1 //
2 // Copyright (C) 2017 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/update_manager/enough_slots_ab_updates_policy_impl.h"
18 
19 namespace chromeos_update_manager {
20 
21 // Do not perform any updates if booted from removable device. This decision
22 // is final.
23 EvalStatus EnoughSlotsAbUpdatesPolicyImpl::UpdateCheckAllowed(
24     EvaluationContext* ec,
25     State* state,
26     std::string* error,
27     UpdateCheckParams* result) const {
28   const auto* num_slots_p =
29       ec->GetValue(state->system_provider()->var_num_slots());
30   if (num_slots_p == nullptr || *num_slots_p < 2) {
31     LOG(INFO) << "Not enough slots for A/B updates, disabling update checks.";
32     result->updates_enabled = false;
33     return EvalStatus::kSucceeded;
34   }
35   return EvalStatus::kContinue;
36 }
37 
38 }  // namespace chromeos_update_manager
39