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#!/usr/bin/env python3
#
# Copyright (c) 2017 Jon Turney
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
import argparse
import hashlib
import re
import os
import sys
import tarfile
import xtarfile
from . import common_constants
#
# look for archives which are duplicated between x86 and x86_64
# (these should probably be moved to noarch or src)
#
#
# helper function to compute sha512 for a particular file
# (block_size should be some multiple of sha512 block size which can be
# efficiently read)
#
def sha512_file(f, block_size=256 * 128):
sha512 = hashlib.sha512()
for chunk in iter(lambda: f.read(block_size), b''):
sha512.update(chunk)
return sha512.hexdigest()
#
#
#
class TarMemberInfo:
def __init__(self, info, sha512):
self.info = info
self.sha512 = sha512
def read_tar(f):
result = {}
try:
with xtarfile.open(f, mode='r') as t:
for m in t:
if m.isfile():
f = t.extractfile(m)
sha512 = sha512_file(f)
else:
sha512 = None
result[m.name] = TarMemberInfo(m, sha512)
except tarfile.ReadError:
# if we can't read the tar archive, we should never consider it to have
# the same contents as another tar archive...
result[f] = None
return result
#
#
#
def compare_archives(f1, f2):
# for speed, first check that archives are of the same size
if os.path.getsize(f1) != os.path.getsize(f2):
return 'different archive size'
# if they are both compressed empty files (rather than compressed empty tar
# archives), they are the same
if os.path.getsize(f1) <= 32:
return None
t1 = read_tar(f1)
t2 = read_tar(f2)
if t1.keys() != t2.keys():
return 'different member lists'
for m in t1:
# compare size of member
if t1[m].info.size != t2[m].info.size:
return 'different size for member %s' % m
# compare type of member
if t1[m].info.type != t2[m].info.type:
return 'different type for member %s' % m
# for files, compare hash of file content
if t1[m].info.isfile():
if t1[m].sha512 != t2[m].sha512:
return 'different hash for member %s' % m
# for links, compare target
elif t1[m].info.islnk() or t1[m].info.issym():
if t1[m].info.linkname != t2[m].info.linkname:
return 'different linkname for member %s' % m
# permitted differences: mtime, mode, owner uid/gid
return None
#
#
#
def find_duplicates(args):
basedir = os.path.join(args.rel_area, common_constants.ARCHES[0], 'release')
for (dirpath, _subdirs, files) in os.walk(basedir):
relpath = os.path.relpath(dirpath, basedir)
otherdir = os.path.join(args.rel_area, common_constants.ARCHES[1], 'release', relpath)
for f in files:
# not an archive
if not re.match(r'^.*\.tar' + common_constants.PACKAGE_COMPRESSIONS_RE + r'$', f):
continue
f1 = os.path.join(dirpath, f)
f2 = os.path.join(otherdir, f)
if os.path.exists(f2):
difference = compare_archives(f1, f2)
if difference is None:
print(os.path.join('release', relpath, f))
elif args.verbose:
print('%s: %s' % (os.path.join('release', relpath, f), difference))
#
#
#
def main():
relarea_default = common_constants.FTP
parser = argparse.ArgumentParser(description='Source package deduplicator')
parser.add_argument('--releasearea', action='store', metavar='DIR', help="release directory (default: " + relarea_default + ")", default=relarea_default, dest='rel_area')
parser.add_argument('-v', '--verbose', action='count', dest='verbose', help='verbose output')
(args) = parser.parse_args()
return find_duplicates(args)
#
#
#
if __name__ == "__main__":
sys.exit(main())
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