserDict.UserDict.__init__(self)
            data = self.data
            for k, v in environ.items():
                data[k.upper()] = v



        def __setitem__(self, key, item):
            putenv(key, item)
            self.data[key.upper()] = item


        def __getitem__(self, key):
            return self.data[key.upper()]


        try:
            unsetenv
        except NameError:

            def __delitem__(self, key):
                del self.data[key.upper()]



        def __delitem__(self, key):
            unsetenv(key)
            del self.data[key.upper()]


        def has_key(self, key):
            return key.upper() in self.data


        def __contains__(self, key):
            return key.upper() in self.data


        def get(self, key, failobj = None):
            return self.data.get(key.upper(), failobj)


        def update(self, dict = None, **kwargs):
            if dict:

                try:
                    keys = dict.keys()
                except AttributeError:
                    for k, v in dict:
                        self[k] = v


                for k in keys:
                    self[k] = dict[k]


            if kwargs:
                self.update(kwargs)



        def copy(self):
            return dict(self)


else:

    class _Environ(UserDict.IterableUserDict):

        def __init__(self, environ):
            UserDict.UserDict.__init__(self)
            self.data = environ


        def __setitem__(self, key, item):
            putenv(key, item)
            self.data[key] = item


        def update(self, dict = None, **kwargs):
            if dict:

                try:
                    keys = dict.keys()
                except AttributeError:
                    for k, v in dict:
                        self[k] = v


                for k in keys:
                    self[k] = dict[k]


            if kwargs:
                self.update(kwargs)



        try:
            unsetenv
        except NameError:
            pass


        def __delitem__(self, key):
            unsetenv(key)
            del self.data[key]


        def copy(self):
            return dict(self)


environ = _Environ(environ)

def getenv(key, default = None):
    """Get an environment variable, return None if it doesn't exist.
    The optional second argument can specify an alternate default."""
    return environ.get(key, default)

__all__.append('getenv')

def _exists(name):

    try:
        eval(name)
        return True
    except NameError:
        return False


if _exists('fork') and not _exists('spawnv') and _exists('execv'):
    P_WAIT = 0
    P_NOWAIT = P_NOWAITO = 1

    def _spawnvef(mode, file, args, env, func):
        pid = fork()
        if not pid:

            try:
                if env is None:
                    func(file, args)
                else:
                    func(file, args, env)
            _exit(127)

        elif mode == P_NOWAIT:
            return pid

        while None:
            (wpid, sts) = waitpid(pid, 0)
            if WIFSTOPPED(sts):
                continue
                continue
            if WIFSIGNALED(sts):
                return -WTERMSIG(sts)
                continue
            if WIFEXITED(sts):
                return WEXITSTATUS(sts)
                continue
            raise error, 'Not stopped, signaled or exited???'
            continue
            return None


    def spawnv(mode, file, args):
        """spawnv(mode, file, args) -> integer

Execute file with arguments from args in a subprocess.
If mode == P_NOWAIT return the pid of the process.
If mode == P_WAIT return the process's exit code if it exits normally;
otherwise return -SIG, where SIG is the signal that killed it. """
        return _spawnvef(mode, file, args, None, execv)


    def spawnve(mode, file, args, env):
        """spawnve(mode, file, args, env) -> integer

Execute file with arguments from args in a subprocess with the
specified environment.
If mode == P_NOWAIT return the pid of the process.
If mode == P_WAIT return the process's exit code if it exits normally;
otherwise return -SIG, where SIG is the signal that killed it. """
        return _spawnvef(mode, file, args, env, execve)


    def spawnvp(mode, file, args):
        """spawnvp(mode, file, args) -> integer

Execute file (which is looked for along $PATH) with arguments from
args in a subprocess.
If mode == P_NOWAIT return the pid of the process.
If mode == P_WAIT return the process's exit code if it exits normally;
otherwise return -SIG, where SIG is the signal that killed it. """
        return _spawnvef(mode, file, args, None, execvp)


    def spawnvpe(mode, file, args, env):
        """spawnvpe(mode, file, args, env) -> integer

Execute file (which is looked for along $PATH) with arguments from
args in a subprocess with the supplied environment.
If mode == P_NOWAIT return the pid of the process.
If mode == P_WAIT return the process's exit code if it exits normally;
otherwise return -SIG, where SIG is the signal that killed it. """
        return _spawnvef(mode, file, args, env, execvpe)


if _exists('spawnv'):

    def spawnl(mode, file, *args):
        """spawnl(mode, file, *args) -> integer

Execute file with arguments from args in a subprocess.
If mode == P_NOWAIT return the pid of the process.
If mode == P_WAIT return the process's exit code if it exits normally;
otherwise return -SIG, where SIG is the signal that killed it. """
        return spawnv(mode, file, args)


    def spawnle(mode, file, *args):
        """spawnle(mode, file, *args, env) -> integer

Execute file with arguments from args in a subprocess with the
supplied environment.
If mode == P_NOWAIT return the pid of the process.
If mode == P_WAIT return the process's exit code if it exits normally;
otherwise return -SIG, where SIG is the signal that killed it. """
        env = args[-1]
        return spawnve(mode, file, args[:-1], env)

    __all__.extend([
        'spawnv',
        'spawnve',
        'spawnl',
        'spawnle'])

if _exists('spawnvp'):

    def spawnlp(mode, file, *args):
        """spawnlp(mode, file, *args) -> integer

Execute file (which is looked for along $PATH) with arguments from
args in a subprocess with the supplied environment.
If mode == P_NOWAIT return the pid of the process.
If mode == P_WAIT return the process's exit code if it exits normally;
otherwise return -SIG, where SIG is the signal that killed it. """
        return spawnvp(mode, file, args)


    def spawnlpe(mode, file, *args):
        """spawnlpe(mode, file, *args, env) -> integer

Execute file (which is looked for along $PATH) with arguments from
args in a subprocess with the supplied environment.
If mode == P_NOWAIT return the pid of the process.
If mode == P_WAIT return the process's exit code if it exits normally;
otherwise return -SIG, where SIG is the signal that killed it. """
        env = args[-1]
        return spawnvpe(mode, file, args[:-1], env)

    __all__.extend([
        'spawnvp',
        'spawnvpe',
        'spawnlp',
        'spawnlpe'])

if _exists('fork'):
    if not _exists('popen2'):

        def popen2(cmd, mode = 't', bufsize = -1):
            """Execute the shell command 'cmd' in a sub-process.  On UNIX, 'cmd'
            may be a sequence, in which case arguments will be passed directly to
            the program without shell intervention (as with os.spawnv()).  If 'cmd'
            is a string it will be passed to the shell (as with os.system()). If
            'bufsize' is specified, it sets the buffer size for the I/O pipes.  The
            file objects (child_stdin, child_stdout) are returned."""
            import popen2
            (stdout, stdin) = popen2.popen2(cmd, bufsize)
            return (stdin, stdout)

        __all__.append('popen2')

    if not _exists('popen3'):

        def popen3(cmd, mode = 't', bufsize = -1):
            """Execute the shell command 'cmd' in a sub-process.  On UNIX, 'cmd'
            may be a sequence, in which case arguments will be passed directly to
            the program without shell intervention (as with os.spawnv()).  If 'cmd'
            is a string it will be passed to the shell (as with os.system()). If
            'bufsize' is specified, it sets the buffer size for the I/O pipes.  The
            file objects (child_stdin, child_stdout, child_stderr) are returned."""
            import popen2
            (stdout, stdin, stderr) = popen2.popen3(cmd, bufsize)
            return (stdin, stdout, stderr)

        __all__.append('popen3')

    if not _exists('popen4'):

        def popen4(cmd, mode = 't', bufsize = -1):
            """Execute the shell command 'cmd' in a sub-process.  On UNIX, 'cmd'
            may be a sequence, in which case arguments will be passed directly to
            the program without shell intervention (as with os.spawnv()).  If 'cmd'
            is a string it will be passed to the shell (as with os.system()). If
            'bufsize' is specified, it sets the buffer size for the I/O pipes.  The
            file objects (child_stdin, child_stdout_stderr) are returned."""
            import popen2
            (stdout, stdin) = popen2.popen4(cmd, bufsize)
            return (stdin, stdout)

        __all__.append('popen4')


import copy_reg as _copy_reg

def _make_stat_result(tup, dict):
    return stat_result(tup, dict)


def _pickle_stat_result(sr):
    (type, args) = sr.__reduce__()
    return (_make_stat_result, args)


try:
    _copy_reg.pickle(stat_result, _pickle_stat_result, _make_stat_result)
except NameError:
    pass


def _make_statvfs_result(tup, dict):
    return statvfs_result(tup, dict)


def _pickle_statvfs_result(sr):
    (type, args) = sr.__reduce__()
    return (_make_statvfs_result, args)


try:
    _copy_reg.pickle(statvfs_result, _pickle_statvfs_result, _make_statvfs_result)
except NameError:
    pass

if not _exists('urandom'):

    def urandom(n):
        '''urandom(n) -> str

        Return a string of n random bytes suitable for cryptographic use.

        '''

        try:
            _urandomfd = open('/dev/urandom', O_RDONLY)
        except (OSError, IOError):
            raise NotImplementedError('/dev/urandom (or equivalent) not found')

        bytes = ''
        while len(bytes) < n:
            bytes += read(_urandomfd, n - len(bytes))
        close(_urandomfd)
        return bytes