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