551 lines
19 KiB
Python
551 lines
19 KiB
Python
|
# Module 'ntpath' -- common operations on WinNT/Win95 pathnames
|
||
|
|
"""Common pathname manipulations, WindowsNT/95 version.
|
||
|
|
|
||
|
|
Instead of importing this module directly, import os and refer to this
|
||
|
|
module as os.path.
|
||
|
|
"""
|
||
|
|
|
||
|
|
import os
|
||
|
|
import sys
|
||
|
|
import stat
|
||
|
|
import genericpath
|
||
|
|
import warnings
|
||
|
|
|
||
|
|
from genericpath import *
|
||
|
|
from genericpath import _unicode
|
||
|
|
|
||
|
|
__all__ = ["normcase","isabs","join","splitdrive","split","splitext",
|
||
|
|
"basename","dirname","commonprefix","getsize","getmtime",
|
||
|
|
"getatime","getctime", "islink","exists","lexists","isdir","isfile",
|
||
|
|
"ismount","walk","expanduser","expandvars","normpath","abspath",
|
||
|
|
"splitunc","curdir","pardir","sep","pathsep","defpath","altsep",
|
||
|
|
"extsep","devnull","realpath","supports_unicode_filenames","relpath"]
|
||
|
|
|
||
|
|
# strings representing various path-related bits and pieces
|
||
|
|
curdir = '.'
|
||
|
|
pardir = '..'
|
||
|
|
extsep = '.'
|
||
|
|
sep = '\\'
|
||
|
|
pathsep = ';'
|
||
|
|
altsep = '/'
|
||
|
|
defpath = '.;C:\\bin'
|
||
|
|
if 'ce' in sys.builtin_module_names:
|
||
|
|
defpath = '\\Windows'
|
||
|
|
elif 'os2' in sys.builtin_module_names:
|
||
|
|
# OS/2 w/ VACPP
|
||
|
|
altsep = '/'
|
||
|
|
devnull = 'nul'
|
||
|
|
|
||
|
|
# Normalize the case of a pathname and map slashes to backslashes.
|
||
|
|
# Other normalizations (such as optimizing '../' away) are not done
|
||
|
|
# (this is done by normpath).
|
||
|
|
|
||
|
|
def normcase(s):
|
||
|
|
"""Normalize case of pathname.
|
||
|
|
|
||
|
|
Makes all characters lowercase and all slashes into backslashes."""
|
||
|
|
return s.replace("/", "\\").lower()
|
||
|
|
|
||
|
|
|
||
|
|
# Return whether a path is absolute.
|
||
|
|
# Trivial in Posix, harder on the Mac or MS-DOS.
|
||
|
|
# For DOS it is absolute if it starts with a slash or backslash (current
|
||
|
|
# volume), or if a pathname after the volume letter and colon / UNC resource
|
||
|
|
# starts with a slash or backslash.
|
||
|
|
|
||
|
|
def isabs(s):
|
||
|
|
"""Test whether a path is absolute"""
|
||
|
|
s = splitdrive(s)[1]
|
||
|
|
return s != '' and s[:1] in '/\\'
|
||
|
|
|
||
|
|
|
||
|
|
# Join two (or more) paths.
|
||
|
|
def join(path, *paths):
|
||
|
|
"""Join two or more pathname components, inserting "\\" as needed."""
|
||
|
|
result_drive, result_path = splitdrive(path)
|
||
|
|
for p in paths:
|
||
|
|
p_drive, p_path = splitdrive(p)
|
||
|
|
if p_path and p_path[0] in '\\/':
|
||
|
|
# Second path is absolute
|
||
|
|
if p_drive or not result_drive:
|
||
|
|
result_drive = p_drive
|
||
|
|
result_path = p_path
|
||
|
|
continue
|
||
|
|
elif p_drive and p_drive != result_drive:
|
||
|
|
if p_drive.lower() != result_drive.lower():
|
||
|
|
# Different drives => ignore the first path entirely
|
||
|
|
result_drive = p_drive
|
||
|
|
result_path = p_path
|
||
|
|
continue
|
||
|
|
# Same drive in different case
|
||
|
|
result_drive = p_drive
|
||
|
|
# Second path is relative to the first
|
||
|
|
if result_path and result_path[-1] not in '\\/':
|
||
|
|
result_path = result_path + '\\'
|
||
|
|
result_path = result_path + p_path
|
||
|
|
## add separator between UNC and non-absolute path
|
||
|
|
if (result_path and result_path[0] not in '\\/' and
|
||
|
|
result_drive and result_drive[-1:] != ':'):
|
||
|
|
return result_drive + sep + result_path
|
||
|
|
return result_drive + result_path
|
||
|
|
|
||
|
|
|
||
|
|
# Split a path in a drive specification (a drive letter followed by a
|
||
|
|
# colon) and the path specification.
|
||
|
|
# It is always true that drivespec + pathspec == p
|
||
|
|
def splitdrive(p):
|
||
|
|
"""Split a pathname into drive/UNC sharepoint and relative path specifiers.
|
||
|
|
Returns a 2-tuple (drive_or_unc, path); either part may be empty.
|
||
|
|
|
||
|
|
If you assign
|
||
|
|
result = splitdrive(p)
|
||
|
|
It is always true that:
|
||
|
|
result[0] + result[1] == p
|
||
|
|
|
||
|
|
If the path contained a drive letter, drive_or_unc will contain everything
|
||
|
|
up to and including the colon. e.g. splitdrive("c:/dir") returns ("c:", "/dir")
|
||
|
|
|
||
|
|
If the path contained a UNC path, the drive_or_unc will contain the host name
|
||
|
|
and share up to but not including the fourth directory separator character.
|
||
|
|
e.g. splitdrive("//host/computer/dir") returns ("//host/computer", "/dir")
|
||
|
|
|
||
|
|
Paths cannot contain both a drive letter and a UNC path.
|
||
|
|
|
||
|
|
"""
|
||
|
|
if len(p) > 1:
|
||
|
|
normp = p.replace(altsep, sep)
|
||
|
|
if (normp[0:2] == sep*2) and (normp[2:3] != sep):
|
||
|
|
# is a UNC path:
|
||
|
|
# vvvvvvvvvvvvvvvvvvvv drive letter or UNC path
|
||
|
|
# \\machine\mountpoint\directory\etc\...
|
||
|
|
# directory ^^^^^^^^^^^^^^^
|
||
|
|
index = normp.find(sep, 2)
|
||
|
|
if index == -1:
|
||
|
|
return '', p
|
||
|
|
index2 = normp.find(sep, index + 1)
|
||
|
|
# a UNC path can't have two slashes in a row
|
||
|
|
# (after the initial two)
|
||
|
|
if index2 == index + 1:
|
||
|
|
return '', p
|
||
|
|
if index2 == -1:
|
||
|
|
index2 = len(p)
|
||
|
|
return p[:index2], p[index2:]
|
||
|
|
if normp[1] == ':':
|
||
|
|
return p[:2], p[2:]
|
||
|
|
return '', p
|
||
|
|
|
||
|
|
# Parse UNC paths
|
||
|
|
def splitunc(p):
|
||
|
|
"""Split a pathname into UNC mount point and relative path specifiers.
|
||
|
|
|
||
|
|
Return a 2-tuple (unc, rest); either part may be empty.
|
||
|
|
If unc is not empty, it has the form '//host/mount' (or similar
|
||
|
|
using backslashes). unc+rest is always the input path.
|
||
|
|
Paths containing drive letters never have an UNC part.
|
||
|
|
"""
|
||
|
|
if p[1:2] == ':':
|
||
|
|
return '', p # Drive letter present
|
||
|
|
firstTwo = p[0:2]
|
||
|
|
if firstTwo == '//' or firstTwo == '\\\\':
|
||
|
|
# is a UNC path:
|
||
|
|
# vvvvvvvvvvvvvvvvvvvv equivalent to drive letter
|
||
|
|
# \\machine\mountpoint\directories...
|
||
|
|
# directory ^^^^^^^^^^^^^^^
|
||
|
|
normp = p.replace('\\', '/')
|
||
|
|
index = normp.find('/', 2)
|
||
|
|
if index <= 2:
|
||
|
|
return '', p
|
||
|
|
index2 = normp.find('/', index + 1)
|
||
|
|
# a UNC path can't have two slashes in a row
|
||
|
|
# (after the initial two)
|
||
|
|
if index2 == index + 1:
|
||
|
|
return '', p
|
||
|
|
if index2 == -1:
|
||
|
|
index2 = len(p)
|
||
|
|
return p[:index2], p[index2:]
|
||
|
|
return '', p
|
||
|
|
|
||
|
|
|
||
|
|
# Split a path in head (everything up to the last '/') and tail (the
|
||
|
|
# rest). After the trailing '/' is stripped, the invariant
|
||
|
|
# join(head, tail) == p holds.
|
||
|
|
# The resulting head won't end in '/' unless it is the root.
|
||
|
|
|
||
|
|
def split(p):
|
||
|
|
"""Split a pathname.
|
||
|
|
|
||
|
|
Return tuple (head, tail) where tail is everything after the final slash.
|
||
|
|
Either part may be empty."""
|
||
|
|
|
||
|
|
d, p = splitdrive(p)
|
||
|
|
# set i to index beyond p's last slash
|
||
|
|
i = len(p)
|
||
|
|
while i and p[i-1] not in '/\\':
|
||
|
|
i = i - 1
|
||
|
|
head, tail = p[:i], p[i:] # now tail has no slashes
|
||
|
|
# remove trailing slashes from head, unless it's all slashes
|
||
|
|
head2 = head
|
||
|
|
while head2 and head2[-1] in '/\\':
|
||
|
|
head2 = head2[:-1]
|
||
|
|
head = head2 or head
|
||
|
|
return d + head, tail
|
||
|
|
|
||
|
|
|
||
|
|
# Split a path in root and extension.
|
||
|
|
# The extension is everything starting at the last dot in the last
|
||
|
|
# pathname component; the root is everything before that.
|
||
|
|
# It is always true that root + ext == p.
|
||
|
|
|
||
|
|
def splitext(p):
|
||
|
|
return genericpath._splitext(p, sep, altsep, extsep)
|
||
|
|
splitext.__doc__ = genericpath._splitext.__doc__
|
||
|
|
|
||
|
|
|
||
|
|
# Return the tail (basename) part of a path.
|
||
|
|
|
||
|
|
def basename(p):
|
||
|
|
"""Returns the final component of a pathname"""
|
||
|
|
return split(p)[1]
|
||
|
|
|
||
|
|
|
||
|
|
# Return the head (dirname) part of a path.
|
||
|
|
|
||
|
|
def dirname(p):
|
||
|
|
"""Returns the directory component of a pathname"""
|
||
|
|
return split(p)[0]
|
||
|
|
|
||
|
|
# Is a path a symbolic link?
|
||
|
|
# This will always return false on systems where posix.lstat doesn't exist.
|
||
|
|
|
||
|
|
def islink(path):
|
||
|
|
"""Test for symbolic link.
|
||
|
|
On WindowsNT/95 and OS/2 always returns false
|
||
|
|
"""
|
||
|
|
return False
|
||
|
|
|
||
|
|
# alias exists to lexists
|
||
|
|
lexists = exists
|
||
|
|
|
||
|
|
# Is a path a mount point? Either a root (with or without drive letter)
|
||
|
|
# or an UNC path with at most a / or \ after the mount point.
|
||
|
|
|
||
|
|
def ismount(path):
|
||
|
|
"""Test whether a path is a mount point (defined as root of drive)"""
|
||
|
|
unc, rest = splitunc(path)
|
||
|
|
if unc:
|
||
|
|
return rest in ("", "/", "\\")
|
||
|
|
p = splitdrive(path)[1]
|
||
|
|
return len(p) == 1 and p[0] in '/\\'
|
||
|
|
|
||
|
|
|
||
|
|
# Directory tree walk.
|
||
|
|
# For each directory under top (including top itself, but excluding
|
||
|
|
# '.' and '..'), func(arg, dirname, filenames) is called, where
|
||
|
|
# dirname is the name of the directory and filenames is the list
|
||
|
|
# of files (and subdirectories etc.) in the directory.
|
||
|
|
# The func may modify the filenames list, to implement a filter,
|
||
|
|
# or to impose a different order of visiting.
|
||
|
|
|
||
|
|
def walk(top, func, arg):
|
||
|
|
"""Directory tree walk with callback function.
|
||
|
|
|
||
|
|
For each directory in the directory tree rooted at top (including top
|
||
|
|
itself, but excluding '.' and '..'), call func(arg, dirname, fnames).
|
||
|
|
dirname is the name of the directory, and fnames a list of the names of
|
||
|
|
the files and subdirectories in dirname (excluding '.' and '..'). func
|
||
|
|
may modify the fnames list in-place (e.g. via del or slice assignment),
|
||
|
|
and walk will only recurse into the subdirectories whose names remain in
|
||
|
|
fnames; this can be used to implement a filter, or to impose a specific
|
||
|
|
order of visiting. No semantics are defined for, or required of, arg,
|
||
|
|
beyond that arg is always passed to func. It can be used, e.g., to pass
|
||
|
|
a filename pattern, or a mutable object designed to accumulate
|
||
|
|
statistics. Passing None for arg is common."""
|
||
|
|
warnings.warnpy3k("In 3.x, os.path.walk is removed in favor of os.walk.",
|
||
|
|
stacklevel=2)
|
||
|
|
try:
|
||
|
|
names = os.listdir(top)
|
||
|
|
except os.error:
|
||
|
|
return
|
||
|
|
func(arg, top, names)
|
||
|
|
for name in names:
|
||
|
|
name = join(top, name)
|
||
|
|
if isdir(name):
|
||
|
|
walk(name, func, arg)
|
||
|
|
|
||
|
|
|
||
|
|
# Expand paths beginning with '~' or '~user'.
|
||
|
|
# '~' means $HOME; '~user' means that user's home directory.
|
||
|
|
# If the path doesn't begin with '~', or if the user or $HOME is unknown,
|
||
|
|
# the path is returned unchanged (leaving error reporting to whatever
|
||
|
|
# function is called with the expanded path as argument).
|
||
|
|
# See also module 'glob' for expansion of *, ? and [...] in pathnames.
|
||
|
|
# (A function should also be defined to do full *sh-style environment
|
||
|
|
# variable expansion.)
|
||
|
|
|
||
|
|
def expanduser(path):
|
||
|
|
"""Expand ~ and ~user constructs.
|
||
|
|
|
||
|
|
If user or $HOME is unknown, do nothing."""
|
||
|
|
if path[:1] != '~':
|
||
|
|
return path
|
||
|
|
i, n = 1, len(path)
|
||
|
|
while i < n and path[i] not in '/\\':
|
||
|
|
i = i + 1
|
||
|
|
|
||
|
|
if 'HOME' in os.environ:
|
||
|
|
userhome = os.environ['HOME']
|
||
|
|
elif 'USERPROFILE' in os.environ:
|
||
|
|
userhome = os.environ['USERPROFILE']
|
||
|
|
elif not 'HOMEPATH' in os.environ:
|
||
|
|
return path
|
||
|
|
else:
|
||
|
|
try:
|
||
|
|
drive = os.environ['HOMEDRIVE']
|
||
|
|
except KeyError:
|
||
|
|
drive = ''
|
||
|
|
userhome = join(drive, os.environ['HOMEPATH'])
|
||
|
|
|
||
|
|
if i != 1: #~user
|
||
|
|
userhome = join(dirname(userhome), path[1:i])
|
||
|
|
|
||
|
|
return userhome + path[i:]
|
||
|
|
|
||
|
|
|
||
|
|
# Expand paths containing shell variable substitutions.
|
||
|
|
# The following rules apply:
|
||
|
|
# - no expansion within single quotes
|
||
|
|
# - '$$' is translated into '$'
|
||
|
|
# - '%%' is translated into '%' if '%%' are not seen in %var1%%var2%
|
||
|
|
# - ${varname} is accepted.
|
||
|
|
# - $varname is accepted.
|
||
|
|
# - %varname% is accepted.
|
||
|
|
# - varnames can be made out of letters, digits and the characters '_-'
|
||
|
|
# (though is not verified in the ${varname} and %varname% cases)
|
||
|
|
# XXX With COMMAND.COM you can use any characters in a variable name,
|
||
|
|
# XXX except '^|<>='.
|
||
|
|
|
||
|
|
def expandvars(path):
|
||
|
|
"""Expand shell variables of the forms $var, ${var} and %var%.
|
||
|
|
|
||
|
|
Unknown variables are left unchanged."""
|
||
|
|
if '$' not in path and '%' not in path:
|
||
|
|
return path
|
||
|
|
import string
|
||
|
|
varchars = string.ascii_letters + string.digits + '_-'
|
||
|
|
if isinstance(path, _unicode):
|
||
|
|
encoding = sys.getfilesystemencoding()
|
||
|
|
def getenv(var):
|
||
|
|
return os.environ[var.encode(encoding)].decode(encoding)
|
||
|
|
else:
|
||
|
|
def getenv(var):
|
||
|
|
return os.environ[var]
|
||
|
|
res = ''
|
||
|
|
index = 0
|
||
|
|
pathlen = len(path)
|
||
|
|
while index < pathlen:
|
||
|
|
c = path[index]
|
||
|
|
if c == '\'': # no expansion within single quotes
|
||
|
|
path = path[index + 1:]
|
||
|
|
pathlen = len(path)
|
||
|
|
try:
|
||
|
|
index = path.index('\'')
|
||
|
|
res = res + '\'' + path[:index + 1]
|
||
|
|
except ValueError:
|
||
|
|
res = res + c + path
|
||
|
|
index = pathlen - 1
|
||
|
|
elif c == '%': # variable or '%'
|
||
|
|
if path[index + 1:index + 2] == '%':
|
||
|
|
res = res + c
|
||
|
|
index = index + 1
|
||
|
|
else:
|
||
|
|
path = path[index+1:]
|
||
|
|
pathlen = len(path)
|
||
|
|
try:
|
||
|
|
index = path.index('%')
|
||
|
|
except ValueError:
|
||
|
|
res = res + '%' + path
|
||
|
|
index = pathlen - 1
|
||
|
|
else:
|
||
|
|
var = path[:index]
|
||
|
|
try:
|
||
|
|
res = res + getenv(var)
|
||
|
|
except KeyError:
|
||
|
|
res = res + '%' + var + '%'
|
||
|
|
elif c == '$': # variable or '$$'
|
||
|
|
if path[index + 1:index + 2] == '$':
|
||
|
|
res = res + c
|
||
|
|
index = index + 1
|
||
|
|
elif path[index + 1:index + 2] == '{':
|
||
|
|
path = path[index+2:]
|
||
|
|
pathlen = len(path)
|
||
|
|
try:
|
||
|
|
index = path.index('}')
|
||
|
|
var = path[:index]
|
||
|
|
try:
|
||
|
|
res = res + getenv(var)
|
||
|
|
except KeyError:
|
||
|
|
res = res + '${' + var + '}'
|
||
|
|
except ValueError:
|
||
|
|
res = res + '${' + path
|
||
|
|
index = pathlen - 1
|
||
|
|
else:
|
||
|
|
var = ''
|
||
|
|
index = index + 1
|
||
|
|
c = path[index:index + 1]
|
||
|
|
while c != '' and c in varchars:
|
||
|
|
var = var + c
|
||
|
|
index = index + 1
|
||
|
|
c = path[index:index + 1]
|
||
|
|
try:
|
||
|
|
res = res + getenv(var)
|
||
|
|
except KeyError:
|
||
|
|
res = res + '$' + var
|
||
|
|
if c != '':
|
||
|
|
index = index - 1
|
||
|
|
else:
|
||
|
|
res = res + c
|
||
|
|
index = index + 1
|
||
|
|
return res
|
||
|
|
|
||
|
|
|
||
|
|
# Normalize a path, e.g. A//B, A/./B and A/foo/../B all become A\B.
|
||
|
|
# Previously, this function also truncated pathnames to 8+3 format,
|
||
|
|
# but as this module is called "ntpath", that's obviously wrong!
|
||
|
|
|
||
|
|
def normpath(path):
|
||
|
|
"""Normalize path, eliminating double slashes, etc."""
|
||
|
|
# Preserve unicode (if path is unicode)
|
||
|
|
backslash, dot = (u'\\', u'.') if isinstance(path, _unicode) else ('\\', '.')
|
||
|
|
if path.startswith(('\\\\.\\', '\\\\?\\')):
|
||
|
|
# in the case of paths with these prefixes:
|
||
|
|
# \\.\ -> device names
|
||
|
|
# \\?\ -> literal paths
|
||
|
|
# do not do any normalization, but return the path unchanged
|
||
|
|
return path
|
||
|
|
path = path.replace("/", "\\")
|
||
|
|
prefix, path = splitdrive(path)
|
||
|
|
# We need to be careful here. If the prefix is empty, and the path starts
|
||
|
|
# with a backslash, it could either be an absolute path on the current
|
||
|
|
# drive (\dir1\dir2\file) or a UNC filename (\\server\mount\dir1\file). It
|
||
|
|
# is therefore imperative NOT to collapse multiple backslashes blindly in
|
||
|
|
# that case.
|
||
|
|
# The code below preserves multiple backslashes when there is no drive
|
||
|
|
# letter. This means that the invalid filename \\\a\b is preserved
|
||
|
|
# unchanged, where a\\\b is normalised to a\b. It's not clear that there
|
||
|
|
# is any better behaviour for such edge cases.
|
||
|
|
if prefix == '':
|
||
|
|
# No drive letter - preserve initial backslashes
|
||
|
|
while path[:1] == "\\":
|
||
|
|
prefix = prefix + backslash
|
||
|
|
path = path[1:]
|
||
|
|
else:
|
||
|
|
# We have a drive letter - collapse initial backslashes
|
||
|
|
if path.startswith("\\"):
|
||
|
|
prefix = prefix + backslash
|
||
|
|
path = path.lstrip("\\")
|
||
|
|
comps = path.split("\\")
|
||
|
|
i = 0
|
||
|
|
while i < len(comps):
|
||
|
|
if comps[i] in ('.', ''):
|
||
|
|
del comps[i]
|
||
|
|
elif comps[i] == '..':
|
||
|
|
if i > 0 and comps[i-1] != '..':
|
||
|
|
del comps[i-1:i+1]
|
||
|
|
i -= 1
|
||
|
|
elif i == 0 and prefix.endswith("\\"):
|
||
|
|
del comps[i]
|
||
|
|
else:
|
||
|
|
i += 1
|
||
|
|
else:
|
||
|
|
i += 1
|
||
|
|
# If the path is now empty, substitute '.'
|
||
|
|
if not prefix and not comps:
|
||
|
|
comps.append(dot)
|
||
|
|
return prefix + backslash.join(comps)
|
||
|
|
|
||
|
|
|
||
|
|
# Return an absolute path.
|
||
|
|
try:
|
||
|
|
from nt import _getfullpathname
|
||
|
|
|
||
|
|
except ImportError: # not running on Windows - mock up something sensible
|
||
|
|
def abspath(path):
|
||
|
|
"""Return the absolute version of a path."""
|
||
|
|
if not isabs(path):
|
||
|
|
if isinstance(path, _unicode):
|
||
|
|
cwd = os.getcwdu()
|
||
|
|
else:
|
||
|
|
cwd = os.getcwd()
|
||
|
|
path = join(cwd, path)
|
||
|
|
return normpath(path)
|
||
|
|
|
||
|
|
else: # use native Windows method on Windows
|
||
|
|
def abspath(path):
|
||
|
|
"""Return the absolute version of a path."""
|
||
|
|
|
||
|
|
if path: # Empty path must return current working directory.
|
||
|
|
try:
|
||
|
|
path = _getfullpathname(path)
|
||
|
|
except WindowsError:
|
||
|
|
pass # Bad path - return unchanged.
|
||
|
|
elif isinstance(path, _unicode):
|
||
|
|
path = os.getcwdu()
|
||
|
|
else:
|
||
|
|
path = os.getcwd()
|
||
|
|
return normpath(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 _abspath_split(path):
|
||
|
|
abs = abspath(normpath(path))
|
||
|
|
prefix, rest = splitunc(abs)
|
||
|
|
is_unc = bool(prefix)
|
||
|
|
if not is_unc:
|
||
|
|
prefix, rest = splitdrive(abs)
|
||
|
|
return is_unc, prefix, [x for x in rest.split(sep) if x]
|
||
|
|
|
||
|
|
def relpath(path, start=curdir):
|
||
|
|
"""Return a relative version of a path"""
|
||
|
|
|
||
|
|
if not path:
|
||
|
|
raise ValueError("no path specified")
|
||
|
|
|
||
|
|
start_is_unc, start_prefix, start_list = _abspath_split(start)
|
||
|
|
path_is_unc, path_prefix, path_list = _abspath_split(path)
|
||
|
|
|
||
|
|
if path_is_unc ^ start_is_unc:
|
||
|
|
raise ValueError("Cannot mix UNC and non-UNC paths (%s and %s)"
|
||
|
|
% (path, start))
|
||
|
|
if path_prefix.lower() != start_prefix.lower():
|
||
|
|
if path_is_unc:
|
||
|
|
raise ValueError("path is on UNC root %s, start on UNC root %s"
|
||
|
|
% (path_prefix, start_prefix))
|
||
|
|
else:
|
||
|
|
raise ValueError("path is on drive %s, start on drive %s"
|
||
|
|
% (path_prefix, start_prefix))
|
||
|
|
# 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 e1.lower() != e2.lower():
|
||
|
|
break
|
||
|
|
i += 1
|
||
|
|
|
||
|
|
rel_list = [pardir] * (len(start_list)-i) + path_list[i:]
|
||
|
|
if not rel_list:
|
||
|
|
return curdir
|
||
|
|
return join(*rel_list)
|
||
|
|
|
||
|
|
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
|