670 lines
22 KiB
Python
670 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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# 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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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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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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# Return an absolute path.
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try:
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from nt import _getfullpathname
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except ImportError: # not running on Windows - mock up something sensible
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abspath = _abspath_fallback
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else: # use native Windows method on Windows
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def abspath(path):
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"""Return the absolute version of a path."""
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try:
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|
return normpath(_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
|