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#!/usr/bin/env python3
from optparse import OptionParser
import fnmatch
import struct
import tarfile
import zipfile
from datetime import datetime, timezone
from io import BytesIO
import re
import os
import sys
import email.message
import urllib.request
from urllib.parse import urlparse
class URLFile(object):
'''Simple proxy to urllib.request.urlopen, that responds to seek only if
it's called before read. This is enough for tarfile to be happy'''
def __init__(self, url):
self.file = urllib.request.urlopen(url)
def seekable(self):
return True
def seek(self, offset, whence = os.SEEK_SET):
if whence != os.SEEK_SET or offset != 0 or self.read == self._read:
raise Exception("unsupported")
def _read(self, size = -1):
return self.file.read(size)
def read(self, size = -1):
self.read = self._read
return self._read(size)
def close(self):
self.file.close()
def dirname(filespec):
'''Returns os.path.dirname if a file, and '' if an url'''
if urlparse(filespec).scheme:
return ''
return os.path.dirname(filespec)
class TarFilterList(object):
def __init__(self, filename):
self.patterns = {}
for filt in open(filename).readlines():
f = filt.strip().split(None, 1)
if len(f) == 1:
[pat] = f
cmd = None
else:
[pat, cmd] = f
pat = pat.split(os.sep)
self.add_pattern(pat, self.patterns, cmd)
def add_pattern(self, pat, patterns, cmd):
if re.search(r'[\[\?\*]', pat[0]):
if not '*' in patterns:
patterns['*'] = []
patterns['*'].append([os.sep.join(pat), cmd, False])
else:
if len(pat) >= 2:
if not pat[0] in patterns:
patterns[pat[0]] = {}
self.add_pattern(pat[1:], patterns[pat[0]], cmd)
else:
if not '*' in patterns:
patterns['*'] = []
patterns['*'].append([pat[0], cmd, False])
def match(self, name):
name = name.split(os.sep)[1:]
if len(name) == 0:
return False
return self._match(name, self.patterns)
def _match(self, name, patterns):
if len(name) > 1 and name[0] in patterns:
cmd = self._match(name[1:], patterns[name[0]])
if cmd != False:
return cmd
if '*' in patterns:
for pat in patterns['*']:
if fnmatch.fnmatch(name[0], pat[0]) or fnmatch.fnmatch(os.sep.join(name), pat[0]):
pat[2] = True
return pat[1]
return False
def unused(self, patterns=None, root=''):
result = []
if root:
root += '/'
if not patterns:
patterns = self.patterns
for pat in patterns:
if pat != '*':
result += self.unused(patterns[pat], root + pat)
else:
for p in patterns[pat]:
if not p[2]:
result.append(root + p[0])
return result
def file_extension(name):
return os.path.splitext(name)[1][1:]
class ZipAsTar(object):
def __init__(self, zip):
self.zip = zip
self.infos = {}
def close(self):
self.zip.close()
def extractfile(self, info):
return self.zip.open(self.infos[info], mode="r")
def __iter__(self):
for info in self.zip.infolist():
tar_info = tarfile.TarInfo(info.filename)
self.infos[tar_info] = info.filename
tar_info.size = info.file_size
mtime = datetime(*info.date_time, tzinfo=timezone.utc)
tar_info.mtime = mtime.timestamp()
extra = info.extra
while len(extra) >= 4:
signature, length = struct.unpack("<HH", extra[:4])
assert len(extra) >= length + 4
if signature == 0x5455: # extended timestamps
(flags,) = struct.unpack("B", extra[4:5])
if flags & 0x1: # mtime
assert length >= 5
(mtime,) = struct.unpack("<L", extra[5:9])
tar_info.mtime = float(mtime)
extra = extra[length + 4:]
tar_info.mode = (info.external_attr >> 16) & 0o777
if len(info.filename) > tarfile.LENGTH_NAME:
tar_info.pax_headers["path"] = info.filename
yield tar_info
def filter_archive(orig, new, filt, topdir = None):
filt = TarFilterList(filt)
is_url = urlparse(orig).scheme
if orig.endswith(".zip"):
if is_url:
# zipfile needs to seek so doesn't work with the simple URLFile. Only
# the l10n packages are zipfiles and they are small so buffering the
# whole archive in memory is fine
orig_bytes = urllib.request.urlopen(orig).read()
zip = zipfile.ZipFile(BytesIO(orig_bytes))
else:
zip = zipfile.ZipFile(orig)
tar = ZipAsTar(zip)
format = tarfile.PAX_FORMAT
else:
fileobj = URLFile(orig) if is_url else None
tar = tarfile.open(orig, "r:" + file_extension(orig), fileobj)
format = tar.format
new_tar = tarfile.open(new + ".new", "w:" + file_extension(new), format=format)
for info in tar:
if topdir:
namefilt = lambda n: "/".join([topdir] + n.split("/")[1:])
info.name = namefilt(info.name)
if "path" in info.pax_headers:
info.pax_headers["path"] = namefilt(info.pax_headers["path"])
do_filt = filt.match(info.name)
if do_filt == None:
print("Removing", info.name, file=sys.stderr)
continue
if info.isfile():
file = tar.extractfile(info)
if do_filt:
print("Filtering", info.name, file=sys.stderr)
orig = file
file = BytesIO()
the_filt = lambda l: l
if do_filt[0].isalpha():
f = do_filt.split(do_filt[1])
if f[0] == 's':
the_filt = lambda l: re.sub(f[1], f[2],
l.decode()).encode('utf-8')
else:
f = do_filt.split(do_filt[0])
if f[2] == 'd':
the_filt = lambda l: b'' if re.search(f[1],
l.decode()) else l
for l in orig.readlines():
file.write(the_filt(l))
info.size = file.tell()
file.seek(0);
new_tar.addfile(info, file)
else:
new_tar.addfile(info)
tar.close()
new_tar.close()
os.rename(new_tar.name, new)
unused = filt.unused()
if unused:
print('Unused filters:')
print('', '\n '.join(unused))
def get_package_name():
control = os.path.join(os.path.dirname(__file__), "control")
return email.message.Message(open(control))["Source"]
def main():
parser = OptionParser()
parser.add_option("-u", "--upstream-version", dest="upstream_version",
help="define upstream version number to use when creating the file",
metavar="VERSION")
parser.add_option("-f", "--filter", dest="filter",
help="use the given filter list", metavar="FILE")
parser.add_option("-p", "--package", dest="package",
help="use the given package name", metavar="NAME")
parser.add_option("-o", "--output", dest="new_file",
help="save the filtered tarball as the given file name", metavar="FILE")
parser.add_option("-t", "--topdir", dest="topdir",
help="replace the top directory with the given name", metavar="NAME")
(options, args) = parser.parse_args()
if not options.upstream_version and not options.new_file:
parser.error("Need an upstream version")
return
if len(args) < 1:
parser.error("Too few arguments")
return
if len(args) > 1:
parser.error("Too many arguments")
return
if not options.filter:
options.filter = os.path.join(os.path.dirname(__file__), "source.filter")
if not options.package:
options.package = get_package_name()
if options.new_file:
new_file = options.new_file
if os.path.islink(args[0]):
orig = os.path.realpath(args[0])
if not new_file:
new_file = args[0]
else:
orig = args[0]
compression = file_extension(orig)
if not new_file:
new_file = options.package + "_" + options.upstream_version + ".orig.tar." + compression
new_file = os.path.realpath(os.path.join(dirname(orig), new_file))
print(orig, new_file)
filter_archive(orig, new_file, options.filter, options.topdir)
if __name__ == '__main__':
main()
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