Function setCustomDataDir

apps/desktop/main/paths.ts:173–232

(
  dataDir: string | null,
  migrate: boolean = true
)

 * @param migrate 是否迁移现有数据（合并复制，不会覆盖目标文件）
 */
export function setCustomDataDir(
  dataDir: string | null,
  migrate: boolean = true
): { success: boolean; error?: string; from?: string; to?: string; requiresRelaunch?: boolean } {
  const normalized = typeof dataDir === 'string' ? dataDir.trim() : ''
  const oldDir = getUserDataDir()

  try {
    if (process.env.CHATLAB_DATA_DIR) {
      return { success: false, error: 'CHATLAB_DATA_DIR 已设置，不能在界面中切换数据目录' }
    }

    const newDir = normalized || getDefaultUserDataDir()

    if (!path.isAbsolute(newDir)) {
      return { success: false, error: '数据目录必须是绝对路径' }
    }

    if (migrate && oldDir !== newDir && isSubPath(oldDir, newDir)) {
      return { success: false, error: '目标目录不能是当前数据目录的子目录' }
    }

    if (!isPathSafe(newDir)) {
      return { success: false, error: '不能使用系统关键目录作为数据目录' }
    }

    try {
      const exePath = app.getPath('exe')
      if (isInsideAppInstallDir(newDir, exePath)) {
        return { success: false, error: '不能将数据目录放在应用安装目录下，应用更新时该目录会被清空' }
      }
    } catch {
      // 获取 exe 路径失败时跳过此检查
    }

    if (!isUserDataDirSafeToUse(newDir)) {
      return { success: false, error: '目标目录不为空且不包含 ChatLab 数据，请选择空目录或已有数据目录' }
    }

    if (path.resolve(oldDir) === path.resolve(newDir)) {
      const config = readStorageConfig()
      writeStorageConfig({ ...config, pendingDataDirMigration: undefined })
      return { success: true, from: oldDir, to: newDir, requiresRelaunch: false }
    }

    const config = readStorageConfig()
    const pending = createPendingDataDirMigration({
      from: oldDir,
      to: newDir,
      migrate,
      targetWasEmpty: isDirectoryEmptyOrMissing(newDir),
    })
    writeStorageConfig({ ...config, pendingDataDirMigration: pending })

    return { success: true, from: oldDir, to: newDir, requiresRelaunch: true }
  } catch (error) {
    console.error('[Paths] Error setting custom data dir:', error)
    return { success: false, error: error instanceof Error ? error.message : String(error) }