Implement powerwash on Android.
Powerwash, the name for the equivalent of a factory reset or /data wipe,
can be triggered in Android by writing the desired command to the
recovery command file and rebooting into recovery.
This patch moves the powerwash scheduling/canceling logic to the
HardwareInterface and implements it on Android.
Bug: 28700985
TEST=Called update_engine_client passing POWERWASH=1, BCB is stored up
to offset 832.
Change-Id: If737fd4b9b3e2ed9bce709b3b59f22e9f0a3dc9a
diff --git a/utils_android.cc b/utils_android.cc
new file mode 100644
index 0000000..a4f1ea8
--- /dev/null
+++ b/utils_android.cc
@@ -0,0 +1,71 @@
+//
+// Copyright (C) 2016 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/utils_android.h"
+
+#include <cutils/properties.h>
+#include <fs_mgr.h>
+
+using std::string;
+
+namespace chromeos_update_engine {
+
+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 utils {
+
+bool DeviceForMountPoint(const string& mount_point, base::FilePath* device) {
+ struct fstab* fstab;
+ struct fstab_rec* record;
+
+ fstab = OpenFSTab();
+ if (fstab == nullptr) {
+ LOG(ERROR) << "Error opening fstab file.";
+ return false;
+ }
+ record = fs_mgr_get_entry_for_mount_point(fstab, mount_point.c_str());
+ if (record == nullptr) {
+ LOG(ERROR) << "Error finding " << mount_point << " entry in fstab file.";
+ fs_mgr_free_fstab(fstab);
+ return false;
+ }
+
+ *device = base::FilePath(record->blk_device);
+ fs_mgr_free_fstab(fstab);
+ return true;
+}
+
+} // namespace utils
+
+} // namespace chromeos_update_engine