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140 lines
5.3 KiB
140 lines
5.3 KiB
/*
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* Copyright (C) 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <functional>
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#include <string>
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#include <unordered_map>
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#include <vector>
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#include "apex_constants.h"
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#include "apex_file.h"
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#include <android-base/result.h>
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namespace android {
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namespace apex {
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using ApexFileRef = std::reference_wrapper<const android::apex::ApexFile>;
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// This class serves as a ApexFile repository for all apexes on device. It also
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// provides information about the ApexFiles it hosts, such as which are
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// pre-installed and which are data. Such information can be used, for example,
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// to verify validity of an apex before trying to mount it.
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//
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// It's expected to have a single instance of this class in a process that
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// mounts apexes (e.g. apexd, otapreopt_chroot).
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class ApexFileRepository final {
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public:
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// c-tor and d-tor are exposed for testing.
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explicit ApexFileRepository(
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const std::string& decompression_dir = kApexDecompressedDir)
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: decompression_dir_(decompression_dir){};
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~ApexFileRepository() {
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pre_installed_store_.clear();
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data_store_.clear();
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};
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// Returns a singletone instance of this class.
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static ApexFileRepository& GetInstance();
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// Populate instance by collecting pre-installed apex files from the given
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// |prebuilt_dirs|.
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// Note: this call is **not thread safe** and is expected to be performed in a
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// single thread during initialization of apexd. After initialization is
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// finished, all queries to the instance are thread safe.
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android::base::Result<void> AddPreInstalledApex(
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const std::vector<std::string>& prebuilt_dirs);
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// Populate instance by collecting data apex files from the given |data_dir|.
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// Note: this call is **not thread safe** and is expected to be performed in a
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// single thread during initialization of apexd. After initialization is
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// finished, all queries to the instance are thread safe.
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android::base::Result<void> AddDataApex(const std::string& data_dir);
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// Returns trusted public key for an apex with the given |name|.
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android::base::Result<const std::string> GetPublicKey(
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const std::string& name) const;
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// Returns path to the pre-installed version of an apex with the given |name|.
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android::base::Result<const std::string> GetPreinstalledPath(
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const std::string& name) const;
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// Returns path to the data version of an apex with the given |name|.
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android::base::Result<const std::string> GetDataPath(
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const std::string& name) const;
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// Checks whether there is a pre-installed version of an apex with the given
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// |name|.
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bool HasPreInstalledVersion(const std::string& name) const;
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// Checks whether there is a data version of an apex with the given |name|.
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bool HasDataVersion(const std::string& name) const;
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// Checks if given |apex| is pre-installed.
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bool IsPreInstalledApex(const ApexFile& apex) const;
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// Checks if given |apex| is decompressed from a pre-installed APEX
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bool IsDecompressedApex(const ApexFile& apex) const;
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// Returns reference to all pre-installed APEX on device
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std::vector<ApexFileRef> GetPreInstalledApexFiles() const;
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// Returns reference to all data APEX on device
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std::vector<ApexFileRef> GetDataApexFiles() const;
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// Group all ApexFiles on device by their package name
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std::unordered_map<std::string, std::vector<ApexFileRef>> AllApexFilesByName()
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const;
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// Returns a pre-installed version of apex with the given name. Caller is
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// expected to check if there is a pre-installed apex with the given name
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// using |HasPreinstalledVersion| function.
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ApexFileRef GetPreInstalledApex(const std::string& name) const;
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// Returns a data version of apex with the given name. Caller is
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// expected to check if there is a data apex with the given name
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// using |HasDataVersion| function.
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ApexFileRef GetDataApex(const std::string& name) const;
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// Clears ApexFileRepostiry.
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// Only use in tests.
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void Reset(const std::string& decompression_dir = kApexDecompressedDir) {
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pre_installed_store_.clear();
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data_store_.clear();
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decompression_dir_ = decompression_dir;
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}
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private:
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// Non-copyable && non-moveable.
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ApexFileRepository(const ApexFileRepository&) = delete;
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ApexFileRepository& operator=(const ApexFileRepository&) = delete;
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ApexFileRepository& operator=(ApexFileRepository&&) = delete;
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ApexFileRepository(ApexFileRepository&&) = delete;
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// Scans apexes in the given directory and adds collected data into
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// |pre_installed_store_|.
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android::base::Result<void> ScanBuiltInDir(const std::string& dir);
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std::unordered_map<std::string, ApexFile> pre_installed_store_, data_store_;
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// Decompression directory which will be used to determine if apex is
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// decompressed or not
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std::string decompression_dir_;
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};
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} // namespace apex
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} // namespace android
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