# -*- coding: utf-8 -*-
"""The EXT file entry implementation."""
from dfdatetime import posix_time as dfdatetime_posix_time
from dfvfs.lib import definitions
from dfvfs.lib import errors
from dfvfs.path import ext_path_spec
from dfvfs.vfs import attribute
from dfvfs.vfs import ext_attribute
from dfvfs.vfs import ext_directory
from dfvfs.vfs import extent
from dfvfs.vfs import file_entry
[docs]
class EXTFileEntry(file_entry.FileEntry):
"""File system file entry that uses pyfsext."""
TYPE_INDICATOR = definitions.TYPE_INDICATOR_EXT
# Mappings of EXT file types to dfVFS file entry types.
_ENTRY_TYPES = {
0x1000: definitions.FILE_ENTRY_TYPE_PIPE,
0x2000: definitions.FILE_ENTRY_TYPE_CHARACTER_DEVICE,
0x4000: definitions.FILE_ENTRY_TYPE_DIRECTORY,
0x6000: definitions.FILE_ENTRY_TYPE_BLOCK_DEVICE,
0x8000: definitions.FILE_ENTRY_TYPE_FILE,
0xa000: definitions.FILE_ENTRY_TYPE_LINK,
0xc000: definitions.FILE_ENTRY_TYPE_SOCKET}
_NANOSECONDS_PER_SECOND = 1000000000
[docs]
def __init__(
self, resolver_context, file_system, path_spec, fsext_file_entry=None,
is_root=False, is_virtual=False):
"""Initializes a file entry.
Args:
resolver_context (Context): resolver context.
file_system (FileSystem): file system.
path_spec (PathSpec): path specification.
fsext_file_entry (Optional[pyfsext.file_entry]): EXT file entry.
is_root (Optional[bool]): True if the file entry is the root file entry
of the corresponding file system.
is_virtual (Optional[bool]): True if the file entry is a virtual file
entry emulated by the corresponding file system.
Raises:
BackEndError: if the pyfsext file entry is missing.
"""
if not fsext_file_entry:
fsext_file_entry = file_system.GetEXTFileEntryByPathSpec(path_spec)
if not fsext_file_entry:
raise errors.BackEndError('Missing pyfsext file entry.')
if is_root:
file_entry_name = ''
else:
file_entry_name = fsext_file_entry.name
# Use the path specification location to determine the file entry name
# if the file entry was retrieved by inode.
if file_entry_name is None:
location = getattr(path_spec, 'location', None)
if location:
location_segments = file_system.SplitPath(location)
if location_segments:
file_entry_name = location_segments[-1]
super(EXTFileEntry, self).__init__(
resolver_context, file_system, path_spec, is_root=is_root,
is_virtual=is_virtual)
self._creation_time = fsext_file_entry.get_creation_time_as_integer()
self._fsext_file_entry = fsext_file_entry
self._name = file_entry_name
self.entry_type = self._ENTRY_TYPES.get(
fsext_file_entry.file_mode & 0xf000, None)
def _GetAttributes(self):
"""Retrieves the attributes.
Returns:
list[Attribute]: attributes.
"""
if self._attributes is None:
self._attributes = []
for fsext_extended_attribute in (
self._fsext_file_entry.extended_attributes):
extended_attribute = ext_attribute.EXTExtendedAttribute(
fsext_extended_attribute)
self._attributes.append(extended_attribute)
return self._attributes
def _GetDirectory(self):
"""Retrieves a directory.
Returns:
EXTDirectory: directory or None if not available.
"""
if self.entry_type != definitions.FILE_ENTRY_TYPE_DIRECTORY:
return None
return ext_directory.EXTDirectory(
self._file_system, self.path_spec, self._fsext_file_entry)
def _GetLink(self):
"""Retrieves the link.
Returns:
str: path of the linked file.
"""
if self._link is None:
self._link = self._fsext_file_entry.symbolic_link_target
if self._link and self._link[0] != self._file_system.PATH_SEPARATOR:
# TODO: make link absolute.
self._link = f'/{self._link:s}'
return self._link
def _GetStatAttribute(self):
"""Retrieves a stat attribute.
Returns:
StatAttribute: a stat attribute or None if not available.
"""
stat_attribute = attribute.StatAttribute()
stat_attribute.device_number = self._fsext_file_entry.device_number
stat_attribute.group_identifier = self._fsext_file_entry.group_identifier
stat_attribute.inode_number = self._fsext_file_entry.inode_number
stat_attribute.mode = self._fsext_file_entry.file_mode
stat_attribute.number_of_links = self._fsext_file_entry.number_of_links
stat_attribute.owner_identifier = self._fsext_file_entry.owner_identifier
stat_attribute.size = self._fsext_file_entry.size
stat_attribute.type = self.entry_type
return stat_attribute
def _GetSubFileEntries(self):
"""Retrieves a sub file entries generator.
Yields:
EXTFileEntry: a sub file entry.
"""
if self._directory is None:
self._directory = self._GetDirectory()
if self._directory:
for path_spec in self._directory.entries:
yield EXTFileEntry(self._resolver_context, self._file_system, path_spec)
@property
def access_time(self):
"""dfdatetime.DateTimeValues: access time or None if not available."""
timestamp = self._fsext_file_entry.get_access_time_as_integer()
# If creation time is not present (None) the timestamp precision is in
# seconds.
if self._creation_time is None:
timestamp, _ = divmod(timestamp, self._NANOSECONDS_PER_SECOND)
return dfdatetime_posix_time.PosixTime(timestamp=timestamp)
return dfdatetime_posix_time.PosixTimeInNanoseconds(timestamp=timestamp)
@property
def change_time(self):
"""dfdatetime.DateTimeValues: change time or None if not available."""
timestamp = self._fsext_file_entry.get_inode_change_time_as_integer()
# If creation time is not present (None) the timestamp precision is in
# seconds.
if self._creation_time is None:
timestamp, _ = divmod(timestamp, self._NANOSECONDS_PER_SECOND)
return dfdatetime_posix_time.PosixTime(timestamp=timestamp)
return dfdatetime_posix_time.PosixTimeInNanoseconds(timestamp=timestamp)
@property
def creation_time(self):
"""dfdatetime.DateTimeValues: creation time or None if not available."""
# Creation time can be None if not present and 0 if not set.
if not self._creation_time:
return None
return dfdatetime_posix_time.PosixTimeInNanoseconds(
timestamp=self._creation_time)
@property
def deletion_time(self):
"""dfdatetime.DateTimeValues: deletion time or None if not available."""
timestamp = self._fsext_file_entry.get_deletion_time_as_integer()
# Deletion time can be 0 if not set.
if not timestamp:
return None
return dfdatetime_posix_time.PosixTime(timestamp=timestamp)
@property
def name(self):
"""str: name of the file entry, which does not include the full path."""
return self._name
@property
def modification_time(self):
"""dfdatetime.DateTimeValues: modification time or None if not available."""
timestamp = self._fsext_file_entry.get_modification_time_as_integer()
# If creation time is not present (None) the timestamp precision is in
# seconds.
if self._creation_time is None:
timestamp, _ = divmod(timestamp, self._NANOSECONDS_PER_SECOND)
return dfdatetime_posix_time.PosixTime(timestamp=timestamp)
return dfdatetime_posix_time.PosixTimeInNanoseconds(timestamp=timestamp)
@property
def size(self):
"""int: size of the file entry in bytes or None if not available."""
return self._fsext_file_entry.size
[docs]
def GetExtents(self):
"""Retrieves the extents.
Returns:
list[Extent]: the extents.
"""
if self.entry_type != definitions.FILE_ENTRY_TYPE_FILE:
return []
extents = []
for extent_index in range(self._fsext_file_entry.number_of_extents):
extent_offset, extent_size, extent_flags = (
self._fsext_file_entry.get_extent(extent_index))
if extent_flags & 0x1:
extent_type = definitions.EXTENT_TYPE_SPARSE
else:
extent_type = definitions.EXTENT_TYPE_DATA
data_stream_extent = extent.Extent(
extent_type=extent_type, offset=extent_offset, size=extent_size)
extents.append(data_stream_extent)
return extents
[docs]
def GetEXTFileEntry(self):
"""Retrieves the EXT file entry.
Returns:
pyfsext.file_entry: EXT file entry.
"""
return self._fsext_file_entry
[docs]
def GetLinkedFileEntry(self):
"""Retrieves the linked file entry, e.g. for a symbolic link.
Returns:
EXTFileEntry: linked file entry or None if not available.
"""
link = self._GetLink()
if not link:
return None
parent_path_spec = getattr(self.path_spec, 'parent', None)
path_spec = ext_path_spec.EXTPathSpec(
location=link, parent=parent_path_spec)
is_root = bool(link == self._file_system.LOCATION_ROOT)
return EXTFileEntry(
self._resolver_context, self._file_system, path_spec, is_root=is_root)
[docs]
def GetParentFileEntry(self):
"""Retrieves the parent file entry.
Returns:
EXTFileEntry: parent file entry or None if not available.
"""
parent_location = None
location = getattr(self.path_spec, 'location', None)
if location is not None:
parent_location = self._file_system.DirnamePath(location)
if parent_location == '':
parent_location = self._file_system.PATH_SEPARATOR
parent_path_spec = getattr(self.path_spec, 'parent', None)
path_spec = ext_path_spec.EXTPathSpec(
location=parent_location, parent=parent_path_spec)
is_root = bool(parent_location == self._file_system.LOCATION_ROOT)
return EXTFileEntry(
self._resolver_context, self._file_system, path_spec, is_root=is_root)