os.path.vnormpath

[Ben Allfree]

Written to normalize web server path names based on a virtual root. I
propose that something equivalent to this be added to os.path
-------------------------------------
import os.path
import copy

def vnormpath(root,path):
    """
    Normalize a path based on a virtual root.
    """
    r = copy.deepcopy(root)
    p = copy.deepcopy(path)

    if os.path.isabs(path):
        return root + path
    while os.path.commonprefix([root, os.path.normpath(os.path.join(r,p))])
<> root:
        r = os.path.join(r,"junk")
    return os.path.normpath(os.path.join(r,p))


if __name__ == "__main__":
    print vnormpath("C:\\foo\\baz",
"..\\..\\..\\..\\foo\\baz\\..\\..\\..\\frob\\glop")