How to use is_lzma_file method in avocado

Best Python code snippet using avocado_python

archive.py

Source:archive.py

...47                if not chunk:48                    break49                output_file.write(chunk)50        return output_path51def is_lzma_file(path):52    """53    Checks if file given by path has contents that suggests lzma file54    """55    with lzma.LZMAFile(path, 'rb') as lzma_file:56        try:57            _ = lzma_file.read(1)58        except lzma.LZMAError:59            return False60        except EOFError:61            return False62    return True63def lzma_uncompress(path, output_path=None, force=False):64    """65    Extracts a XZ compressed file to the same directory.66    """67    if output_path is None:68        output_path = os.path.splitext(path)[0]69    elif os.path.isdir(output_path):70        basename = os.path.basename(path)71        if basename.endswith('.xz'):72            basename = os.path.splitext(basename)[0]73        output_path = os.path.join(output_path, basename)74    if not force and os.path.exists(output_path):75        return output_path76    with lzma.open(path, 'rb') as file_obj:77        with open(output_path, 'wb') as newfile_obj:78            newfile_obj.write(file_obj.read())79    return output_path80class ArchiveException(Exception):81    """82    Base exception for all archive errors.83    """84class ArchiveFile:85    """86    Class that represents an Archive file.87    Archives are ZIP files or Tarballs.88    """89    # extension info: is_zip, is_tar, zipfile|tarfile, +mode90    _extension_table = {91        '.zip': (True, False, zipfile.ZipFile, ''),92        '.tar': (False, True, tarfile.open, ''),93        '.tar.gz': (False, True, tarfile.open, ':gz'),94        '.tgz': (False, True, tarfile.open, ':gz'),95        '.tar.bz2': (False, True, tarfile.open, ':bz2'),96        '.tbz2': (False, True, tarfile.open, ':bz2'),97        '.xz': (False, True, tarfile.open, ':xz')}98    def __init__(self, filename, mode='r'):99        """100        Creates an instance of :class:`ArchiveFile`.101        :param filename: the archive file name.102        :param mode: file mode, `r` read, `w` write.103        """104        self.filename = filename105        self.mode = mode106        engine = None107        for ext, value in ArchiveFile._extension_table.items():108            if filename.endswith(ext):109                (self.is_zip,110                 self.is_tar,111                 engine,112                 extra_mode) = value113        if engine is not None:114            self.mode += extra_mode115            self._engine = engine(self.filename, self.mode)116        else:117            raise ArchiveException('file is not an archive')118    def __repr__(self):119        return "ArchiveFile('%s', '%s')" % (self.filename, self.mode)120    def __enter__(self):121        return self122    def __exit__(self, exc_type, exc_value, exc_traceback):123        if self._engine is not None:124            self.close()125    @classmethod126    def open(cls, filename, mode='r'):127        """128        Creates an instance of :class:`ArchiveFile`.129        :param filename: the archive file name.130        :param mode: file mode, `r` read, `w` write.131        """132        return cls(filename, mode)133    def add(self, filename, arcname=None):134        """135        Add file to the archive.136        :param filename: file to archive.137        :param arcname: alternative name for the file in the archive.138        """139        if self.is_zip:140            self._engine.write(filename, arcname, zipfile.ZIP_DEFLATED)141        else:142            self._engine.add(filename, arcname)143    def list(self):144        """145        List files to the standard output.146        """147        if self.is_zip:148            self._engine.printdir()149        else:150            self._engine.list()151    def extract(self, path='.'):152        """153        Extract all files from the archive.154        :param path: destination path.155        :return: the first member of the archive, a file or directory or None156                 if the archive is empty157        """158        self._engine.extractall(path)159        if self.is_zip:160            self._update_zip_extra_attrs(path)161            files = self._engine.namelist()162            if files:163                return files[0].strip(os.sep)164            else:165                return None166        files = self._engine.getnames()167        if files:168            return files[0]169        return None170    def _update_zip_extra_attrs(self, dst_dir):171        if platform.system() != "Linux":172            LOG.warning("Attr handling in zip files only supported on Linux.")173            return174        # Walk all files and re-create files as symlinks175        for path, info in self._engine.NameToInfo.items():176            dst = os.path.join(dst_dir, path)177            if not os.path.exists(dst):178                LOG.warning("One or more files in the ZIP archive '%s' could "179                            "not be found after extraction. Their paths are "180                            "probably stored in unsupported format and their "181                            "attributes are not going to be updated",182                            self.filename)183                return184            attr = info.external_attr >> 16185            if attr & stat.S_IFLNK == stat.S_IFLNK:186                dst = os.path.join(dst_dir, path)187                if not os.path.islink(dst):188                    # Link created as an ordinary file containing the dst path189                    with open(dst, 'r') as dst_path:  # pylint: disable=W1514190                        src = dst_path.read()191                else:192                    # Link is already there and could be outdated. Let's read193                    # the original destination from the zip file.194                    src = self._engine.read(path)195                os.remove(dst)196                os.symlink(src, dst)197                continue    # Don't override any other attributes on links198            mode = attr & 511   # Mask only permissions199            if mode and mode != 436:  # If mode is stored and is not default200                os.chmod(dst, mode)201    def close(self):202        """203        Close archive.204        """205        self._engine.close()206def is_archive(filename):207    """208    Test if a given file is an archive.209    :param filename: file to test.210    :return: `True` if it is an archive.211    """212    return (zipfile.is_zipfile(filename) or tarfile.is_tarfile(filename) or213            is_gzip_file(filename) or is_lzma_file(filename))214def compress(filename, path):215    """216    Compress files in an archive.217    :param filename: archive file name.218    :param path: origin directory path to files to compress. No219                 individual files allowed.220    """221    with ArchiveFile.open(filename, 'w') as x:222        if os.path.isdir(path):223            for root, _, files in os.walk(path):224                for name in files:225                    newroot = root.replace(path, '')226                    x.add(os.path.join(root, name),227                          os.path.join(newroot, name))228        elif os.path.isfile(path):229            x.add(path, os.path.basename(path))230def uncompress(filename, path):231    """232    Extract files from an archive.233    :param filename: archive file name.234    :param path: destination path to extract to.235    """236    is_tar = tarfile.is_tarfile(filename)237    if is_gzip_file(filename) and not is_tar:238        return gzip_uncompress(filename, path)239    elif is_lzma_file(filename) and not is_tar:240        return lzma_uncompress(filename, path)241    else:242        with ArchiveFile.open(filename) as x:243            return x.extract(path)244# Some aliases245create = compress...

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