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#!/usr/bin/env python3
from optparse import OptionParser
import fnmatch
import tarfile
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:]
def filter_tar(orig, new, filt, topdir = None):
filt = TarFilterList(filt)
if urlparse(orig).scheme:
tar = tarfile.open(orig, "r:" + file_extension(orig), URLFile(orig))
else:
tar = tarfile.open(orig, "r:" + file_extension(orig))
new_tar = tarfile.open(new + ".new", "w:" + file_extension(new), format=tar.format)
while True:
info = tar.next()
if not info:
break
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_tar(orig, new_file, options.filter, options.topdir)
if __name__ == '__main__':
main()
|
