1 files changed, 98 insertions, 0 deletions
diff --git a/aosp/apex_handler_android.cc b/aosp/apex_handler_android.cc
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+//
+// Copyright (C) 2021 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#include <utility>
+
+#include <base/files/file_util.h>
+
+#include "update_engine/aosp/apex_handler_android.h"
+#include "update_engine/common/utils.h"
+
+namespace chromeos_update_engine {
+
+// Don't change this path... apexd relies on it.
+constexpr const char* kApexReserveSpaceDir = "/data/apex/ota_reserved";
+
+uint64_t ApexHandlerAndroid::CalculateSize(
+    const std::vector<ApexInfo>& apex_infos) const {
+  return CalculateSize(apex_infos, GetApexService());
+}
+
+uint64_t ApexHandlerAndroid::CalculateSize(
+    const std::vector<ApexInfo>& apex_infos,
+    android::sp<android::apex::IApexService> apex_service) const {
+  // The safest option is to allocate space for every compressed APEX
+  uint64_t size_required_default = 0;
+
+  // We might not need to decompress every APEX. Communicate with apexd to get
+  // accurate requirement.
+  int64_t size_from_apexd;
+  android::apex::CompressedApexInfoList compressed_apex_info_list;
+
+  for (const auto& apex_info : apex_infos) {
+    if (!apex_info.is_compressed()) {
+      continue;
+    }
+
+    size_required_default += apex_info.decompressed_size();
+
+    android::apex::CompressedApexInfo compressed_apex_info;
+    compressed_apex_info.moduleName = apex_info.package_name();
+    compressed_apex_info.versionCode = apex_info.version();
+    compressed_apex_info.decompressedSize = apex_info.decompressed_size();
+    compressed_apex_info_list.apexInfos.emplace_back(
+        std::move(compressed_apex_info));
+  }
+  if (size_required_default == 0 || apex_service == nullptr) {
+    return size_required_default;
+  }
+
+  auto result = apex_service->calculateSizeForCompressedApex(
+      compressed_apex_info_list, &size_from_apexd);
+  if (!result.isOk()) {
+    return size_required_default;
+  }
+  return size_from_apexd;
+}
+
+bool ApexHandlerAndroid::AllocateSpace(const uint64_t size_required) const {
+  return AllocateSpace(size_required, kApexReserveSpaceDir);
+}
+
+bool ApexHandlerAndroid::AllocateSpace(const uint64_t size_required,
+                                       const std::string& dir_path) const {
+  if (size_required == 0) {
+    return true;
+  }
+  base::FilePath path{dir_path};
+  // The filename is not important, it just needs to be under
+  // kApexReserveSpaceDir. We call it "full.tmp" because the current space
+  // estimation is simply adding up all decompressed sizes.
+  path = path.Append("full.tmp");
+  return utils::ReserveStorageSpace(path.value().c_str(), size_required);
+}
+
+android::sp<android::apex::IApexService> ApexHandlerAndroid::GetApexService()
+    const {
+  auto binder = android::defaultServiceManager()->waitForService(
+      android::String16("apexservice"));
+  if (binder == nullptr) {
+    return nullptr;
+  }
+  return android::interface_cast<android::apex::IApexService>(binder);
+}
+
+}  // namespace chromeos_update_engine