#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.

from __future__ import with_statement
import codecs
import itertools
import json
import logging
import os
import re
import select
import shutil
import signal
import subprocess
import sys
import threading
import tempfile
import sqlite3
from datetime import datetime, timedelta
from string import Template

SCRIPT_DIR = os.path.abspath(os.path.realpath(os.path.dirname(sys.argv[0])))
sys.path.insert(0, SCRIPT_DIR)
import automationutils

# --------------------------------------------------------------
# TODO: this is a hack for mozbase without virtualenv, remove with bug 849900
# These paths refer to relative locations to test.zip, not the OBJDIR or SRCDIR
here = os.path.dirname(os.path.realpath(__file__))
mozbase = os.path.realpath(os.path.join(os.path.dirname(here), 'mozbase'))

if os.path.isdir(mozbase):
    for package in os.listdir(mozbase):
        package_path = os.path.join(mozbase, package)
        if package_path not in sys.path:
            sys.path.append(package_path)

import mozcrash
from mozprofile import Profile, Preferences
from mozprofile.permissions import ServerLocations

# ---------------------------------------------------------------

_DEFAULT_PREFERENCE_FILE = os.path.join(SCRIPT_DIR, 'prefs_general.js')
_DEFAULT_APPS_FILE = os.path.join(SCRIPT_DIR, 'webapps_mochitest.json')

_DEFAULT_WEB_SERVER = "127.0.0.1"
_DEFAULT_HTTP_PORT = 8888
_DEFAULT_SSL_PORT = 4443
_DEFAULT_WEBSOCKET_PORT = 9988

# from nsIPrincipal.idl
_APP_STATUS_NOT_INSTALLED = 0
_APP_STATUS_INSTALLED     = 1
_APP_STATUS_PRIVILEGED    = 2
_APP_STATUS_CERTIFIED     = 3

#expand _DIST_BIN = __XPC_BIN_PATH__
#expand _IS_WIN32 = len("__WIN32__") != 0
#expand _IS_MAC = __IS_MAC__ != 0
#expand _IS_LINUX = __IS_LINUX__ != 0
#ifdef IS_CYGWIN
#expand _IS_CYGWIN = __IS_CYGWIN__ == 1
#else
_IS_CYGWIN = False
#endif
#expand _BIN_SUFFIX = __BIN_SUFFIX__

#expand _DEFAULT_APP = "./" + __BROWSER_PATH__
#expand _CERTS_SRC_DIR = __CERTS_SRC_DIR__
#expand _IS_TEST_BUILD = __IS_TEST_BUILD__
#expand _IS_DEBUG_BUILD = __IS_DEBUG_BUILD__
#expand _CRASHREPORTER = __CRASHREPORTER__ == 1
#expand _IS_ASAN = __IS_ASAN__ == 1


if _IS_WIN32:
  import ctypes, ctypes.wintypes, time, msvcrt
else:
  import errno


def getGlobalLog():
  return _log

def resetGlobalLog(log):
  while _log.handlers:
    _log.removeHandler(_log.handlers[0])
  handler = logging.StreamHandler(log)
  _log.setLevel(logging.INFO)
  _log.addHandler(handler)

# We use the logging system here primarily because it'll handle multiple
# threads, which is needed to process the output of the server and application
# processes simultaneously.
_log = logging.getLogger()
resetGlobalLog(sys.stdout)


#################
# PROFILE SETUP #
#################

class SyntaxError(Exception):
  "Signifies a syntax error on a particular line in server-locations.txt."

  def __init__(self, lineno, msg = None):
    self.lineno = lineno
    self.msg = msg

  def __str__(self):
    s = "Syntax error on line " + str(self.lineno)
    if self.msg:
      s += ": %s." % self.msg
    else:
      s += "."
    return s


class Location:
  "Represents a location line in server-locations.txt."

  def __init__(self, scheme, host, port, options):
    self.scheme = scheme
    self.host = host
    self.port = port
    self.options = options

class Automation(object):
  """
  Runs the browser from a script, and provides useful utilities
  for setting up the browser environment.
  """

  DIST_BIN = _DIST_BIN
  IS_WIN32 = _IS_WIN32
  IS_MAC = _IS_MAC
  IS_LINUX = _IS_LINUX
  IS_CYGWIN = _IS_CYGWIN
  BIN_SUFFIX = _BIN_SUFFIX

  UNIXISH = not IS_WIN32 and not IS_MAC

  DEFAULT_APP = _DEFAULT_APP
  CERTS_SRC_DIR = _CERTS_SRC_DIR
  IS_TEST_BUILD = _IS_TEST_BUILD
  IS_DEBUG_BUILD = _IS_DEBUG_BUILD
  CRASHREPORTER = _CRASHREPORTER
  IS_ASAN = _IS_ASAN

  # timeout, in seconds
  DEFAULT_TIMEOUT = 60.0
  DEFAULT_WEB_SERVER = _DEFAULT_WEB_SERVER
  DEFAULT_HTTP_PORT = _DEFAULT_HTTP_PORT
  DEFAULT_SSL_PORT = _DEFAULT_SSL_PORT
  DEFAULT_WEBSOCKET_PORT = _DEFAULT_WEBSOCKET_PORT

  def __init__(self):
    self.log = _log
    self.lastTestSeen = "automation.py"
    self.haveDumpedScreen = False

  def setServerInfo(self, 
                    webServer = _DEFAULT_WEB_SERVER, 
                    httpPort = _DEFAULT_HTTP_PORT, 
                    sslPort = _DEFAULT_SSL_PORT,
                    webSocketPort = _DEFAULT_WEBSOCKET_PORT):
    self.webServer = webServer
    self.httpPort = httpPort
    self.sslPort = sslPort
    self.webSocketPort = webSocketPort

  @property
  def __all__(self):
    return [
           "UNIXISH",
           "IS_WIN32",
           "IS_MAC",
           "log",
           "runApp",
           "Process",
           "addCommonOptions",
           "initializeProfile",
           "DIST_BIN",
           "DEFAULT_APP",
           "CERTS_SRC_DIR",
           "environment",
           "IS_TEST_BUILD",
           "IS_DEBUG_BUILD",
           "DEFAULT_TIMEOUT",
          ]

  class Process(subprocess.Popen):
    """
    Represents our view of a subprocess.
    It adds a kill() method which allows it to be stopped explicitly.
    """

    def __init__(self,
                 args,
                 bufsize=0,
                 executable=None,
                 stdin=None,
                 stdout=None,
                 stderr=None,
                 preexec_fn=None,
                 close_fds=False,
                 shell=False,
                 cwd=None,
                 env=None,
                 universal_newlines=False,
                 startupinfo=None,
                 creationflags=0):
      _log.info("INFO | automation.py | Launching: %s", subprocess.list2cmdline(args))
      subprocess.Popen.__init__(self, args, bufsize, executable,
                                stdin, stdout, stderr,
                                preexec_fn, close_fds,
                                shell, cwd, env,
                                universal_newlines, startupinfo, creationflags)
      self.log = _log

    def kill(self):
      if Automation().IS_WIN32:
        import platform
        pid = "%i" % self.pid
        if platform.release() == "2000":
          # Windows 2000 needs 'kill.exe' from the 
          #'Windows 2000 Resource Kit tools'. (See bug 475455.)
          try:
            subprocess.Popen(["kill", "-f", pid]).wait()
          except:
            self.log.info("TEST-UNEXPECTED-FAIL | automation.py | Missing 'kill' utility to kill process with pid=%s. Kill it manually!", pid)
        else:
          # Windows XP and later.
          subprocess.Popen(["taskkill", "/F", "/PID", pid]).wait()
      else:
        os.kill(self.pid, signal.SIGKILL)

  def readLocations(self, locationsPath = "server-locations.txt"):
    """
    Reads the locations at which the Mochitest HTTP server is available from
    server-locations.txt.
    """

    locationFile = codecs.open(locationsPath, "r", "UTF-8")

    # Perhaps more detail than necessary, but it's the easiest way to make sure
    # we get exactly the format we want.  See server-locations.txt for the exact
    # format guaranteed here.
    lineRe = re.compile(r"^(?P<scheme>[a-z][-a-z0-9+.]*)"
                      r"://"
                      r"(?P<host>"
                        r"\d+\.\d+\.\d+\.\d+"
                        r"|"
                        r"(?:[a-z0-9](?:[-a-z0-9]*[a-z0-9])?\.)*"
                        r"[a-z](?:[-a-z0-9]*[a-z0-9])?"
                      r")"
                      r":"
                      r"(?P<port>\d+)"
                      r"(?:"
                      r"\s+"
                      r"(?P<options>\S+(?:,\S+)*)"
                      r")?$")
    locations = []
    lineno = 0
    seenPrimary = False
    for line in locationFile:
      lineno += 1
      if line.startswith("#") or line == "\n":
        continue
      
      match = lineRe.match(line)
      if not match:
        raise SyntaxError(lineno)

      options = match.group("options")
      if options:
        options = options.split(",")
        if "primary" in options:
          if seenPrimary:
            raise SyntaxError(lineno, "multiple primary locations")
          seenPrimary = True
      else:
        options = []

      locations.append(Location(match.group("scheme"), match.group("host"),
                                match.group("port"), options))

    if not seenPrimary:
      raise SyntaxError(lineno + 1, "missing primary location")

    return locations

  def setupPermissionsDatabase(self, profileDir, permissions):
    # Included for reftest compatibility;
    # see https://bugzilla.mozilla.org/show_bug.cgi?id=688667

    # Open database and create table
    permDB = sqlite3.connect(os.path.join(profileDir, "permissions.sqlite"))
    cursor = permDB.cursor();

    cursor.execute("PRAGMA user_version=4");

    # SQL copied from nsPermissionManager.cpp
    cursor.execute("""CREATE TABLE IF NOT EXISTS moz_hosts (
      id INTEGER PRIMARY KEY,
      host TEXT,
      type TEXT,
      permission INTEGER,
      expireType INTEGER,
      expireTime INTEGER,
      modificationTime INTEGER,
      appId INTEGER,
      isInBrowserElement INTEGER)""")

    # Insert desired permissions
    for perm in permissions.keys():
      for host,allow in permissions[perm]:
        cursor.execute("INSERT INTO moz_hosts values(NULL, ?, ?, ?, 0, 0, 0, 0, 0)",
                       (host, perm, 1 if allow else 2))

    # Commit and close
    permDB.commit()
    cursor.close()

  def initializeProfile(self, profileDir,
                              extraPrefs=None,
                              useServerLocations=False,
                              prefsPath=_DEFAULT_PREFERENCE_FILE,
                              appsPath=_DEFAULT_APPS_FILE,
                              addons=None):
    " Sets up the standard testing profile."

    extraPrefs = extraPrefs or []

    # create the profile
    prefs = {}
    locations = None
    if useServerLocations:
        locations = ServerLocations()
        locations.read(os.path.abspath('server-locations.txt'), True)
    else:
      prefs['network.proxy.type'] = 0

    prefs.update(Preferences.read_prefs(prefsPath))

    for v in extraPrefs:
      thispref = v.split("=", 1)
      if len(thispref) < 2:
        print "Error: syntax error in --setpref=" + v
        sys.exit(1)
      prefs[thispref[0]] = thispref[1]


    interpolation = {"server": "%s:%s" % (self.webServer, self.httpPort)}
    prefs = json.loads(json.dumps(prefs) % interpolation)
    for pref in prefs:
        prefs[pref] = Preferences.cast(prefs[pref])

    # load apps
    apps = None
    if appsPath and os.path.exists(appsPath):
        with open(appsPath, 'r') as apps_file:
            apps = json.load(apps_file)

    proxy = {'remote': str(self.webServer),
             'http': str(self.httpPort),
             'https': str(self.sslPort),
    # use SSL port for legacy compatibility; see
    # - https://bugzilla.mozilla.org/show_bug.cgi?id=688667#c66
    # - https://bugzilla.mozilla.org/show_bug.cgi?id=899221
    #             'ws': str(self.webSocketPort)
             'ws': str(self.sslPort)
             }

    # return profile object
    profile = Profile(profile=profileDir,
                      addons=addons,
                      locations=locations,
                      preferences=prefs,
                      restore=False,
                      apps=apps,
                      proxy=proxy)
    return profile

  def addCommonOptions(self, parser):
    "Adds command-line options which are common to mochitest and reftest."

    parser.add_option("--setpref",
                      action = "append", type = "string",
                      default = [],
                      dest = "extraPrefs", metavar = "PREF=VALUE",
                      help = "defines an extra user preference")

  def fillCertificateDB(self, profileDir, certPath, utilityPath, xrePath):
    pwfilePath = os.path.join(profileDir, ".crtdbpw")
    pwfile = open(pwfilePath, "w")
    pwfile.write("\n")
    pwfile.close()

    # Create head of the ssltunnel configuration file
    sslTunnelConfigPath = os.path.join(profileDir, "ssltunnel.cfg")
    sslTunnelConfig = open(sslTunnelConfigPath, "w")
  
    sslTunnelConfig.write("httpproxy:1\n")
    sslTunnelConfig.write("certdbdir:%s\n" % certPath)
    sslTunnelConfig.write("forward:127.0.0.1:%s\n" % self.httpPort)
    sslTunnelConfig.write("websocketserver:%s:%s\n" % (self.webServer, self.webSocketPort))
    sslTunnelConfig.write("listen:*:%s:pgo server certificate\n" % self.sslPort)

    # Configure automatic certificate and bind custom certificates, client authentication
    locations = self.readLocations()
    locations.pop(0)
    for loc in locations:
      if loc.scheme == "https" and "nocert" not in loc.options:
        customCertRE = re.compile("^cert=(?P<nickname>[0-9a-zA-Z_ ]+)")
        clientAuthRE = re.compile("^clientauth=(?P<clientauth>[a-z]+)")
        redirRE      = re.compile("^redir=(?P<redirhost>[0-9a-zA-Z_ .]+)")
        for option in loc.options:
          match = customCertRE.match(option)
          if match:
            customcert = match.group("nickname");
            sslTunnelConfig.write("listen:%s:%s:%s:%s\n" %
                      (loc.host, loc.port, self.sslPort, customcert))

          match = clientAuthRE.match(option)
          if match:
            clientauth = match.group("clientauth");
            sslTunnelConfig.write("clientauth:%s:%s:%s:%s\n" %
                      (loc.host, loc.port, self.sslPort, clientauth))

          match = redirRE.match(option)
          if match:
            redirhost = match.group("redirhost")
            sslTunnelConfig.write("redirhost:%s:%s:%s:%s\n" %
                      (loc.host, loc.port, self.sslPort, redirhost))

    sslTunnelConfig.close()

    # Pre-create the certification database for the profile
    env = self.environment(xrePath = xrePath)
    certutil = os.path.join(utilityPath, "certutil" + self.BIN_SUFFIX)
    pk12util = os.path.join(utilityPath, "pk12util" + self.BIN_SUFFIX)

    status = self.Process([certutil, "-N", "-d", profileDir, "-f", pwfilePath], env = env).wait()
    automationutils.printstatus(status, "certutil")
    if status != 0:
      return status

    # Walk the cert directory and add custom CAs and client certs
    files = os.listdir(certPath)
    for item in files:
      root, ext = os.path.splitext(item)
      if ext == ".ca":
        trustBits = "CT,,"
        if root.endswith("-object"):
          trustBits = "CT,,CT"
        status = self.Process([certutil, "-A", "-i", os.path.join(certPath, item),
                    "-d", profileDir, "-f", pwfilePath, "-n", root, "-t", trustBits],
                    env = env).wait()
        automationutils.printstatus(status, "certutil")
      if ext == ".client":
        status = self.Process([pk12util, "-i", os.path.join(certPath, item), "-w",
                    pwfilePath, "-d", profileDir], 
                    env = env).wait()
        automationutils.printstatus(status, "pk12util")

    os.unlink(pwfilePath)
    return 0

  def environment(self, env=None, xrePath=None, crashreporter=True, debugger=False, dmdPath=None, lsanPath=None):
    if xrePath == None:
      xrePath = self.DIST_BIN
    if env == None:
      env = dict(os.environ)

    ldLibraryPath = os.path.abspath(os.path.join(SCRIPT_DIR, xrePath))
    dmdLibrary = None
    preloadEnvVar = None
    if self.UNIXISH or self.IS_MAC:
      envVar = "LD_LIBRARY_PATH"
      preloadEnvVar = "LD_PRELOAD"
      if self.IS_MAC:
        envVar = "DYLD_LIBRARY_PATH"
        dmdLibrary = "libdmd.dylib"
      else: # unixish
        env['MOZILLA_FIVE_HOME'] = xrePath
        dmdLibrary = "libdmd.so"
      if envVar in env:
        ldLibraryPath = ldLibraryPath + ":" + env[envVar]
      env[envVar] = ldLibraryPath
    elif self.IS_WIN32:
      env["PATH"] = env["PATH"] + ";" + str(ldLibraryPath)
      dmdLibrary = "dmd.dll"
      preloadEnvVar = "MOZ_REPLACE_MALLOC_LIB"

    if dmdPath and dmdLibrary and preloadEnvVar:
      env['DMD'] = '1'
      env[preloadEnvVar] = os.path.join(dmdPath, dmdLibrary)

    if crashreporter and not debugger:
      env['MOZ_CRASHREPORTER_NO_REPORT'] = '1'
      env['MOZ_CRASHREPORTER'] = '1'
    else:
      env['MOZ_CRASHREPORTER_DISABLE'] = '1'

    # Crash on non-local network connections by default.
    # MOZ_DISABLE_NONLOCAL_CONNECTIONS can be set to "0" to temporarily
    # enable non-local connections for the purposes of local testing.  Don't
    # override the user's choice here.  See bug 1049688.
    env.setdefault('MOZ_DISABLE_NONLOCAL_CONNECTIONS', '1')

    env['GNOME_DISABLE_CRASH_DIALOG'] = '1'
    env['XRE_NO_WINDOWS_CRASH_DIALOG'] = '1'
    env['NS_TRACE_MALLOC_DISABLE_STACKS'] = '1'

    # Set WebRTC logging in case it is not set yet
    env.setdefault('NSPR_LOG_MODULES', 'signaling:5,mtransport:5,datachannel:5')
    env.setdefault('R_LOG_LEVEL', '6')
    env.setdefault('R_LOG_DESTINATION', 'stderr')
    env.setdefault('R_LOG_VERBOSE', '1')

    # ASan specific environment stuff
    if self.IS_ASAN and (self.IS_LINUX or self.IS_MAC):
      # Symbolizer support
      llvmsym = os.path.join(xrePath, "llvm-symbolizer")
      if os.path.isfile(llvmsym):
        env["ASAN_SYMBOLIZER_PATH"] = llvmsym
        self.log.info("INFO | automation.py | ASan using symbolizer at %s", llvmsym)
      else:
        self.log.info("TEST-UNEXPECTED-FAIL | automation.py | Failed to find ASan symbolizer at %s", llvmsym)

      try:
        totalMemory = int(os.popen("free").readlines()[1].split()[1])

        # Only 4 GB RAM or less available? Use custom ASan options to reduce
        # the amount of resources required to do the tests. Standard options 
        # will otherwise lead to OOM conditions on the current test slaves.
        if totalMemory <= 1024 * 1024 * 4:
          self.log.info("INFO | automation.py | ASan running in low-memory configuration")
          env["ASAN_OPTIONS"] = "quarantine_size=50331648:malloc_context_size=5"
        else:
          self.log.info("INFO | automation.py | ASan running in default memory configuration")
      except OSError,err:
        self.log.info("Failed determine available memory, disabling ASan low-memory configuration: %s", err.strerror)
      except:
        self.log.info("Failed determine available memory, disabling ASan low-memory configuration")

    return env

  def killPid(self, pid):
    try:
      os.kill(pid, getattr(signal, "SIGKILL", signal.SIGTERM))
    except WindowsError:
      self.log.info("Failed to kill process %d." % pid)

  if IS_WIN32:
    PeekNamedPipe = ctypes.windll.kernel32.PeekNamedPipe
    GetLastError = ctypes.windll.kernel32.GetLastError

    def readWithTimeout(self, f, timeout):
      """
      Try to read a line of output from the file object |f|. |f| must be a
      pipe, like the |stdout| member of a subprocess.Popen object created
      with stdout=PIPE. Returns a tuple (line, did_timeout), where |did_timeout|
      is True if the read timed out, and False otherwise. If no output is
      received within |timeout| seconds, returns a blank line.
      """

      if timeout is None:
        timeout = 0

      x = msvcrt.get_osfhandle(f.fileno())
      l = ctypes.c_long()
      done = time.time() + timeout

      buffer = ""
      while timeout == 0 or time.time() < done:
        if self.PeekNamedPipe(x, None, 0, None, ctypes.byref(l), None) == 0:
          err = self.GetLastError()
          if err == 38 or err == 109: # ERROR_HANDLE_EOF || ERROR_BROKEN_PIPE
            return ('', False)
          else:
            self.log.error("readWithTimeout got error: %d", err)
        # read a character at a time, checking for eol. Return once we get there.
        index = 0
        while index < l.value:
          char = f.read(1)
          buffer += char
          if char == '\n':
            return (buffer, False)
          index = index + 1
        time.sleep(0.01)
      return (buffer, True)

    def isPidAlive(self, pid):
      STILL_ACTIVE = 259
      PROCESS_QUERY_LIMITED_INFORMATION = 0x1000
      pHandle = ctypes.windll.kernel32.OpenProcess(PROCESS_QUERY_LIMITED_INFORMATION, 0, pid)
      if not pHandle:
        return False
      pExitCode = ctypes.wintypes.DWORD()
      ctypes.windll.kernel32.GetExitCodeProcess(pHandle, ctypes.byref(pExitCode))
      ctypes.windll.kernel32.CloseHandle(pHandle)
      return pExitCode.value == STILL_ACTIVE

  else:

    def readWithTimeout(self, f, timeout):
      """Try to read a line of output from the file object |f|. If no output
      is received within |timeout| seconds, return a blank line.
      Returns a tuple (line, did_timeout), where |did_timeout| is True
      if the read timed out, and False otherwise."""
      (r, w, e) = select.select([f], [], [], timeout)
      if len(r) == 0:
        return ('', True)
      return (f.readline(), False)

    def isPidAlive(self, pid):
      try:
        # kill(pid, 0) checks for a valid PID without actually sending a signal
        # The method throws OSError if the PID is invalid, which we catch below.
        os.kill(pid, 0)

        # Wait on it to see if it's a zombie. This can throw OSError.ECHILD if
        # the process terminates before we get to this point.
        wpid, wstatus = os.waitpid(pid, os.WNOHANG)
        return wpid == 0
      except OSError, err:
        # Catch the errors we might expect from os.kill/os.waitpid, 
        # and re-raise any others
        if err.errno == errno.ESRCH or err.errno == errno.ECHILD:
          return False
        raise

  def dumpScreen(self, utilityPath):
    if self.haveDumpedScreen:
      self.log.info("Not taking screenshot here: see the one that was previously logged")
      return

    self.haveDumpedScreen = True;
    automationutils.dumpScreen(utilityPath)


  def killAndGetStack(self, processPID, utilityPath, debuggerInfo):
    """Kill the process, preferrably in a way that gets us a stack trace.
       Also attempts to obtain a screenshot before killing the process."""
    if not debuggerInfo:
      self.dumpScreen(utilityPath)
    self.killAndGetStackNoScreenshot(processPID, utilityPath, debuggerInfo)

  def killAndGetStackNoScreenshot(self, processPID, utilityPath, debuggerInfo):
    """Kill the process, preferrably in a way that gets us a stack trace."""
    if self.CRASHREPORTER and not debuggerInfo:
      if not self.IS_WIN32:
        # ABRT will get picked up by Breakpad's signal handler
        os.kill(processPID, signal.SIGABRT)
        return
      else:
        # We should have a "crashinject" program in our utility path
        crashinject = os.path.normpath(os.path.join(utilityPath, "crashinject.exe"))
        if os.path.exists(crashinject):
          status = subprocess.Popen([crashinject, str(processPID)]).wait()
          automationutils.printstatus(status, "crashinject")
          if status == 0:
            return
    self.log.info("Can't trigger Breakpad, just killing process")
    self.killPid(processPID)

  def waitForFinish(self, proc, utilityPath, timeout, maxTime, startTime, debuggerInfo, symbolsPath):
    """ Look for timeout or crashes and return the status after the process terminates """
    stackFixerFunction = None
    didTimeout = False
    hitMaxTime = False
    if proc.stdout is None:
      self.log.info("TEST-INFO: Not logging stdout or stderr due to debugger connection")
    else:
      logsource = proc.stdout

      if self.IS_DEBUG_BUILD and symbolsPath and os.path.exists(symbolsPath):
        # Run each line through a function in fix_stack_using_bpsyms.py (uses breakpad symbol files)
        # This method is preferred for Tinderbox builds, since native symbols may have been stripped.
        sys.path.insert(0, utilityPath)
        import fix_stack_using_bpsyms as stackFixerModule
        stackFixerFunction = lambda line: stackFixerModule.fixSymbols(line, symbolsPath)
        del sys.path[0]
      elif self.IS_DEBUG_BUILD and self.IS_MAC:
        # Run each line through a function in fix_macosx_stack.py (uses atos)
        sys.path.insert(0, utilityPath)
        import fix_macosx_stack as stackFixerModule
        stackFixerFunction = lambda line: stackFixerModule.fixSymbols(line)
        del sys.path[0]
      elif self.IS_DEBUG_BUILD and self.IS_LINUX:
        # Run each line through a function in fix_linux_stack.py (uses addr2line)
        # This method is preferred for developer machines, so we don't have to run "make buildsymbols".
        sys.path.insert(0, utilityPath)
        import fix_linux_stack as stackFixerModule
        stackFixerFunction = lambda line: stackFixerModule.fixSymbols(line)
        del sys.path[0]

      # With metro browser runs this script launches the metro test harness which launches the browser.
      # The metro test harness hands back the real browser process id via log output which we need to
      # pick up on and parse out. This variable tracks the real browser process id if we find it.
      browserProcessId = -1

      (line, didTimeout) = self.readWithTimeout(logsource, timeout)
      while line != "" and not didTimeout:
        if stackFixerFunction:
          line = stackFixerFunction(line)
        self.log.info(line.rstrip().decode("UTF-8", "ignore"))
        if "TEST-START" in line and "|" in line:
          self.lastTestSeen = line.split("|")[1].strip()
        if not debuggerInfo and "TEST-UNEXPECTED-FAIL" in line and "Test timed out" in line:
          self.dumpScreen(utilityPath)

        (line, didTimeout) = self.readWithTimeout(logsource, timeout)

        if "METRO_BROWSER_PROCESS" in line:
          index = line.find("=")
          if index:
            browserProcessId = line[index+1:].rstrip()
            self.log.info("INFO | automation.py | metro browser sub process id detected: %s", browserProcessId)

        if not hitMaxTime and maxTime and datetime.now() - startTime > timedelta(seconds = maxTime):
          # Kill the application.
          hitMaxTime = True
          self.log.info("TEST-UNEXPECTED-FAIL | %s | application ran for longer than allowed maximum time of %d seconds", self.lastTestSeen, int(maxTime))
          self.killAndGetStack(proc.pid, utilityPath, debuggerInfo)
      if didTimeout:
        if line:
          self.log.info(line.rstrip().decode("UTF-8", "ignore"))
        self.log.info("TEST-UNEXPECTED-FAIL | %s | application timed out after %d seconds with no output", self.lastTestSeen, int(timeout))
        if browserProcessId == -1:
          browserProcessId = proc.pid
        self.killAndGetStack(browserProcessId, utilityPath, debuggerInfo)

    status = proc.wait()
    automationutils.printstatus(status, "Main app process")
    if status == 0:
      self.lastTestSeen = "Main app process exited normally"
    if status != 0 and not didTimeout and not hitMaxTime:
      self.log.info("TEST-UNEXPECTED-FAIL | %s | Exited with code %d during test run", self.lastTestSeen, status)
    return status

  def buildCommandLine(self, app, debuggerInfo, profileDir, testURL, extraArgs):
    """ build the application command line """

    cmd = os.path.abspath(app)
    if self.IS_MAC and os.path.exists(cmd + "-bin"):
      # Prefer 'app-bin' in case 'app' is a shell script.
      # We can remove this hack once bug 673899 etc are fixed.
      cmd += "-bin"

    args = []

    if debuggerInfo:
      args.extend(debuggerInfo.args)
      args.append(cmd)
      cmd = os.path.abspath(debuggerInfo.path)

    if self.IS_MAC:
      args.append("-foreground")

    if self.IS_CYGWIN:
      profileDirectory = commands.getoutput("cygpath -w \"" + profileDir + "/\"")
    else:
      profileDirectory = profileDir + "/"

    args.extend(("-no-remote", "-profile", profileDirectory))
    if testURL is not None:
      args.append((testURL))
    args.extend(extraArgs)
    return cmd, args

  def checkForZombies(self, processLog, utilityPath, debuggerInfo):
    """ Look for hung processes """
    if not os.path.exists(processLog):
      self.log.info('Automation Error: PID log not found: %s', processLog)
      # Whilst no hung process was found, the run should still display as a failure
      return True

    foundZombie = False
    self.log.info('INFO | zombiecheck | Reading PID log: %s', processLog)
    processList = []
    pidRE = re.compile(r'launched child process (\d+)$')
    processLogFD = open(processLog)
    for line in processLogFD:
      self.log.info(line.rstrip())
      m = pidRE.search(line)
      if m:
        processList.append(int(m.group(1)))
    processLogFD.close()

    for processPID in processList:
      self.log.info("INFO | zombiecheck | Checking for orphan process with PID: %d", processPID)
      if self.isPidAlive(processPID):
        foundZombie = True
        self.log.info("TEST-UNEXPECTED-FAIL | zombiecheck | child process %d still alive after shutdown", processPID)
        self.killAndGetStack(processPID, utilityPath, debuggerInfo)
    return foundZombie

  def checkForCrashes(self, minidumpDir, symbolsPath):
    return mozcrash.check_for_crashes(minidumpDir, symbolsPath, test_name=self.lastTestSeen)

  def runApp(self, testURL, env, app, profileDir, extraArgs,
             runSSLTunnel = False, utilityPath = None,
             xrePath = None, certPath = None,
             debuggerInfo = None, symbolsPath = None,
             timeout = -1, maxTime = None, onLaunch = None,
             detectShutdownLeaks = False, screenshotOnFail=False, testPath=None, bisectChunk=None):
    """
    Run the app, log the duration it took to execute, return the status code.
    Kills the app if it runs for longer than |maxTime| seconds, or outputs nothing for |timeout| seconds.
    """

    if utilityPath == None:
      utilityPath = self.DIST_BIN
    if xrePath == None:
      xrePath = self.DIST_BIN
    if certPath == None:
      certPath = self.CERTS_SRC_DIR
    if timeout == -1:
      timeout = self.DEFAULT_TIMEOUT

    # copy env so we don't munge the caller's environment
    env = dict(env);
    env["NO_EM_RESTART"] = "1"
    tmpfd, processLog = tempfile.mkstemp(suffix='pidlog')
    os.close(tmpfd)
    env["MOZ_PROCESS_LOG"] = processLog

    if self.IS_TEST_BUILD and runSSLTunnel:
      # create certificate database for the profile
      certificateStatus = self.fillCertificateDB(profileDir, certPath, utilityPath, xrePath)
      if certificateStatus != 0:
        self.log.info("TEST-UNEXPECTED-FAIL | automation.py | Certificate integration failed")
        return certificateStatus

      # start ssltunnel to provide https:// URLs capability
      ssltunnel = os.path.join(utilityPath, "ssltunnel" + self.BIN_SUFFIX)
      ssltunnelProcess = self.Process([ssltunnel, 
                               os.path.join(profileDir, "ssltunnel.cfg")], 
                               env = self.environment(xrePath = xrePath))
      self.log.info("INFO | automation.py | SSL tunnel pid: %d", ssltunnelProcess.pid)

    cmd, args = self.buildCommandLine(app, debuggerInfo, profileDir, testURL, extraArgs)
    startTime = datetime.now()

    if debuggerInfo and debuggerInfo.interactive:
      # If an interactive debugger is attached, don't redirect output,
      # don't use timeouts, and don't capture ctrl-c.
      timeout = None
      maxTime = None
      outputPipe = None
      signal.signal(signal.SIGINT, lambda sigid, frame: None)
    else:
      outputPipe = subprocess.PIPE

    self.lastTestSeen = "automation.py"
    proc = self.Process([cmd] + args,
                 env = self.environment(env, xrePath = xrePath,
                                   crashreporter = not debuggerInfo),
                 stdout = outputPipe,
                 stderr = subprocess.STDOUT)
    self.log.info("INFO | automation.py | Application pid: %d", proc.pid)

    if onLaunch is not None:
      # Allow callers to specify an onLaunch callback to be fired after the
      # app is launched.
      onLaunch()

    status = self.waitForFinish(proc, utilityPath, timeout, maxTime, startTime, debuggerInfo, symbolsPath)
    self.log.info("INFO | automation.py | Application ran for: %s", str(datetime.now() - startTime))

    # Do a final check for zombie child processes.
    zombieProcesses = self.checkForZombies(processLog, utilityPath, debuggerInfo)

    crashed = self.checkForCrashes(os.path.join(profileDir, "minidumps"), symbolsPath)

    if crashed or zombieProcesses:
      status = 1

    if os.path.exists(processLog):
      os.unlink(processLog)

    if self.IS_TEST_BUILD and runSSLTunnel:
      ssltunnelProcess.kill()

    return status

  def getExtensionIDFromRDF(self, rdfSource):
    """
    Retrieves the extension id from an install.rdf file (or string).
    """
    from xml.dom.minidom import parse, parseString, Node

    if isinstance(rdfSource, file):
      document = parse(rdfSource)
    else:
      document = parseString(rdfSource)

    # Find the <em:id> element. There can be multiple <em:id> tags
    # within <em:targetApplication> tags, so we have to check this way.
    for rdfChild in document.documentElement.childNodes:
      if rdfChild.nodeType == Node.ELEMENT_NODE and rdfChild.tagName == "Description":
        for descChild in rdfChild.childNodes:
          if descChild.nodeType == Node.ELEMENT_NODE and descChild.tagName == "em:id":
            return descChild.childNodes[0].data

    return None

  def installExtension(self, extensionSource, profileDir, extensionID = None):
    """
    Copies an extension into the extensions directory of the given profile.
    extensionSource - the source location of the extension files.  This can be either
                      a directory or a path to an xpi file.
    profileDir      - the profile directory we are copying into.  We will create the
                      "extensions" directory there if it doesn't exist.
    extensionID     - the id of the extension to be used as the containing directory for the
                      extension, if extensionSource is a directory, i.e.
                  this is the name of the folder in the <profileDir>/extensions/<extensionID>
    """
    if not os.path.isdir(profileDir):
      self.log.info("INFO | automation.py | Cannot install extension, invalid profileDir at: %s", profileDir)
      return

    installRDFFilename = "install.rdf"

    extensionsRootDir = os.path.join(profileDir, "extensions", "staged")
    if not os.path.isdir(extensionsRootDir):
      os.makedirs(extensionsRootDir)

    if os.path.isfile(extensionSource):
      reader = automationutils.ZipFileReader(extensionSource)

      for filename in reader.namelist():
        # Sanity check the zip file.
        if os.path.isabs(filename):
          self.log.info("INFO | automation.py | Cannot install extension, bad files in xpi")
          return

        # We may need to dig the extensionID out of the zip file...
        if extensionID is None and filename == installRDFFilename:
          extensionID = self.getExtensionIDFromRDF(reader.read(filename))

      # We must know the extensionID now.
      if extensionID is None:
        self.log.info("INFO | automation.py | Cannot install extension, missing extensionID")
        return

      # Make the extension directory.
      extensionDir = os.path.join(extensionsRootDir, extensionID)
      os.mkdir(extensionDir)

      # Extract all files.
      reader.extractall(extensionDir)

    elif os.path.isdir(extensionSource):
      if extensionID is None:
        filename = os.path.join(extensionSource, installRDFFilename)
        if os.path.isfile(filename):
          with open(filename, "r") as installRDF:
            extensionID = self.getExtensionIDFromRDF(installRDF)

        if extensionID is None:
          self.log.info("INFO | automation.py | Cannot install extension, missing extensionID")
          return

      # Copy extension tree into its own directory.
      # "destination directory must not already exist".
      shutil.copytree(extensionSource, os.path.join(extensionsRootDir, extensionID))

    else:
      self.log.info("INFO | automation.py | Cannot install extension, invalid extensionSource at: %s", extensionSource)

  def elf_arm(self, filename):
    data = open(filename, 'rb').read(20)
    return data[:4] == "\x7fELF" and ord(data[18]) == 40 # EM_ARM

