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diff --git a/lib/python2.7/posixpath.py b/lib/python2.7/posixpath.py
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+"""Common operations on Posix pathnames.
+
+Instead of importing this module directly, import os and refer to
+this module as os.path.  The "os.path" name is an alias for this
+module on Posix systems; on other systems (e.g. Mac, Windows),
+os.path provides the same operations in a manner specific to that
+platform, and is an alias to another module (e.g. macpath, ntpath).
+
+Some of this can actually be useful on non-Posix systems too, e.g.
+for manipulation of the pathname component of URLs.
+"""
+
+import os
+import sys
+import stat
+import genericpath
+import warnings
+from genericpath import *
+
+try:
+    _unicode = unicode
+except NameError:
+    # If Python is built without Unicode support, the unicode type
+    # will not exist. Fake one.
+    class _unicode(object):
+        pass
+
+__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",
+           "samefile","sameopenfile","samestat",
+           "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 = ':'
+defpath = ':/bin:/usr/bin'
+altsep = None
+devnull = '/dev/null'
+
+# Normalize the case of a pathname.  Trivial in Posix, string.lower on Mac.
+# On MS-DOS this may also turn slashes into backslashes; however, other
+# normalizations (such as optimizing '../' away) are not allowed
+# (another function should be defined to do that).
+
+def normcase(s):
+    """Normalize case of pathname.  Has no effect under Posix"""
+    return s
+
+
+# Return whether a path is absolute.
+# Trivial in Posix, harder on the Mac or MS-DOS.
+
+def isabs(s):
+    """Test whether a path is absolute"""
+    return s.startswith('/')
+
+
+# Join pathnames.
+# Ignore the previous parts if a part is absolute.
+# Insert a '/' unless the first part is empty or already ends in '/'.
+
+def join(a, *p):
+    """Join two or more pathname components, inserting '/' as needed.
+    If any component is an absolute path, all previous path components
+    will be discarded.  An empty last part will result in a path that
+    ends with a separator."""
+    path = a
+    for b in p:
+        if b.startswith('/'):
+            path = b
+        elif path == '' or path.endswith('/'):
+            path +=  b
+        else:
+            path += '/' + b
+    return path
+
+
+# Split a path in head (everything up to the last '/') and tail (the
+# rest).  If the path ends in '/', tail will be empty.  If there is no
+# '/' in the path, head  will be empty.
+# Trailing '/'es are stripped from head unless it is the root.
+
+def split(p):
+    """Split a pathname.  Returns tuple "(head, tail)" where "tail" is
+    everything after the final slash.  Either part may be empty."""
+    i = p.rfind('/') + 1
+    head, tail = p[:i], p[i:]
+    if head and head != '/'*len(head):
+        head = head.rstrip('/')
+    return 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__
+
+# Split a pathname into a drive specification and the rest of the
+# path.  Useful on DOS/Windows/NT; on Unix, the drive is always empty.
+
+def splitdrive(p):
+    """Split a pathname into drive and path. On Posix, drive is always
+    empty."""
+    return '', p
+
+
+# Return the tail (basename) part of a path, same as split(path)[1].
+
+def basename(p):
+    """Returns the final component of a pathname"""
+    i = p.rfind('/') + 1
+    return p[i:]
+
+
+# Return the head (dirname) part of a path, same as split(path)[0].
+
+def dirname(p):
+    """Returns the directory component of a pathname"""
+    i = p.rfind('/') + 1
+    head = p[:i]
+    if head and head != '/'*len(head):
+        head = head.rstrip('/')
+    return head
+
+
+# Is a path a symbolic link?
+# This will always return false on systems where os.lstat doesn't exist.
+
+def islink(path):
+    """Test whether a path is a symbolic link"""
+    try:
+        st = os.lstat(path)
+    except (os.error, AttributeError):
+        return False
+    return stat.S_ISLNK(st.st_mode)
+
+# Being true for dangling symbolic links is also useful.
+
+def lexists(path):
+    """Test whether a path exists.  Returns True for broken symbolic links"""
+    try:
+        os.lstat(path)
+    except os.error:
+        return False
+    return True
+
+
+# Are two filenames really pointing to the same file?
+
+def samefile(f1, f2):
+    """Test whether two pathnames reference the same actual file"""
+    s1 = os.stat(f1)
+    s2 = os.stat(f2)
+    return samestat(s1, s2)
+
+
+# Are two open files really referencing the same file?
+# (Not necessarily the same file descriptor!)
+
+def sameopenfile(fp1, fp2):
+    """Test whether two open file objects reference the same file"""
+    s1 = os.fstat(fp1)
+    s2 = os.fstat(fp2)
+    return samestat(s1, s2)
+
+
+# Are two stat buffers (obtained from stat, fstat or lstat)
+# describing the same file?
+
+def samestat(s1, s2):
+    """Test whether two stat buffers reference the same file"""
+    return s1.st_ino == s2.st_ino and \
+           s1.st_dev == s2.st_dev
+
+
+# Is a path a mount point?
+# (Does this work for all UNIXes?  Is it even guaranteed to work by Posix?)
+
+def ismount(path):
+    """Test whether a path is a mount point"""
+    if islink(path):
+        # A symlink can never be a mount point
+        return False
+    try:
+        s1 = os.lstat(path)
+        s2 = os.lstat(join(path, '..'))
+    except os.error:
+        return False # It doesn't exist -- so not a mount point :-)
+    dev1 = s1.st_dev
+    dev2 = s2.st_dev
+    if dev1 != dev2:
+        return True     # path/.. on a different device as path
+    ino1 = s1.st_ino
+    ino2 = s2.st_ino
+    if ino1 == ino2:
+        return True     # path/.. is the same i-node as path
+    return False
+
+
+# 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)
+        try:
+            st = os.lstat(name)
+        except os.error:
+            continue
+        if stat.S_ISDIR(st.st_mode):
+            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 constructions.  If user or $HOME is unknown,
+    do nothing."""
+    if not path.startswith('~'):
+        return path
+    i = path.find('/', 1)
+    if i < 0:
+        i = len(path)
+    if i == 1:
+        if 'HOME' not in os.environ:
+            import pwd
+            userhome = pwd.getpwuid(os.getuid()).pw_dir
+        else:
+            userhome = os.environ['HOME']
+    else:
+        import pwd
+        try:
+            pwent = pwd.getpwnam(path[1:i])
+        except KeyError:
+            return path
+        userhome = pwent.pw_dir
+    userhome = userhome.rstrip('/')
+    return (userhome + path[i:]) or '/'
+
+
+# Expand paths containing shell variable substitutions.
+# This expands the forms $variable and ${variable} only.
+# Non-existent variables are left unchanged.
+
+_varprog = None
+
+def expandvars(path):
+    """Expand shell variables of form $var and ${var}.  Unknown variables
+    are left unchanged."""
+    global _varprog
+    if '$' not in path:
+        return path
+    if not _varprog:
+        import re
+        _varprog = re.compile(r'\$(\w+|\{[^}]*\})')
+    i = 0
+    while True:
+        m = _varprog.search(path, i)
+        if not m:
+            break
+        i, j = m.span(0)
+        name = m.group(1)
+        if name.startswith('{') and name.endswith('}'):
+            name = name[1:-1]
+        if name in os.environ:
+            tail = path[j:]
+            path = path[:i] + os.environ[name]
+            i = len(path)
+            path += tail
+        else:
+            i = j
+    return path
+
+
+# Normalize a path, e.g. A//B, A/./B and A/foo/../B all become A/B.
+# It should be understood that this may change the meaning of the path
+# if it contains symbolic links!
+
+def normpath(path):
+    """Normalize path, eliminating double slashes, etc."""
+    # Preserve unicode (if path is unicode)
+    slash, dot = (u'/', u'.') if isinstance(path, _unicode) else ('/', '.')
+    if path == '':
+        return dot
+    initial_slashes = path.startswith('/')
+    # POSIX allows one or two initial slashes, but treats three or more
+    # as single slash.
+    if (initial_slashes and
+        path.startswith('//') and not path.startswith('///')):
+        initial_slashes = 2
+    comps = path.split('/')
+    new_comps = []
+    for comp in comps:
+        if comp in ('', '.'):
+            continue
+        if (comp != '..' or (not initial_slashes and not new_comps) or
+             (new_comps and new_comps[-1] == '..')):
+            new_comps.append(comp)
+        elif new_comps:
+            new_comps.pop()
+    comps = new_comps
+    path = slash.join(comps)
+    if initial_slashes:
+        path = slash*initial_slashes + path
+    return path or dot
+
+
+def abspath(path):
+    """Return an absolute path."""
+    if not isabs(path):
+        if isinstance(path, _unicode):
+            cwd = os.getcwdu()
+        else:
+            cwd = os.getcwd()
+        path = join(cwd, path)
+    return normpath(path)
+
+
+# Return a canonical path (i.e. the absolute location of a file on the
+# filesystem).
+
+def realpath(filename):
+    """Return the canonical path of the specified filename, eliminating any
+symbolic links encountered in the path."""
+    path, ok = _joinrealpath('', filename, {})
+    return abspath(path)
+
+# Join two paths, normalizing ang eliminating any symbolic links
+# encountered in the second path.
+def _joinrealpath(path, rest, seen):
+    if isabs(rest):
+        rest = rest[1:]
+        path = sep
+
+    while rest:
+        name, _, rest = rest.partition(sep)
+        if not name or name == curdir:
+            # current dir
+            continue
+        if name == pardir:
+            # parent dir
+            if path:
+                path, name = split(path)
+                if name == pardir:
+                    path = join(path, pardir, pardir)
+            else:
+                path = pardir
+            continue
+        newpath = join(path, name)
+        if not islink(newpath):
+            path = newpath
+            continue
+        # Resolve the symbolic link
+        if newpath in seen:
+            # Already seen this path
+            path = seen[newpath]
+            if path is not None:
+                # use cached value
+                continue
+            # The symlink is not resolved, so we must have a symlink loop.
+            # Return already resolved part + rest of the path unchanged.
+            return join(newpath, rest), False
+        seen[newpath] = None # not resolved symlink
+        path, ok = _joinrealpath(path, os.readlink(newpath), seen)
+        if not ok:
+            return join(path, rest), False
+        seen[newpath] = path # resolved symlink
+
+    return path, True
+
+
+supports_unicode_filenames = (sys.platform == 'darwin')
+
+def relpath(path, start=curdir):
+    """Return a relative version of a path"""
+
+    if not path:
+        raise ValueError("no path specified")
+
+    start_list = [x for x in abspath(start).split(sep) if x]
+    path_list = [x for x in abspath(path).split(sep) if x]
+
+    # Work out how much of the filepath is shared by start and path.
+    i = len(commonprefix([start_list, path_list]))
+
+    rel_list = [pardir] * (len(start_list)-i) + path_list[i:]
+    if not rel_list:
+        return curdir
+    return join(*rel_list)