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import glob
import pathlib
import logging
import json
from dataclasses import dataclass
from typing import Optional, List, Dict, Any, Iterator, TYPE_CHECKING
from ..exceptions import SysCallError
from ..general import SysCommand
from ..output import log
if TYPE_CHECKING:
from .btrfs import BtrfsSubvolume
@dataclass
class MapperDev:
mappername :str
@property
def name(self):
return self.mappername
@property
def path(self):
return f"/dev/mapper/{self.mappername}"
@property
def partition(self):
from .helpers import uevent, get_parent_of_partition
from .partition import Partition
from .blockdevice import BlockDevice
for mapper in glob.glob('/dev/mapper/*'):
path_obj = pathlib.Path(mapper)
if path_obj.name == self.mappername and pathlib.Path(mapper).is_symlink():
dm_device = (pathlib.Path("/dev/mapper/") / path_obj.readlink()).resolve()
for slave in glob.glob(f"/sys/class/block/{dm_device.name}/slaves/*"):
partition_belonging_to_dmcrypt_device = pathlib.Path(slave).name
try:
uevent_data = SysCommand(f"blkid -o export /dev/{partition_belonging_to_dmcrypt_device}").decode()
except SysCallError as error:
log(f"Could not get information on device /dev/{partition_belonging_to_dmcrypt_device}: {error}", level=logging.ERROR, fg="red")
information = uevent(uevent_data)
block_device = BlockDevice(get_parent_of_partition('/dev/' / pathlib.Path(information['DEVNAME'])))
return Partition(information['DEVNAME'], block_device=block_device)
raise ValueError(f"Could not convert {self.mappername} to a real dm-crypt device")
@property
def mountpoint(self) -> Optional[pathlib.Path]:
try:
data = json.loads(SysCommand(f"findmnt --json -R {self.path}").decode())
for filesystem in data['filesystems']:
return pathlib.Path(filesystem.get('target'))
except SysCallError as error:
# Not mounted anywhere most likely
log(f"Could not locate mount information for {self.path}: {error}", level=logging.WARNING, fg="yellow")
pass
return None
@property
def mount_information(self) -> List[Dict[str, Any]]:
from .helpers import find_mountpoint
return list(find_mountpoint(self.path))
@property
def filesystem(self) -> Optional[str]:
from .helpers import get_filesystem_type
return get_filesystem_type(self.path)
@property
def subvolumes(self) -> Iterator['BtrfsSubvolume']:
from .btrfs import subvolume_info_from_path
for mountpoint in self.mount_information:
if target := mountpoint.get('target'):
if subvolume := subvolume_info_from_path(pathlib.Path(target)):
yield subvolume
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