453 lines
14 KiB
Python
453 lines
14 KiB
Python
"""OS routines for Mac, DOS, NT, or Posix depending on what system we're on.
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This exports:
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- all functions from posix, nt, dos, os2, mac, or ce, e.g. unlink, stat, etc.
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- os.path is one of the modules posixpath, ntpath, macpath, or dospath
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- os.name is 'posix', 'nt', 'dos', 'os2', 'mac', or 'ce'
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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 ':' or '\\')
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- os.altsep is the alternate pathname separator (None or '/')
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- os.pathsep is the component separator used in $PATH etc
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- os.linesep is the line separator in text files ('\r' or '\n' or '\r\n')
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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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"""
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import sys
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_names = sys.builtin_module_names
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altsep = None
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if 'posix' in _names:
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name = 'posix'
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linesep = '\n'
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curdir = '.'; pardir = '..'; sep = '/'; pathsep = ':'
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defpath = ':/bin:/usr/bin'
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from posix import *
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try:
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from posix import _exit
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except ImportError:
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pass
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import posixpath
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path = posixpath
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del posixpath
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elif 'nt' in _names:
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name = 'nt'
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linesep = '\r\n'
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curdir = '.'; pardir = '..'; sep = '\\'; pathsep = ';'
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defpath = '.;C:\\bin'
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from nt import *
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for i in ['_exit']:
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try:
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exec "from nt import " + i
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except ImportError:
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pass
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import ntpath
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path = ntpath
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del ntpath
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elif 'dos' in _names:
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name = 'dos'
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linesep = '\r\n'
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curdir = '.'; pardir = '..'; sep = '\\'; pathsep = ';'
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defpath = '.;C:\\bin'
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from dos import *
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try:
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from dos import _exit
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except ImportError:
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pass
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import dospath
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path = dospath
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del dospath
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elif 'os2' in _names:
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name = 'os2'
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linesep = '\r\n'
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curdir = '.'; pardir = '..'; sep = '\\'; pathsep = ';'
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defpath = '.;C:\\bin'
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from os2 import *
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try:
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from os2 import _exit
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except ImportError:
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pass
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import ntpath
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path = ntpath
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del ntpath
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elif 'mac' in _names:
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name = 'mac'
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linesep = '\r'
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curdir = ':'; pardir = '::'; sep = ':'; pathsep = '\n'
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defpath = ':'
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from mac import *
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try:
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from mac import _exit
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except ImportError:
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pass
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import macpath
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path = macpath
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del macpath
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elif 'ce' in _names:
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name = 'ce'
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linesep = '\r\n'
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curdir = '.'; pardir = '..'; sep = '\\'; pathsep = ';'
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defpath = '\\Windows'
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from ce import *
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for i in ['_exit']:
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try:
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exec "from ce import " + i
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except ImportError:
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pass
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# We can use the standard Windows path.
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import ntpath
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path = ntpath
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del ntpath
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else:
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raise ImportError, 'no os specific module found'
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del _names
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sys.modules['os.path'] = path
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# Super directory utilities.
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# (Inspired by Eric Raymond; the doc strings are mostly his)
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def makedirs(name, mode=0777):
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"""makedirs(path [, mode=0777]) -> None
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Super-mkdir; create a leaf directory and all intermediate ones.
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Works like mkdir, except that any intermediate path segment (not
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just the rightmost) will be created if it does not exist. This is
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recursive.
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"""
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head, tail = path.split(name)
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if head and tail and not path.exists(head):
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makedirs(head, mode)
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mkdir(name, mode)
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def removedirs(name):
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"""removedirs(path) -> None
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Super-rmdir; remove a leaf directory and empty all intermediate
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ones. Works like rmdir except that, if the leaf directory is
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successfully removed, directories corresponding to rightmost path
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segments will be pruned way until either the whole path is
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consumed or an error occurs. Errors during this latter phase are
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ignored -- they generally mean that a directory was not empty.
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"""
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rmdir(name)
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head, tail = path.split(name)
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while head and tail:
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try:
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rmdir(head)
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except error:
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break
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head, tail = path.split(head)
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def renames(old, new):
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"""renames(old, new) -> None
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Super-rename; create directories as necessary and delete any left
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empty. Works like rename, except creation of any intermediate
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directories needed to make the new pathname good is attempted
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first. After the rename, directories corresponding to rightmost
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path segments of the old name will be pruned way until either the
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whole path is consumed or a nonempty directory is found.
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Note: this function can fail with the new directory structure made
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if you lack permissions needed to unlink the leaf directory or
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file.
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"""
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head, tail = path.split(new)
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if head and tail and not path.exists(head):
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makedirs(head)
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rename(old, new)
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head, tail = path.split(old)
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if head and tail:
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try:
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removedirs(head)
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except error:
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pass
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# Make sure os.environ exists, at least
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try:
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environ
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except NameError:
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environ = {}
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def execl(file, *args):
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"""execl(file, *args)
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Execute the executable file with argument list args, replacing the
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current process. """
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execv(file, args)
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def execle(file, *args):
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"""execle(file, *args, env)
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Execute the executable file with argument list args and
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environment env, replacing the current process. """
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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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"""execlp(file, *args)
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Execute the executable file (which is searched for along $PATH)
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with argument list args, replacing the current process. """
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execvp(file, args)
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def execlpe(file, *args):
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"""execlpe(file, *args, env)
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Execute the executable file (which is searched for along $PATH)
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with argument list args and environment env, replacing the current
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process. """
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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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"""execp(file, args)
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Execute the executable file (which is searched for along $PATH)
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with argument list args, replacing the current process.
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args may be a list or tupe of strings. """
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_execvpe(file, args)
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def execvpe(file, args, env):
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"""execv(file, args, env)
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Execute the executable file (which is searched for along $PATH)
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with argument list args and environment env , replacing the
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current process.
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args may be a list or tupe of strings. """
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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 is not None:
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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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PATH = envpath.split(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(), ('blah',))
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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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# Change environ to automatically call putenv() if it exists
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try:
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# This will fail if there's no putenv
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putenv
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except NameError:
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pass
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else:
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import UserDict
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if name in ('os2', 'nt', 'dos'): # Where Env Var Names Must Be UPPERCASE
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# But we store them as upper case
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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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data = self.data
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for k, v in environ.items():
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data[k.upper()] = v
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def __setitem__(self, key, item):
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putenv(key, item)
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self.data[key.upper()] = item
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def __getitem__(self, key):
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return self.data[key.upper()]
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def __delitem__(self, key):
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del self.data[key.upper()]
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def has_key(self, key):
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return self.data.has_key(key.upper())
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def get(self, key, failobj=None):
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return self.data.get(key.upper(), failobj)
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def update(self, dict):
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for k, v in dict.items():
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self[k] = v
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else: # Where Env Var Names Can Be Mixed Case
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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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def update(self, dict):
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for k, v in dict.items():
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self[k] = v
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environ = _Environ(environ)
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def getenv(key, default=None):
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"""Get an environment variable, return None if it doesn't exist.
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The optional second argument can specify an alternative default."""
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return environ.get(key, default)
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def _exists(name):
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try:
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eval(name)
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return 1
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except NameError:
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return 0
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# Supply spawn*() (probably only for Unix)
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if _exists("fork") and not _exists("spawnv") and _exists("execv"):
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P_WAIT = 0
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P_NOWAIT = P_NOWAITO = 1
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# XXX Should we support P_DETACH? I suppose it could fork()**2
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# and close the std I/O streams. Also, P_OVERLAY is the same
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# as execv*()?
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def _spawnvef(mode, file, args, env, func):
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# Internal helper; func is the exec*() function to use
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pid = fork()
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if not pid:
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# Child
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try:
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if env is None:
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func(file, args)
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else:
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func(file, args, env)
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except:
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_exit(127)
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else:
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# Parent
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if mode == P_NOWAIT:
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return pid # Caller is responsible for waiting!
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while 1:
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wpid, sts = waitpid(pid, 0)
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if WIFSTOPPED(sts):
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continue
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elif WIFSIGNALED(sts):
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return -WTERMSIG(sts)
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elif WIFEXITED(sts):
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return WEXITSTATUS(sts)
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else:
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raise error, "Not stopped, signaled or exited???"
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def spawnv(mode, file, args):
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"""spawnv(mode, file, args) -> integer
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Execute file with arguments from args in a subprocess.
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If mode == P_NOWAIT return the pid of the process.
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If mode == P_WAIT return the process's exit code if it exits normally;
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otherwise return -SIG, where SIG is the signal that killed it. """
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return _spawnvef(mode, file, args, None, execv)
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def spawnve(mode, file, args, env):
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"""spawnve(mode, file, args, env) -> integer
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Execute file with arguments from args in a subprocess with the
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specified environment.
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If mode == P_NOWAIT return the pid of the process.
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If mode == P_WAIT return the process's exit code if it exits normally;
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otherwise return -SIG, where SIG is the signal that killed it. """
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return _spawnvef(mode, file, args, env, execve)
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# Note: spawnvp[e] is't currently supported on Windows
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def spawnvp(mode, file, args):
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"""spawnvp(mode, file, args) -> integer
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Execute file (which is looked for along $PATH) with arguments from
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args in a subprocess.
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If mode == P_NOWAIT return the pid of the process.
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If mode == P_WAIT return the process's exit code if it exits normally;
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otherwise return -SIG, where SIG is the signal that killed it. """
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return _spawnvef(mode, file, args, None, execvp)
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def spawnvpe(mode, file, args, env):
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"""spawnvpe(mode, file, args, env) -> integer
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Execute file (which is looked for along $PATH) with arguments from
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args in a subprocess with the supplied environment.
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If mode == P_NOWAIT return the pid of the process.
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If mode == P_WAIT return the process's exit code if it exits normally;
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otherwise return -SIG, where SIG is the signal that killed it. """
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return _spawnvef(mode, file, args, env, execvpe)
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if _exists("spawnv"):
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# These aren't supplied by the basic Windows code
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# but can be easily implemented in Python
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def spawnl(mode, file, *args):
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"""spawnl(mode, file, *args) -> integer
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Execute file with arguments from args in a subprocess.
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If mode == P_NOWAIT return the pid of the process.
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If mode == P_WAIT return the process's exit code if it exits normally;
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otherwise return -SIG, where SIG is the signal that killed it. """
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return spawnv(mode, file, args)
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def spawnle(mode, file, *args):
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"""spawnle(mode, file, *args, env) -> integer
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Execute file with arguments from args in a subprocess with the
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supplied environment.
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If mode == P_NOWAIT return the pid of the process.
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If mode == P_WAIT return the process's exit code if it exits normally;
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otherwise return -SIG, where SIG is the signal that killed it. """
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env = args[-1]
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return spawnve(mode, file, args[:-1], env)
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if _exists("spawnvp"):
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# At the moment, Windows doesn't implement spawnvp[e],
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# so it won't have spawnlp[e] either.
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def spawnlp(mode, file, *args):
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"""spawnlp(mode, file, *args, env) -> integer
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Execute file (which is looked for along $PATH) with arguments from
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args in a subprocess with the supplied environment.
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If mode == P_NOWAIT return the pid of the process.
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If mode == P_WAIT return the process's exit code if it exits normally;
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otherwise return -SIG, where SIG is the signal that killed it. """
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return spawnvp(mode, file, args)
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def spawnlpe(mode, file, *args):
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"""spawnlpe(mode, file, *args, env) -> integer
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Execute file (which is looked for along $PATH) with arguments from
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args in a subprocess with the supplied environment.
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If mode == P_NOWAIT return the pid of the process.
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If mode == P_WAIT return the process's exit code if it exits normally;
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otherwise return -SIG, where SIG is the signal that killed it. """
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env = args[-1]
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return spawnvpe(mode, file, args[:-1], env)
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