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import multiprocessing
import shlex
from functools import cached_property
from importlib import import_module
from .. import process
from ..cli.exceptions import UserException
from ..process.spawn import spawn_get_output
class _transform_source:
def __init__(self, name):
self.name = name
@cached_property
def module(self):
return import_module(f'snakeoil.compression._{self.name}')
def compress_data(self, data, level, parallelize=False):
parallelize = parallelize and self.module.parallelizable
return self.module.compress_data(data, level, parallelize=parallelize)
def decompress_data(self, data, parallelize=False):
parallelize = parallelize and self.module.parallelizable
return self.module.decompress_data(data, parallelize=parallelize)
def compress_handle(self, handle, level, parallelize=False):
parallelize = parallelize and self.module.parallelizable
return self.module.compress_handle(handle, level, parallelize=parallelize)
def decompress_handle(self, handle, parallelize=False):
parallelize = parallelize and self.module.parallelizable
return self.module.decompress_handle(handle, parallelize=parallelize)
_transforms = {name: _transform_source(name) for name in ('bzip2', 'xz')}
def compress_data(compressor_type, data, level=9, **kwds):
return _transforms[compressor_type].compress_data(data, level, **kwds)
def decompress_data(compressor_type, data, **kwds):
return _transforms[compressor_type].decompress_data(data, **kwds)
def compress_handle(compressor_type, handle, level=9, **kwds):
return _transforms[compressor_type].compress_handle(handle, level, **kwds)
def decompress_handle(compressor_type, source, **kwds):
return _transforms[compressor_type].decompress_handle(source, **kwds)
class ArCompError(UserException):
"""Generic archive and compressed file error."""
def __init__(self, msg, code=-1):
super().__init__(msg)
self.code = code
class ArComp:
"""Generic archive and compressed file format support."""
binary = None
default_unpack_cmd = None
known_exts = {}
def __new__(cls, *args, ext, **kwargs):
try:
cls = cls.known_exts[ext]
return super(ArComp, cls).__new__(cls)
except KeyError:
raise ArCompError(f'unknown compression file extension: {ext!r}')
def __init_subclass__(cls, **kwargs):
"""Initialize result subclasses and register archive extensions."""
super().__init_subclass__(**kwargs)
if not all((cls.binary, cls.default_unpack_cmd, cls.exts)): # pragma: no cover
raise ValueError(f'class missing required attrs: {cls!r}')
for ext in cls.exts:
cls.known_exts[ext] = cls
def __init__(self, path, ext=None):
self.path = path
@cached_property
def _unpack_cmd(self):
for b in self.binary:
try:
binary = process.find_binary(b)
break
except process.CommandNotFound:
continue
else:
choices = ', '.join(self.binary)
raise ArCompError(
f'required binary not found from the following choices: {choices}')
cmd = self.default_unpack_cmd.format(binary=binary, path=self.path)
return cmd
def unpack(self, dest=None, **kwargs):
raise NotImplementedError
class _Archive:
"""Generic archive format support."""
def unpack(self, dest=None, **kwargs):
cmd = shlex.split(self._unpack_cmd.format(path=self.path))
ret, output = spawn_get_output(cmd, collect_fds=(2,), **kwargs)
if ret:
msg = '\n'.join(output) if output else f'unpacking failed: {self.path!r}'
raise ArCompError(msg, code=ret)
class _CompressedFile:
"""Single compressed file."""
def unpack(self, dest=None, **kwargs):
cmd = shlex.split(self._unpack_cmd.format(path=self.path))
with open(dest, 'wb') as f:
ret, output = spawn_get_output(
cmd, collect_fds=(2,), fd_pipes={1: f.fileno()}, **kwargs)
if ret:
msg = '\n'.join(output) if output else f'unpacking failed: {self.path!r}'
raise ArCompError(msg, code=ret)
class _CompressedStdin:
"""Compressed data from stdin."""
def unpack(self, dest=None, **kwargs):
cmd = shlex.split(self._unpack_cmd)
with open(self.path, 'rb') as src, open(dest, 'wb') as f:
ret, output = spawn_get_output(
cmd, collect_fds=(2,), fd_pipes={0: src.fileno(), 1: f.fileno()}, **kwargs)
if ret:
msg = '\n'.join(output) if output else f'unpacking failed: {self.path!r}'
raise ArCompError(msg, code=ret)
class _Tar(_Archive, ArComp):
exts = frozenset(['.tar'])
binary = ('gtar', 'tar',)
compress_binary = None
default_unpack_cmd = '{binary} xf "{path}"'
@cached_property
def _unpack_cmd(self):
cmd = super()._unpack_cmd
if self.compress_binary is not None:
for b in self.compress_binary:
try:
process.find_binary(b[0])
# FIXME: This is a gnuism, needs gnu tar.
cmd += f' --use-compress-program="{" ".join(b)}"'
break
except process.CommandNotFound:
pass
else:
choices = ', '.join(next(zip(*self.compress_binary)))
raise ArCompError(
'no compression binary found from the '
f'following choices: {choices}')
return cmd
class _TarGZ(_Tar):
exts = frozenset(['.tar.gz', '.tgz', '.tar.Z', '.tar.z'])
compress_binary = (('pigz',), ('gzip',))
class _TarBZ2(_Tar):
exts = frozenset(['.tar.bz2', '.tbz2', '.tbz'])
compress_binary = (('lbzip2',), ('pbzip2',), ('bzip2',))
class _TarLZMA(_Tar):
exts = frozenset(['.tar.lzma'])
compress_binary = (('lzma',))
class _TarXZ(_Tar):
exts = frozenset(['.tar.xz', '.txz'])
compress_binary = (('pixz',), ('xz', f'-T{multiprocessing.cpu_count()}'))
class _Zip(_Archive, ArComp):
exts = frozenset(['.ZIP', '.zip', '.jar'])
binary = ('unzip',)
default_unpack_cmd = '{binary} -qo "{path}"'
class _GZ(_CompressedStdin, ArComp):
exts = frozenset(['.gz', '.Z', '.z'])
binary = ('pigz', 'gzip')
default_unpack_cmd = '{binary} -d -c'
class _BZ2(_CompressedStdin, ArComp):
exts = frozenset(['.bz2', '.bz'])
binary = ('lbzip2', 'pbzip2', 'bzip2')
default_unpack_cmd = '{binary} -d -c'
class _XZ(_CompressedStdin, ArComp):
exts = frozenset(['.xz'])
binary = ('pixz', 'xz')
default_unpack_cmd = '{binary} -d -c'
class _7Z(_Archive, ArComp):
exts = frozenset(['.7Z', '.7z'])
binary = ('7z',)
default_unpack_cmd = '{binary} x -y "{path}"'
class _Rar(_Archive, ArComp):
exts = frozenset(['.RAR', '.rar'])
binary = ('unrar',)
default_unpack_cmd = '{binary} x -idq -o+ "{path}"'
class _LHA(_Archive, ArComp):
exts = frozenset(['.LHa', '.LHA', '.lha', '.lzh'])
binary = ('lha',)
default_unpack_cmd = '{binary} xfq "{path}"'
class _Ar(_Archive, ArComp):
exts = frozenset(['.a', '.deb'])
binary = ('ar',)
default_unpack_cmd = '{binary} x "{path}"'
class _LZMA(_CompressedFile, ArComp):
exts = frozenset(['.lzma'])
binary = ('lzma',)
default_unpack_cmd = '{binary} -dc "{path}"'
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