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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.when = 0
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.lstat(pathname)
t = (stat.st_dev, stat.st_ino, pathname)
if stat.st_size in self.by_size:
self.by_size[stat.st_size].append(t)
else:
self.by_size[stat.st_size] = [t]
self.progress.finished()
# FIXME: This computed the checksum for each file, the full file.
# It might be faster to read all files (of the same size) in parallel,
# in suitably small chunks, and compute checksums for all of them in
# parallel. When checksums diverge, split the files into smaller
# groups. If a group becomes just a single file, that file is not
# a duplicate and can be dropped completely.
def duplicates(self):
skip = [size for size in self.by_size if len(self.by_size[size]) == 1]
for size in skip:
del self.by_size[size]
total_bytes = sum(len(tuples) * size
for size, tuples in self.by_size.iteritems())
done_bytes = 0
start_time = time.time()
result = []
for size, tuples in self.by_size.iteritems():
by_checksum = dict()
for dev, ino, pathname in tuples:
checksum = self.file_checksum(pathname)
if checksum not in by_checksum:
by_checksum[checksum] = set()
by_checksum[checksum].add(pathname)
done_bytes += size
self.duplicates_progress(done_bytes, total_bytes, start_time)
for names in by_checksum.itervalues():
if len(names) > 1:
result.append(names)
self.progress.finished()
return result
def duplicates_progress(self, done, total, started):
duration = time.time() - started
if duration < 1:
speed = 0
else:
speed = done / duration
self.progress.write('%s/%s (%.1f%%) done (%s/s)' %
(self.human_size(done), self.human_size(total),
100.0 * float(done) / float(total),
self.human_size(speed)))
def human_size(self, size):
tab = [(1024**3, 'GiB'),
(1024**2, 'MiB'),
(1024**1, 'KiB')]
for limit, unit in tab:
if size >= limit:
return '%.1f %s' % (float(size) / float(limit), unit)
return '0 B'
def file_checksum(self, pathname):
cs = hashlib.md5()
f = file(pathname, 'rb')
while True:
data = f.read(64*1024)
if not data:
break
cs.update(data)
f.close()
return cs.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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