Alex Deymo | 8561665 | 2015-10-15 18:48:31 -0700 | [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/image_properties.h" |
| 18 | |
| 19 | #include <string> |
| 20 | #include <vector> |
| 21 | |
| 22 | #include <base/files/file_util.h> |
| 23 | #include <base/logging.h> |
| 24 | #include <brillo/key_value_store.h> |
| 25 | |
| 26 | #include "update_engine/constants.h" |
| 27 | #include "update_engine/hardware_interface.h" |
| 28 | #include "update_engine/platform_constants.h" |
| 29 | #include "update_engine/system_state.h" |
| 30 | |
| 31 | namespace { |
| 32 | |
| 33 | const char kLsbRelease[] = "/etc/lsb-release"; |
| 34 | |
| 35 | const char kLsbReleaseAppIdKey[] = "CHROMEOS_RELEASE_APPID"; |
| 36 | const char kLsbReleaseAutoUpdateServerKey[] = "CHROMEOS_AUSERVER"; |
| 37 | const char kLsbReleaseBoardAppIdKey[] = "CHROMEOS_BOARD_APPID"; |
| 38 | const char kLsbReleaseBoardKey[] = "CHROMEOS_RELEASE_BOARD"; |
| 39 | const char kLsbReleaseCanaryAppIdKey[] = "CHROMEOS_CANARY_APPID"; |
| 40 | const char kLsbReleaseIsPowerwashAllowedKey[] = "CHROMEOS_IS_POWERWASH_ALLOWED"; |
| 41 | const char kLsbReleaseUpdateChannelKey[] = "CHROMEOS_RELEASE_TRACK"; |
| 42 | const char kLsbReleaseVersionKey[] = "CHROMEOS_RELEASE_VERSION"; |
| 43 | |
| 44 | const char kDefaultAppId[] = "{87efface-864d-49a5-9bb3-4b050a7c227a}"; |
| 45 | |
| 46 | // A prefix added to the path, used for testing. |
Alex Deymo | 3be05c8 | 2015-10-23 11:29:11 -0700 | [diff] [blame] | 47 | const char* root_prefix = nullptr; |
Alex Deymo | 8561665 | 2015-10-15 18:48:31 -0700 | [diff] [blame] | 48 | |
| 49 | std::string GetStringWithDefault(const brillo::KeyValueStore& store, |
| 50 | const std::string& key, |
| 51 | const std::string& default_value) { |
| 52 | std::string result; |
| 53 | if (store.GetString(key, &result)) |
| 54 | return result; |
| 55 | LOG(INFO) << "Cannot load ImageProperty " << key << ", using default value " |
| 56 | << default_value; |
| 57 | return default_value; |
| 58 | } |
| 59 | |
| 60 | enum class LsbReleaseSource { |
| 61 | kSystem, |
| 62 | kStateful, |
| 63 | }; |
| 64 | |
| 65 | // Loads the lsb-release properties into the key-value |store| reading the file |
| 66 | // from either the system image or the stateful partition as specified by |
| 67 | // |source|. The loaded values are added to the store, possibly overriding |
| 68 | // existing values. |
| 69 | void LoadLsbRelease(LsbReleaseSource source, brillo::KeyValueStore* store) { |
Alex Deymo | 3be05c8 | 2015-10-23 11:29:11 -0700 | [diff] [blame] | 70 | std::string path; |
| 71 | if (root_prefix) |
| 72 | path = root_prefix; |
Alex Deymo | 8561665 | 2015-10-15 18:48:31 -0700 | [diff] [blame] | 73 | if (source == LsbReleaseSource::kStateful) |
| 74 | path += chromeos_update_engine::kStatefulPartition; |
| 75 | store->Load(base::FilePath(path + kLsbRelease)); |
| 76 | } |
| 77 | |
| 78 | } // namespace |
| 79 | |
| 80 | namespace chromeos_update_engine { |
| 81 | |
| 82 | namespace test { |
| 83 | void SetImagePropertiesRootPrefix(const char* test_root_prefix) { |
| 84 | root_prefix = test_root_prefix; |
| 85 | } |
| 86 | } // namespace test |
| 87 | |
| 88 | ImageProperties LoadImageProperties(SystemState* system_state) { |
| 89 | ImageProperties result; |
| 90 | |
| 91 | brillo::KeyValueStore lsb_release; |
| 92 | LoadLsbRelease(LsbReleaseSource::kSystem, &lsb_release); |
| 93 | result.current_channel = GetStringWithDefault( |
| 94 | lsb_release, kLsbReleaseUpdateChannelKey, "stable-channel"); |
| 95 | |
| 96 | // In dev-mode and unofficial build we can override the image properties set |
| 97 | // in the system image with the ones from the stateful partition, except the |
| 98 | // channel of the current image. |
| 99 | HardwareInterface* const hardware = system_state->hardware(); |
| 100 | if (!hardware->IsOfficialBuild() || !hardware->IsNormalBootMode()) |
| 101 | LoadLsbRelease(LsbReleaseSource::kStateful, &lsb_release); |
| 102 | |
| 103 | // The release_app_id is used as the default appid, but can be override by |
| 104 | // the board appid in the general case or the canary appid for the canary |
| 105 | // channel only. |
| 106 | std::string release_app_id = |
| 107 | GetStringWithDefault(lsb_release, kLsbReleaseAppIdKey, kDefaultAppId); |
| 108 | |
| 109 | result.product_id = GetStringWithDefault( |
| 110 | lsb_release, kLsbReleaseBoardAppIdKey, release_app_id); |
| 111 | result.canary_product_id = GetStringWithDefault( |
| 112 | lsb_release, kLsbReleaseCanaryAppIdKey, release_app_id); |
| 113 | result.board = GetStringWithDefault(lsb_release, kLsbReleaseBoardKey, ""); |
| 114 | result.version = GetStringWithDefault(lsb_release, kLsbReleaseVersionKey, ""); |
| 115 | result.omaha_url = |
| 116 | GetStringWithDefault(lsb_release, kLsbReleaseAutoUpdateServerKey, |
| 117 | constants::kOmahaDefaultProductionURL); |
| 118 | |
| 119 | return result; |
| 120 | } |
| 121 | |
| 122 | MutableImageProperties LoadMutableImageProperties(SystemState* system_state) { |
| 123 | MutableImageProperties result; |
| 124 | brillo::KeyValueStore lsb_release; |
| 125 | LoadLsbRelease(LsbReleaseSource::kSystem, &lsb_release); |
| 126 | LoadLsbRelease(LsbReleaseSource::kStateful, &lsb_release); |
| 127 | result.target_channel = GetStringWithDefault( |
| 128 | lsb_release, kLsbReleaseUpdateChannelKey, "stable-channel"); |
| 129 | if (!lsb_release.GetBoolean(kLsbReleaseIsPowerwashAllowedKey, |
| 130 | &result.is_powerwash_allowed)) |
| 131 | result.is_powerwash_allowed = false; |
| 132 | return result; |
| 133 | } |
| 134 | |
| 135 | bool StoreMutableImageProperties(SystemState* system_state, |
| 136 | const MutableImageProperties& properties) { |
| 137 | brillo::KeyValueStore lsb_release; |
| 138 | LoadLsbRelease(LsbReleaseSource::kStateful, &lsb_release); |
| 139 | lsb_release.SetString(kLsbReleaseUpdateChannelKey, properties.target_channel); |
| 140 | lsb_release.SetBoolean(kLsbReleaseIsPowerwashAllowedKey, |
| 141 | properties.is_powerwash_allowed); |
| 142 | |
Alex Deymo | 5378f5e | 2015-11-10 15:02:50 -0800 | [diff] [blame^] | 143 | std::string root_prefix_str = root_prefix ? root_prefix : ""; |
| 144 | base::FilePath path(root_prefix_str + kStatefulPartition + kLsbRelease); |
Alex Deymo | 8561665 | 2015-10-15 18:48:31 -0700 | [diff] [blame] | 145 | if (!base::DirectoryExists(path.DirName())) |
| 146 | base::CreateDirectory(path.DirName()); |
| 147 | return lsb_release.Save(path); |
| 148 | } |
| 149 | |
| 150 | } // namespace chromeos_update_engine |