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612 lines
19 KiB
612 lines
19 KiB
r"""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', 'ce' or 'riscos' |
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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.extsep is the extension separator ('.' 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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#' |
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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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__all__ = ["altsep", "curdir", "pardir", "sep", "pathsep", "linesep", |
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"defpath", "name"] |
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def _get_exports_list(module): |
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try: |
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return list(module.__all__) |
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except AttributeError: |
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return [n for n in dir(module) if n[0] != '_'] |
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|
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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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import posix |
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__all__.extend(_get_exports_list(posix)) |
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del posix |
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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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import nt |
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__all__.extend(_get_exports_list(nt)) |
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del nt |
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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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import dos |
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__all__.extend(_get_exports_list(dos)) |
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del dos |
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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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import os2 |
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__all__.extend(_get_exports_list(os2)) |
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del os2 |
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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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import mac |
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__all__.extend(_get_exports_list(mac)) |
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del mac |
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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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import ce |
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__all__.extend(_get_exports_list(ce)) |
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del ce |
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elif 'riscos' in _names: |
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name = 'riscos' |
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linesep = '\n' |
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curdir = '@'; pardir = '^'; sep = '.'; pathsep = ',' |
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defpath = '<Run$Dir>' |
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from riscos import * |
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try: |
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from riscos import _exit |
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except ImportError: |
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pass |
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import riscospath |
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path = riscospath |
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del riscospath |
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import riscos |
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__all__.extend(_get_exports_list(riscos)) |
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del riscos |
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else: |
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raise ImportError, 'no os specific module found' |
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if sep=='.': |
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extsep = '/' |
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else: |
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extsep = '.' |
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__all__.append("path") |
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del _names |
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sys.modules['os.path'] = path |
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#' |
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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 not tail: |
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head, tail = path.split(head) |
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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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if not tail: |
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head, tail = path.split(head) |
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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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__all__.extend(["makedirs", "removedirs", "renames"]) |
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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 tuple of strings. """ |
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_execvpe(file, args) |
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def execvpe(file, args, env): |
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"""execvpe(file, args, env) |
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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 tuple of strings. """ |
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_execvpe(file, args, env) |
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__all__.extend(["execl","execle","execlp","execlpe","execvp","execvpe"]) |
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def _execvpe(file, args, env=None): |
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from errno import ENOENT, ENOTDIR |
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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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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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saved_exc = None |
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saved_tb = None |
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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, e: |
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tb = sys.exc_info()[2] |
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if (e.errno != ENOENT and e.errno != ENOTDIR |
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and saved_exc is None): |
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saved_exc = e |
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saved_tb = tb |
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if saved_exc: |
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raise error, saved_exc, saved_tb |
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raise error, e, tb |
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|
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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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|
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# Fake unsetenv() for Windows |
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# not sure about os2 and dos here but |
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# I'm guessing they are the same. |
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if name in ('os2', 'nt', 'dos'): |
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def unsetenv(key): |
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putenv(key, "") |
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if name == "riscos": |
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# On RISC OS, all env access goes through getenv and putenv |
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from riscosenviron import _Environ |
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elif 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.IterableUserDict): |
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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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try: |
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unsetenv |
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except NameError: |
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def __delitem__(self, key): |
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del self.data[key.upper()] |
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else: |
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def __delitem__(self, key): |
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unsetenv(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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|
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else: # Where Env Var Names Can Be Mixed Case |
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class _Environ(UserDict.IterableUserDict): |
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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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try: |
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unsetenv |
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except NameError: |
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pass |
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else: |
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def __delitem__(self, key): |
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unsetenv(key) |
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del self.data[key] |
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environ = _Environ(environ) |
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|
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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 alternate default.""" |
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return environ.get(key, default) |
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__all__.append("getenv") |
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|
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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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|
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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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|
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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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|
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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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|
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def spawnve(mode, file, args, env): |
|
"""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. |
|
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. """ |
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return _spawnvef(mode, file, args, env, execve) |
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|
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# Note: spawnvp[e] is't currently supported on Windows |
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|
|
def spawnvp(mode, file, args): |
|
"""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. |
|
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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|
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def spawnvpe(mode, file, args, env): |
|
"""spawnvpe(mode, file, args, env) -> integer |
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|
|
Execute file (which is looked for along $PATH) with arguments from |
|
args in a subprocess with the supplied environment. |
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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. """ |
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return _spawnvef(mode, file, args, env, execvpe) |
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|
|
if _exists("spawnv"): |
|
# These aren't supplied by the basic Windows code |
|
# but can be easily implemented in Python |
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|
|
def spawnl(mode, file, *args): |
|
"""spawnl(mode, file, *args) -> integer |
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|
|
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) |
|
|
|
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): |
|
"""spawnlp(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 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) |
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|
|
|
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__all__.extend(["spawnlp","spawnlpe","spawnv", "spawnve","spawnvp", |
|
"spawnvpe","spawnl","spawnle",]) |
|
|
|
|
|
# Supply popen2 etc. (for Unix) |
|
if _exists("fork"): |
|
if not _exists("popen2"): |
|
def popen2(cmd, mode="t", bufsize=-1): |
|
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): |
|
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): |
|
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: # stat_result may not exist |
|
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: # statvfs_result may not exist |
|
pass
|
|
|