host/commands/launch/main.cc - device/google/cuttlefish_common - Git at Google

 /*
  * Copyright (C) 2017 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 <limits.h>
 #include <signal.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/wait.h>
 #include <fcntl.h>
 #include <unistd.h>

 #include <algorithm>
 #include <functional>
 #include <iostream>
 #include <fstream>
 #include <iomanip>
 #include <memory>
 #include <sstream>
 #include <string>
 #include <thread>
 #include <vector>

 #include <gflags/gflags.h>
 #include <glog/logging.h>
 #include <host/libs/vm_manager/crosvm_manager.h>

 #include "common/libs/fs/shared_fd.h"
 #include "common/libs/fs/shared_select.h"
 #include "common/libs/strings/str_split.h"
 #include "common/libs/utils/environment.h"
 #include "common/libs/utils/files.h"
 #include "common/libs/utils/subprocess.h"
 #include "common/libs/utils/size_utils.h"
 #include "common/vsoc/lib/vsoc_memory.h"
 #include "common/vsoc/shm/screen_layout.h"
 #include "host/commands/launch/boot_image_unpacker.h"
 #include "host/commands/launch/data_image.h"
 #include "host/commands/launch/flags.h"
 #include "host/commands/launch/launch.h"
 #include "host/commands/launch/launcher_defs.h"
 #include "host/commands/launch/process_monitor.h"
 #include "host/commands/launch/vsoc_shared_memory.h"
 #include "host/libs/config/cuttlefish_config.h"
 #include "host/commands/kernel_log_monitor/kernel_log_server.h"
 #include "host/libs/vm_manager/vm_manager.h"
 #include "host/libs/vm_manager/qemu_manager.h"

 using vsoc::GetPerInstanceDefault;
 using cvd::LauncherExitCodes;

 namespace {

 cvd::OnSocketReadyCb GetOnSubprocessExitCallback(
     const vsoc::CuttlefishConfig& config) {
   if (config.restart_subprocesses()) {
     return cvd::ProcessMonitor::RestartOnExitCb;
   } else {
     return cvd::ProcessMonitor::DoNotMonitorCb;
   }
 }

 // Maintains the state of the boot process, once a final state is reached
 // (success or failure) it sends the appropriate exit code to the foreground
 // launcher process
 class CvdBootStateMachine {
  public:
   CvdBootStateMachine(cvd::SharedFD fg_launcher_pipe)
       : fg_launcher_pipe_(fg_launcher_pipe), state_(kBootStarted) {}

   // Returns true if the machine is left in a final state
   bool OnBootEvtReceived(cvd::SharedFD boot_events_pipe) {
     monitor::BootEvent evt;
     auto bytes_read = boot_events_pipe->Read(&evt, sizeof(evt));
     if (bytes_read != sizeof(evt)) {
       LOG(ERROR) << "Fail to read a complete event, read " << bytes_read
                  << " bytes only instead of the expected " << sizeof(evt);
       state_ |= kGuestBootFailed;
     } else if (evt == monitor::BootEvent::BootCompleted) {
       LOG(INFO) << "Virtual device booted successfully";
       state_ |= kGuestBootCompleted;
     } else if (evt == monitor::BootEvent::BootFailed) {
       LOG(ERROR) << "Virtual device failed to boot";
       state_ |= kGuestBootFailed;
     }  // Ignore the other signals

     return MaybeWriteToForegroundLauncher();
   }

   bool  OnE2eTestCompleted(int exit_code) {
     if (exit_code != 0) {
       LOG(ERROR) << "VSoC e2e test failed";
       state_ |= kE2eTestFailed;
     } else {
       LOG(INFO) << "VSoC e2e test passed";
       state_ |= kE2eTestPassed;
     }
     return MaybeWriteToForegroundLauncher();
   }

   bool BootCompleted() const {
     return state_ == (kGuestBootCompleted | kE2eTestPassed);
   }

   bool BootFailed() const {
     return state_ & (kGuestBootFailed | kE2eTestFailed);
   }

  private:
   void SendExitCode(cvd::LauncherExitCodes exit_code) {
     fg_launcher_pipe_->Write(&exit_code, sizeof(exit_code));
     // The foreground process will exit after receiving the exit code, if we try
     // to write again we'll get a SIGPIPE
     fg_launcher_pipe_->Close();
   }
   bool MaybeWriteToForegroundLauncher() {
     if (fg_launcher_pipe_->IsOpen()) {
       if (BootCompleted()) {
         SendExitCode(cvd::LauncherExitCodes::kSuccess);
       } else if (state_ & kGuestBootFailed) {
         SendExitCode(cvd::LauncherExitCodes::kVirtualDeviceBootFailed);
       } else if (state_ & kE2eTestFailed) {
         SendExitCode(cvd::LauncherExitCodes::kE2eTestFailed);
       } else {
         // No final state was reached
         return false;
       }
     }
     // Either we sent the code before or just sent it, in any case the state is
     // final
     return true;
   }

   cvd::SharedFD fg_launcher_pipe_;
   int state_;
   static const int kBootStarted = 0;
   static const int kGuestBootCompleted = 1 << 0;
   static const int kGuestBootFailed = 1 << 1;
   static const int kE2eTestPassed = 1 << 2;
   static const int kE2eTestFailed = 1 << 3;
 };

 // Abuse the process monitor to make it call us back when boot events are ready
 void SetUpHandlingOfBootEvents(
     cvd::ProcessMonitor* process_monitor, cvd::SharedFD boot_events_pipe,
     std::shared_ptr<CvdBootStateMachine> state_machine) {
   process_monitor->MonitorExistingSubprocess(
       // A dummy command, so logs are desciptive
       cvd::Command("boot_events_listener"),
       // A dummy subprocess, with the boot events pipe as control socket
       cvd::Subprocess(-1, boot_events_pipe),
       [boot_events_pipe, state_machine](cvd::MonitorEntry*) {
         auto sent_code = state_machine->OnBootEvtReceived(boot_events_pipe);
         return !sent_code;
       });
 }

 void LaunchE2eTestIfEnabled(cvd::ProcessMonitor* process_monitor,
                             std::shared_ptr<CvdBootStateMachine> state_machine,
                             const vsoc::CuttlefishConfig& config) {
   std::string e2e_test_cmd = config.e2e_test_binary();
   if (!config.run_e2e_test() || config.hardware_name() != "vsoc") {
     // Run a command that always succeeds if we are not running e2e tests
     // TODO make the state machine aware of the fact that the tests may not run
     e2e_test_cmd = "/bin/true";
   }
   process_monitor->StartSubprocess(
       cvd::Command(e2e_test_cmd),
       [state_machine](cvd::MonitorEntry* entry) {
         auto test_result = entry->proc->Wait();
         state_machine->OnE2eTestCompleted(test_result);
         return false;
       });
 }

 bool WriteCuttlefishEnvironment(const vsoc::CuttlefishConfig& config) {
   auto env = cvd::SharedFD::Open(config.cuttlefish_env_path().c_str(),
                                  O_CREAT | O_RDWR, 0755);
   if (!env->IsOpen()) {
     LOG(ERROR) << "Unable to create cuttlefish.env file";
     return false;
   }
   std::string config_env = "export CUTTLEFISH_PER_INSTANCE_PATH=\"" +
                            config.PerInstancePath(".") + "\"\n";
   config_env += "export ANDROID_SERIAL=";
   if (AdbUsbEnabled(config)) {
     config_env += config.serial_number();
   } else {
     config_env += "127.0.0.1:" + std::to_string(GetHostPort());
   }
   config_env += "\n";
   env->Write(config_env.c_str(), config_env.size());
   return true;
 }

 // Forks and returns the write end of a pipe to the child process. The parent
 // process waits for boot events to come through the pipe and exits accordingly.
 cvd::SharedFD DaemonizeLauncher(const vsoc::CuttlefishConfig& config) {
   cvd::SharedFD read_end, write_end;
   if (!cvd::SharedFD::Pipe(&read_end, &write_end)) {
     LOG(ERROR) << "Unable to create pipe";
     return cvd::SharedFD(); // a closed FD
   }
   auto pid = fork();
   if (pid) {
     // Explicitly close here, otherwise we may end up reading forever if the
     // child process dies.
     write_end->Close();
     LauncherExitCodes exit_code;
     auto bytes_read = read_end->Read(&exit_code, sizeof(exit_code));
     if (bytes_read != sizeof(exit_code)) {
       LOG(ERROR) << "Failed to read a complete exit code, read " << bytes_read
                  << " bytes only instead of the expected " << sizeof(exit_code);
       exit_code = LauncherExitCodes::kPipeIOError;
     } else if (exit_code == LauncherExitCodes::kSuccess) {
       LOG(INFO) << "Virtual device booted successfully";
     } else if (exit_code == LauncherExitCodes::kVirtualDeviceBootFailed) {
       LOG(ERROR) << "Virtual device failed to boot";
     } else if (exit_code == LauncherExitCodes::kE2eTestFailed) {
       LOG(ERROR) << "Host VSoC region end to end test failed";
     } else {
       LOG(ERROR) << "Unexpected exit code: " << exit_code;
     }
     std::exit(exit_code);
   } else {
     // The child returns the write end of the pipe
     if (daemon(/*nochdir*/ 1, /*noclose*/ 1) != 0) {
       LOG(ERROR) << "Failed to daemonize child process: " << strerror(errno);
       std::exit(LauncherExitCodes::kDaemonizationError);
     }
     // Redirect standard I/O
     auto log_path = config.launcher_log_path();
     auto log =
         cvd::SharedFD::Open(log_path.c_str(), O_CREAT | O_WRONLY | O_TRUNC,
                             S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
     if (!log->IsOpen()) {
       LOG(ERROR) << "Failed to create launcher log file: " << log->StrError();
       std::exit(LauncherExitCodes::kDaemonizationError);
     }
     auto dev_null = cvd::SharedFD::Open("/dev/null", O_RDONLY);
     if (!dev_null->IsOpen()) {
       LOG(ERROR) << "Failed to open /dev/null: " << dev_null->StrError();
       std::exit(LauncherExitCodes::kDaemonizationError);
     }
     if (dev_null->UNMANAGED_Dup2(0) < 0) {
       LOG(ERROR) << "Failed dup2 stdin: " << dev_null->StrError();
       std::exit(LauncherExitCodes::kDaemonizationError);
     }
     if (log->UNMANAGED_Dup2(1) < 0) {
       LOG(ERROR) << "Failed dup2 stdout: " << log->StrError();
       std::exit(LauncherExitCodes::kDaemonizationError);
     }
     if (log->UNMANAGED_Dup2(2) < 0) {
       LOG(ERROR) << "Failed dup2 seterr: " << log->StrError();
       std::exit(LauncherExitCodes::kDaemonizationError);
     }

     read_end->Close();
     return write_end;
   }
 }

 // Stops the device. If this function is successful it returns on a child of the
 // launcher (after it killed the laucher) and it should exit immediately
 bool StopCvd(vm_manager::VmManager* vm_manager) {
   vm_manager->Stop();
   auto pgid = getpgid(0);
   auto child_pid = fork();
   if (child_pid > 0) {
     // The parent just waits for the child to kill it.
     int wstatus;
     waitpid(child_pid, &wstatus, 0);
     LOG(ERROR) << "The forked child exited before delivering signal with "
                   "status: "
                << wstatus;
     // If waitpid returns it means the child exited before the signal was
     // delivered, notify the client of the error and continue serving
     return false;
   } else if (child_pid == 0) {
     // The child makes sure it is in a different process group before
     // killing everyone on its parent's
     // This call should never fail (see SETPGID(2))
     if (setpgid(0, 0) != 0) {
       LOG(ERROR) << "setpgid failed (" << strerror(errno)
                  << ") the launcher's child is about to kill itself";
     }
     killpg(pgid, SIGKILL);
     return true;
   } else {
     // The fork failed, the system is in pretty bad shape
     LOG(FATAL) << "Unable to fork before on Stop: " << strerror(errno);
     return false;
   }
 }

 void ServerLoop(cvd::SharedFD server,
                 vm_manager::VmManager* vm_manager) {
   while (true) {
     // TODO: use select to handle simultaneous connections.
     auto client = cvd::SharedFD::Accept(*server);
     cvd::LauncherAction action;
     while (client->IsOpen() && client->Read(&action, sizeof(action)) > 0) {
       switch (action) {
         case cvd::LauncherAction::kStop:
           if (StopCvd(vm_manager)) {
             auto response = cvd::LauncherResponse::kSuccess;
             client->Write(&response, sizeof(response));
             std::exit(0);
           } else {
             auto response = cvd::LauncherResponse::kError;
             client->Write(&response, sizeof(response));
           }
           break;
         default:
           LOG(ERROR) << "Unrecognized launcher action: "
                      << static_cast<char>(action);
           auto response = cvd::LauncherResponse::kError;
           client->Write(&response, sizeof(response));
       }
     }
   }
 }
 }  // namespace

 int main(int argc, char** argv) {
   ::android::base::InitLogging(argv, android::base::StderrLogger);

   auto config = InitFilesystemAndCreateConfig(&argc, &argv);

   auto vm_manager = vm_manager::VmManager::Get(config->vm_manager(), config);

   // Check host configuration
   std::vector<std::string> config_commands;
   if (!vm_manager->ValidateHostConfiguration(&config_commands)) {
     LOG(ERROR) << "Validation of user configuration failed";
     std::cout << "Execute the following to correctly configure:" << std::endl;
     for (auto& command : config_commands) {
       std::cout << "  " << command << std::endl;
     }
     std::cout << "You may need to logout for the changes to take effect"
               << std::endl;
     return LauncherExitCodes::kInvalidHostConfiguration;
   }

   if (!WriteCuttlefishEnvironment(*config)) {
     LOG(ERROR) << "Unable to write cuttlefish environment file";
   }

   LOG(INFO) << "The following files contain useful debugging information:";
   if (config->run_as_daemon()) {
     LOG(INFO) << "  Launcher log: " << config->launcher_log_path();
   }
   LOG(INFO) << "  Android's logcat output: " << config->logcat_path();
   LOG(INFO) << "  Kernel log: " << config->PerInstancePath("kernel.log");
   LOG(INFO) << "  Instance configuration: " << GetConfigFilePath(*config);
   LOG(INFO) << "  Instance environment: " << config->cuttlefish_env_path();
   LOG(INFO) << "To access the console run: socat file:$(tty),raw,echo=0 "
             << config->console_path();

   auto launcher_monitor_path = config->launcher_monitor_socket_path();
   auto launcher_monitor_socket = cvd::SharedFD::SocketLocalServer(
       launcher_monitor_path.c_str(), false, SOCK_STREAM, 0666);
   if (!launcher_monitor_socket->IsOpen()) {
     LOG(ERROR) << "Error when opening launcher server: "
                << launcher_monitor_socket->StrError();
     return cvd::LauncherExitCodes::kMonitorCreationFailed;
   }
   cvd::SharedFD foreground_launcher_pipe;
   if (config->run_as_daemon()) {
     foreground_launcher_pipe = DaemonizeLauncher(*config);
     if (!foreground_launcher_pipe->IsOpen()) {
       return LauncherExitCodes::kDaemonizationError;
     }
   } else {
     // Make sure the launcher runs in its own process group even when running in
     // foreground
     if (getsid(0) != getpid()) {
       int retval = setpgid(0, 0);
       if (retval) {
         LOG(ERROR) << "Failed to create new process group: " << strerror(errno);
         std::exit(LauncherExitCodes::kProcessGroupError);
       }
     }
   }

   auto boot_state_machine =
       std::make_shared<CvdBootStateMachine>(foreground_launcher_pipe);

   // Monitor and restart host processes supporting the CVD
   cvd::ProcessMonitor process_monitor;

   cvd::SharedFD boot_events_pipe;
   // Only subscribe to boot events if running as daemon
   process_monitor.StartSubprocess(
       GetKernelLogMonitorCommand(*config,
                                  config->run_as_daemon()
                                    ? &boot_events_pipe
                                    : nullptr),
       GetOnSubprocessExitCallback(*config));

   SetUpHandlingOfBootEvents(&process_monitor, boot_events_pipe,
                             boot_state_machine);

   LaunchUsbServerIfEnabled(*config, &process_monitor);

   LaunchIvServerIfEnabled(&process_monitor, *config);
   // Launch the e2e tests after the ivserver is ready
   // TODO move this to launch.cc and make it
   LaunchE2eTestIfEnabled(&process_monitor, boot_state_machine, *config);

   // Start the guest VM
   process_monitor.StartSubprocess(vm_manager->StartCommand(),
                                   GetOnSubprocessExitCallback(*config));

   // Start other host processes
   LaunchSocketForwardProxyIfEnabled(&process_monitor, *config);
   LaunchSocketVsockProxyIfEnabled(&process_monitor, *config);
   LaunchVNCServerIfEnabled(*config, &process_monitor,
                            GetOnSubprocessExitCallback(*config));
   LaunchStreamAudioIfEnabled(*config, &process_monitor,
                              GetOnSubprocessExitCallback(*config));
   LaunchAdbConnectorIfEnabled(&process_monitor, *config);

   ServerLoop(launcher_monitor_socket, vm_manager); // Should not return
   LOG(ERROR) << "The server loop returned, it should never happen!!";
   return cvd::LauncherExitCodes::kServerError;
 }
	/*
	* Copyright (C) 2017 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 <limits.h>
	#include <signal.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <sys/types.h>
	#include <sys/stat.h>
	#include <sys/wait.h>
	#include <fcntl.h>
	#include <unistd.h>

	#include <algorithm>
	#include <functional>
	#include <iostream>
	#include <fstream>
	#include <iomanip>
	#include <memory>
	#include <sstream>
	#include <string>
	#include <thread>
	#include <vector>

	#include <gflags/gflags.h>
	#include <glog/logging.h>
	#include <host/libs/vm_manager/crosvm_manager.h>

	#include "common/libs/fs/shared_fd.h"
	#include "common/libs/fs/shared_select.h"
	#include "common/libs/strings/str_split.h"
	#include "common/libs/utils/environment.h"
	#include "common/libs/utils/files.h"
	#include "common/libs/utils/subprocess.h"
	#include "common/libs/utils/size_utils.h"
	#include "common/vsoc/lib/vsoc_memory.h"
	#include "common/vsoc/shm/screen_layout.h"
	#include "host/commands/launch/boot_image_unpacker.h"
	#include "host/commands/launch/data_image.h"
	#include "host/commands/launch/flags.h"
	#include "host/commands/launch/launch.h"
	#include "host/commands/launch/launcher_defs.h"
	#include "host/commands/launch/process_monitor.h"
	#include "host/commands/launch/vsoc_shared_memory.h"
	#include "host/libs/config/cuttlefish_config.h"
	#include "host/commands/kernel_log_monitor/kernel_log_server.h"
	#include "host/libs/vm_manager/vm_manager.h"
	#include "host/libs/vm_manager/qemu_manager.h"

	using vsoc::GetPerInstanceDefault;
	using cvd::LauncherExitCodes;

	namespace {

	cvd::OnSocketReadyCb GetOnSubprocessExitCallback(
	const vsoc::CuttlefishConfig& config) {
	if (config.restart_subprocesses()) {
	return cvd::ProcessMonitor::RestartOnExitCb;
	} else {
	return cvd::ProcessMonitor::DoNotMonitorCb;
	}
	}

	// Maintains the state of the boot process, once a final state is reached
	// (success or failure) it sends the appropriate exit code to the foreground
	// launcher process
	class CvdBootStateMachine {
	public:
	CvdBootStateMachine(cvd::SharedFD fg_launcher_pipe)
	: fg_launcher_pipe_(fg_launcher_pipe), state_(kBootStarted) {}

	// Returns true if the machine is left in a final state
	bool OnBootEvtReceived(cvd::SharedFD boot_events_pipe) {
	monitor::BootEvent evt;
	auto bytes_read = boot_events_pipe->Read(&evt, sizeof(evt));
	if (bytes_read != sizeof(evt)) {
	LOG(ERROR) << "Fail to read a complete event, read " << bytes_read
	<< " bytes only instead of the expected " << sizeof(evt);
	state_ \|= kGuestBootFailed;
	} else if (evt == monitor::BootEvent::BootCompleted) {
	LOG(INFO) << "Virtual device booted successfully";
	state_ \|= kGuestBootCompleted;
	} else if (evt == monitor::BootEvent::BootFailed) {
	LOG(ERROR) << "Virtual device failed to boot";
	state_ \|= kGuestBootFailed;
	} // Ignore the other signals

	return MaybeWriteToForegroundLauncher();
	}

	bool OnE2eTestCompleted(int exit_code) {
	if (exit_code != 0) {
	LOG(ERROR) << "VSoC e2e test failed";
	state_ \|= kE2eTestFailed;
	} else {
	LOG(INFO) << "VSoC e2e test passed";
	state_ \|= kE2eTestPassed;
	}
	return MaybeWriteToForegroundLauncher();
	}

	bool BootCompleted() const {
	return state_ == (kGuestBootCompleted \| kE2eTestPassed);
	}

	bool BootFailed() const {
	return state_ & (kGuestBootFailed \| kE2eTestFailed);
	}

	private:
	void SendExitCode(cvd::LauncherExitCodes exit_code) {
	fg_launcher_pipe_->Write(&exit_code, sizeof(exit_code));
	// The foreground process will exit after receiving the exit code, if we try
	// to write again we'll get a SIGPIPE
	fg_launcher_pipe_->Close();
	}
	bool MaybeWriteToForegroundLauncher() {
	if (fg_launcher_pipe_->IsOpen()) {
	if (BootCompleted()) {
	SendExitCode(cvd::LauncherExitCodes::kSuccess);
	} else if (state_ & kGuestBootFailed) {
	SendExitCode(cvd::LauncherExitCodes::kVirtualDeviceBootFailed);
	} else if (state_ & kE2eTestFailed) {
	SendExitCode(cvd::LauncherExitCodes::kE2eTestFailed);
	} else {
	// No final state was reached
	return false;
	}
	}
	// Either we sent the code before or just sent it, in any case the state is
	// final
	return true;
	}

	cvd::SharedFD fg_launcher_pipe_;
	int state_;
	static const int kBootStarted = 0;
	static const int kGuestBootCompleted = 1 << 0;
	static const int kGuestBootFailed = 1 << 1;
	static const int kE2eTestPassed = 1 << 2;
	static const int kE2eTestFailed = 1 << 3;
	};

	// Abuse the process monitor to make it call us back when boot events are ready
	void SetUpHandlingOfBootEvents(
	cvd::ProcessMonitor* process_monitor, cvd::SharedFD boot_events_pipe,
	std::shared_ptr<CvdBootStateMachine> state_machine) {
	process_monitor->MonitorExistingSubprocess(
	// A dummy command, so logs are desciptive
	cvd::Command("boot_events_listener"),
	// A dummy subprocess, with the boot events pipe as control socket
	cvd::Subprocess(-1, boot_events_pipe),
	[boot_events_pipe, state_machine](cvd::MonitorEntry*) {
	auto sent_code = state_machine->OnBootEvtReceived(boot_events_pipe);
	return !sent_code;
	});
	}

	void LaunchE2eTestIfEnabled(cvd::ProcessMonitor* process_monitor,
	std::shared_ptr<CvdBootStateMachine> state_machine,
	const vsoc::CuttlefishConfig& config) {
	std::string e2e_test_cmd = config.e2e_test_binary();
	if (!config.run_e2e_test() \|\| config.hardware_name() != "vsoc") {
	// Run a command that always succeeds if we are not running e2e tests
	// TODO make the state machine aware of the fact that the tests may not run
	e2e_test_cmd = "/bin/true";
	}
	process_monitor->StartSubprocess(
	cvd::Command(e2e_test_cmd),
	[state_machine](cvd::MonitorEntry* entry) {
	auto test_result = entry->proc->Wait();
	state_machine->OnE2eTestCompleted(test_result);
	return false;
	});
	}

	bool WriteCuttlefishEnvironment(const vsoc::CuttlefishConfig& config) {
	auto env = cvd::SharedFD::Open(config.cuttlefish_env_path().c_str(),
	O_CREAT \| O_RDWR, 0755);
	if (!env->IsOpen()) {
	LOG(ERROR) << "Unable to create cuttlefish.env file";
	return false;
	}
	std::string config_env = "export CUTTLEFISH_PER_INSTANCE_PATH=\"" +
	config.PerInstancePath(".") + "\"\n";
	config_env += "export ANDROID_SERIAL=";
	if (AdbUsbEnabled(config)) {
	config_env += config.serial_number();
	} else {
	config_env += "127.0.0.1:" + std::to_string(GetHostPort());
	}
	config_env += "\n";
	env->Write(config_env.c_str(), config_env.size());
	return true;
	}

	// Forks and returns the write end of a pipe to the child process. The parent
	// process waits for boot events to come through the pipe and exits accordingly.
	cvd::SharedFD DaemonizeLauncher(const vsoc::CuttlefishConfig& config) {
	cvd::SharedFD read_end, write_end;
	if (!cvd::SharedFD::Pipe(&read_end, &write_end)) {
	LOG(ERROR) << "Unable to create pipe";
	return cvd::SharedFD(); // a closed FD
	}
	auto pid = fork();
	if (pid) {
	// Explicitly close here, otherwise we may end up reading forever if the
	// child process dies.
	write_end->Close();
	LauncherExitCodes exit_code;
	auto bytes_read = read_end->Read(&exit_code, sizeof(exit_code));
	if (bytes_read != sizeof(exit_code)) {
	LOG(ERROR) << "Failed to read a complete exit code, read " << bytes_read
	<< " bytes only instead of the expected " << sizeof(exit_code);
	exit_code = LauncherExitCodes::kPipeIOError;
	} else if (exit_code == LauncherExitCodes::kSuccess) {
	LOG(INFO) << "Virtual device booted successfully";
	} else if (exit_code == LauncherExitCodes::kVirtualDeviceBootFailed) {
	LOG(ERROR) << "Virtual device failed to boot";
	} else if (exit_code == LauncherExitCodes::kE2eTestFailed) {
	LOG(ERROR) << "Host VSoC region end to end test failed";
	} else {
	LOG(ERROR) << "Unexpected exit code: " << exit_code;
	}
	std::exit(exit_code);
	} else {
	// The child returns the write end of the pipe
	if (daemon(/nochdir/ 1, /noclose/ 1) != 0) {
	LOG(ERROR) << "Failed to daemonize child process: " << strerror(errno);
	std::exit(LauncherExitCodes::kDaemonizationError);
	}
	// Redirect standard I/O
	auto log_path = config.launcher_log_path();
	auto log =
	cvd::SharedFD::Open(log_path.c_str(), O_CREAT \| O_WRONLY \| O_TRUNC,
	S_IRUSR \| S_IWUSR \| S_IRGRP \| S_IWGRP);
	if (!log->IsOpen()) {
	LOG(ERROR) << "Failed to create launcher log file: " << log->StrError();
	std::exit(LauncherExitCodes::kDaemonizationError);
	}
	auto dev_null = cvd::SharedFD::Open("/dev/null", O_RDONLY);
	if (!dev_null->IsOpen()) {
	LOG(ERROR) << "Failed to open /dev/null: " << dev_null->StrError();
	std::exit(LauncherExitCodes::kDaemonizationError);
	}
	if (dev_null->UNMANAGED_Dup2(0) < 0) {
	LOG(ERROR) << "Failed dup2 stdin: " << dev_null->StrError();
	std::exit(LauncherExitCodes::kDaemonizationError);
	}
	if (log->UNMANAGED_Dup2(1) < 0) {
	LOG(ERROR) << "Failed dup2 stdout: " << log->StrError();
	std::exit(LauncherExitCodes::kDaemonizationError);
	}
	if (log->UNMANAGED_Dup2(2) < 0) {
	LOG(ERROR) << "Failed dup2 seterr: " << log->StrError();
	std::exit(LauncherExitCodes::kDaemonizationError);
	}

	read_end->Close();
	return write_end;
	}
	}

	// Stops the device. If this function is successful it returns on a child of the
	// launcher (after it killed the laucher) and it should exit immediately
	bool StopCvd(vm_manager::VmManager* vm_manager) {
	vm_manager->Stop();
	auto pgid = getpgid(0);
	auto child_pid = fork();
	if (child_pid > 0) {
	// The parent just waits for the child to kill it.
	int wstatus;
	waitpid(child_pid, &wstatus, 0);
	LOG(ERROR) << "The forked child exited before delivering signal with "
	"status: "
	<< wstatus;
	// If waitpid returns it means the child exited before the signal was
	// delivered, notify the client of the error and continue serving
	return false;
	} else if (child_pid == 0) {
	// The child makes sure it is in a different process group before
	// killing everyone on its parent's
	// This call should never fail (see SETPGID(2))
	if (setpgid(0, 0) != 0) {
	LOG(ERROR) << "setpgid failed (" << strerror(errno)
	<< ") the launcher's child is about to kill itself";
	}
	killpg(pgid, SIGKILL);
	return true;
	} else {
	// The fork failed, the system is in pretty bad shape
	LOG(FATAL) << "Unable to fork before on Stop: " << strerror(errno);
	return false;
	}
	}

	void ServerLoop(cvd::SharedFD server,
	vm_manager::VmManager* vm_manager) {
	while (true) {
	// TODO: use select to handle simultaneous connections.
	auto client = cvd::SharedFD::Accept(*server);
	cvd::LauncherAction action;
	while (client->IsOpen() && client->Read(&action, sizeof(action)) > 0) {
	switch (action) {
	case cvd::LauncherAction::kStop:
	if (StopCvd(vm_manager)) {
	auto response = cvd::LauncherResponse::kSuccess;
	client->Write(&response, sizeof(response));
	std::exit(0);
	} else {
	auto response = cvd::LauncherResponse::kError;
	client->Write(&response, sizeof(response));
	}
	break;
	default:
	LOG(ERROR) << "Unrecognized launcher action: "
	<< static_cast<char>(action);
	auto response = cvd::LauncherResponse::kError;
	client->Write(&response, sizeof(response));
	}
	}
	}
	}
	} // namespace

	int main(int argc, char** argv) {
	::android::base::InitLogging(argv, android::base::StderrLogger);

	auto config = InitFilesystemAndCreateConfig(&argc, &argv);

	auto vm_manager = vm_manager::VmManager::Get(config->vm_manager(), config);

	// Check host configuration
	std::vector<std::string> config_commands;
	if (!vm_manager->ValidateHostConfiguration(&config_commands)) {
	LOG(ERROR) << "Validation of user configuration failed";
	std::cout << "Execute the following to correctly configure:" << std::endl;
	for (auto& command : config_commands) {
	std::cout << " " << command << std::endl;
	}
	std::cout << "You may need to logout for the changes to take effect"
	<< std::endl;
	return LauncherExitCodes::kInvalidHostConfiguration;
	}

	if (!WriteCuttlefishEnvironment(*config)) {
	LOG(ERROR) << "Unable to write cuttlefish environment file";
	}

	LOG(INFO) << "The following files contain useful debugging information:";
	if (config->run_as_daemon()) {
	LOG(INFO) << " Launcher log: " << config->launcher_log_path();
	}
	LOG(INFO) << " Android's logcat output: " << config->logcat_path();
	LOG(INFO) << " Kernel log: " << config->PerInstancePath("kernel.log");
	LOG(INFO) << " Instance configuration: " << GetConfigFilePath(*config);
	LOG(INFO) << " Instance environment: " << config->cuttlefish_env_path();
	LOG(INFO) << "To access the console run: socat file:$(tty),raw,echo=0 "
	<< config->console_path();

	auto launcher_monitor_path = config->launcher_monitor_socket_path();
	auto launcher_monitor_socket = cvd::SharedFD::SocketLocalServer(
	launcher_monitor_path.c_str(), false, SOCK_STREAM, 0666);
	if (!launcher_monitor_socket->IsOpen()) {
	LOG(ERROR) << "Error when opening launcher server: "
	<< launcher_monitor_socket->StrError();
	return cvd::LauncherExitCodes::kMonitorCreationFailed;
	}
	cvd::SharedFD foreground_launcher_pipe;
	if (config->run_as_daemon()) {
	foreground_launcher_pipe = DaemonizeLauncher(*config);
	if (!foreground_launcher_pipe->IsOpen()) {
	return LauncherExitCodes::kDaemonizationError;
	}
	} else {
	// Make sure the launcher runs in its own process group even when running in
	// foreground
	if (getsid(0) != getpid()) {
	int retval = setpgid(0, 0);
	if (retval) {
	LOG(ERROR) << "Failed to create new process group: " << strerror(errno);
	std::exit(LauncherExitCodes::kProcessGroupError);
	}
	}
	}

	auto boot_state_machine =
	std::make_shared<CvdBootStateMachine>(foreground_launcher_pipe);

	// Monitor and restart host processes supporting the CVD
	cvd::ProcessMonitor process_monitor;

	cvd::SharedFD boot_events_pipe;
	// Only subscribe to boot events if running as daemon
	process_monitor.StartSubprocess(
	GetKernelLogMonitorCommand(*config,
	config->run_as_daemon()
	? &boot_events_pipe
	: nullptr),
	GetOnSubprocessExitCallback(*config));

	SetUpHandlingOfBootEvents(&process_monitor, boot_events_pipe,
	boot_state_machine);

	LaunchUsbServerIfEnabled(*config, &process_monitor);

	LaunchIvServerIfEnabled(&process_monitor, *config);
	// Launch the e2e tests after the ivserver is ready
	// TODO move this to launch.cc and make it
	LaunchE2eTestIfEnabled(&process_monitor, boot_state_machine, *config);

	// Start the guest VM
	process_monitor.StartSubprocess(vm_manager->StartCommand(),
	GetOnSubprocessExitCallback(*config));

	// Start other host processes
	LaunchSocketForwardProxyIfEnabled(&process_monitor, *config);
	LaunchSocketVsockProxyIfEnabled(&process_monitor, *config);
	LaunchVNCServerIfEnabled(*config, &process_monitor,
	GetOnSubprocessExitCallback(*config));
	LaunchStreamAudioIfEnabled(*config, &process_monitor,
	GetOnSubprocessExitCallback(*config));
	LaunchAdbConnectorIfEnabled(&process_monitor, *config);

	ServerLoop(launcher_monitor_socket, vm_manager); // Should not return
	LOG(ERROR) << "The server loop returned, it should never happen!!";
	return cvd::LauncherExitCodes::kServerError;
	}