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# Lib/posixpath.py of cpython
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import os


def ismount(path):
    """Test whether a path is a mount point
    clone of os.path.ismount (from cpython Lib/posixpath.py)
    fixed to solve https://github.com/ansible/ansible-modules-core/issues/2186
    and workaround non-fixed http://bugs.python.org/issue2466
    this should be rewritten as soon as python issue 2466 is fixed
    probably check for python version and use os.path.ismount if fixed

    to remove replace in this file ismount( -> os.path.ismount( and remove this
    function"""

    try:
        s1 = os.lstat(path)
    except OSError:
        # the OSError should be handled with more care
        # it could be a "permission denied" but path is still a mount
        return False
    else:
        # A symlink can never be a mount point
        if os.stat.S_ISLNK(s1.st_mode):
            return False

    parent = os.path.join(path, os.path.pardir)
    parent = os.path.realpath(parent)

    try:
        s2 = os.lstat(parent)
    except OSError:
        # one should handle the returned OSError with more care to figure
        # out whether this is still a mount
        return False

    if s1.st_dev != s2.st_dev:
        return True     # path/.. on a different device as path
    if s1.st_ino == s2.st_ino:
        return True     # path/.. is the same i-node as path, i.e. path=='/'
    return False

add ismount function from python Lib/posixpath.py