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#!/usr/bin/python
#
# Find duplicate files and do something with them.
# Copyright 2010 Lars Wirzenius
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import hashlib
import optparse
import os
import sys
import time
class ProgressReporter(object):
def __init__(self, do_report):
self.written = ''
self.when = 0
self.do_report = do_report
def write(self, msg):
if self.do_report and time.time() - self.when >= 1:
sys.stdout.flush()
sys.stderr.write('\b \b' * len(self.written))
msg = msg[:79] # FIXME: use real screen width
sys.stderr.write(msg)
sys.stderr.flush()
self.written = msg
self.when = time.time()
def finished(self):
self.write('')
class DuplicateFileFinder(object):
def __init__(self, progress):
self.by_size = dict()
self.progress = progress
def collect(self, root):
for dirname, subdirs, filenames in os.walk(root):
self.progress.write(dirname)
subdirs.sort()
pathnames = [os.path.join(dirname, f) for f in filenames]
for pathname in pathnames:
stat = os.stat(pathname)
if stat.st_size in self.by_size:
dev, ino, pathnames = self.by_size[stat.st_size]
if stat.st_dev != dev or stat.st_ino != ino:
pathnames.add(pathname)
else:
self.by_size[stat.st_size] = (stat.st_dev, stat.st_ino,
set([pathname]))
self.progress.finished()
def duplicates(self):
for dev, ino, pathnames in self.by_size.itervalues():
by_checksum = dict()
for pathname in pathnames:
checksum = self.file_checksum(pathname)
if checksum not in by_checksum:
by_checksum[checksum] = set()
by_checksum[checksum].add(pathname)
for names in by_checksum.itervalues():
if len(names) > 1:
yield names
def file_checksum(self, pathname):
return hashlib.md5(file(pathname, 'rb').read()).digest()
def make_hardlinks(duplicates):
canonical = duplicates.pop()
for pathname in duplicates:
os.remove(pathname)
os.link(canonical, pathname)
def report(duplicates):
sys.stdout.write('\n'.join(duplicates))
sys.stdout.write('\n\n')
def main():
parser = optparse.OptionParser()
parser.add_option('--make-hardlinks', action='store_true',
help='hardlink duplicate files to each other')
parser.add_option('--progress', action='store_true',
help='report progress')
opts, args = parser.parse_args()
progress = ProgressReporter(opts.progress)
dupfinder = DuplicateFileFinder(progress)
for dirname in sorted(args):
dupfinder.collect(dirname)
for duplicates in dupfinder.duplicates():
if opts.make_hardlinks:
make_hardlinks(duplicates)
else:
report(duplicates)
if __name__ == '__main__':
main()
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