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/boot_control_chromeos.h b/common/boot_control_chromeos.h
new file mode 100644
index 0000000..be661e8
--- /dev/null
+++ b/common/boot_control_chromeos.h
@@ -0,0 +1,85 @@
+//
+// Copyright (C) 2015 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_BOOT_CONTROL_CHROMEOS_H_
+#define UPDATE_ENGINE_COMMON_BOOT_CONTROL_CHROMEOS_H_
+
+#include <string>
+
+#include <base/callback.h>
+#include <gtest/gtest_prod.h> // for FRIEND_TEST
+
+#include "update_engine/common/boot_control_interface.h"
+
+namespace chromeos_update_engine {
+
+// The Chrome OS implementation of the BootControlInterface. This interface
+// assumes the partition names and numbers used in Chrome OS devices.
+class BootControlChromeOS : public BootControlInterface {
+ public:
+ BootControlChromeOS() = default;
+ ~BootControlChromeOS() = default;
+
+ // Initialize the BootControl instance loading the constant values. Returns
+ // whether the operation succeeded. In case of failure, normally meaning
+ // some critical failure such as we couldn't determine the slot that we
+ // booted from, the implementation will pretend that there's only one slot and
+ // therefore A/B updates are disabled.
+ bool Init();
+
+ // BootControlInterface overrides.
+ unsigned int GetNumSlots() const override;
+ BootControlInterface::Slot GetCurrentSlot() const override;
+ bool GetPartitionDevice(const std::string& partition_name,
+ BootControlInterface::Slot slot,
+ std::string* device) const override;
+ bool IsSlotBootable(BootControlInterface::Slot slot) const override;
+ bool MarkSlotUnbootable(BootControlInterface::Slot slot) override;
+ bool SetActiveBootSlot(BootControlInterface::Slot slot) override;
+ bool MarkBootSuccessfulAsync(base::Callback<void(bool)> callback) override;
+
+ private:
+ friend class BootControlChromeOSTest;
+ FRIEND_TEST(BootControlChromeOSTest, SysfsBlockDeviceTest);
+ FRIEND_TEST(BootControlChromeOSTest, GetPartitionNumberTest);
+
+ // Returns the sysfs block device for a root block device. For example,
+ // SysfsBlockDevice("/dev/sda") returns "/sys/block/sda". Returns an empty
+ // string if the input device is not of the "/dev/xyz" form.
+ static std::string SysfsBlockDevice(const std::string& device);
+
+ // Returns true if the root |device| (e.g., "/dev/sdb") is known to be
+ // removable, false otherwise.
+ static bool IsRemovableDevice(const std::string& device);
+
+ // Return the hard-coded partition number used in Chrome OS for the passed
+ // |partition_name| and |slot|. In case of invalid data, returns -1.
+ int GetPartitionNumber(const std::string partition_name,
+ BootControlInterface::Slot slot) const;
+
+ // Cached values for GetNumSlots() and GetCurrentSlot().
+ BootControlInterface::Slot num_slots_{1};
+ BootControlInterface::Slot current_slot_{BootControlInterface::kInvalidSlot};
+
+ // The block device of the disk we booted from, without the partition number.
+ std::string boot_disk_name_;
+
+ DISALLOW_COPY_AND_ASSIGN(BootControlChromeOS);
+};
+
+} // namespace chromeos_update_engine
+
+#endif // UPDATE_ENGINE_COMMON_BOOT_CONTROL_CHROMEOS_H_