| // Copyright 2018 The Chromium OS Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef CROS_DISKS_DRIVEFS_HELPER_H_ |
| #define CROS_DISKS_DRIVEFS_HELPER_H_ |
| |
| #include <memory> |
| #include <string> |
| #include <vector> |
| |
| #include <base/macros.h> |
| |
| #include "cros-disks/fuse_helper.h" |
| |
| namespace cros_disks { |
| |
| class Platform; |
| |
| // A helper for mounting DriveFS. |
| // |
| // DriveFS URIs are of the form: |
| // drivefs://identity |
| // |
| // The datadir option is required. It is the path DriveFS should use for its |
| // data. It must be an absolute path without parent directory references. This |
| // is enforced by |GetValidatedDataDir()| as part of |CreateMounter()|. Further, |
| // |SetupDirectoryForFUSEAccess()| enforces that datadir either does not exist, |
| // or already has the right owner (fuse-drivefs:chronos-access). |
| // |
| // |identity| is an opaque string. In particular it's a string representation of |
| // a base::UnguessableToken, used to lookup a pending DriveFS mount in Chrome. |
| class DrivefsHelper : public FUSEHelper { |
| public: |
| DrivefsHelper(const Platform* platform, |
| brillo::ProcessReaper* process_reaper); |
| ~DrivefsHelper() override; |
| |
| // FUSEHelper overrides: |
| std::unique_ptr<FUSEMounter> CreateMounter( |
| const base::FilePath& working_dir, |
| const Uri& source, |
| const base::FilePath& target_path, |
| const std::vector<std::string>& options) const override; |
| |
| protected: |
| // Make sure the dir is set up to be used by FUSE's helper user. |
| // Some FUSE modules may need secure and/or persistent storage of cached |
| // data somewhere in cryptohome. This method provides implementations |
| // with a shortcut for doing this. |
| // This is approximately `chown fuse-drivefs:chronos-access |dirpath|'. |
| virtual bool SetupDirectoryForFUSEAccess(const base::FilePath& dirpath) const; |
| |
| // Ensure |path| is accessible by chronos. |
| virtual bool CheckMyFilesPermissions(const base::FilePath& path) const; |
| |
| private: |
| friend class DrivefsHelperTest; |
| |
| // Returns the directory specified by |prefix| from the options if one is |
| // present and valid. Returns an empty path on failure. |
| base::FilePath GetValidatedDirectory(const std::vector<std::string>& options, |
| base::StringPiece prefix) const; |
| |
| DISALLOW_COPY_AND_ASSIGN(DrivefsHelper); |
| }; |
| |
| } // namespace cros_disks |
| |
| #endif // CROS_DISKS_DRIVEFS_HELPER_H_ |