134 lines
4.6 KiB
C++
134 lines
4.6 KiB
C++
/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <optional>
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#include <string>
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#include <android-base/file.h>
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#include <android-base/logging.h>
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#include <android-base/unique_fd.h>
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#include <android/hardware/boot/1.0/IBootControl.h>
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#include <fstab/fstab.h>
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#include <liblp/liblp.h>
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// Logical partitions are only mapped to a block device as needed, and
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// immediately unmapped when no longer needed. In order to enforce this we
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// require accessing partitions through a Handle abstraction, which may perform
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// additional operations after closing its file descriptor.
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class PartitionHandle {
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public:
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PartitionHandle() {}
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explicit PartitionHandle(const std::string& path) : path_(path) {}
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PartitionHandle(const std::string& path, std::function<void()>&& closer)
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: path_(path), closer_(std::move(closer)) {}
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PartitionHandle(PartitionHandle&& other) = default;
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PartitionHandle& operator=(PartitionHandle&& other) = default;
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~PartitionHandle() {
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if (closer_) {
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// Make sure the device is closed first.
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fd_ = {};
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closer_();
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}
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}
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const std::string& path() const { return path_; }
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int fd() const { return fd_.get(); }
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bool Open(int flags) {
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flags |= (O_EXCL | O_CLOEXEC | O_BINARY);
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// Attempts to open a second device can fail with EBUSY if the device is already open.
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// Explicitly close any previously opened devices as unique_fd won't close them until
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// after the attempt to open.
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fd_.reset();
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fd_ = android::base::unique_fd(TEMP_FAILURE_RETRY(open(path_.c_str(), flags)));
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if (fd_ < 0) {
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PLOG(ERROR) << "Failed to open block device: " << path_;
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return false;
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}
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flags_ = flags;
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return true;
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}
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bool Reset(int flags) {
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if (fd_.ok() && (flags | O_EXCL | O_CLOEXEC | O_BINARY) == flags_) {
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return true;
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}
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off_t offset = fd_.ok() ? lseek(fd_.get(), 0, SEEK_CUR) : 0;
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if (offset < 0) {
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PLOG(ERROR) << "Failed lseek on block device: " << path_;
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return false;
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}
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sync();
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if (Open(flags) == false) {
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return false;
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}
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if (lseek(fd_.get(), offset, SEEK_SET) != offset) {
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PLOG(ERROR) << "Failed lseek on block device: " << path_;
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return false;
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}
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return true;
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}
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private:
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std::string path_;
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android::base::unique_fd fd_;
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int flags_;
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std::function<void()> closer_;
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};
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class AutoMountMetadata {
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public:
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AutoMountMetadata();
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~AutoMountMetadata();
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explicit operator bool() const { return mounted_; }
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private:
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android::fs_mgr::Fstab fstab_;
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bool mounted_ = false;
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bool should_unmount_ = false;
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};
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class FastbootDevice;
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// On normal devices, the super partition is always named "super". On retrofit
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// devices, the name must be derived from the partition name or current slot.
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// This helper assists in choosing the correct super for a given partition
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// name.
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std::string GetSuperSlotSuffix(FastbootDevice* device, const std::string& partition_name);
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std::optional<std::string> FindPhysicalPartition(const std::string& name);
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bool LogicalPartitionExists(FastbootDevice* device, const std::string& name,
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bool* is_zero_length = nullptr);
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// Partition is O_WRONLY by default, caller should pass O_RDONLY for reading.
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// Caller may pass additional flags if needed. (O_EXCL | O_CLOEXEC | O_BINARY)
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// will be logically ORed internally.
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bool OpenPartition(FastbootDevice* device, const std::string& name, PartitionHandle* handle,
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int flags = O_WRONLY);
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bool GetSlotNumber(const std::string& slot, android::hardware::boot::V1_0::Slot* number);
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std::vector<std::string> ListPartitions(FastbootDevice* device);
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bool GetDeviceLockStatus();
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// Update all copies of metadata.
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bool UpdateAllPartitionMetadata(FastbootDevice* device, const std::string& super_name,
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const android::fs_mgr::LpMetadata& metadata);
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