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868b50af17
an empty argument list -- another patch he's checking in will make this illegal (the first argument should always be the program name).
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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