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zj
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occupation_resolver.py
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317
occupation_resolver.py
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# occupation_resolver.py
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import logging
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import re
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from typing import List, Tuple, Callable, Optional
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# 假设 QApplication 和 QMessageBox 在主 UI 线程中可用，
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# 并且我们在这里直接使用它们进行用户交互。
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# 在更严格的架构中，UI交互应该通过回调或事件机制与核心逻辑分离。
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# from PyQt5.QtWidgets import QMessageBox
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from PySide6.QtWidgets import (QApplication, QMainWindow, QTreeWidgetItem,
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QMessageBox, QHeaderView, QMenu, QInputDialog, QDialog)
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logger = logging.getLogger(__name__)
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class OccupationResolver:
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"""
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负责检查和解除设备占用的类。
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处理包括内核挂载、嵌套挂载和用户进程占用等情况。
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"""
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def __init__(self, shell_executor_func: Callable, mount_info_getter_func: Callable):
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"""
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初始化设备占用解决器。
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Args:
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shell_executor_func: 一个可调用对象，用于执行 shell 命令。
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期望签名: (cmd: List[str], error_msg: str, show_dialog: bool,
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suppress_critical_dialog_on_stderr_match: Tuple,
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expected_non_zero_exit_codes: List[int]) -> Tuple[bool, str, str]
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mount_info_getter_func: 一个可调用对象，用于获取设备的挂载点。
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期望签名: (device_path: str) -> Optional[str]
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"""
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self._execute_shell_command = shell_executor_func
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self._get_mountpoint_for_device = mount_info_getter_func
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def _run_command(self, cmd: List[str], error_msg: str, **kwargs) -> Tuple[bool, str, str]:
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"""
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执行 shell 命令的包装器。
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"""
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return self._execute_shell_command(cmd, error_msg, **kwargs)
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def get_all_mounts_under_path(self, base_path: str) -> List[str]:
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"""
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获取指定路径下所有嵌套的挂载点。
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返回一个挂载点列表，从最深层到最浅层排序。
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"""
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mounts = []
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# 尝试使用 findmnt 命令更可靠地获取嵌套挂载信息
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# -l: 列出所有挂载
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# -o TARGET: 只输出目标路径
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# -n: 不显示标题行
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# -r: 原始输出，方便解析
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# --target <base_path>: 限制只查找 base_path 下的挂载
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# -t noautofs,nosnapfs,nofuse,nocifs,nonfs,notmpfs,nobind: 排除一些不相关的或虚拟的挂载
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findmnt_cmd = ["findmnt", "-l", "-o", "TARGET", "-n", "-r", "--target", base_path,
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"-t", "noautofs,nosnapfs,nofuse,nocifs,nonfs,notmpfs,nobind"]
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success, stdout, stderr = self._run_command(findmnt_cmd, f"获取 {base_path} 下的挂载信息失败", show_dialog=False)
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if not success:
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logger.warning(f"findmnt 命令失败，尝试解析 'mount' 命令输出: {stderr}")
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# 如果 findmnt 失败或不可用，则回退到解析 'mount' 命令输出
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success, stdout, stderr = self._run_command(["mount"], "获取挂载信息失败", show_dialog=False)
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if not success:
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logger.error(f"获取挂载信息失败: {stderr}")
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return []
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for line in stdout.splitlines():
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match = re.search(r' on (\S+) type ', line)
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if match:
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mount_point = match.group(1)
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# 确保是嵌套挂载点而不是基础挂载点本身
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if mount_point.startswith(base_path) and mount_point != base_path:
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mounts.append(mount_point)
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else:
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for line in stdout.splitlines():
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mount_point = line.strip()
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# findmnt --target 已经过滤了，这里只需确保不是空行
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if mount_point and mount_point.startswith(base_path) and mount_point != base_path:
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mounts.append(mount_point)
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# 排序：从最深层到最浅层，以便正确卸载。路径越长，通常越深层。
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mounts.sort(key=lambda x: len(x.split('/')), reverse=True)
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logger.debug(f"在 {base_path} 下找到的嵌套挂载点（从深到浅）: {mounts}")
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return mounts
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def _unmount_nested_mounts(self, base_mount_point: str) -> bool:
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"""
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尝试卸载指定基础挂载点下的所有嵌套挂载。
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"""
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nested_mounts = self.get_all_mounts_under_path(base_mount_point)
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if not nested_mounts:
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logger.debug(f"在 {base_mount_point} 下没有找到嵌套挂载点。")
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return True # 没有需要卸载的嵌套挂载
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logger.info(f"开始卸载 {base_mount_point} 下的嵌套挂载点: {nested_mounts}")
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all_nested_unmounted = True
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for mount_point in nested_mounts:
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if not self._unmount_target(mount_point):
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logger.error(f"未能卸载嵌套挂载点 {mount_point}。")
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all_nested_unmounted = False
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# 即使一个失败，也尝试卸载其他，但标记整体失败
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return all_nested_unmounted
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def _unmount_target(self, target_path: str) -> bool:
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"""
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尝试卸载一个目标（设备或挂载点）。
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先尝试普通卸载，如果失败则尝试强制卸载，再失败则尝试懒惰卸载。
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"""
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logger.info(f"尝试卸载 {target_path}。")
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success, stdout, stderr = self._run_command(
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["umount", target_path],
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f"卸载 {target_path} 失败",
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show_dialog=False,
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expected_non_zero_exit_codes=[1] # umount 返回 1 表示未挂载或忙碌
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)
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if success:
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logger.info(f"成功卸载 {target_path}。")
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return True
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else:
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# 检查是否因为未挂载而失败
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if "not mounted" in stderr.lower() or "未挂载" in stderr:
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logger.info(f"目标 {target_path} 未挂载，无需卸载。")
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return True
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logger.warning(f"卸载 {target_path} 失败: {stderr}")
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# 尝试强制卸载 -f
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logger.info(f"尝试强制卸载 {target_path} (umount -f)。")
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success_force, stdout_force, stderr_force = self._run_command(
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["umount", "-f", target_path],
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f"强制卸载 {target_path} 失败",
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show_dialog=False,
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expected_non_zero_exit_codes=[1]
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)
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if success_force:
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logger.info(f"成功强制卸载 {target_path}。")
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return True
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else:
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logger.warning(f"强制卸载 {target_path} 失败: {stderr_force}")
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# 尝试懒惰卸载 -l
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logger.info(f"尝试懒惰卸载 {target_path} (umount -l)。")
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success_lazy, stdout_lazy, stderr_lazy = self._run_command(
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["umount", "-l", target_path],
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f"懒惰卸载 {target_path} 失败",
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show_dialog=False,
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expected_non_zero_exit_codes=[1]
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)
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if success_lazy:
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logger.info(f"成功懒惰卸载 {target_path}。")
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return True
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else:
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logger.error(f"懒惰卸载 {target_path} 失败: {stderr_lazy}")
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return False
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def _kill_pids(self, pids: List[str]) -> bool:
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"""
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终止指定PID的进程。
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"""
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all_killed = True
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for pid in pids:
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logger.info(f"尝试终止进程 {pid}。")
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kill_success, _, kill_stderr = self._run_command(
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["kill", "-9", pid],
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f"终止进程 {pid} 失败",
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show_dialog=False # UI 交互在更高层处理
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)
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if not kill_success:
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logger.error(f"终止进程 {pid} 失败: {kill_stderr}")
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all_killed = False
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else:
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logger.info(f"成功终止进程 {pid}。")
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return all_killed
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def resolve_occupation(self, device_path: str) -> bool:
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"""
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尝试解除设备占用，包括处理嵌套挂载和终止进程。
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返回 True 如果成功解除占用，否则返回 False。
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"""
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logger.info(f"开始尝试解除设备 {device_path} 的占用。")
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# 1. 获取设备的当前主挂载点
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main_mount_point = self._get_mountpoint_for_device(device_path)
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# 2. 如果设备有主挂载点，先尝试卸载所有嵌套挂载
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if main_mount_point and main_mount_point != 'N/A' and main_mount_point != '[SWAP]':
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logger.debug(f"设备 {device_path} 的主挂载点是 {main_mount_point}。")
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max_unmount_attempts = 3
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for attempt in range(max_unmount_attempts):
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logger.info(f"尝试卸载嵌套挂载点 (第 {attempt + 1} 次尝试)。")
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if self._unmount_nested_mounts(main_mount_point):
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logger.info(f"所有嵌套挂载点已成功卸载或已不存在。")
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break
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else:
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logger.warning(f"卸载嵌套挂载点失败 (第 {attempt + 1} 次尝试)，可能需要重试。")
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if attempt == max_unmount_attempts - 1:
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QMessageBox.critical(None, "错误", f"未能卸载设备 {device_path} 下的所有嵌套挂载点。")
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return False
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# 尝试卸载主挂载点本身
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logger.info(f"尝试卸载主挂载点 {main_mount_point}。")
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if self._unmount_target(main_mount_point):
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QMessageBox.information(None, "成功", f"设备 {device_path} 及其所有挂载点已成功卸载。")
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return True # 主挂载点已卸载，设备应该已空闲
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# 3. 检查设备本身或其（可能已不存在的）主挂载点是否仍被占用 (fuser)
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fuser_targets = [device_path]
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if main_mount_point and main_mount_point != 'N/A' and main_mount_point != '[SWAP]' and main_mount_point not in fuser_targets:
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fuser_targets.append(main_mount_point)
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pids_to_kill = set()
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kernel_mounts_found = False
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occupation_info_lines = []
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for target in fuser_targets:
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logger.debug(f"执行 fuser -vm {target} 检查占用。")
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success_fuser, stdout_fuser, stderr_fuser = self._run_command(
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["fuser", "-vm", target],
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f"检查 {target} 占用失败",
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show_dialog=False,
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suppress_critical_dialog_on_stderr_match=(
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"No such file or directory", "not found", "Usage:", "not mounted"
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),
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expected_non_zero_exit_codes=[1]
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)
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if success_fuser and stdout_fuser:
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logger.debug(f"fuser -vm {target} 输出:\n{stdout_fuser}")
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for line in stdout_fuser.splitlines():
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line = line.strip() # 清除行首尾空白
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if not line: # 跳过空行
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continue
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# 收集所有非空行用于最终显示
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occupation_info_lines.append(line)
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# 检查是否包含 "kernel" 关键字
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if "kernel" in line:
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kernel_mounts_found = True
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# 尝试从详细格式的行中提取 PID (例如: /dev/sda2: root 42032 .rce. gpg-agent)
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match_verbose = re.match(r'^\S+:\s+\S+\s+(?P<id>\d+)\s+.*', line)
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if match_verbose:
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pids_to_kill.add(match_verbose.group('id'))
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else:
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# 如果不是详细格式，检查是否是纯数字 PID (例如: 42032)
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# 这种情况下，fuser -vm 可能只输出了 PID
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if line.isdigit():
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pids_to_kill.add(line)
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pids_to_kill_list = list(pids_to_kill)
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if not kernel_mounts_found and not pids_to_kill_list:
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QMessageBox.information(None, "信息", f"设备 {device_path} 未被任何进程占用。")
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logger.info(f"设备 {device_path} 未被任何进程占用。")
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return True
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# 4. 处理剩余的内核挂载（如果嵌套挂载和主挂载卸载失败，这里会再次捕捉到）
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if kernel_mounts_found:
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process_list_str = "\n".join(sorted(list(set(occupation_info_lines))))
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reply = QMessageBox.question(
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None,
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"设备占用 - 内核挂载",
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f"设备 {device_path} 仍被内核挂载占用：\n{process_list_str}\n\n您确定要尝试卸载此设备吗？",
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QMessageBox.Yes | QMessageBox.No,
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QMessageBox.No
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)
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if reply == QMessageBox.No:
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logger.info(f"用户取消了卸载设备 {device_path}。")
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QMessageBox.information(None, "信息", f"已取消卸载设备 {device_path}。")
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return False
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logger.info(f"再次尝试卸载设备 {device_path}。")
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if self._unmount_target(device_path): # 尝试直接卸载设备路径
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QMessageBox.information(None, "成功", f"设备 {device_path} 已成功卸载。")
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return True
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else:
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QMessageBox.critical(None, "错误", f"未能卸载设备 {device_path}。")
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return False
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# 5. 处理用户进程占用
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if pids_to_kill_list:
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process_list_str = "\n".join(sorted(list(set(occupation_info_lines))))
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reply = QMessageBox.question(
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None,
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"设备占用 - 进程",
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f"设备 {device_path} 正在被以下进程占用：\n{process_list_str}\n\n您要强制终止这些进程吗？这可能会导致数据丢失或系统不稳定！",
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QMessageBox.Yes | QMessageBox.No,
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QMessageBox.No
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)
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if reply == QMessageBox.No:
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logger.info(f"用户取消了终止占用设备 {device_path} 的进程。")
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QMessageBox.information(None, "信息", f"已取消终止占用设备 {device_path} 的进程。")
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return False
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if self._kill_pids(pids_to_kill_list):
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QMessageBox.information(None, "成功", f"已尝试终止占用设备 {device_path} 的所有进程。")
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# 进程终止后，设备可能仍然被挂载，因此再次尝试卸载。
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if main_mount_point and main_mount_point != 'N/A' and main_mount_point != '[SWAP]':
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logger.info(f"进程终止后，尝试再次卸载主挂载点 {main_mount_point}。")
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if self._unmount_target(main_mount_point):
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QMessageBox.information(None, "信息", f"设备 {device_path} 已成功卸载。")
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return True
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else: # 如果没有主挂载点，检查设备本身
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logger.info(f"进程终止后，尝试再次卸载设备 {device_path}。")
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if self._unmount_target(device_path):
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QMessageBox.information(None, "信息", f"设备 {device_path} 已成功卸载。")
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return True
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# 如果进程终止后仍未能卸载
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QMessageBox.warning(None, "警告", f"进程已终止，但未能成功卸载设备 {device_path}。可能仍有其他问题。")
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return False # 表示部分成功或需要进一步手动干预
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else:
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QMessageBox.critical(None, "错误", f"未能终止所有占用设备 {device_path} 的进程。")
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return False
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logger.warning(f"设备 {device_path} 占用解决逻辑未能完全处理。")
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return False
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Reference in New Issue
Block a user