Split payload application code into a subdirectory.
This patch splits from the main libupdate_engine code the part that
is strictly used to download and apply a payload into a new static
library, moving the code to subdirectories. The new library is divided
in two subdirectories: common/ and payload_consumer/, and should not
depend on other update_engine files outside those two subdirectories.
The main difference between those two is that the common/ tools are more
generic and not tied to the payload consumer process, but otherwise they
are both compiled together.
There are still dependencies from the new libpayload_consumer library
into the main directory files and DBus generated files. Those will be
addressed in follow up CLs.
Bug: 25197634
Test: FEATURES=test emerge-link update_engine; `mm` on Brillo.
Change-Id: Id8d0204ea573627e6e26ca9ea17b9592ca95bc23
diff --git a/common/prefs.h b/common/prefs.h
new file mode 100644
index 0000000..f11abc3
--- /dev/null
+++ b/common/prefs.h
@@ -0,0 +1,81 @@
+//
+// Copyright (C) 2012 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.
+//
+
+#ifndef UPDATE_ENGINE_COMMON_PREFS_H_
+#define UPDATE_ENGINE_COMMON_PREFS_H_
+
+#include <map>
+#include <string>
+#include <vector>
+
+#include <base/files/file_path.h>
+
+#include "gtest/gtest_prod.h" // for FRIEND_TEST
+#include "update_engine/common/prefs_interface.h"
+
+namespace chromeos_update_engine {
+
+// Implements a preference store by storing the value associated with
+// a key in a separate file named after the key under a preference
+// store directory.
+
+class Prefs : public PrefsInterface {
+ public:
+ Prefs() = default;
+
+ // Initializes the store by associating this object with |prefs_dir|
+ // as the preference store directory. Returns true on success, false
+ // otherwise.
+ bool Init(const base::FilePath& prefs_dir);
+
+ // PrefsInterface methods.
+ bool GetString(const std::string& key, std::string* value) const override;
+ bool SetString(const std::string& key, const std::string& value) override;
+ bool GetInt64(const std::string& key, int64_t* value) const override;
+ bool SetInt64(const std::string& key, const int64_t value) override;
+ bool GetBoolean(const std::string& key, bool* value) const override;
+ bool SetBoolean(const std::string& key, const bool value) override;
+
+ bool Exists(const std::string& key) const override;
+ bool Delete(const std::string& key) override;
+
+ void AddObserver(const std::string& key,
+ ObserverInterface* observer) override;
+ void RemoveObserver(const std::string& key,
+ ObserverInterface* observer) override;
+
+ private:
+ FRIEND_TEST(PrefsTest, GetFileNameForKey);
+ FRIEND_TEST(PrefsTest, GetFileNameForKeyBadCharacter);
+ FRIEND_TEST(PrefsTest, GetFileNameForKeyEmpty);
+
+ // Sets |filename| to the full path to the file containing the data
+ // associated with |key|. Returns true on success, false otherwise.
+ bool GetFileNameForKey(const std::string& key,
+ base::FilePath* filename) const;
+
+ // Preference store directory.
+ base::FilePath prefs_dir_;
+
+ // The registered observers watching for changes.
+ std::map<std::string, std::vector<ObserverInterface*>> observers_;
+
+ DISALLOW_COPY_AND_ASSIGN(Prefs);
+};
+
+} // namespace chromeos_update_engine
+
+#endif // UPDATE_ENGINE_COMMON_PREFS_H_