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"""This is an experiment to see how often ftok() returns duplicate keys for
different filenames.
"""
import sys
import os
import sysv_ipc
if len(sys.argv) == 2:
start_path = sys.argv[1]
else:
msg = "Start path? [Default = your home directory] "
start_path = raw_input(msg)
if not start_path:
start_path = "~"
# Expand paths that start with a tilde and then absolutize.
start_path = os.path.expanduser(start_path)
start_path = os.path.abspath(start_path)
# For every filename in the tree, generate a key and associate the filename
# with that key via a dictionary.
d = { }
nfilenames = 0
for path, dirnames, filenames in os.walk(start_path):
for filename in filenames:
# Fully qualify the path
filename = os.path.join(path, filename)
nfilenames += 1
#print "Processing %s..." % filename
key = sysv_ipc.ftok(filename, 42, True)
if key not in d:
d[key] = [ ]
d[key].append(filename)
# Print statistics, including files with non-unique keys.
ndups = 0
for key in d:
if len(d[key]) > 1:
ndups += len(d[key])
print key, d[key]
print "Out of {0} unique filenames, I found {1} duplicate keys.".format(nfilenames, ndups)
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