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/clock_interface.h b/common/clock_interface.h
new file mode 100644
index 0000000..2228983
--- /dev/null
+++ b/common/clock_interface.h
@@ -0,0 +1,54 @@
+//
+// Copyright (C) 2013 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_CLOCK_INTERFACE_H_
+#define UPDATE_ENGINE_COMMON_CLOCK_INTERFACE_H_
+
+#include <string>
+
+#include <base/time/time.h>
+
+namespace chromeos_update_engine {
+
+// The clock interface allows access to various system clocks. The
+// sole reason for providing this as an interface is unit testing.
+// Additionally, the sole reason for the methods not being static
+// is also unit testing.
+class ClockInterface {
+ public:
+ virtual ~ClockInterface() = default;
+
+ // Gets the current time e.g. similar to base::Time::Now().
+ virtual base::Time GetWallclockTime() = 0;
+
+ // Returns monotonic time since some unspecified starting point. It
+ // is not increased when the system is sleeping nor is it affected
+ // by NTP or the user changing the time.
+ //
+ // (This is a simple wrapper around clock_gettime(2) / CLOCK_MONOTONIC_RAW.)
+ virtual base::Time GetMonotonicTime() = 0;
+
+ // Returns monotonic time since some unspecified starting point. It
+ // is increased when the system is sleeping but it's not affected
+ // by NTP or the user changing the time.
+ //
+ // (This is a simple wrapper around clock_gettime(2) / CLOCK_BOOTTIME.)
+ virtual base::Time GetBootTime() = 0;
+};
+
+} // namespace chromeos_update_engine
+
+#endif // UPDATE_ENGINE_COMMON_CLOCK_INTERFACE_H_