#!/usr/bin/env python

import re, sys, os
from stat import *
import getpass, grp


def usage():
    usage_str = "Usage: " + sys.argv[0] + """<dir>
  Looks up each file and subdirectory under <dir>
 owned by the user, and changes its mode to world readable.
 If the file is executable, then the file/directory will also
be made executable.
"""
    sys.stderr.write(usage_str)
    sys.exit(1)


def publ_access(path, uid, prefix):
    """Make public the directory tree under path.
    prefix helps in displaying the tree during the recursive calls."""

    print prefix, os.path.basename(path)
    
    try:
        stat_return = os.lstat(path) 
    except OSError, detail:
        print >> sys.stderr, "lstat ", path, " failed: ", \
              detail.strerror, "\n"
        return

    if uid == stat_return[ST_UID]:
        mode = stat_return[ST_MODE]
        executable = mode & 0100
        if os.path.isdir(path) or executable:     # or # if ST_ISDIR(mode):
            newmode = mode | 0555
        else:
            newmode = mode | 0444
        try:
            os.chmod(path, newmode)
        except OSError, detail:
            sys.stderr.write("chmod " + path + " failed: " +
                             detail.strerror + "\n")
            return
                
    if os.path.isdir(path):
        for file in os.listdir(path):
            publ_access(os.path.join(path, file), uid, prefix + "  ")

"main"

argc = len(sys.argv)
if 2 < argc : usage()

uid = os.getuid()
path = sys.argv[1]

publ_access(path, uid, "")