Home | History | Annotate | Download | only in update_engine 
      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 
     21 #include <base/logging.h>
     22 #include <brillo/osrelease_reader.h>
     23 #include <cutils/properties.h>
     24 
     25 #include "update_engine/common/boot_control_interface.h"
     26 #include "update_engine/common/constants.h"
     27 #include "update_engine/common/platform_constants.h"
     28 #include "update_engine/common/prefs_interface.h"
     29 #include "update_engine/system_state.h"
     30 
     31 namespace chromeos_update_engine {
     32 
     33 namespace {
     34 
     35 // Build time properties name used in Brillo.
     36 const char kProductId[] = "product_id";
     37 const char kProductVersion[] = "product_version";
     38 const char kSystemVersion[] = "system_version";
     39 
     40 // Prefs used to store the target channel and powerwash settings.
     41 const char kPrefsImgPropChannelName[] = "img-prop-channel-name";
     42 const char kPrefsImgPropPowerwashAllowed[] = "img-prop-powerwash-allowed";
     43 
     44 // System properties that identifies the "board".
     45 const char kPropProductName[] = "ro.product.name";
     46 const char kPropBuildFingerprint[] = "ro.build.fingerprint";
     47 
     48 std::string GetStringWithDefault(const brillo::OsReleaseReader& osrelease,
     49                                  const std::string& key,
     50                                  const std::string& default_value) {
     51   std::string result;
     52   if (osrelease.GetString(key, &result))
     53     return result;
     54   LOG(INFO) << "Cannot load ImageProperty " << key << ", using default value "
     55             << default_value;
     56   return default_value;
     57 }
     58 
     59 }  // namespace
     60 
     61 namespace test {
     62 void SetImagePropertiesRootPrefix(const char* /* test_root_prefix */) {}
     63 }  // namespace test
     64 
     65 ImageProperties LoadImageProperties(SystemState* system_state) {
     66   ImageProperties result;
     67 
     68   brillo::OsReleaseReader osrelease;
     69   osrelease.Load();
     70   result.product_id = GetStringWithDefault(
     71       osrelease, kProductId, "developer-boards:brillo-starter-board");
     72   result.canary_product_id = result.product_id;
     73   std::string system_version =
     74       GetStringWithDefault(osrelease, kSystemVersion, "0.0.0");
     75   std::string product_version =
     76       GetStringWithDefault(osrelease, kProductVersion, "0");
     77   result.version = system_version + "." + product_version;
     78 
     79   char prop[PROPERTY_VALUE_MAX];
     80   property_get(kPropProductName, prop, "brillo");
     81   result.board = prop;
     82 
     83   property_get(kPropBuildFingerprint, prop, "none");
     84   result.build_fingerprint = prop;
     85 
     86   // Brillo images don't have a channel assigned. We stored the name of the
     87   // channel where we got the image from in prefs at the time of the update, so
     88   // we use that as the current channel if available. During provisioning, there
     89   // is no value assigned, so we default to the "stable-channel".
     90   std::string current_channel_key =
     91       kPrefsChannelOnSlotPrefix +
     92       std::to_string(system_state->boot_control()->GetCurrentSlot());
     93   std::string current_channel;
     94   if (!system_state->prefs()->Exists(current_channel_key) ||
     95       !system_state->prefs()->GetString(current_channel_key, &current_channel))
     96     current_channel = "stable-channel";
     97   result.current_channel = current_channel;
     98 
     99   // Brillo only supports the official omaha URL.
    100   result.omaha_url = constants::kOmahaDefaultProductionURL;
    101 
    102   return result;
    103 }
    104 
    105 MutableImageProperties LoadMutableImageProperties(SystemState* system_state) {
    106   MutableImageProperties result;
    107   PrefsInterface* const prefs = system_state->prefs();
    108   if (!prefs->GetString(kPrefsImgPropChannelName, &result.target_channel))
    109     result.target_channel.clear();
    110   if (!prefs->GetBoolean(kPrefsImgPropPowerwashAllowed,
    111                          &result.is_powerwash_allowed)) {
    112     result.is_powerwash_allowed = false;
    113   }
    114   return result;
    115 }
    116 
    117 bool StoreMutableImageProperties(SystemState* system_state,
    118                                  const MutableImageProperties& properties) {
    119   PrefsInterface* const prefs = system_state->prefs();
    120   return (
    121       prefs->SetString(kPrefsImgPropChannelName, properties.target_channel) &&
    122       prefs->SetBoolean(kPrefsImgPropPowerwashAllowed,
    123                         properties.is_powerwash_allowed));
    124 }
    125 
    126 }  // namespace chromeos_update_engine
    127