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from __future__ import print_function
from . import ar
import os.path
import re
import tarfile
from io import BytesIO
from . import packagequery
import itertools
HAVE_LZMA = True
try:
import lzma
except ImportError:
HAVE_LZMA = False
if (not hasattr(itertools, 'zip_longest')
and hasattr(itertools, 'izip_longest')):
# python2 case
itertools.zip_longest = itertools.izip_longest
class DebError(packagequery.PackageError):
pass
class DebQuery(packagequery.PackageQuery, packagequery.PackageQueryResult):
default_tags = (b'package', b'version', b'release', b'epoch',
b'architecture', b'description', b'provides', b'depends',
b'pre_depends', b'conflicts', b'breaks')
def __init__(self, fh):
self.__file = fh
self.__path = os.path.abspath(fh.name)
self.filename_suffix = 'deb'
self.fields = {}
def read(self, all_tags=False, self_provides=True, *extra_tags):
arfile = ar.Ar(fh = self.__file)
arfile.read()
debbin = arfile.get_file(b'debian-binary')
if debbin is None:
raise DebError(self.__path, 'no debian binary')
if debbin.read() != b'2.0\n':
raise DebError(self.__path, 'invalid debian binary format')
control = arfile.get_file(b'control.tar.gz')
if control is not None:
# XXX: python2.4 relies on a name
tar = tarfile.open(name='control.tar.gz', fileobj=control)
else:
control = arfile.get_file(b'control.tar.xz')
if control is None:
raise DebError(self.__path, 'missing control.tar')
if not HAVE_LZMA:
raise DebError(self.__path, 'can\'t open control.tar.xz without python-lzma')
decompressed = lzma.decompress(control.read())
tar = tarfile.open(name="control.tar.xz",
fileobj=BytesIO(decompressed))
try:
name = './control'
# workaround for python2.4's tarfile module
if 'control' in tar.getnames():
name = 'control'
control = tar.extractfile(name)
except KeyError:
raise DebError(self.__path,
'missing \'control\' file in control.tar')
self.__parse_control(control, all_tags, self_provides, *extra_tags)
return self
def __parse_control(self, control, all_tags=False, self_provides=True, *extra_tags):
data = control.readline().strip()
while data:
field, val = re.split(b':\s*', data.strip(), 1)
data = control.readline()
while data and re.match(b'\s+', data):
val += b'\n' + data.strip()
data = control.readline().rstrip()
field = field.replace(b'-', b'_').lower()
if field in self.default_tags + extra_tags or all_tags:
# a hyphen is not allowed in dict keys
self.fields[field] = val
versrel = self.fields[b'version'].rsplit(b'-', 1)
if len(versrel) == 2:
self.fields[b'version'] = versrel[0]
self.fields[b'release'] = versrel[1]
else:
self.fields[b'release'] = None
verep = self.fields[b'version'].split(b':', 1)
if len(verep) == 2:
self.fields[b'epoch'] = verep[0]
self.fields[b'version'] = verep[1]
else:
self.fields[b'epoch'] = b'0'
self.fields[b'provides'] = self._split_field_value(b'provides')
self.fields[b'depends'] = self._split_field_value(b'depends')
self.fields[b'pre_depends'] = self._split_field_value(b'pre_depends')
self.fields[b'conflicts'] = self._split_field_value(b'conflicts')
self.fields[b'breaks'] = self._split_field_value(b'breaks')
self.fields[b'recommends'] = self._split_field_value(b'recommends')
self.fields[b'suggests'] = self._split_field_value(b'suggests')
self.fields[b'enhances'] = self._split_field_value(b'enhances')
if self_provides:
# add self provides entry
self.fields[b'provides'].append(b'%s (= %s)' % (self.name(), b'-'.join(versrel)))
def _split_field_value(self, field, delimeter=b',\s*'):
return [i.strip()
for i in re.split(delimeter, self.fields.get(field, b'')) if i]
def vercmp(self, debq):
res = packagequery.cmp(int(self.epoch()), int(debq.epoch()))
if res != 0:
return res
res = DebQuery.debvercmp(self.version(), debq.version())
if res != 0:
return res
res = DebQuery.debvercmp(self.release(), debq.release())
return res
def name(self):
return self.fields[b'package']
def version(self):
return self.fields[b'version']
def release(self):
return self.fields[b'release']
def epoch(self):
return self.fields[b'epoch']
def arch(self):
return self.fields[b'architecture']
def description(self):
return self.fields[b'description']
def path(self):
return self.__path
def provides(self):
return self.fields[b'provides']
def requires(self):
return self.fields[b'depends'] + self.fields[b'pre_depends']
def conflicts(self):
return self.fields[b'conflicts'] + self.fields[b'breaks']
def obsoletes(self):
return []
def recommends(self):
return self.fields[b'recommends']
def suggests(self):
return self.fields[b'suggests']
def supplements(self):
# a control file has no notion of "supplements"
return []
def enhances(self):
return self.fields[b'enhances']
def gettag(self, num):
return self.fields.get(num, None)
def canonname(self):
return DebQuery.filename(self.name(), self.epoch(), self.version(), self.release(), self.arch())
@staticmethod
def query(filename, all_tags = False, *extra_tags):
f = open(filename, 'rb')
debq = DebQuery(f)
debq.read(all_tags, *extra_tags)
f.close()
return debq
@staticmethod
def debvercmp(ver1, ver2):
"""
implementation of dpkg's version comparison algorithm
"""
# 32 is arbitrary - it is needed for the "longer digit string wins" handling
# (found this nice approach in Build/Deb.pm (build package))
ver1 = re.sub(b'(\d+)', lambda m: (32 * b'0' + m.group(1))[-32:], ver1)
ver2 = re.sub(b'(\d+)', lambda m: (32 * b'0' + m.group(1))[-32:], ver2)
vers = itertools.zip_longest(ver1, ver2, fillvalue=b'')
for v1, v2 in vers:
if v1 == v2:
continue
if not v1:
# this makes the corresponding condition in the following
# else part superfluous - keep the superfluous condition for
# now (just to ease a (hopefully) upcoming refactoring (this
# method really deserves a cleanup...))
return -1
if not v2:
# see above
return 1
v1 = bytes(bytearray([v1]))
v2 = bytes(bytearray([v2]))
if (v1.isalpha() and v2.isalpha()) or (v1.isdigit() and v2.isdigit()):
res = packagequery.cmp(v1, v2)
if res != 0:
return res
else:
if v1 == b'~' or not v1:
return -1
elif v2 == b'~' or not v2:
return 1
ord1 = ord(v1)
if not (v1.isalpha() or v1.isdigit()):
ord1 += 256
ord2 = ord(v2)
if not (v2.isalpha() or v2.isdigit()):
ord2 += 256
if ord1 > ord2:
return 1
else:
return -1
return 0
@staticmethod
def filename(name, epoch, version, release, arch):
if release:
return b'%s_%s-%s_%s.deb' % (name, version, release, arch)
else:
return b'%s_%s_%s.deb' % (name, version, arch)
if __name__ == '__main__':
import sys
try:
debq = DebQuery.query(sys.argv[1])
except DebError as e:
print(e.msg)
sys.exit(2)
print(debq.name(), debq.version(), debq.release(), debq.arch())
print(debq.description())
print('##########')
print(b'\n'.join(debq.provides()))
print('##########')
print(b'\n'.join(debq.requires()))
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