mirror of
https://github.com/python/cpython
synced 2024-11-05 18:12:54 +00:00
0185f34ddc
Such functions as os.path.exists(), os.path.lexists(), os.path.isdir(), os.path.isfile(), os.path.islink(), and os.path.ismount() now return False instead of raising ValueError or its subclasses UnicodeEncodeError and UnicodeDecodeError for paths that contain characters or bytes unrepresentative at the OS level.
669 lines
22 KiB
Python
669 lines
22 KiB
Python
# Module 'ntpath' -- common operations on WinNT/Win95 pathnames
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"""Common pathname manipulations, WindowsNT/95 version.
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Instead of importing this module directly, import os and refer to this
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module as os.path.
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"""
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# strings representing various path-related bits and pieces
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# These are primarily for export; internally, they are hardcoded.
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# Should be set before imports for resolving cyclic dependency.
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curdir = '.'
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pardir = '..'
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extsep = '.'
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sep = '\\'
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pathsep = ';'
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altsep = '/'
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defpath = '.;C:\\bin'
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devnull = 'nul'
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import os
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import sys
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import stat
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import genericpath
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from genericpath import *
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__all__ = ["normcase","isabs","join","splitdrive","split","splitext",
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"basename","dirname","commonprefix","getsize","getmtime",
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"getatime","getctime", "islink","exists","lexists","isdir","isfile",
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"ismount", "expanduser","expandvars","normpath","abspath",
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"curdir","pardir","sep","pathsep","defpath","altsep",
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"extsep","devnull","realpath","supports_unicode_filenames","relpath",
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"samefile", "sameopenfile", "samestat", "commonpath"]
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def _get_bothseps(path):
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if isinstance(path, bytes):
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return b'\\/'
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else:
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return '\\/'
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# Normalize the case of a pathname and map slashes to backslashes.
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# Other normalizations (such as optimizing '../' away) are not done
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# (this is done by normpath).
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def normcase(s):
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"""Normalize case of pathname.
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Makes all characters lowercase and all slashes into backslashes."""
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s = os.fspath(s)
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try:
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if isinstance(s, bytes):
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return s.replace(b'/', b'\\').lower()
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else:
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return s.replace('/', '\\').lower()
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except (TypeError, AttributeError):
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if not isinstance(s, (bytes, str)):
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raise TypeError("normcase() argument must be str or bytes, "
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"not %r" % s.__class__.__name__) from None
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raise
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# Return whether a path is absolute.
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# Trivial in Posix, harder on Windows.
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# For Windows it is absolute if it starts with a slash or backslash (current
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# volume), or if a pathname after the volume-letter-and-colon or UNC-resource
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# starts with a slash or backslash.
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def isabs(s):
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"""Test whether a path is absolute"""
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s = os.fspath(s)
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s = splitdrive(s)[1]
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return len(s) > 0 and s[0] in _get_bothseps(s)
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# Join two (or more) paths.
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def join(path, *paths):
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path = os.fspath(path)
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if isinstance(path, bytes):
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sep = b'\\'
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seps = b'\\/'
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colon = b':'
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else:
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sep = '\\'
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seps = '\\/'
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colon = ':'
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try:
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if not paths:
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path[:0] + sep #23780: Ensure compatible data type even if p is null.
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result_drive, result_path = splitdrive(path)
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for p in map(os.fspath, paths):
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p_drive, p_path = splitdrive(p)
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if p_path and p_path[0] in seps:
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# Second path is absolute
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if p_drive or not result_drive:
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result_drive = p_drive
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result_path = p_path
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continue
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elif p_drive and p_drive != result_drive:
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if p_drive.lower() != result_drive.lower():
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# Different drives => ignore the first path entirely
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result_drive = p_drive
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result_path = p_path
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continue
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# Same drive in different case
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result_drive = p_drive
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# Second path is relative to the first
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if result_path and result_path[-1] not in seps:
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result_path = result_path + sep
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result_path = result_path + p_path
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## add separator between UNC and non-absolute path
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if (result_path and result_path[0] not in seps and
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result_drive and result_drive[-1:] != colon):
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return result_drive + sep + result_path
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return result_drive + result_path
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except (TypeError, AttributeError, BytesWarning):
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genericpath._check_arg_types('join', path, *paths)
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raise
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# Split a path in a drive specification (a drive letter followed by a
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# colon) and the path specification.
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# It is always true that drivespec + pathspec == p
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def splitdrive(p):
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"""Split a pathname into drive/UNC sharepoint and relative path specifiers.
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Returns a 2-tuple (drive_or_unc, path); either part may be empty.
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If you assign
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result = splitdrive(p)
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It is always true that:
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result[0] + result[1] == p
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If the path contained a drive letter, drive_or_unc will contain everything
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up to and including the colon. e.g. splitdrive("c:/dir") returns ("c:", "/dir")
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If the path contained a UNC path, the drive_or_unc will contain the host name
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and share up to but not including the fourth directory separator character.
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e.g. splitdrive("//host/computer/dir") returns ("//host/computer", "/dir")
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Paths cannot contain both a drive letter and a UNC path.
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"""
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p = os.fspath(p)
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if len(p) >= 2:
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if isinstance(p, bytes):
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sep = b'\\'
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altsep = b'/'
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colon = b':'
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else:
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sep = '\\'
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altsep = '/'
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colon = ':'
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normp = p.replace(altsep, sep)
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if (normp[0:2] == sep*2) and (normp[2:3] != sep):
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# is a UNC path:
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# vvvvvvvvvvvvvvvvvvvv drive letter or UNC path
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# \\machine\mountpoint\directory\etc\...
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# directory ^^^^^^^^^^^^^^^
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index = normp.find(sep, 2)
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if index == -1:
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return p[:0], p
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index2 = normp.find(sep, index + 1)
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# a UNC path can't have two slashes in a row
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# (after the initial two)
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if index2 == index + 1:
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return p[:0], p
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if index2 == -1:
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index2 = len(p)
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return p[:index2], p[index2:]
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if normp[1:2] == colon:
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return p[:2], p[2:]
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return p[:0], p
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# Split a path in head (everything up to the last '/') and tail (the
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# rest). After the trailing '/' is stripped, the invariant
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# join(head, tail) == p holds.
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# The resulting head won't end in '/' unless it is the root.
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def split(p):
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"""Split a pathname.
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Return tuple (head, tail) where tail is everything after the final slash.
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Either part may be empty."""
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p = os.fspath(p)
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seps = _get_bothseps(p)
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d, p = splitdrive(p)
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# set i to index beyond p's last slash
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i = len(p)
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while i and p[i-1] not in seps:
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i -= 1
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head, tail = p[:i], p[i:] # now tail has no slashes
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# remove trailing slashes from head, unless it's all slashes
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head = head.rstrip(seps) or head
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return d + head, tail
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# Split a path in root and extension.
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# The extension is everything starting at the last dot in the last
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# pathname component; the root is everything before that.
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# It is always true that root + ext == p.
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def splitext(p):
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p = os.fspath(p)
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if isinstance(p, bytes):
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return genericpath._splitext(p, b'\\', b'/', b'.')
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else:
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return genericpath._splitext(p, '\\', '/', '.')
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splitext.__doc__ = genericpath._splitext.__doc__
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# Return the tail (basename) part of a path.
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def basename(p):
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"""Returns the final component of a pathname"""
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return split(p)[1]
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# Return the head (dirname) part of a path.
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def dirname(p):
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"""Returns the directory component of a pathname"""
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return split(p)[0]
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# Is a path a symbolic link?
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# This will always return false on systems where os.lstat doesn't exist.
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def islink(path):
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"""Test whether a path is a symbolic link.
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This will always return false for Windows prior to 6.0.
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"""
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try:
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st = os.lstat(path)
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except (OSError, ValueError, AttributeError):
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return False
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return stat.S_ISLNK(st.st_mode)
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# Being true for dangling symbolic links is also useful.
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def lexists(path):
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"""Test whether a path exists. Returns True for broken symbolic links"""
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try:
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st = os.lstat(path)
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except (OSError, ValueError):
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return False
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return True
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# Is a path a mount point?
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# Any drive letter root (eg c:\)
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# Any share UNC (eg \\server\share)
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# Any volume mounted on a filesystem folder
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#
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# No one method detects all three situations. Historically we've lexically
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# detected drive letter roots and share UNCs. The canonical approach to
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# detecting mounted volumes (querying the reparse tag) fails for the most
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# common case: drive letter roots. The alternative which uses GetVolumePathName
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# fails if the drive letter is the result of a SUBST.
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try:
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from nt import _getvolumepathname
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except ImportError:
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_getvolumepathname = None
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def ismount(path):
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"""Test whether a path is a mount point (a drive root, the root of a
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share, or a mounted volume)"""
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path = os.fspath(path)
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seps = _get_bothseps(path)
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path = abspath(path)
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root, rest = splitdrive(path)
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if root and root[0] in seps:
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return (not rest) or (rest in seps)
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if rest in seps:
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return True
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if _getvolumepathname:
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return path.rstrip(seps) == _getvolumepathname(path).rstrip(seps)
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else:
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return False
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# Expand paths beginning with '~' or '~user'.
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# '~' means $HOME; '~user' means that user's home directory.
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# If the path doesn't begin with '~', or if the user or $HOME is unknown,
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# the path is returned unchanged (leaving error reporting to whatever
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# function is called with the expanded path as argument).
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# See also module 'glob' for expansion of *, ? and [...] in pathnames.
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# (A function should also be defined to do full *sh-style environment
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# variable expansion.)
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def expanduser(path):
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"""Expand ~ and ~user constructs.
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If user or $HOME is unknown, do nothing."""
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path = os.fspath(path)
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if isinstance(path, bytes):
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tilde = b'~'
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else:
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tilde = '~'
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if not path.startswith(tilde):
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return path
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i, n = 1, len(path)
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while i < n and path[i] not in _get_bothseps(path):
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i += 1
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if 'HOME' in os.environ:
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userhome = os.environ['HOME']
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elif 'USERPROFILE' in os.environ:
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userhome = os.environ['USERPROFILE']
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elif not 'HOMEPATH' in os.environ:
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return path
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else:
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try:
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drive = os.environ['HOMEDRIVE']
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except KeyError:
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drive = ''
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userhome = join(drive, os.environ['HOMEPATH'])
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if isinstance(path, bytes):
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userhome = os.fsencode(userhome)
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if i != 1: #~user
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userhome = join(dirname(userhome), path[1:i])
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return userhome + path[i:]
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# Expand paths containing shell variable substitutions.
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# The following rules apply:
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# - no expansion within single quotes
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# - '$$' is translated into '$'
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# - '%%' is translated into '%' if '%%' are not seen in %var1%%var2%
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# - ${varname} is accepted.
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# - $varname is accepted.
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# - %varname% is accepted.
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# - varnames can be made out of letters, digits and the characters '_-'
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# (though is not verified in the ${varname} and %varname% cases)
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# XXX With COMMAND.COM you can use any characters in a variable name,
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# XXX except '^|<>='.
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def expandvars(path):
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"""Expand shell variables of the forms $var, ${var} and %var%.
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Unknown variables are left unchanged."""
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path = os.fspath(path)
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if isinstance(path, bytes):
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if b'$' not in path and b'%' not in path:
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return path
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import string
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varchars = bytes(string.ascii_letters + string.digits + '_-', 'ascii')
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quote = b'\''
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percent = b'%'
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brace = b'{'
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rbrace = b'}'
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dollar = b'$'
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environ = getattr(os, 'environb', None)
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else:
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if '$' not in path and '%' not in path:
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return path
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import string
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varchars = string.ascii_letters + string.digits + '_-'
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quote = '\''
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percent = '%'
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brace = '{'
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rbrace = '}'
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dollar = '$'
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environ = os.environ
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res = path[:0]
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index = 0
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pathlen = len(path)
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while index < pathlen:
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c = path[index:index+1]
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if c == quote: # no expansion within single quotes
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path = path[index + 1:]
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pathlen = len(path)
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try:
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index = path.index(c)
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res += c + path[:index + 1]
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except ValueError:
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res += c + path
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index = pathlen - 1
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elif c == percent: # variable or '%'
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if path[index + 1:index + 2] == percent:
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res += c
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index += 1
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else:
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path = path[index+1:]
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pathlen = len(path)
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try:
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index = path.index(percent)
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except ValueError:
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res += percent + path
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index = pathlen - 1
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else:
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var = path[:index]
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try:
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if environ is None:
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value = os.fsencode(os.environ[os.fsdecode(var)])
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else:
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value = environ[var]
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except KeyError:
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value = percent + var + percent
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res += value
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elif c == dollar: # variable or '$$'
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if path[index + 1:index + 2] == dollar:
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res += c
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index += 1
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elif path[index + 1:index + 2] == brace:
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path = path[index+2:]
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pathlen = len(path)
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try:
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index = path.index(rbrace)
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except ValueError:
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res += dollar + brace + path
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index = pathlen - 1
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else:
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var = path[:index]
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try:
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if environ is None:
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value = os.fsencode(os.environ[os.fsdecode(var)])
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else:
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value = environ[var]
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except KeyError:
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value = dollar + brace + var + rbrace
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res += value
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else:
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var = path[:0]
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index += 1
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c = path[index:index + 1]
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while c and c in varchars:
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var += c
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index += 1
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c = path[index:index + 1]
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try:
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if environ is None:
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value = os.fsencode(os.environ[os.fsdecode(var)])
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else:
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value = environ[var]
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except KeyError:
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value = dollar + var
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res += value
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if c:
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index -= 1
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else:
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res += c
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index += 1
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return res
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|
|
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# Normalize a path, e.g. A//B, A/./B and A/foo/../B all become A\B.
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|
# Previously, this function also truncated pathnames to 8+3 format,
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# but as this module is called "ntpath", that's obviously wrong!
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|
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def normpath(path):
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"""Normalize path, eliminating double slashes, etc."""
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path = os.fspath(path)
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if isinstance(path, bytes):
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sep = b'\\'
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altsep = b'/'
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curdir = b'.'
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pardir = b'..'
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special_prefixes = (b'\\\\.\\', b'\\\\?\\')
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else:
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sep = '\\'
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altsep = '/'
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curdir = '.'
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pardir = '..'
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special_prefixes = ('\\\\.\\', '\\\\?\\')
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if path.startswith(special_prefixes):
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# in the case of paths with these prefixes:
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# \\.\ -> device names
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# \\?\ -> literal paths
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# do not do any normalization, but return the path unchanged
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return path
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path = path.replace(altsep, sep)
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prefix, path = splitdrive(path)
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|
# collapse initial backslashes
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|
if path.startswith(sep):
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prefix += sep
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path = path.lstrip(sep)
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comps = path.split(sep)
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i = 0
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while i < len(comps):
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if not comps[i] or comps[i] == curdir:
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del comps[i]
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elif comps[i] == pardir:
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if i > 0 and comps[i-1] != pardir:
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del comps[i-1:i+1]
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i -= 1
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elif i == 0 and prefix.endswith(sep):
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del comps[i]
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else:
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i += 1
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else:
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i += 1
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# If the path is now empty, substitute '.'
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if not prefix and not comps:
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comps.append(curdir)
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return prefix + sep.join(comps)
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|
|
def _abspath_fallback(path):
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|
"""Return the absolute version of a path as a fallback function in case
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`nt._getfullpathname` is not available or raises OSError. See bpo-31047 for
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more.
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"""
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|
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path = os.fspath(path)
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if not isabs(path):
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if isinstance(path, bytes):
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cwd = os.getcwdb()
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else:
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cwd = os.getcwd()
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path = join(cwd, path)
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return normpath(path)
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|
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# Return an absolute path.
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|
try:
|
|
from nt import _getfullpathname
|
|
|
|
except ImportError: # not running on Windows - mock up something sensible
|
|
abspath = _abspath_fallback
|
|
|
|
else: # use native Windows method on Windows
|
|
def abspath(path):
|
|
"""Return the absolute version of a path."""
|
|
try:
|
|
return _getfullpathname(path)
|
|
except (OSError, ValueError):
|
|
return _abspath_fallback(path)
|
|
|
|
# realpath is a no-op on systems without islink support
|
|
realpath = abspath
|
|
# Win9x family and earlier have no Unicode filename support.
|
|
supports_unicode_filenames = (hasattr(sys, "getwindowsversion") and
|
|
sys.getwindowsversion()[3] >= 2)
|
|
|
|
def relpath(path, start=None):
|
|
"""Return a relative version of a path"""
|
|
path = os.fspath(path)
|
|
if isinstance(path, bytes):
|
|
sep = b'\\'
|
|
curdir = b'.'
|
|
pardir = b'..'
|
|
else:
|
|
sep = '\\'
|
|
curdir = '.'
|
|
pardir = '..'
|
|
|
|
if start is None:
|
|
start = curdir
|
|
|
|
if not path:
|
|
raise ValueError("no path specified")
|
|
|
|
start = os.fspath(start)
|
|
try:
|
|
start_abs = abspath(normpath(start))
|
|
path_abs = abspath(normpath(path))
|
|
start_drive, start_rest = splitdrive(start_abs)
|
|
path_drive, path_rest = splitdrive(path_abs)
|
|
if normcase(start_drive) != normcase(path_drive):
|
|
raise ValueError("path is on mount %r, start on mount %r" % (
|
|
path_drive, start_drive))
|
|
|
|
start_list = [x for x in start_rest.split(sep) if x]
|
|
path_list = [x for x in path_rest.split(sep) if x]
|
|
# Work out how much of the filepath is shared by start and path.
|
|
i = 0
|
|
for e1, e2 in zip(start_list, path_list):
|
|
if normcase(e1) != normcase(e2):
|
|
break
|
|
i += 1
|
|
|
|
rel_list = [pardir] * (len(start_list)-i) + path_list[i:]
|
|
if not rel_list:
|
|
return curdir
|
|
return join(*rel_list)
|
|
except (TypeError, ValueError, AttributeError, BytesWarning, DeprecationWarning):
|
|
genericpath._check_arg_types('relpath', path, start)
|
|
raise
|
|
|
|
|
|
# Return the longest common sub-path of the sequence of paths given as input.
|
|
# The function is case-insensitive and 'separator-insensitive', i.e. if the
|
|
# only difference between two paths is the use of '\' versus '/' as separator,
|
|
# they are deemed to be equal.
|
|
#
|
|
# However, the returned path will have the standard '\' separator (even if the
|
|
# given paths had the alternative '/' separator) and will have the case of the
|
|
# first path given in the sequence. Additionally, any trailing separator is
|
|
# stripped from the returned path.
|
|
|
|
def commonpath(paths):
|
|
"""Given a sequence of path names, returns the longest common sub-path."""
|
|
|
|
if not paths:
|
|
raise ValueError('commonpath() arg is an empty sequence')
|
|
|
|
paths = tuple(map(os.fspath, paths))
|
|
if isinstance(paths[0], bytes):
|
|
sep = b'\\'
|
|
altsep = b'/'
|
|
curdir = b'.'
|
|
else:
|
|
sep = '\\'
|
|
altsep = '/'
|
|
curdir = '.'
|
|
|
|
try:
|
|
drivesplits = [splitdrive(p.replace(altsep, sep).lower()) for p in paths]
|
|
split_paths = [p.split(sep) for d, p in drivesplits]
|
|
|
|
try:
|
|
isabs, = set(p[:1] == sep for d, p in drivesplits)
|
|
except ValueError:
|
|
raise ValueError("Can't mix absolute and relative paths") from None
|
|
|
|
# Check that all drive letters or UNC paths match. The check is made only
|
|
# now otherwise type errors for mixing strings and bytes would not be
|
|
# caught.
|
|
if len(set(d for d, p in drivesplits)) != 1:
|
|
raise ValueError("Paths don't have the same drive")
|
|
|
|
drive, path = splitdrive(paths[0].replace(altsep, sep))
|
|
common = path.split(sep)
|
|
common = [c for c in common if c and c != curdir]
|
|
|
|
split_paths = [[c for c in s if c and c != curdir] for s in split_paths]
|
|
s1 = min(split_paths)
|
|
s2 = max(split_paths)
|
|
for i, c in enumerate(s1):
|
|
if c != s2[i]:
|
|
common = common[:i]
|
|
break
|
|
else:
|
|
common = common[:len(s1)]
|
|
|
|
prefix = drive + sep if isabs else drive
|
|
return prefix + sep.join(common)
|
|
except (TypeError, AttributeError):
|
|
genericpath._check_arg_types('commonpath', *paths)
|
|
raise
|
|
|
|
|
|
# determine if two files are in fact the same file
|
|
try:
|
|
# GetFinalPathNameByHandle is available starting with Windows 6.0.
|
|
# Windows XP and non-Windows OS'es will mock _getfinalpathname.
|
|
if sys.getwindowsversion()[:2] >= (6, 0):
|
|
from nt import _getfinalpathname
|
|
else:
|
|
raise ImportError
|
|
except (AttributeError, ImportError):
|
|
# On Windows XP and earlier, two files are the same if their absolute
|
|
# pathnames are the same.
|
|
# Non-Windows operating systems fake this method with an XP
|
|
# approximation.
|
|
def _getfinalpathname(f):
|
|
return normcase(abspath(f))
|
|
|
|
|
|
try:
|
|
# The genericpath.isdir implementation uses os.stat and checks the mode
|
|
# attribute to tell whether or not the path is a directory.
|
|
# This is overkill on Windows - just pass the path to GetFileAttributes
|
|
# and check the attribute from there.
|
|
from nt import _isdir as isdir
|
|
except ImportError:
|
|
# Use genericpath.isdir as imported above.
|
|
pass
|