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_android.cc b/common/boot_control_android.cc
new file mode 100644
index 0000000..a00fcf4
--- /dev/null
+++ b/common/boot_control_android.cc
@@ -0,0 +1,200 @@
+//
+// 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.
+//
+
+#include "update_engine/common/boot_control_android.h"
+
+#include <base/bind.h>
+#include <base/files/file_util.h>
+#include <base/logging.h>
+#include <base/strings/string_util.h>
+#include <brillo/make_unique_ptr.h>
+#include <brillo/message_loops/message_loop.h>
+#include <cutils/properties.h>
+#include <fs_mgr.h>
+
+#include "update_engine/common/utils.h"
+
+using std::string;
+
+namespace {
+
+// Open the appropriate fstab file and fallback to /fstab.device if
+// that's what's being used.
+static struct fstab* OpenFSTab() {
+ char propbuf[PROPERTY_VALUE_MAX];
+ struct fstab* fstab;
+
+ property_get("ro.hardware", propbuf, "");
+ string fstab_name = string("/fstab.") + propbuf;
+ fstab = fs_mgr_read_fstab(fstab_name.c_str());
+ if (fstab != nullptr)
+ return fstab;
+
+ fstab = fs_mgr_read_fstab("/fstab.device");
+ return fstab;
+}
+
+} // namespace
+
+
+namespace chromeos_update_engine {
+
+namespace boot_control {
+
+// Factory defined in boot_control.h.
+std::unique_ptr<BootControlInterface> CreateBootControl() {
+ std::unique_ptr<BootControlAndroid> boot_control(new BootControlAndroid());
+ if (!boot_control->Init()) {
+ return nullptr;
+ }
+ return brillo::make_unique_ptr(boot_control.release());
+}
+
+} // namespace boot_control
+
+bool BootControlAndroid::Init() {
+ const hw_module_t* hw_module;
+ int ret;
+
+ ret = hw_get_module(BOOT_CONTROL_HARDWARE_MODULE_ID, &hw_module);
+ if (ret != 0) {
+ LOG(ERROR) << "Error loading boot_control HAL implementation.";
+ return false;
+ }
+
+ module_ = reinterpret_cast<boot_control_module_t*>(const_cast<hw_module_t*>(hw_module));
+ module_->init(module_);
+
+ LOG(INFO) << "Loaded boot_control HAL "
+ << "'" << hw_module->name << "' "
+ << "version " << (hw_module->module_api_version>>8) << "."
+ << (hw_module->module_api_version&0xff) << " "
+ << "authored by '" << hw_module->author << "'.";
+ return true;
+}
+
+unsigned int BootControlAndroid::GetNumSlots() const {
+ return module_->getNumberSlots(module_);
+}
+
+BootControlInterface::Slot BootControlAndroid::GetCurrentSlot() const {
+ return module_->getCurrentSlot(module_);
+}
+
+bool BootControlAndroid::GetPartitionDevice(const string& partition_name,
+ Slot slot,
+ string* device) const {
+ struct fstab* fstab;
+ struct fstab_rec* record;
+
+ // We can't use fs_mgr to look up |partition_name| because fstab
+ // doesn't list every slot partition (it uses the slotselect option
+ // to mask the suffix).
+ //
+ // We can however assume that there's an entry for the /misc mount
+ // point and use that to get the device file for the misc
+ // partition. This helps us locate the disk that |partition_name|
+ // resides on. From there we'll assume that a by-name scheme is used
+ // so we can just replace the trailing "misc" by the given
+ // |partition_name| and suffix corresponding to |slot|, e.g.
+ //
+ // /dev/block/platform/soc.0/7824900.sdhci/by-name/misc ->
+ // /dev/block/platform/soc.0/7824900.sdhci/by-name/boot_a
+ //
+ // If needed, it's possible to relax the by-name assumption in the
+ // future by trawling /sys/block looking for the appropriate sibling
+ // of misc and then finding an entry in /dev matching the sysfs
+ // entry.
+
+ fstab = OpenFSTab();
+ if (fstab == nullptr) {
+ LOG(ERROR) << "Error opening fstab file.";
+ return false;
+ }
+ record = fs_mgr_get_entry_for_mount_point(fstab, "/misc");
+ if (record == nullptr) {
+ LOG(ERROR) << "Error finding /misc entry in fstab file.";
+ fs_mgr_free_fstab(fstab);
+ return false;
+ }
+
+ base::FilePath misc_device = base::FilePath(record->blk_device);
+ fs_mgr_free_fstab(fstab);
+
+ if (misc_device.BaseName() != base::FilePath("misc")) {
+ LOG(ERROR) << "Device file " << misc_device.value() << " for /misc "
+ << "is not in the expected format.";
+ return false;
+ }
+
+ const char* suffix = module_->getSuffix(module_, slot);
+ if (suffix == nullptr) {
+ LOG(ERROR) << "boot_control impl returned no suffix for slot "
+ << SlotName(slot);
+ return false;
+ }
+
+ base::FilePath path = misc_device.DirName().Append(partition_name + suffix);
+ if (!base::PathExists(path)) {
+ LOG(ERROR) << "Device file " << path.value() << " does not exist.";
+ return false;
+ }
+
+ *device = path.value();
+ return true;
+}
+
+bool BootControlAndroid::IsSlotBootable(Slot slot) const {
+ int ret = module_->isSlotBootable(module_, slot);
+ if (ret < 0) {
+ LOG(ERROR) << "Unable to determine if slot " << SlotName(slot)
+ << " is bootable: " << strerror(-ret);
+ return false;
+ }
+ return ret == 1;
+}
+
+bool BootControlAndroid::MarkSlotUnbootable(Slot slot) {
+ int ret = module_->setSlotAsUnbootable(module_, slot);
+ if (ret < 0) {
+ LOG(ERROR) << "Unable to mark slot " << SlotName(slot)
+ << " as bootable: " << strerror(-ret);
+ return false;
+ }
+ return ret == 0;
+}
+
+bool BootControlAndroid::SetActiveBootSlot(Slot slot) {
+ int ret = module_->setActiveBootSlot(module_, slot);
+ if (ret < 0) {
+ LOG(ERROR) << "Unable to set the active slot to slot " << SlotName(slot)
+ << ": " << strerror(-ret);
+ }
+ return ret == 0;
+}
+
+bool BootControlAndroid::MarkBootSuccessfulAsync(
+ base::Callback<void(bool)> callback) {
+ int ret = module_->markBootSuccessful(module_);
+ if (ret < 0) {
+ LOG(ERROR) << "Unable to mark boot successful: " << strerror(-ret);
+ }
+ return brillo::MessageLoop::current()->PostTask(
+ FROM_HERE, base::Bind(callback, ret == 0)) !=
+ brillo::MessageLoop::kTaskIdNull;
+}
+
+} // namespace chromeos_update_engine