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Diffstat (limited to 'edify/include/edify/updater_runtime_interface.h')
-rw-r--r-- | edify/include/edify/updater_runtime_interface.h | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/edify/include/edify/updater_runtime_interface.h b/edify/include/edify/updater_runtime_interface.h new file mode 100644 index 000000000..15ccd832d --- /dev/null +++ b/edify/include/edify/updater_runtime_interface.h @@ -0,0 +1,69 @@ +/* + * Copyright (C) 2019 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#pragma once + +#include <string> +#include <string_view> +#include <vector> + +// This class serves as the base to updater runtime. It wraps the runtime dependent functions; and +// updates on device and host simulations can have different implementations. e.g. block devices +// during host simulation merely a temporary file. With this class, the caller side in registered +// updater's functions will stay the same for both update and simulation. +class UpdaterRuntimeInterface { + public: + virtual ~UpdaterRuntimeInterface() = default; + + // Returns true if it's a runtime instance for simulation. + virtual bool IsSimulator() const = 0; + + // Returns the value of system property |key|. If the property doesn't exist, returns + // |default_value|. + virtual std::string GetProperty(const std::string_view key, + const std::string_view default_value) const = 0; + + // Given the name of the block device, returns |name| for updates on the device; or the file path + // to the fake block device for simulations. + virtual std::string FindBlockDeviceName(const std::string_view name) const = 0; + + // Mounts the |location| on |mount_point|. Returns 0 on success. + virtual int Mount(const std::string_view location, const std::string_view mount_point, + const std::string_view fs_type, const std::string_view mount_options) = 0; + + // Returns true if |mount_point| is mounted. + virtual bool IsMounted(const std::string_view mount_point) const = 0; + + // Unmounts the |mount_point|. Returns a pair of results with the first value indicating + // if the |mount_point| is mounted, and the second value indicating the result of umount(2). + virtual std::pair<bool, int> Unmount(const std::string_view mount_point) = 0; + + // Reads |filename| and puts its value to |content|. + virtual bool ReadFileToString(const std::string_view filename, std::string* content) const = 0; + + // Updates the content of |filename| with |content|. + virtual bool WriteStringToFile(const std::string_view content, + const std::string_view filename) const = 0; + + // Wipes the first |len| bytes of block device in |filename|. + virtual int WipeBlockDevice(const std::string_view filename, size_t len) const = 0; + + // Starts a child process and runs the program with |args|. Uses vfork(2) if |is_vfork| is true. + virtual int RunProgram(const std::vector<std::string>& args, bool is_vfork) const = 0; + + // Runs tune2fs with arguments |args|. + virtual int Tune2Fs(const std::vector<std::string>& args) const = 0; +};
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