/usr/lib/python3/dist-packages/diffoscope/comparators/squashfs.py is in diffoscope 93ubuntu1.
This file is owned by root:root, with mode 0o644.
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#
# diffoscope: in-depth comparison of files, archives, and directories
#
# Copyright © 2015 Reiner Herrmann <reiner@reiner-h.de>
# 2015 Jérémy Bobbio <lunar@debian.org>
#
# diffoscope 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 3 of the License, or
# (at your option) any later version.
#
# diffoscope 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 diffoscope. If not, see <https://www.gnu.org/licenses/>.
import os
import re
import stat
import logging
import functools
import subprocess
import collections
from diffoscope.tools import tool_required
from diffoscope.difference import Difference
from diffoscope.tempfiles import get_temporary_directory
from .utils.file import File
from .device import Device
from .symlink import Symlink
from .directory import Directory
from .utils.archive import Archive, ArchiveMember
from .utils.command import Command
logger = logging.getLogger(__name__)
class SquashfsSuperblock(Command):
@tool_required('unsquashfs')
def cmdline(self):
return ['unsquashfs', '-s', self.path]
def filter(self, line):
# strip filename
return re.sub(
r'^(Found a valid .*) on .*',
'\\1',
line.decode('utf-8'),
).encode('utf-8')
class SquashfsListing(Command):
@tool_required('unsquashfs')
def cmdline(self):
return ['unsquashfs', '-d', '', '-lls', self.path]
class SquashfsInvalidLineFormat(Exception):
pass
class SquashfsMember(ArchiveMember):
def is_directory(self):
return False
def is_symlink(self):
return False
def is_device(self):
return False
@property
def path(self):
# Use our extracted version and also avoid creating a temporary
# directory per-file in ArchiveMember.path.
return os.path.join(self.container._temp_dir, self._name)
@property
def name(self):
# Don't include the leading "." in the output (eg. "./etc/shadow")
return self._name[1:]
class SquashfsRegularFile(SquashfsMember):
# Example line:
# -rw-r--r-- user/group 446 2015-06-24 14:49 squashfs-root/text
LINE_RE = re.compile(r'^\S+\s+\S+\s+\S+\s+\S+\s+\S+\s+(?P<member_name>.*)$')
@staticmethod
def parse(line):
m = SquashfsRegularFile.LINE_RE.match(line)
if not m:
raise SquashfsInvalidLineFormat("invalid line format")
return m.groupdict()
def __init__(self, archive, member_name):
SquashfsMember.__init__(self, archive, member_name)
class SquashfsDirectory(Directory, SquashfsMember):
# Example line:
# drwxr-xr-x user/group 51 2015-06-24 14:47 squashfs-root
LINE_RE = re.compile(r'^\S+\s+\S+\s+\S+\s+\S+\s+\S+\s+(?P<member_name>.*)$')
@staticmethod
def parse(line):
m = SquashfsDirectory.LINE_RE.match(line)
if not m:
raise SquashfsInvalidLineFormat("invalid line format")
return m.groupdict()
def __init__(self, archive, member_name):
SquashfsMember.__init__(self, archive, member_name or '/')
def compare(self, other, source=None):
return None
def has_same_content_as(self, other):
return False
@property
def path(self):
raise NotImplementedError("SquashfsDirectory is not meant to be extracted.")
def is_directory(self):
return True
def get_member_names(self):
raise ValueError("squashfs are compared as a whole.") # noqa
def get_member(self, member_name):
raise ValueError("squashfs are compared as a whole.") # noqa
class SquashfsSymlink(Symlink, SquashfsMember):
# Example line:
# lrwxrwxrwx user/group 6 2015-06-24 14:47 squashfs-root/link -> broken
LINE_RE = re.compile(
r'^\S+\s+\S+\s+\S+\s+\S+\s+\S+\s+(?P<member_name>.*)\s+->\s+(?P<destination>.*)$',
)
@staticmethod
def parse(line):
m = SquashfsSymlink.LINE_RE.match(line)
if not m:
raise SquashfsInvalidLineFormat("invalid line format")
return m.groupdict()
def __init__(self, archive, member_name, destination):
SquashfsMember.__init__(self, archive, member_name)
self._destination = destination
def is_symlink(self):
return True
@property
def symlink_destination(self):
return self._destination
class SquashfsDevice(Device, SquashfsMember):
# Example line:
# crw-r--r-- root/root 1, 3 2015-06-24 14:47 squashfs-root/null
LINE_RE = re.compile(
r'^(?P<kind>c|b)\S+\s+\S+\s+(?P<major>\d+),\s*(?P<minor>\d+)\s+\S+\s+\S+\s+(?P<member_name>.*)$',
)
KIND_MAP = {
'c': stat.S_IFCHR,
'b': stat.S_IFBLK,
}
@staticmethod
def parse(line):
m = SquashfsDevice.LINE_RE.match(line)
if not m:
raise SquashfsInvalidLineFormat("invalid line format")
d = m.groupdict()
try:
d['mode'] = SquashfsDevice.KIND_MAP[d['kind']]
del d['kind']
except KeyError:
raise SquashfsInvalidLineFormat("unknown device kind %s" % d['kind'])
try:
d['major'] = int(d['major'])
except ValueError:
raise SquashfsInvalidLineFormat(
"unable to parse major number %s" % d['major'],
)
try:
d['minor'] = int(d['minor'])
except ValueError:
raise SquashfsInvalidLineFormat(
"unable to parse minor number %s" % d['minor'],
)
return d
def __init__(self, archive, member_name, mode, major, minor):
SquashfsMember.__init__(self, archive, member_name)
self._mode = mode
self._major = major
self._minor = minor
def get_device(self):
return (self._mode, self._major, self._minor)
def is_device(self):
return True
class SquashfsContainer(Archive):
auto_diff_metadata = False
MEMBER_CLASS = {
'd': SquashfsDirectory,
'l': SquashfsSymlink,
'c': SquashfsDevice,
'b': SquashfsDevice,
'-': SquashfsRegularFile
}
def open_archive(self):
return True
def close_archive(self):
pass
def get_member(self, member_name):
self.ensure_unpacked()
cls, kwargs = self._members[member_name]
return cls(self, member_name, **kwargs)
def extract(self, member_name, destdir):
# Ignore destdir argument and use our unpacked path
self.ensure_unpacked()
return member_name
def get_member_names(self):
self.ensure_unpacked()
return self._members.keys()
def ensure_unpacked(self):
if hasattr(self, '_members'):
return
self._members = collections.OrderedDict()
self._temp_dir = get_temporary_directory().name
logger.debug("Extracting %s to %s", self.source.path, self._temp_dir)
output = subprocess.check_output((
'unsquashfs',
'-n',
'-f',
'-no',
'-li',
'-d', '.',
self.source.path,
), stderr=subprocess.PIPE, cwd=self._temp_dir)
output = iter(output.decode('utf-8').rstrip('\n').split('\n'))
# Skip headers
for _ in iter(functools.partial(next, output), ''):
pass
for line in output:
if not line:
continue
try:
cls = self.MEMBER_CLASS[line[0]]
except KeyError:
logger.debug("Unknown squashfs entry: %s", line)
continue
try:
kwargs = cls.parse(line)
except SquashfsInvalidLineFormat:
continue
# Pop to avoid duplicating member name in the key and the value
member_name = kwargs.pop('member_name')
self._members[member_name] = (cls, kwargs)
logger.debug(
"Extracted %d entries from %s to %s",
len(self._members), self.source.path, self._temp_dir,
)
class SquashfsFile(File):
DESCRIPTION = "SquashFS filesystems"
CONTAINER_CLASS = SquashfsContainer
FILE_TYPE_RE = re.compile(r'^Squashfs filesystem\b')
def compare_details(self, other, source=None):
return [
Difference.from_command(SquashfsSuperblock, self.path, other.path),
Difference.from_command(SquashfsListing, self.path, other.path),
]
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