Connor O'Brien | cee6ad9 | 2016-11-21 13:53:52 -0800 | [diff] [blame] | 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_recovery.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> |
Connor O'Brien | cee6ad9 | 2016-11-21 13:53:52 -0800 | [diff] [blame] | 23 | #include <brillo/message_loops/message_loop.h> |
| 24 | |
| 25 | #include "update_engine/common/utils.h" |
| 26 | #include "update_engine/utils_android.h" |
| 27 | |
| 28 | using std::string; |
| 29 | |
| 30 | #ifndef _UE_SIDELOAD |
| 31 | #error "BootControlRecovery should only be used for update_engine_sideload." |
| 32 | #endif |
| 33 | |
| 34 | // When called from update_engine_sideload, we don't attempt to dynamically load |
| 35 | // the right boot_control HAL, instead we use the only HAL statically linked in |
| 36 | // via the PRODUCT_STATIC_BOOT_CONTROL_HAL make variable and access the module |
| 37 | // struct directly. |
| 38 | extern const hw_module_t HAL_MODULE_INFO_SYM; |
| 39 | |
| 40 | namespace chromeos_update_engine { |
| 41 | |
| 42 | namespace boot_control { |
| 43 | |
| 44 | // Factory defined in boot_control.h. |
| 45 | std::unique_ptr<BootControlInterface> CreateBootControl() { |
| 46 | std::unique_ptr<BootControlRecovery> boot_control(new BootControlRecovery()); |
| 47 | if (!boot_control->Init()) { |
| 48 | return nullptr; |
| 49 | } |
| 50 | return std::move(boot_control); |
| 51 | } |
| 52 | |
| 53 | } // namespace boot_control |
| 54 | |
| 55 | bool BootControlRecovery::Init() { |
| 56 | const hw_module_t* hw_module; |
| 57 | int ret; |
| 58 | |
| 59 | // For update_engine_sideload, we simulate the hw_get_module() by accessing it |
| 60 | // from the current process directly. |
| 61 | hw_module = &HAL_MODULE_INFO_SYM; |
| 62 | ret = 0; |
| 63 | if (!hw_module || |
| 64 | strcmp(BOOT_CONTROL_HARDWARE_MODULE_ID, hw_module->id) != 0) { |
| 65 | ret = -EINVAL; |
| 66 | } |
| 67 | if (ret != 0) { |
| 68 | LOG(ERROR) << "Error loading boot_control HAL implementation."; |
| 69 | return false; |
| 70 | } |
| 71 | |
| 72 | module_ = reinterpret_cast<boot_control_module_t*>( |
| 73 | const_cast<hw_module_t*>(hw_module)); |
| 74 | module_->init(module_); |
| 75 | |
| 76 | LOG(INFO) << "Loaded boot_control HAL " |
| 77 | << "'" << hw_module->name << "' " |
| 78 | << "version " << (hw_module->module_api_version >> 8) << "." |
| 79 | << (hw_module->module_api_version & 0xff) << " " |
| 80 | << "authored by '" << hw_module->author << "'."; |
| 81 | return true; |
| 82 | } |
| 83 | |
| 84 | unsigned int BootControlRecovery::GetNumSlots() const { |
| 85 | return module_->getNumberSlots(module_); |
| 86 | } |
| 87 | |
| 88 | BootControlInterface::Slot BootControlRecovery::GetCurrentSlot() const { |
| 89 | return module_->getCurrentSlot(module_); |
| 90 | } |
| 91 | |
| 92 | bool BootControlRecovery::GetPartitionDevice(const string& partition_name, |
| 93 | Slot slot, |
| 94 | string* device) const { |
| 95 | // We can't use fs_mgr to look up |partition_name| because fstab |
| 96 | // doesn't list every slot partition (it uses the slotselect option |
| 97 | // to mask the suffix). |
| 98 | // |
| 99 | // We can however assume that there's an entry for the /misc mount |
| 100 | // point and use that to get the device file for the misc |
| 101 | // partition. This helps us locate the disk that |partition_name| |
| 102 | // resides on. From there we'll assume that a by-name scheme is used |
| 103 | // so we can just replace the trailing "misc" by the given |
| 104 | // |partition_name| and suffix corresponding to |slot|, e.g. |
| 105 | // |
| 106 | // /dev/block/platform/soc.0/7824900.sdhci/by-name/misc -> |
| 107 | // /dev/block/platform/soc.0/7824900.sdhci/by-name/boot_a |
| 108 | // |
| 109 | // If needed, it's possible to relax the by-name assumption in the |
| 110 | // future by trawling /sys/block looking for the appropriate sibling |
| 111 | // of misc and then finding an entry in /dev matching the sysfs |
| 112 | // entry. |
| 113 | |
| 114 | base::FilePath misc_device; |
| 115 | if (!utils::DeviceForMountPoint("/misc", &misc_device)) |
| 116 | return false; |
| 117 | |
| 118 | if (!utils::IsSymlink(misc_device.value().c_str())) { |
| 119 | LOG(ERROR) << "Device file " << misc_device.value() << " for /misc " |
| 120 | << "is not a symlink."; |
| 121 | return false; |
| 122 | } |
| 123 | |
| 124 | const char* suffix = module_->getSuffix(module_, slot); |
| 125 | if (suffix == nullptr) { |
| 126 | LOG(ERROR) << "boot_control impl returned no suffix for slot " |
| 127 | << SlotName(slot); |
| 128 | return false; |
| 129 | } |
| 130 | |
| 131 | base::FilePath path = misc_device.DirName().Append(partition_name + suffix); |
| 132 | if (!base::PathExists(path)) { |
| 133 | LOG(ERROR) << "Device file " << path.value() << " does not exist."; |
| 134 | return false; |
| 135 | } |
| 136 | |
| 137 | *device = path.value(); |
| 138 | return true; |
| 139 | } |
| 140 | |
| 141 | bool BootControlRecovery::IsSlotBootable(Slot slot) const { |
| 142 | int ret = module_->isSlotBootable(module_, slot); |
| 143 | if (ret < 0) { |
| 144 | LOG(ERROR) << "Unable to determine if slot " << SlotName(slot) |
| 145 | << " is bootable: " << strerror(-ret); |
| 146 | return false; |
| 147 | } |
| 148 | return ret == 1; |
| 149 | } |
| 150 | |
| 151 | bool BootControlRecovery::MarkSlotUnbootable(Slot slot) { |
| 152 | int ret = module_->setSlotAsUnbootable(module_, slot); |
| 153 | if (ret < 0) { |
| 154 | LOG(ERROR) << "Unable to mark slot " << SlotName(slot) |
| 155 | << " as bootable: " << strerror(-ret); |
| 156 | return false; |
| 157 | } |
| 158 | return ret == 0; |
| 159 | } |
| 160 | |
| 161 | bool BootControlRecovery::SetActiveBootSlot(Slot slot) { |
| 162 | int ret = module_->setActiveBootSlot(module_, slot); |
| 163 | if (ret < 0) { |
| 164 | LOG(ERROR) << "Unable to set the active slot to slot " << SlotName(slot) |
| 165 | << ": " << strerror(-ret); |
| 166 | } |
| 167 | return ret == 0; |
| 168 | } |
| 169 | |
| 170 | bool BootControlRecovery::MarkBootSuccessfulAsync( |
| 171 | base::Callback<void(bool)> callback) { |
| 172 | int ret = module_->markBootSuccessful(module_); |
| 173 | if (ret < 0) { |
| 174 | LOG(ERROR) << "Unable to mark boot successful: " << strerror(-ret); |
| 175 | } |
| 176 | return brillo::MessageLoop::current()->PostTask( |
| 177 | FROM_HERE, base::Bind(callback, ret == 0)) != |
| 178 | brillo::MessageLoop::kTaskIdNull; |
| 179 | } |
| 180 | |
| 181 | } // namespace chromeos_update_engine |