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# Copyright (c) 2022 Marcus Schäfer. All rights reserved.
#
# This file is part of kiwi.
#
# kiwi 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.
#
# kiwi 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 kiwi. If not, see <http://www.gnu.org/licenses/>
#
import os
import logging
from typing import (
List, Dict, Optional, Union
)
# project
from kiwi.defaults import Defaults
from kiwi.mount_manager import MountManager
from kiwi.storage.disk import ptable_entry_type
from kiwi.volume_manager.base import VolumeManagerBase
from kiwi.filesystem.base import FileSystemBase
log = logging.getLogger('kiwi')
class ImageSystem:
"""
**Access the target image from the block layer**
"""
def __init__(
self, device_map: Dict, root_dir: str,
volume_manager: Optional[Union[FileSystemBase, VolumeManagerBase]] = None,
partitions: Dict[str, ptable_entry_type] = {}
) -> None:
"""
Construct a new ImageSystem object
:param dict device_map: Block device map
:param str root_dir: Path to unpacked image root tree
:param VolumeManagerBase volume_manager:
Optional VolumeManager instance
"""
self.arch = Defaults.get_platform_name()
self.device_map = device_map
self.root_dir = root_dir
self.volume_manager = volume_manager
self.partitions = partitions
self.mount_list: List[MountManager] = []
self.root_mount_mountpoint = ''
def __enter__(self):
return self
def mountpoint(self) -> str:
"""
Return image root mountpoint
:return: mountpoint path or empty string
:rtype: str
"""
return self.root_mount_mountpoint
def mount(self) -> None:
"""
Mount image system from current block layers
"""
# mount root boot and efi devices as they are present
(root_device, boot_device, efi_device) = self._setup_device_names()
if self.volume_manager:
self.volume_manager.mount_volumes()
self.root_mount_mountpoint = \
self.volume_manager.get_mountpoint() or ''
else:
root_mount = MountManager(device=root_device)
self.mount_list.append(root_mount)
root_mount.mount()
self.root_mount_mountpoint = root_mount.mountpoint
if 's390' in self.arch:
boot_mount = MountManager(
device=boot_device, mountpoint=os.path.join(
self.root_mount_mountpoint, 'boot', 'zipl'
)
)
else:
boot_mount = MountManager(
device=boot_device, mountpoint=os.path.join(
self.root_mount_mountpoint, 'boot'
)
)
if efi_device:
efi_mount = MountManager(
device=efi_device, mountpoint=os.path.join(
self.root_mount_mountpoint, 'boot', 'efi'
)
)
if root_device != boot_device:
self.mount_list.append(boot_mount)
boot_mount.mount()
if efi_device:
self.mount_list.append(efi_mount)
efi_mount.mount()
if self.partitions:
for map_name in sorted(self.partitions.keys()):
if map_name in self.device_map:
partition_mount = MountManager(
device=self.device_map[map_name].get_device(),
mountpoint=os.path.join(
self.root_mount_mountpoint,
self.partitions[map_name].mountpoint.lstrip(os.sep)
)
)
self.mount_list.append(partition_mount)
partition_mount.mount()
# bind mount /image from unpacked root to get access to e.g scripts
image_mount = MountManager(
device=os.path.join(self.root_dir, 'image'),
mountpoint=os.path.join(
self.root_mount_mountpoint, 'image'
)
)
self.mount_list.append(image_mount)
image_mount.bind_mount()
# mount tmp as tmpfs
tmp_mount = MountManager(
device='tmpfs', mountpoint=os.path.join(
self.root_mount_mountpoint, 'tmp'
)
)
self.mount_list.append(tmp_mount)
tmp_mount.tmpfs_mount()
# mount var/tmp as tmpfs
var_tmp_mount = MountManager(
device='tmpfs', mountpoint=os.path.join(
self.root_mount_mountpoint, 'var', 'tmp'
)
)
self.mount_list.append(var_tmp_mount)
var_tmp_mount.tmpfs_mount()
# mount kernel interfaces as bind
for location in ('proc', 'sys', 'dev'):
shared_mount = MountManager(
device=os.path.join('/', location), mountpoint=os.path.join(
self.root_mount_mountpoint, location
)
)
self.mount_list.append(shared_mount)
shared_mount.bind_mount()
def umount(self) -> None:
"""
Umount all elements of mount_list in reverse order
"""
for mount in reversed(self.mount_list):
if mount.is_mounted():
mount.umount()
if self.volume_manager:
self.volume_manager.umount_volumes()
def _setup_device_names(self) -> tuple:
root_device = self.device_map['root'].get_device()
boot_device = root_device
efi_device = ''
if 'readonly' in self.device_map:
root_device = self.device_map['readonly'].get_device()
boot_device = root_device
if 'boot' in self.device_map:
boot_device = self.device_map['boot'].get_device()
if 'efi' in self.device_map:
efi_device = self.device_map['efi'].get_device()
return (root_device, boot_device, efi_device)
def __exit__(self, exc_type, exc_value, traceback):
self.umount()
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