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# vim: fileencoding=utf-8
#
# A python interface for various rfc822-like formatted files used by Debian
# (.changes, .dsc, Packages, Sources, etc)
#
# Copyright (C) 2005-2006 dann frazier <dannf@dannf.org>
# Copyright (C) 2006-2010 John Wright <john@johnwright.org>
# Copyright (C) 2006 Adeodato Simó <dato@net.com.org.es>
# Copyright (C) 2008 Stefano Zacchiroli <zack@upsilon.cc>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation, either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
from deprecation import function_deprecated_by
try:
import apt_pkg
# This module uses apt_pkg only for its TagFile interface.
apt_pkg.TagFile
_have_apt_pkg = True
except (ImportError, AttributeError):
_have_apt_pkg = False
import chardet
import new
import re
import string
import sys
import warnings
import StringIO
import UserDict
class TagSectionWrapper(object, UserDict.DictMixin):
"""Wrap a TagSection object, using its find_raw method to get field values
This allows us to pick which whitespace to strip off the beginning and end
of the data, so we don't lose leading newlines.
"""
def __init__(self, section):
self.__section = section
def keys(self):
return self.__section.keys()
def __getitem__(self, key):
s = self.__section.find_raw(key)
if s is None:
raise KeyError(key)
# Get just the stuff after the first ':'
# Could use s.partition if we only supported python >= 2.5
data = s[s.find(':')+1:]
# Get rid of spaces and tabs after the ':', but not newlines, and strip
# off any newline at the end of the data.
return data.lstrip(' \t').rstrip('\n')
class OrderedSet(object):
"""A set-like object that preserves order when iterating over it
We use this to keep track of keys in Deb822Dict, because it's much faster
to look up if a key is in a set than in a list.
"""
def __init__(self, iterable=[]):
self.__set = set()
self.__order = []
for item in iterable:
self.add(item)
def add(self, item):
if item not in self:
# set.add will raise TypeError if something's unhashable, so we
# don't have to handle that ourselves
self.__set.add(item)
self.__order.append(item)
def remove(self, item):
# set.remove will raise KeyError, so we don't need to handle that
# ourselves
self.__set.remove(item)
self.__order.remove(item)
def __iter__(self):
# Return an iterator of items in the order they were added
return iter(self.__order)
def __contains__(self, item):
# This is what makes OrderedSet faster than using a list to keep track
# of keys. Lookup in a set is O(1) instead of O(n) for a list.
return item in self.__set
### list-like methods
append = add
def extend(self, iterable):
for item in iterable:
self.add(item)
###
class Deb822Dict(object, UserDict.DictMixin):
# Subclassing UserDict.DictMixin because we're overriding so much dict
# functionality that subclassing dict requires overriding many more than
# the four methods that DictMixin requires.
"""A dictionary-like object suitable for storing RFC822-like data.
Deb822Dict behaves like a normal dict, except:
- key lookup is case-insensitive
- key order is preserved
- if initialized with a _parsed parameter, it will pull values from
that dictionary-like object as needed (rather than making a copy).
The _parsed dict is expected to be able to handle case-insensitive
keys.
If _parsed is not None, an optional _fields parameter specifies which keys
in the _parsed dictionary are exposed.
"""
# See the end of the file for the definition of _strI
def __init__(self, _dict=None, _parsed=None, _fields=None,
encoding="utf-8"):
self.__dict = {}
self.__keys = OrderedSet()
self.__parsed = None
self.encoding = encoding
if _dict is not None:
# _dict may be a dict or a list of two-sized tuples
if hasattr(_dict, 'items'):
items = _dict.items()
else:
items = list(_dict)
try:
for k, v in items:
self[k] = v
except ValueError:
this = len(self.__keys)
len_ = len(items[this])
raise ValueError('dictionary update sequence element #%d has '
'length %d; 2 is required' % (this, len_))
if _parsed is not None:
self.__parsed = _parsed
if _fields is None:
self.__keys.extend([ _strI(k) for k in self.__parsed.keys() ])
else:
self.__keys.extend([ _strI(f) for f in _fields if self.__parsed.has_key(f) ])
### BEGIN DictMixin methods
def __setitem__(self, key, value):
key = _strI(key)
self.__keys.add(key)
self.__dict[key] = value
def __getitem__(self, key):
key = _strI(key)
try:
value = self.__dict[key]
except KeyError:
if self.__parsed is not None and key in self.__keys:
value = self.__parsed[key]
else:
raise
if isinstance(value, str):
# Always return unicode objects instead of strings
try:
value = value.decode(self.encoding)
except UnicodeDecodeError, e:
# Evidently, the value wasn't encoded with the encoding the
# user specified. Try detecting it.
warnings.warn('decoding from %s failed; attempting to detect '
'the true encoding' % self.encoding,
UnicodeWarning)
result = chardet.detect(value)
try:
value = value.decode(result['encoding'])
except UnicodeDecodeError:
raise e
else:
# Assume the rest of the paragraph is in this encoding as
# well (there's no sense in repeating this exercise for
# every field).
self.encoding = result['encoding']
return value
def __delitem__(self, key):
key = _strI(key)
self.__keys.remove(key)
try:
del self.__dict[key]
except KeyError:
# If we got this far, the key was in self.__keys, so it must have
# only been in the self.__parsed dict.
pass
def has_key(self, key):
key = _strI(key)
return key in self.__keys
def keys(self):
return [str(key) for key in self.__keys]
### END DictMixin methods
def __repr__(self):
return '{%s}' % ', '.join(['%r: %r' % (k, v) for k, v in self.items()])
def __eq__(self, other):
mykeys = self.keys(); mykeys.sort()
otherkeys = other.keys(); otherkeys.sort()
if not mykeys == otherkeys:
return False
for key in mykeys:
if self[key] != other[key]:
return False
# If we got here, everything matched
return True
def copy(self):
# Use self.__class__ so this works as expected for subclasses
copy = self.__class__(self)
return copy
# TODO implement __str__() and make dump() use that?
class Deb822(Deb822Dict):
def __init__(self, sequence=None, fields=None, _parsed=None,
encoding="utf-8"):
"""Create a new Deb822 instance.
:param sequence: a string, or any any object that returns a line of
input each time, normally a file(). Alternately, sequence can
be a dict that contains the initial key-value pairs.
:param fields: if given, it is interpreted as a list of fields that
should be parsed (the rest will be discarded).
:param _parsed: internal parameter.
:param encoding: When parsing strings, interpret them in this encoding.
(All values are given back as unicode objects, so an encoding is
necessary in order to properly interpret the strings.)
"""
if hasattr(sequence, 'items'):
_dict = sequence
sequence = None
else:
_dict = None
Deb822Dict.__init__(self, _dict=_dict, _parsed=_parsed, _fields=fields,
encoding=encoding)
if sequence is not None:
try:
self._internal_parser(sequence, fields)
except EOFError:
pass
self.gpg_info = None
def iter_paragraphs(cls, sequence, fields=None, use_apt_pkg=True,
shared_storage=False, encoding="utf-8"):
"""Generator that yields a Deb822 object for each paragraph in sequence.
:param sequence: same as in __init__.
:param fields: likewise.
:param use_apt_pkg: if sequence is a file(), apt_pkg will be used
if available to parse the file, since it's much much faster. Set
this parameter to False to disable using apt_pkg.
:param shared_storage: not used, here for historical reasons. Deb822
objects never use shared storage anymore.
:param encoding: Interpret the paragraphs in this encoding.
(All values are given back as unicode objects, so an encoding is
necessary in order to properly interpret the strings.)
"""
if _have_apt_pkg and use_apt_pkg and isinstance(sequence, file):
parser = apt_pkg.TagFile(sequence)
for section in parser:
yield cls(fields=fields, _parsed=TagSectionWrapper(section),
encoding=encoding)
else:
iterable = iter(sequence)
x = cls(iterable, fields, encoding=encoding)
while len(x) != 0:
yield x
x = cls(iterable, fields, encoding=encoding)
iter_paragraphs = classmethod(iter_paragraphs)
###
def _internal_parser(self, sequence, fields=None):
# The key is non-whitespace, non-colon characters before any colon.
key_part = r"^(?P<key>[^: \t\n\r\f\v]+)\s*:\s*"
single = re.compile(key_part + r"(?P<data>\S.*?)\s*$")
multi = re.compile(key_part + r"$")
multidata = re.compile(r"^\s(?P<data>.+?)\s*$")
wanted_field = lambda f: fields is None or f in fields
if isinstance(sequence, basestring):
sequence = sequence.splitlines()
curkey = None
content = ""
for line in self.gpg_stripped_paragraph(sequence):
m = single.match(line)
if m:
if curkey:
self[curkey] = content
if not wanted_field(m.group('key')):
curkey = None
continue
curkey = m.group('key')
content = m.group('data')
continue
m = multi.match(line)
if m:
if curkey:
self[curkey] = content
if not wanted_field(m.group('key')):
curkey = None
continue
curkey = m.group('key')
content = ""
continue
m = multidata.match(line)
if m:
content += '\n' + line # XXX not m.group('data')?
continue
if curkey:
self[curkey] = content
def __str__(self):
return self.dump()
def __unicode__(self):
return self.dump()
# __repr__ is handled by Deb822Dict
def get_as_string(self, key):
"""Return the self[key] as a string (or unicode)
The default implementation just returns unicode(self[key]); however,
this can be overridden in subclasses (e.g. _multivalued) that can take
special values.
"""
return unicode(self[key])
def dump(self, fd=None, encoding=None):
"""Dump the the contents in the original format
If fd is None, return a unicode object.
If fd is not None, attempt to encode the output to the encoding the
object was initialized with, or the value of the encoding argument if
it is not None. This will raise UnicodeEncodeError if the encoding
can't support all the characters in the Deb822Dict values.
"""
if fd is None:
fd = StringIO.StringIO()
return_string = True
else:
return_string = False
if encoding is None:
# Use the encoding we've been using to decode strings with if none
# was explicitly specified
encoding = self.encoding
for key in self.iterkeys():
value = self.get_as_string(key)
if not value or value[0] == '\n':
# Avoid trailing whitespace after "Field:" if it's on its own
# line or the value is empty
# XXX Uh, really print value if value == '\n'?
entry = '%s:%s\n' % (key, value)
else:
entry = '%s: %s\n' % (key, value)
if not return_string:
fd.write(entry.encode(encoding))
else:
fd.write(entry)
if return_string:
return fd.getvalue()
###
def is_single_line(self, s):
if s.count("\n"):
return False
else:
return True
isSingleLine = function_deprecated_by(is_single_line)
def is_multi_line(self, s):
return not self.is_single_line(s)
isMultiLine = function_deprecated_by(is_multi_line)
def _merge_fields(self, s1, s2):
if not s2:
return s1
if not s1:
return s2
if self.is_single_line(s1) and self.is_single_line(s2):
## some fields are delimited by a single space, others
## a comma followed by a space. this heuristic assumes
## that there are multiple items in one of the string fields
## so that we can pick up on the delimiter being used
delim = ' '
if (s1 + s2).count(', '):
delim = ', '
L = (s1 + delim + s2).split(delim)
L.sort()
prev = merged = L[0]
for item in L[1:]:
## skip duplicate entries
if item == prev:
continue
merged = merged + delim + item
prev = item
return merged
if self.is_multi_line(s1) and self.is_multi_line(s2):
for item in s2.splitlines(True):
if item not in s1.splitlines(True):
s1 = s1 + "\n" + item
return s1
raise ValueError
_mergeFields = function_deprecated_by(_merge_fields)
def merge_fields(self, key, d1, d2=None):
## this method can work in two ways - abstract that away
if d2 == None:
x1 = self
x2 = d1
else:
x1 = d1
x2 = d2
## we only have to do work if both objects contain our key
## otherwise, we just take the one that does, or raise an
## exception if neither does
if key in x1 and key in x2:
merged = self._mergeFields(x1[key], x2[key])
elif key in x1:
merged = x1[key]
elif key in x2:
merged = x2[key]
else:
raise KeyError
## back to the two different ways - if this method was called
## upon an object, update that object in place.
## return nothing in this case, to make the author notice a
## problem if she assumes the object itself will not be modified
if d2 == None:
self[key] = merged
return None
return merged
mergeFields = function_deprecated_by(merge_fields)
def split_gpg_and_payload(sequence):
"""Return a (gpg_pre, payload, gpg_post) tuple
Each element of the returned tuple is a list of lines (with trailing
whitespace stripped).
"""
gpg_pre_lines = []
lines = []
gpg_post_lines = []
state = 'SAFE'
gpgre = re.compile(r'^-----(?P<action>BEGIN|END) PGP (?P<what>[^-]+)-----$')
blank_line = re.compile('^$')
first_line = True
for line in sequence:
line = line.strip('\r\n')
# skip initial blank lines, if any
if first_line:
if blank_line.match(line):
continue
else:
first_line = False
m = gpgre.match(line)
if not m:
if state == 'SAFE':
if not blank_line.match(line):
lines.append(line)
else:
if not gpg_pre_lines:
# There's no gpg signature, so we should stop at
# this blank line
break
elif state == 'SIGNED MESSAGE':
if blank_line.match(line):
state = 'SAFE'
else:
gpg_pre_lines.append(line)
elif state == 'SIGNATURE':
gpg_post_lines.append(line)
else:
if m.group('action') == 'BEGIN':
state = m.group('what')
elif m.group('action') == 'END':
gpg_post_lines.append(line)
break
if not blank_line.match(line):
if not lines:
gpg_pre_lines.append(line)
else:
gpg_post_lines.append(line)
if len(lines):
return (gpg_pre_lines, lines, gpg_post_lines)
else:
raise EOFError('only blank lines found in input')
split_gpg_and_payload = staticmethod(split_gpg_and_payload)
def gpg_stripped_paragraph(cls, sequence):
return cls.split_gpg_and_payload(sequence)[1]
gpg_stripped_paragraph = classmethod(gpg_stripped_paragraph)
def get_gpg_info(self):
"""Return a GpgInfo object with GPG signature information
This method will raise ValueError if the signature is not available
(e.g. the original text cannot be found)"""
# raw_text is saved (as a string) only for Changes and Dsc (see
# _gpg_multivalued.__init__) which is small compared to Packages or
# Sources which contain no signature
if not hasattr(self, 'raw_text'):
raise ValueError, "original text cannot be found"
if self.gpg_info is None:
self.gpg_info = GpgInfo.from_sequence(self.raw_text)
return self.gpg_info
###
# XXX check what happens if input contains more that one signature
class GpgInfo(dict):
"""A wrapper around gnupg parsable output obtained via --status-fd
This class is really a dictionary containing parsed output from gnupg plus
some methods to make sense of the data.
Keys are keywords and values are arguments suitably splitted.
See /usr/share/doc/gnupg/DETAILS.gz"""
# keys with format "key keyid uid"
uidkeys = ('GOODSIG', 'EXPSIG', 'EXPKEYSIG', 'REVKEYSIG', 'BADSIG')
def valid(self):
"""Is the signature valid?"""
return self.has_key('GOODSIG') or self.has_key('VALIDSIG')
# XXX implement as a property?
# XXX handle utf-8 %-encoding
def uid(self):
"""Return the primary ID of the signee key, None is not available"""
pass
@staticmethod
def from_output(out, err=None):
"""Create a new GpgInfo object from gpg(v) --status-fd output (out) and
optionally collect stderr as well (err).
Both out and err can be lines in newline-terminated sequence or regular strings."""
n = GpgInfo()
if isinstance(out, basestring):
out = out.split('\n')
if isinstance(err, basestring):
err = err.split('\n')
n.out = out
n.err = err
header = '[GNUPG:] '
for l in out:
if not l.startswith(header):
continue
l = l[len(header):]
l = l.strip('\n')
# str.partition() would be better, 2.5 only though
s = l.find(' ')
key = l[:s]
if key in GpgInfo.uidkeys:
# value is "keyid UID", don't split UID
value = l[s+1:].split(' ', 1)
else:
value = l[s+1:].split(' ')
n[key] = value
return n
# XXX how to handle sequences of lines? file() returns \n-terminated
@staticmethod
def from_sequence(sequence, keyrings=['/usr/share/keyrings/debian-keyring.gpg'],
executable=["/usr/bin/gpgv"]):
"""Create a new GpgInfo object from the given sequence.
Sequence is a sequence of lines or a string
executable is a list of args for subprocess.Popen, the first element being the gpg executable"""
# XXX check for gpg as well and use --verify accordingly?
args = executable
#args.extend(["--status-fd", "1", "--no-default-keyring"])
args.extend(["--status-fd", "1"])
import os
[args.extend(["--keyring", k]) for k in keyrings if os.path.isfile(k) and os.access(k, os.R_OK)]
if "--keyring" not in args:
raise IOError, "cannot access any of the given keyrings"
import subprocess
p = subprocess.Popen(args, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
# XXX what to do with exit code?
if isinstance(sequence, basestring):
(out, err) = p.communicate(sequence)
else:
(out, err) = p.communicate("\n".join(sequence))
return GpgInfo.from_output(out, err)
@staticmethod
def from_file(target, *args):
"""Create a new GpgInfo object from the given file, calls from_sequence(file(target), *args)"""
return from_sequence(file(target), *args)
###
class PkgRelation(object):
"""Inter-package relationships
Structured representation of the relationships of a package to another,
i.e. of what can appear in a Deb882 field like Depends, Recommends,
Suggests, ... (see Debian Policy 7.1).
"""
# XXX *NOT* a real dependency parser, and that is not even a goal here, we
# just parse as much as we need to split the various parts composing a
# dependency, checking their correctness wrt policy is out of scope
__dep_RE = re.compile( \
r'^\s*(?P<name>[a-zA-Z0-9.+\-]{2,})(\s*\(\s*(?P<relop>[>=<]+)\s*(?P<version>[0-9a-zA-Z:\-+~.]+)\s*\))?(\s*\[(?P<archs>[\s!\w\-]+)\])?\s*$')
__comma_sep_RE = re.compile(r'\s*,\s*')
__pipe_sep_RE = re.compile(r'\s*\|\s*')
__blank_sep_RE = re.compile(r'\s*')
@classmethod
def parse_relations(cls, raw):
"""Parse a package relationship string (i.e. the value of a field like
Depends, Recommends, Build-Depends ...)
"""
def parse_archs(raw):
# assumption: no space beween '!' and architecture name
archs = []
for arch in cls.__blank_sep_RE.split(raw.strip()):
if len(arch) and arch[0] == '!':
archs.append((False, arch[1:]))
else:
archs.append((True, arch))
return archs
def parse_rel(raw):
match = cls.__dep_RE.match(raw)
if match:
parts = match.groupdict()
d = { 'name': parts['name'] }
if not (parts['relop'] is None or parts['version'] is None):
d['version'] = (parts['relop'], parts['version'])
else:
d['version'] = None
if parts['archs'] is None:
d['arch'] = None
else:
d['arch'] = parse_archs(parts['archs'])
return d
else:
print >> sys.stderr, \
'deb822.py: WARNING: cannot parse package' \
' relationship "%s", returning it raw' % raw
return { 'name': raw, 'version': None, 'arch': None }
tl_deps = cls.__comma_sep_RE.split(raw.strip()) # top-level deps
cnf = map(cls.__pipe_sep_RE.split, tl_deps)
return map(lambda or_deps: map(parse_rel, or_deps), cnf)
@staticmethod
def str(rels):
"""Format to string structured inter-package relationships
Perform the inverse operation of parse_relations, returning a string
suitable to be written in a package stanza.
"""
def pp_arch(arch_spec):
(excl, arch) = arch_spec
if excl:
return arch
else:
return '!' + arch
def pp_atomic_dep(dep):
s = dep['name']
if dep.has_key('version') and dep['version'] is not None:
s += ' (%s %s)' % dep['version']
if dep.has_key('arch') and dep['arch'] is not None:
s += ' [%s]' % string.join(map(pp_arch, dep['arch']))
return s
pp_or_dep = lambda deps: string.join(map(pp_atomic_dep, deps), ' | ')
return string.join(map(pp_or_dep, rels), ', ')
class _lowercase_dict(dict):
"""Dictionary wrapper which lowercase keys upon lookup."""
def __getitem__(self, key):
return dict.__getitem__(self, key.lower())
class _PkgRelationMixin(object):
"""Package relationship mixin
Inheriting from this mixin you can extend a Deb882 object with attributes
letting you access inter-package relationship in a structured way, rather
than as strings. For example, while you can usually use pkg['depends'] to
obtain the Depends string of package pkg, mixing in with this class you
gain pkg.depends to access Depends as a Pkgrel instance
To use, subclass _PkgRelationMixin from a class with a _relationship_fields
attribute. It should be a list of field names for which structured access
is desired; for each of them a method wild be added to the inherited class.
The method name will be the lowercase version of field name; '-' will be
mangled as '_'. The method would return relationships in the same format of
the PkgRelation' relations property.
See Packages and Sources as examples.
"""
def __init__(self, *args, **kwargs):
self.__relations = _lowercase_dict({})
self.__parsed_relations = False
for name in self._relationship_fields:
# To avoid reimplementing Deb822 key lookup logic we use a really
# simple dict subclass which just lowercase keys upon lookup. Since
# dictionary building happens only here, we ensure that all keys
# are in fact lowercase.
# With this trick we enable users to use the same key (i.e. field
# name) of Deb822 objects on the dictionary returned by the
# relations property.
keyname = name.lower()
if self.has_key(name):
self.__relations[keyname] = None # lazy value
# all lazy values will be expanded before setting
# __parsed_relations to True
else:
self.__relations[keyname] = []
@property
def relations(self):
"""Return a dictionary of inter-package relationships among the current
and other packages.
Dictionary keys depend on the package kind. Binary packages have keys
like 'depends', 'recommends', ... while source packages have keys like
'build-depends', 'build-depends-indep' and so on. See the Debian policy
for the comprehensive field list.
Dictionary values are package relationships returned as lists of lists
of dictionaries (see below for some examples).
The encoding of package relationships is as follows:
- the top-level lists corresponds to the comma-separated list of
Deb822, their components form a conjuction, i.e. they have to be
AND-ed together
- the inner lists corresponds to the pipe-separated list of Deb822,
their components form a disjunction, i.e. they have to be OR-ed
together
- member of the inner lists are dictionaries with the following keys:
- name: package (or virtual package) name
- version: A pair <operator, version> if the relationship is
versioned, None otherwise. operator is one of "<<",
"<=", "=", ">=", ">>"; version is the given version as
a string.
- arch: A list of pairs <polarity, architecture> if the
relationship is architecture specific, None otherwise.
Polarity is a boolean (false if the architecture is
negated with "!", true otherwise), architecture the
Debian archtiecture name as a string.
Examples:
"emacs | emacsen, make, debianutils (>= 1.7)" becomes
[ [ {'name': 'emacs'}, {'name': 'emacsen'} ],
[ {'name': 'make'} ],
[ {'name': 'debianutils', 'version': ('>=', '1.7')} ] ]
"tcl8.4-dev, procps [!hurd-i386]" becomes
[ [ {'name': 'tcl8.4-dev'} ],
[ {'name': 'procps', 'arch': (false, 'hurd-i386')} ] ]
"""
if not self.__parsed_relations:
lazy_rels = filter(lambda n: self.__relations[n] is None,
self.__relations.keys())
for n in lazy_rels:
self.__relations[n] = PkgRelation.parse_relations(self[n])
self.__parsed_relations = True
return self.__relations
class _multivalued(Deb822):
"""A class with (R/W) support for multivalued fields.
To use, create a subclass with a _multivalued_fields attribute. It should
be a dictionary with *lower-case* keys, with lists of human-readable
identifiers of the fields as the values. Please see Dsc, Changes, and
PdiffIndex as examples.
"""
def __init__(self, *args, **kwargs):
Deb822.__init__(self, *args, **kwargs)
for field, fields in self._multivalued_fields.items():
try:
contents = self[field]
except KeyError:
continue
if self.is_multi_line(contents):
self[field] = []
updater_method = self[field].append
else:
self[field] = Deb822Dict()
updater_method = self[field].update
for line in filter(None, contents.splitlines()):
updater_method(Deb822Dict(zip(fields, line.split())))
def get_as_string(self, key):
keyl = key.lower()
if keyl in self._multivalued_fields:
fd = StringIO.StringIO()
if hasattr(self[key], 'keys'): # single-line
array = [ self[key] ]
else: # multi-line
fd.write("\n")
array = self[key]
order = self._multivalued_fields[keyl]
try:
field_lengths = self._fixed_field_lengths
except AttributeError:
field_lengths = {}
for item in array:
for x in order:
raw_value = str(item[x])
try:
length = field_lengths[keyl][x]
except KeyError:
value = raw_value
else:
value = (length - len(raw_value)) * " " + raw_value
fd.write(" %s" % value)
fd.write("\n")
return fd.getvalue().rstrip("\n")
else:
return Deb822.get_as_string(self, key)
###
class _gpg_multivalued(_multivalued):
"""A _multivalued class that can support gpg signed objects
This class's feature is that it stores the raw text before parsing so that
gpg can verify the signature. Use it just like you would use the
_multivalued class.
This class only stores raw text if it is given a raw string, or if it
detects a gpg signature when given a file or sequence of lines (see
Deb822.split_gpg_and_payload for details).
"""
def __init__(self, *args, **kwargs):
try:
sequence = args[0]
except IndexError:
sequence = kwargs.get("sequence", None)
if sequence is not None:
if isinstance(sequence, basestring):
self.raw_text = sequence
elif hasattr(sequence, "items"):
# sequence is actually a dict(-like) object, so we don't have
# the raw text.
pass
else:
try:
gpg_pre_lines, lines, gpg_post_lines = \
self.split_gpg_and_payload(sequence)
except EOFError:
# Empty input
gpg_pre_lines = lines = gpg_post_lines = []
if gpg_pre_lines and gpg_post_lines:
raw_text = StringIO.StringIO()
raw_text.write("\n".join(gpg_pre_lines))
raw_text.write("\n\n")
raw_text.write("\n".join(lines))
raw_text.write("\n\n")
raw_text.write("\n".join(gpg_post_lines))
self.raw_text = raw_text.getvalue()
try:
args = list(args)
args[0] = lines
except IndexError:
kwargs["sequence"] = lines
_multivalued.__init__(self, *args, **kwargs)
class Dsc(_gpg_multivalued):
_multivalued_fields = {
"files": [ "md5sum", "size", "name" ],
"checksums-sha1": ["sha1", "size", "name"],
"checksums-sha256": ["sha256", "size", "name"],
}
class Changes(_gpg_multivalued):
_multivalued_fields = {
"files": [ "md5sum", "size", "section", "priority", "name" ],
"checksums-sha1": ["sha1", "size", "name"],
"checksums-sha256": ["sha256", "size", "name"],
}
def get_pool_path(self):
"""Return the path in the pool where the files would be installed"""
# This is based on the section listed for the first file. While
# it is possible, I think, for a package to provide files in multiple
# sections, I haven't seen it in practice. In any case, this should
# probably detect such a situation and complain, or return a list...
s = self['files'][0]['section']
try:
section, subsection = s.split('/')
except ValueError:
# main is implicit
section = 'main'
if self['source'].startswith('lib'):
subdir = self['source'][:4]
else:
subdir = self['source'][0]
return 'pool/%s/%s/%s' % (section, subdir, self['source'])
class PdiffIndex(_multivalued):
_multivalued_fields = {
"sha1-current": [ "SHA1", "size" ],
"sha1-history": [ "SHA1", "size", "date" ],
"sha1-patches": [ "SHA1", "size", "date" ],
}
@property
def _fixed_field_lengths(self):
fixed_field_lengths = {}
for key in self._multivalued_fields:
if hasattr(self[key], 'keys'):
# Not multi-line -- don't need to compute the field length for
# this one
continue
length = self._get_size_field_length(key)
fixed_field_lengths[key] = {"size": length}
return fixed_field_lengths
def _get_size_field_length(self, key):
lengths = [len(str(item['size'])) for item in self[key]]
return max(lengths)
class Release(_multivalued):
"""Represents a Release file
Set the size_field_behavior attribute to "dak" to make the size field
length only as long as the longest actual value. The default,
"apt-ftparchive" makes the field 16 characters long regardless.
"""
# FIXME: Add support for detecting the behavior of the input, if
# constructed from actual 822 text.
_multivalued_fields = {
"md5sum": [ "md5sum", "size", "name" ],
"sha1": [ "sha1", "size", "name" ],
"sha256": [ "sha256", "size", "name" ],
}
__size_field_behavior = "apt-ftparchive"
def set_size_field_behavior(self, value):
if value not in ["apt-ftparchive", "dak"]:
raise ValueError("size_field_behavior must be either "
"'apt-ftparchive' or 'dak'")
else:
self.__size_field_behavior = value
size_field_behavior = property(lambda self: self.__size_field_behavior,
set_size_field_behavior)
@property
def _fixed_field_lengths(self):
fixed_field_lengths = {}
for key in self._multivalued_fields:
length = self._get_size_field_length(key)
fixed_field_lengths[key] = {"size": length}
return fixed_field_lengths
def _get_size_field_length(self, key):
if self.size_field_behavior == "apt-ftparchive":
return 16
elif self.size_field_behavior == "dak":
lengths = [len(str(item['size'])) for item in self[key]]
return max(lengths)
class Sources(Dsc, _PkgRelationMixin):
"""Represent an APT source package list"""
_relationship_fields = [ 'build-depends', 'build-depends-indep',
'build-conflicts', 'build-conflicts-indep', 'binary' ]
def __init__(self, *args, **kwargs):
Dsc.__init__(self, *args, **kwargs)
_PkgRelationMixin.__init__(self, *args, **kwargs)
class Packages(Deb822, _PkgRelationMixin):
"""Represent an APT binary package list"""
_relationship_fields = [ 'depends', 'pre-depends', 'recommends',
'suggests', 'breaks', 'conflicts', 'provides', 'replaces',
'enhances' ]
def __init__(self, *args, **kwargs):
Deb822.__init__(self, *args, **kwargs)
_PkgRelationMixin.__init__(self, *args, **kwargs)
###
class _CaseInsensitiveString(str):
"""Case insensitive string.
"""
def __new__(cls, str_):
s = str.__new__(cls, str_)
s.str_lower = str_.lower()
s.str_lower_hash = hash(s.str_lower)
return s
def __hash__(self):
return self.str_lower_hash
def __eq__(self, other):
return self.str_lower == other.lower()
def lower(self):
return self.str_lower
_strI = _CaseInsensitiveString
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