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# Copyright 2019 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Implements commands for running/interacting with Fuchsia on an emulator."""
import boot_data
import logging
import os
import subprocess
import sys
import target
import tempfile
class EmuTarget(target.Target):
def __init__(self, output_dir, target_cpu, system_log_file):
"""output_dir: The directory which will contain the files that are
generated to support the emulator deployment.
target_cpu: The emulated target CPU architecture.
Can be 'x64' or 'arm64'."""
super(EmuTarget, self).__init__(output_dir, target_cpu)
self._emu_process = None
self._system_log_file = system_log_file
def __enter__(self):
return self
def _GetEmulatorName(self):
pass
def _BuildCommand(self):
"""Build the command that will be run to start Fuchsia in the emulator."""
pass
# Used by the context manager to ensure that the emulator is killed when
# the Python process exits.
def __exit__(self, exc_type, exc_val, exc_tb):
self.Shutdown();
def Start(self):
emu_command = self._BuildCommand()
# We pass a separate stdin stream. Sharing stdin across processes
# leads to flakiness due to the OS prematurely killing the stream and the
# Python script panicking and aborting.
# The precise root cause is still nebulous, but this fix works.
# See crbug.com/741194.
logging.debug('Launching %s.' % (self._GetEmulatorName()))
logging.debug(' '.join(emu_command))
# Zircon sends debug logs to serial port (see kernel.serial=legacy flag
# above). Serial port is redirected to a file through emulator stdout.
# Unless a |_system_log_file| is explicitly set, we output the kernel serial
# log to a temporary file, and print that out if we are unable to connect to
# the emulator guest, to make it easier to diagnose connectivity issues.
temporary_system_log_file = None
if self._system_log_file:
stdout = self._system_log_file
stderr = subprocess.STDOUT
else:
temporary_system_log_file = tempfile.NamedTemporaryFile('w')
stdout = temporary_system_log_file
stderr = sys.stderr
self._emu_process = subprocess.Popen(emu_command, stdin=open(os.devnull),
stdout=stdout, stderr=stderr)
try:
self._WaitUntilReady();
except target.FuchsiaTargetException:
if temporary_system_log_file:
logging.info('Kernel logs:\n' +
open(temporary_system_log_file.name, 'r').read())
raise
def Shutdown(self):
if self._IsEmuStillRunning():
logging.info('Shutting down %s' % (self._GetEmulatorName()))
self._emu_process.kill()
def _IsEmuStillRunning(self):
if not self._emu_process:
return False
return os.waitpid(self._emu_process.pid, os.WNOHANG)[0] == 0
def _GetEndpoint(self):
if not self._IsEmuStillRunning():
raise Exception('%s quit unexpectedly.' % (self._GetEmulatorName()))
return ('localhost', self._host_ssh_port)
def _GetSshConfigPath(self):
return boot_data.GetSSHConfigPath(self._output_dir)
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