fixed directory scanner thing

import os, stat

def flat_walk(root):
    """Look at a single level of the filesystem and return
    a os.walk-style tuple listing subdirectories and individual files
    in root. Also includes a realpath() on starting path
    because why the hell not.
    """
    inodes = os.listdir(root)
    dirs = []
    files = []
    for inode in inodes:
        nodestat = os.stat(os.path.join(root, inode))
        if stat.S_ISDIR(nodestat.st_mode):
            dirs.append(inode)
        else:
            files.append(inode)
    return os.path.realpath(root), dirs, files

def build_filesystem(root):
    """Build a dictionary which contains the filesystem structure from a
    given starting path root.
    """
    dirdict = {}
    path, dirs, files = flat_walk(root)
    for subdir in dirs:
        dirdict[subdir] = build_filesystem(os.path.join(path, subdir))
    for leaf in files:
        dirdict[leaf] = os.path.join(path, leaf)
    return dirdict