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

1 files changed, 8 insertions, 20 deletions

diff --git a/payload_consumer/postinstall_runner_action_unittest.cc b/payload_consumer/postinstall_runner_action_unittest.cc
index 3b6b49a4..5a8e9508 100644
--- a/payload_consumer/postinstall_runner_action_unittest.cc
+++ b/payload_consumer/postinstall_runner_action_unittest.cc
@@ -26,7 +26,6 @@
 
 #include <base/bind.h>
 #include <base/files/file_util.h>
-#include <base/files/scoped_temp_dir.h>
 #include <base/message_loop/message_loop.h>
 #include <base/strings/string_util.h>
 #include <base/strings/stringprintf.h>
@@ -38,6 +37,7 @@
 
 #include "update_engine/common/constants.h"
 #include "update_engine/common/fake_boot_control.h"
+#include "update_engine/common/fake_hardware.h"
 #include "update_engine/common/test_utils.h"
 #include "update_engine/common/utils.h"
 
@@ -88,10 +88,6 @@ class PostinstallRunnerActionTest : public ::testing::Test {
     loop_.SetAsCurrent();
     async_signal_handler_.Init();
     subprocess_.Init(&async_signal_handler_);
-    ASSERT_TRUE(working_dir_.CreateUniqueTempDir());
-    // We use a test-specific powerwash marker file, to avoid race conditions.
-    powerwash_marker_file_ =
-        working_dir_.path().Append("factory_install_reset").value();
     // These tests use the postinstall files generated by "generate_images.sh"
     // stored in the "disk_ext2_unittest.img" image.
     postinstall_image_ =
@@ -154,14 +150,11 @@ class PostinstallRunnerActionTest : public ::testing::Test {
   brillo::AsynchronousSignalHandler async_signal_handler_;
   Subprocess subprocess_;
 
-  // A temporary working directory used for the test.
-  base::ScopedTempDir working_dir_;
-  string powerwash_marker_file_;
-
   // The path to the postinstall sample image.
   string postinstall_image_;
 
   FakeBootControl fake_boot_control_;
+  FakeHardware fake_hardware_;
   PostinstActionProcessorDelegate processor_delegate_;
 
   // The PostinstallRunnerAction delegate receiving the progress updates.
@@ -189,8 +182,7 @@ void PostinstallRunnerActionTest::RunPosinstallAction(
   install_plan.download_url = "http://127.0.0.1:8080/update";
   install_plan.powerwash_required = powerwash_required;
   feeder_action.set_obj(install_plan);
-  PostinstallRunnerAction runner_action(&fake_boot_control_,
-                                        powerwash_marker_file_.c_str());
+  PostinstallRunnerAction runner_action(&fake_boot_control_, &fake_hardware_);
   postinstall_action_ = &runner_action;
   runner_action.set_delegate(setup_action_delegate_);
   BondActions(&feeder_action, &runner_action);
@@ -216,8 +208,7 @@ void PostinstallRunnerActionTest::RunPosinstallAction(
 }
 
 TEST_F(PostinstallRunnerActionTest, ProcessProgressLineTest) {
-  PostinstallRunnerAction action(&fake_boot_control_,
-                                 powerwash_marker_file_.c_str());
+  PostinstallRunnerAction action(&fake_boot_control_, &fake_hardware_);
   testing::StrictMock<MockPostinstallRunnerActionDelegate> mock_delegate_;
   action.set_delegate(&mock_delegate_);
 
@@ -246,7 +237,7 @@ TEST_F(PostinstallRunnerActionTest, RunAsRootSimpleTest) {
   EXPECT_TRUE(processor_delegate_.processing_done_called_);
 
   // Since powerwash_required was false, this should not trigger a powerwash.
-  EXPECT_FALSE(utils::FileExists(powerwash_marker_file_.c_str()));
+  EXPECT_FALSE(fake_hardware_.IsPowerwashScheduled());
 }
 
 TEST_F(PostinstallRunnerActionTest, RunAsRootRunSymlinkFileTest) {
@@ -261,11 +252,8 @@ TEST_F(PostinstallRunnerActionTest, RunAsRootPowerwashRequiredTest) {
   RunPosinstallAction(loop.dev(), "bin/postinst_example", true);
   EXPECT_EQ(ErrorCode::kSuccess, processor_delegate_.code_);
 
-  // Check that the powerwash marker file was set.
-  string actual_cmd;
-  EXPECT_TRUE(base::ReadFileToString(base::FilePath(powerwash_marker_file_),
-                                     &actual_cmd));
-  EXPECT_EQ(kPowerwashCommand, actual_cmd);
+  // Check that powerwash was scheduled.
+  EXPECT_TRUE(fake_hardware_.IsPowerwashScheduled());
 }
 
 // Runs postinstall from a partition file that doesn't mount, so it should
@@ -276,7 +264,7 @@ TEST_F(PostinstallRunnerActionTest, RunAsRootCantMountTest) {
 
   // In case of failure, Postinstall should not signal a powerwash even if it
   // was requested.
-  EXPECT_FALSE(utils::FileExists(powerwash_marker_file_.c_str()));
+  EXPECT_FALSE(fake_hardware_.IsPowerwashScheduled());
 }
 
 // Check that the failures from the postinstall script cause the action to