1// 2// Copyright (C) 2015 The Android Open Source Project 3// 4// Licensed under the Apache License, Version 2.0 (the "License"); 5// you may not use this file except in compliance with the License. 6// You may obtain a copy of the License at 7// 8// http://www.apache.org/licenses/LICENSE-2.0 9// 10// Unless required by applicable law or agreed to in writing, software 11// distributed under the License is distributed on an "AS IS" BASIS, 12// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13// See the License for the specific language governing permissions and 14// limitations under the License. 15// 16 17#include "update_engine/boot_control_android.h" 18 19#include <base/bind.h> 20#include <base/files/file_util.h> 21#include <base/logging.h> 22#include <base/strings/string_util.h> 23#include <brillo/make_unique_ptr.h> 24#include <brillo/message_loops/message_loop.h> 25 26#include "update_engine/common/utils.h" 27#include "update_engine/utils_android.h" 28 29using std::string; 30 31using android::hardware::Return; 32using android::hardware::boot::V1_0::BoolResult; 33using android::hardware::boot::V1_0::CommandResult; 34using android::hardware::boot::V1_0::IBootControl; 35using android::hardware::hidl_string; 36 37namespace { 38auto StoreResultCallback(CommandResult* dest) { 39 return [dest](const CommandResult& result) { *dest = result; }; 40} 41} // namespace 42 43namespace chromeos_update_engine { 44 45namespace boot_control { 46 47// Factory defined in boot_control.h. 48std::unique_ptr<BootControlInterface> CreateBootControl() { 49 std::unique_ptr<BootControlAndroid> boot_control(new BootControlAndroid()); 50 if (!boot_control->Init()) { 51 return nullptr; 52 } 53 return std::move(boot_control); 54} 55 56} // namespace boot_control 57 58bool BootControlAndroid::Init() { 59 module_ = IBootControl::getService(); 60 if (module_ == nullptr) { 61 LOG(ERROR) << "Error getting bootctrl HIDL module."; 62 return false; 63 } 64 65 LOG(INFO) << "Loaded boot control hidl hal."; 66 67 return true; 68} 69 70unsigned int BootControlAndroid::GetNumSlots() const { 71 return module_->getNumberSlots(); 72} 73 74BootControlInterface::Slot BootControlAndroid::GetCurrentSlot() const { 75 return module_->getCurrentSlot(); 76} 77 78bool BootControlAndroid::GetPartitionDevice(const string& partition_name, 79 Slot slot, 80 string* device) const { 81 // We can't use fs_mgr to look up |partition_name| because fstab 82 // doesn't list every slot partition (it uses the slotselect option 83 // to mask the suffix). 84 // 85 // We can however assume that there's an entry for the /misc mount 86 // point and use that to get the device file for the misc 87 // partition. This helps us locate the disk that |partition_name| 88 // resides on. From there we'll assume that a by-name scheme is used 89 // so we can just replace the trailing "misc" by the given 90 // |partition_name| and suffix corresponding to |slot|, e.g. 91 // 92 // /dev/block/platform/soc.0/7824900.sdhci/by-name/misc -> 93 // /dev/block/platform/soc.0/7824900.sdhci/by-name/boot_a 94 // 95 // If needed, it's possible to relax the by-name assumption in the 96 // future by trawling /sys/block looking for the appropriate sibling 97 // of misc and then finding an entry in /dev matching the sysfs 98 // entry. 99 100 base::FilePath misc_device; 101 if (!utils::DeviceForMountPoint("/misc", &misc_device)) 102 return false; 103 104 if (!utils::IsSymlink(misc_device.value().c_str())) { 105 LOG(ERROR) << "Device file " << misc_device.value() << " for /misc " 106 << "is not a symlink."; 107 return false; 108 } 109 110 string suffix; 111 auto store_suffix_cb = [&suffix](hidl_string cb_suffix) { 112 suffix = cb_suffix.c_str(); 113 }; 114 Return<void> ret = module_->getSuffix(slot, store_suffix_cb); 115 116 if (!ret.isOk()) { 117 LOG(ERROR) << "boot_control impl returned no suffix for slot " 118 << SlotName(slot); 119 return false; 120 } 121 122 base::FilePath path = misc_device.DirName().Append(partition_name + suffix); 123 if (!base::PathExists(path)) { 124 LOG(ERROR) << "Device file " << path.value() << " does not exist."; 125 return false; 126 } 127 128 *device = path.value(); 129 return true; 130} 131 132bool BootControlAndroid::IsSlotBootable(Slot slot) const { 133 Return<BoolResult> ret = module_->isSlotBootable(slot); 134 if (!ret.isOk()) { 135 LOG(ERROR) << "Unable to determine if slot " << SlotName(slot) 136 << " is bootable: " 137 << ret.description(); 138 return false; 139 } 140 if (ret == BoolResult::INVALID_SLOT) { 141 LOG(ERROR) << "Invalid slot: " << SlotName(slot); 142 return false; 143 } 144 return ret == BoolResult::TRUE; 145} 146 147bool BootControlAndroid::MarkSlotUnbootable(Slot slot) { 148 CommandResult result; 149 auto ret = module_->setSlotAsUnbootable(slot, StoreResultCallback(&result)); 150 if (!ret.isOk()) { 151 LOG(ERROR) << "Unable to call MarkSlotUnbootable for slot " 152 << SlotName(slot) << ": " 153 << ret.description(); 154 return false; 155 } 156 if (!result.success) { 157 LOG(ERROR) << "Unable to mark slot " << SlotName(slot) 158 << " as unbootable: " << result.errMsg.c_str(); 159 } 160 return result.success; 161} 162 163bool BootControlAndroid::SetActiveBootSlot(Slot slot) { 164 CommandResult result; 165 auto ret = module_->setActiveBootSlot(slot, StoreResultCallback(&result)); 166 if (!ret.isOk()) { 167 LOG(ERROR) << "Unable to call SetActiveBootSlot for slot " << SlotName(slot) 168 << ": " << ret.description(); 169 return false; 170 } 171 if (!result.success) { 172 LOG(ERROR) << "Unable to set the active slot to slot " << SlotName(slot) 173 << ": " << result.errMsg.c_str(); 174 } 175 return result.success; 176} 177 178bool BootControlAndroid::MarkBootSuccessfulAsync( 179 base::Callback<void(bool)> callback) { 180 CommandResult result; 181 auto ret = module_->markBootSuccessful(StoreResultCallback(&result)); 182 if (!ret.isOk()) { 183 LOG(ERROR) << "Unable to call MarkBootSuccessful: " 184 << ret.description(); 185 return false; 186 } 187 if (!result.success) { 188 LOG(ERROR) << "Unable to mark boot successful: " << result.errMsg.c_str(); 189 } 190 return brillo::MessageLoop::current()->PostTask( 191 FROM_HERE, base::Bind(callback, result.success)) != 192 brillo::MessageLoop::kTaskIdNull; 193} 194 195} // namespace chromeos_update_engine 196