| """OS routines for Mac, DOS, NT, or Posix depending on what system we're on. |
| |
| This exports: |
| - all functions from posix, nt, dos, os2, mac, or ce, e.g. unlink, stat, etc. |
| - os.path is one of the modules posixpath, ntpath, macpath, or dospath |
| - os.name is 'posix', 'nt', 'dos', 'os2', 'mac', or 'ce' |
| - 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.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 |
| |
| 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 |
| |
| _names = sys.builtin_module_names |
| |
| altsep = None |
| |
| if 'posix' in _names: |
| name = 'posix' |
| linesep = '\n' |
| curdir = '.'; pardir = '..'; sep = '/'; pathsep = ':' |
| defpath = ':/bin:/usr/bin' |
| from posix import * |
| try: |
| from posix import _exit |
| except ImportError: |
| pass |
| import posixpath |
| path = posixpath |
| del posixpath |
| elif 'nt' in _names: |
| name = 'nt' |
| linesep = '\r\n' |
| curdir = '.'; pardir = '..'; sep = '\\'; pathsep = ';' |
| defpath = '.;C:\\bin' |
| from nt import * |
| for i in ['_exit']: |
| try: |
| exec "from nt import " + i |
| except ImportError: |
| pass |
| import ntpath |
| path = ntpath |
| del ntpath |
| elif 'dos' in _names: |
| name = 'dos' |
| linesep = '\r\n' |
| curdir = '.'; pardir = '..'; sep = '\\'; pathsep = ';' |
| defpath = '.;C:\\bin' |
| from dos import * |
| try: |
| from dos import _exit |
| except ImportError: |
| pass |
| import dospath |
| path = dospath |
| del dospath |
| elif 'os2' in _names: |
| name = 'os2' |
| linesep = '\r\n' |
| curdir = '.'; pardir = '..'; sep = '\\'; pathsep = ';' |
| defpath = '.;C:\\bin' |
| from os2 import * |
| try: |
| from os2 import _exit |
| except ImportError: |
| pass |
| import ntpath |
| path = ntpath |
| del ntpath |
| elif 'mac' in _names: |
| name = 'mac' |
| linesep = '\r' |
| curdir = ':'; pardir = '::'; sep = ':'; pathsep = '\n' |
| defpath = ':' |
| from mac import * |
| try: |
| from mac import _exit |
| except ImportError: |
| pass |
| import macpath |
| path = macpath |
| del macpath |
| elif 'ce' in _names: |
| name = 'ce' |
| linesep = '\r\n' |
| curdir = '.'; pardir = '..'; sep = '\\'; pathsep = ';' |
| defpath = '\\Windows' |
| from ce import * |
| for i in ['_exit']: |
| try: |
| exec "from ce import " + i |
| except ImportError: |
| pass |
| # We can use the standard Windows path. |
| import ntpath |
| path = ntpath |
| del ntpath |
| else: |
| raise ImportError, 'no os specific module found' |
| |
| del _names |
| |
| sys.modules['os.path'] = path |
| |
| # Super directory utilities. |
| # (Inspired by Eric Raymond; the doc strings are mostly his) |
| |
| def makedirs(name, mode=0777): |
| """makedirs(path [, mode=0777]) -> None |
| |
| 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 head and tail and not path.exists(head): |
| makedirs(head, mode) |
| mkdir(name, mode) |
| |
| def removedirs(name): |
| """removedirs(path) -> None |
| |
| Super-rmdir; remove a leaf directory and empty all intermediate |
| ones. Works like rmdir except that, if the leaf directory is |
| successfully removed, directories corresponding to rightmost path |
| segments will be pruned way 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) |
| while head and tail: |
| try: |
| rmdir(head) |
| except error: |
| break |
| head, tail = path.split(head) |
| |
| def renames(old, new): |
| """renames(old, new) -> None |
| |
| 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 |
| |
| # Make sure os.environ exists, at least |
| try: |
| environ |
| except NameError: |
| environ = {} |
| |
| def execl(file, *args): |
| execv(file, args) |
| |
| def execle(file, *args): |
| env = args[-1] |
| execve(file, args[:-1], env) |
| |
| def execlp(file, *args): |
| execvp(file, args) |
| |
| def execlpe(file, *args): |
| env = args[-1] |
| execvpe(file, args[:-1], env) |
| |
| def execvp(file, args): |
| _execvpe(file, args) |
| |
| def execvpe(file, args, env): |
| _execvpe(file, args, env) |
| |
| _notfound = None |
| def _execvpe(file, args, env=None): |
| if env is not None: |
| func = execve |
| argrest = (args, env) |
| else: |
| func = execv |
| argrest = (args,) |
| env = environ |
| global _notfound |
| head, tail = path.split(file) |
| if head: |
| apply(func, (file,) + argrest) |
| return |
| if env.has_key('PATH'): |
| envpath = env['PATH'] |
| else: |
| envpath = defpath |
| import string |
| PATH = string.splitfields(envpath, pathsep) |
| if not _notfound: |
| import tempfile |
| # Exec a file that is guaranteed not to exist |
| try: execv(tempfile.mktemp(), ()) |
| except error, _notfound: pass |
| exc, arg = error, _notfound |
| for dir in PATH: |
| fullname = path.join(dir, file) |
| try: |
| apply(func, (fullname,) + argrest) |
| except error, (errno, msg): |
| if errno != arg[0]: |
| exc, arg = error, (errno, msg) |
| raise exc, arg |
| |
| # Change environ to automatically call putenv() if it exists |
| try: |
| # This will fail if there's no putenv |
| putenv |
| except NameError: |
| pass |
| else: |
| import UserDict |
| |
| if name in ('os2', 'nt', 'dos'): # Where Env Var Names Must Be UPPERCASE |
| # But we store them as upper case |
| import string |
| class _Environ(UserDict.UserDict): |
| def __init__(self, environ): |
| UserDict.UserDict.__init__(self) |
| data = self.data |
| upper = string.upper |
| for k, v in environ.items(): |
| data[upper(k)] = v |
| def __setitem__(self, key, item): |
| putenv(key, item) |
| key = string.upper(key) |
| self.data[key] = item |
| def __getitem__(self, key): |
| return self.data[string.upper(key)] |
| def has_key(self, key): |
| return self.data.has_key(string.upper(key)) |
| |
| else: # Where Env Var Names Can Be Mixed Case |
| class _Environ(UserDict.UserDict): |
| def __init__(self, environ): |
| UserDict.UserDict.__init__(self) |
| self.data = environ |
| def __setitem__(self, key, item): |
| putenv(key, item) |
| self.data[key] = item |
| |
| 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 alternative default.""" |
| return environ.get(key, default) |
| |
| def _exists(name): |
| try: |
| eval(name) |
| return 1 |
| except NameError: |
| return 0 |
| |
| # Supply spawn*() (probably only for Unix) |
| if _exists("fork") and not _exists("spawnv") and _exists("execv"): |
| |
| P_WAIT = 0 |
| P_NOWAIT = P_NOWAITO = 1 |
| |
| # XXX Should we support P_DETACH? I suppose it could fork()**2 |
| # and close the std I/O streams. Also, P_OVERLAY is the same |
| # as execv*()? |
| |
| def _spawnvef(mode, file, args, env, func): |
| # Internal helper; func is the exec*() function to use |
| pid = fork() |
| if not pid: |
| # Child |
| try: |
| if env is None: |
| func(file, args) |
| else: |
| func(file, args, env) |
| except: |
| _exit(127) |
| else: |
| # Parent |
| if mode == P_NOWAIT: |
| return pid # Caller is responsible for waiting! |
| while 1: |
| wpid, sts = waitpid(pid, 0) |
| if WIFSTOPPED(sts): |
| continue |
| elif WIFSIGNALED(sts): |
| return -WTERMSIG(sts) |
| elif WIFEXITED(sts): |
| return WEXITSTATUS(sts) |
| else: |
| raise error, "Not stopped, signaled or exited???" |
| |
| def spawnv(mode, file, args): |
| return _spawnvef(mode, file, args, None, execv) |
| |
| def spawnve(mode, file, args, env): |
| return _spawnvef(mode, file, args, env, execve) |
| |
| # Note: spawnvp[e] is't currently supported on Windows |
| |
| def spawnvp(mode, file, args): |
| return _spawnvef(mode, file, args, None, execvp) |
| |
| def spawnvpe(mode, file, args, env): |
| return _spawnvef(mode, file, args, env, execvpe) |
| |
| if _exists("spawnv"): |
| # These aren't supplied by the basic Windows code |
| # but can be easily implemented in Python |
| |
| def spawnl(mode, file, *args): |
| return spawnv(mode, file, args) |
| |
| def spawnle(mode, file, *args): |
| env = args[-1] |
| return spawnve(mode, file, args[:-1], env) |
| |
| if _exists("spawnvp"): |
| # At the moment, Windows doesn't implement spawnvp[e], |
| # so it won't have spawnlp[e] either. |
| def spawnlp(mode, file, *args): |
| return spawnvp(mode, file, args) |
| |
| def spawnlpe(mode, file, *args): |
| env = args[-1] |
| return spawnvpe(mode, file, args[:-1], env) |