[Chromoting] Keystone installer package.

remoting/host/installer/mac/Keystone/GoogleSoftwareUpdate.pkg/Contents/Resources/install.py

+#!/usr/bin/python
+# Copyright 2008 Google Inc.  All rights reserved.
+
+"""This script will install Keystone in the correct context
+(system-wide or per-user).  It can also uninstall Keystone.  is run by
+KeystoneRegistration.framework.
+
+Example command lines for testing:
+Install:    install.py --install=/tmp/Keystone.tbz --root=/Users/fred
+Uninstall:  install.py --nuke --root=/Users/fred
+
+Example real command lines, for user and root install and uninstall:
+  install.py --install Keystone.tbz
+  install.py --nuke
+  sudo install.py --install Keystone.tbz
+  sudo install.py --nuke
+
+For a system-wide Keystone, the install root is "/".  Run with --help
+for a list of options.  Use --no-launchdjobs to NOT start background
+processes.
+
+Errors can happen if:
+ - we don't have write permission to install in the given root
+ - pieces of our install are missing
+
+On error, we print an message on stdout and our exit status is
+non-zero.  On success, we print nothing and exit with a status of 0.
+"""
+
+import os
+import re
+import sys
+import pwd
+import stat
+import glob
+import getopt
+import shutil
+import platform
+import fcntl
+
+
+# Allow us to force the installer to think we're on Tiger (10.4)
+FORCE_TIGER = False
+
+# Allow us to adjust the agent launch interval (for testing).
+# In seconds.  Time is 1 hour minus a jitter factor.
+AGENT_START_INTERVAL = 3523
+
+# Name of our "lockdown" ticket.  If you change this name be sure to
+# change it in other places in the code (grep is your friend)
+LOCKDOWN_TICKET = 'com.google.Keystone.Lockdown'
+
+# Process that we consider a marker of a running user login session
+USER_SESSION_PROCESSNAME = \
+    ' /System/Library/CoreServices/Finder.app/Contents/MacOS/Finder'
+
+
+class Error(Exception):
+  """Generic exception for Keystone install failure."""
+
+  def __init__(self, package, root, msg):
+    self.package = package
+    self.root = root
+    self.msg = msg
+
+  def __str__(self):
+    return 'Package: %s, Root: %s, Error: %s' % (self.package, self.root,
+                                                 self.msg)
+
+
+def CheckOnePath(file, statmode):
+  """Sanity check a file or directory as requested.  On failure throw
+  an exception."""
+  if os.path.exists(file):
+    st = os.stat(file)
+    if (st.st_mode & statmode) != 0:
+      return
+  raise Error('None', 'None', 'Path check failure for "%s" mode %s' %
+              (file, statmode))
+
+
+# -------------------------------------------------------------------------
+
+class KeystoneInstall(object):
+  """Worker object which does the heavy lifting of install or uninstall.
+  By default it assumes 10.5 (Leopard).
+
+  Args:
+    package: The package to install (i.e. Keystone.tbz)
+    is_system: True if this is a system Keystone install
+    agent_job_uid: uid to start agent jobs as or None to use current euid
+    root: root directory for install.  On System this would be "/";
+          else would be a user home directory (unless testing, in which case
+          the root can be anywhere).
+    launchd_setup: True if the installation should setup launchd job description
+                   plists (and Tiger equivalents)
+    launchd_jobs: True if the installation should start/stop related jobs
+    self_destruct: True if uninstall is being triggered by a process the
+                   uninstall is expected to kill
+
+  Conventions:
+    All functions which return directory paths end in '/'
+  """
+
+  def __init__(self, package, is_system, agent_job_uid, root,
+               launchd_setup, launchd_jobs, self_destruct):
+    self.package = package
+    self.is_system = is_system
+    self.agent_job_uid = agent_job_uid
+    if is_system:
+      assert agent_job_uid is not None, 'System install needs agent job uid'
+    self.root = root
+    if not self.root.endswith('/'):
+      self.root = self.root + '/'
+    self.launchd_setup = launchd_setup
+    self.launchd_jobs = launchd_jobs
+    self.self_destruct = self_destruct
+    self.cached_package_version = None
+    # Save/restore permissions
+    self.old_euid = None
+    self.old_egid = None
+    self.old_umask = None
+
+  def RunCommand(self, cmd):
+    """Runs a command, returning return code and output.
+
+    Returns:
+      Tuple of return value, stdout and stderr.
+    """
+    # We need to work in python 2.3 (OSX 10.4), 2.5 (10.5), and 2.6 (10.6)
+    if (sys.version_info[0] == 2) and (sys.version_info[1] <= 5):
+      # subprocess.communicate implemented the hard way
+      import errno
+      import popen2
+      import select
+      p = popen2.Popen3(cmd, True)
+      stdout = []
+      stderr = []
+      readable = [ p.fromchild, p.childerr ]
+      while not p.fromchild.closed or not p.childerr.closed:
+        try:
+          try_to_read = []
+          if not p.fromchild.closed:
+            try_to_read.append(p.fromchild)
+          if not p.childerr.closed:
+            try_to_read.append(p.childerr)
+          readable, ignored_w, ignored_x = select.select(try_to_read, [], [])
+        except select.error, e:
+          if e.args[0] == errno.EINTR:
+            continue
+          raise
+        if p.fromchild in readable:
+          out = os.read(p.fromchild.fileno(), 1024)
+          stdout.append(out)
+          if out == '':
+            p.fromchild.close()
+        if p.childerr in readable:
+          errout = os.read(p.childerr.fileno(), 1024)
+          stderr.append(errout)
+          if errout == '':
+            p.childerr.close()
+      result = p.wait()
+      return (os.WEXITSTATUS(result), ''.join(stdout), ''.join(stderr))
+    else:
+      # Just use subprocess, so much simpler
+      import subprocess
+      p = subprocess.Popen(cmd, shell=False, stdout=subprocess.PIPE,
+                           stderr=subprocess.PIPE, close_fds=True)
+      (stdout, stderr) = p.communicate()
+      return (p.returncode, stdout, stderr)
+
+  def _AgentProcessName(self):
+    """Return the process name of the agent."""
+    return 'GoogleSoftwareUpdateAgent'
+
+  def _LibraryCachesDirPath(self):
+    """Return the Library/Caches subdirectory"""
+    return os.path.join(self.root, 'Library/Caches/')
+
+  def _LibraryGoogleDirPath(self):
+    """Return the Library subdirectory that parents all our dirs"""
+    return os.path.join(self.root, 'Library/Google/')
+
+  def _KeystoneDirPath(self):
+    """Return the subdirectory where Keystone.bundle is or will be.
+    Does not sanity check the directory."""
+    return os.path.join(self._LibraryGoogleDirPath(), 'GoogleSoftwareUpdate/')
+
+  def _KeystoneBundlePath(self):
+    """Return the location of Keystone.bundle."""
+    return os.path.join(self._KeystoneDirPath(), 'GoogleSoftwareUpdate.bundle/')
+
+  def _KeystoneTicketStorePath(self):
+    """Returns directory path of the Keystone ticket store."""
+    return os.path.join(self._KeystoneDirPath(), 'TicketStore')
+
+  def _KsadminPath(self):
+    """Return a path to ksadmin which will exist only AFTER Keystone is
+    installed.  Return None if it doesn't exist."""
+    ksadmin = os.path.join(self._KeystoneBundlePath(), 'Contents/MacOS/ksadmin')
+    if not os.path.exists(ksadmin):
+      return None
+    return ksadmin
+
+  def _KeystoneResourcePath(self):
+    """Return the subdirectory where Keystone.bundle's resources should be."""
+    return os.path.join(self._KeystoneBundlePath(), 'Contents/Resources/')
+
+  def _KeystoneAgentPath(self):
+    """Returns a path to installed KeystoneAgent.app."""
+    return os.path.join(self._KeystoneResourcePath(),
+                        'GoogleSoftwareUpdateAgent.app/')
+
+  def _LaunchAgentConfigDir(self):
+    """Return the destination directory where launch agents should go."""
+    return os.path.join(self.root, 'Library/LaunchAgents/')
+
+  def _LaunchDaemonConfigDir(self):
+    """Return the destination directory where launch daemons should go."""
+    return os.path.join(self.root, 'Library/LaunchDaemons/')
+
+  def _KeystoneTicketURL(self):
+    """Return the URL for Keystone's ticket, possibly from a defaults file."""
+    # Rather than spam the console for this a lot when missing, existence
+    # check first.
+    cmd = ['/usr/bin/defaults', 'domains' ]
+    (result, out, errout) = self.RunCommand(cmd)
+    # Rough check only
+    if out.find('com.google.KeystoneInstall') != -1:
+      cmd = ['/usr/bin/defaults', 'read', 'com.google.KeystoneInstall', 'URL']
+      (result, out, errout) = self.RunCommand(cmd)
+      url = out.strip()
+      if result == 0 and len(url) > 0:
+        return url
+    return 'https://tools.google.com/service/update2'
+
+  def _AgentPlistFileName(self):
+    """Return the filename of the Keystone agent launchd plist or None."""
+    return 'com.google.keystone.agent.plist'
+
+  def _DaemonPlistFileName(self):
+    """Return the filename of the Keystone daemon launchd plist."""
+    return 'com.google.keystone.daemon.plist'
+
+  def InstalledKeystoneBundleVersion(self):
+    """Return the version of an installed Keystone bundle, or None if
+    not installed.  Specifically, it returns the CFBundleVersion as a
+    string (e.g. "0.1.0.0").
+
+    Invariant: we require a 4-digit version when building Keystone.bundle.
+    """
+    defaults_domain = os.path.join(self._KeystoneBundlePath(), 'Contents/Info')
+    if not os.path.exists(defaults_domain + '.plist'):
+      return None
+    cmd = ['/usr/bin/defaults', 'read', defaults_domain, 'CFBundleVersion']
+    (result, out, errout) = self.RunCommand(cmd)
+    if result != 0:
+      raise Error(self.package, self.root,
+                  'Unable to read installed CFBundleVersion: "%s"' % errout)
+    return out.strip()
+
+  def MyKeystoneBundleVersion(self):
+    """Return the version of our Keystone bundle which we might want to install.
+    Specifically, it returns the CFBundleVersion as a string (e.g. "0.1.0.0").
+
+    Invariant: we require a 4-digit version when building Keystone.bundle.
+    """
+    if self.cached_package_version is None:
+      cmd = ['/usr/bin/tar', '-Oxjf',
+             self.package,
+             'GoogleSoftwareUpdate.bundle/Contents/Info.plist']
+      (result, out, errout) = self.RunCommand(cmd)
+      if result != 0:
+        raise Error(self.package, self.root,
+                    'Unable to read package Info.plist: "%s"' % errout)
+      # walking by index instead of implicit iterator so we can easily
+      # "get next"
+      linelist = out.splitlines()
+      for i in range(len(linelist)):
+        if linelist[i].find('<key>CFBundleVersion</key>') != -1:
+          version = linelist[i+1].strip()
+          version = version.strip('<string>').strip('</string>')
+          self.cached_package_version = version
+          break
+    return self.cached_package_version
+
+  def IsVersionGreaterThanVersion(self, a_version, b_version):
+    """Return True if a_version is greater than b_version.
+
+    Invariant: we require a 4-digit version when building Keystone.bundle.
+    """
+    if a_version is None or b_version is None:
+      return True
+    else:
+      a_version = a_version.split('.')
+      b_version = b_version.split('.')
+    # Only correct for 4-digit versions, see invariants.
+    if len(a_version) != len(b_version):
+      return True
+    for a, b in zip(a_version, b_version):
+      if int(a) > int(b):
+        return True
+      elif int(a) < int(b):
+        return False
+    # If we get here, it's a complete match, so no.
+    return False
+
+  def IsMyVersionGreaterThanInstalledVersion(self):
+    """Returns True if package Keystone version is greater than current install.
+
+    Invariant: we require a 4-digit version when building Keystone.bundle.
+    """
+    my_version = self.MyKeystoneBundleVersion()
+    installed_version = self.InstalledKeystoneBundleVersion()
+    return self.IsVersionGreaterThanVersion(my_version, installed_version)
+
+  def _SetSystemInstallPermissions(self):
+    """Set permissions for system install, must pair with
+    _ClearSystemInstallPermissions(). Call before any filesystem access."""
+    assert (self.old_euid is None and self.old_egid is None and
+            self.old_umask is None), 'System permissions used reentrant'
+    self.old_euid = os.geteuid()
+    os.seteuid(0)
+    self.old_egid = os.getegid()
+    os.setegid(0)
+    self.old_umask = os.umask(022)
+
+  def _ClearSystemInstallPermissions(self):
+    """Restore prior permissions after _SetSystemInstallPermissions()."""
+    assert (self.old_euid is not None and self.old_egid is not None and
+            self.old_umask is not None), 'System permissions cleared before set'
+    os.seteuid(self.old_euid)
+    self.old_euid = None
+    os.setegid(self.old_egid)
+    self.old_egid = None
+    os.umask(self.old_umask)
+    self.old_umask = None
+
+  def _InstallPlist(self, plist, dest_dir):
+    """Install a copy of the plist from Resources to the dest_dir path.
+    For system install, assumes you have already called
+    _SetSystemInstallPermissions().
+    """
+    try:
+      pf = open(os.path.join(self._KeystoneResourcePath(), plist), 'r')
+      content = pf.read()
+      pf.close()
+    except IOError, e:
+      raise Error(self.package, self.root,
+                  'Failed to read resource launchd plist "%s": %s' %
+                  (plist, str(e)))
+    # This line is key.  We can't have a tilde in a launchd script;
+    # we need an absolute path.  So we replace a known token, like this:
+    #    cat src.plist | 's/INSTALL_ROOT/self.root/g' > dest.plist
+    content = content.replace('${INSTALL_ROOT}', self.root)
+    content = content.replace(self.root + '/', self.root)  # doubleslash remove
+    # Make sure launchd can distinguish between user and system Agents.
+    # This is a no-op for the daemon.
+    if self.is_system:
+      content = content.replace('${INSTALL_TYPE}', 'root')
+    else:
+      content = content.replace('${INSTALL_TYPE}', 'user')
+    # Allow start interval to be configured.
+    content = content.replace('${START_INTERVAL}', str(AGENT_START_INTERVAL))
+    try:
+      # Write to temp file then move in place (safe save)
+      target_file = os.path.join(dest_dir, plist)
+      target_tmp_file = target_file + '.tmp'
+      pf = open(target_tmp_file, 'w')
+      pf.write(content)
+      pf.close()
+      os.rename(target_tmp_file, target_file)
+    except IOError, e:
+      raise Error(self.package, self.root,
+                  'Failed to install launchd plist "%s": %s' %
+                  (os.path.join(dest_dir, plist), str(e)))
+
+  def _InstallAgentLoginItem(self):
+    """Setup the agent login item (vs. launchd job).
+    Assumes _SetSystemInstallPermissions() has been called."""
+    pass
+
+  def _RemoveAgentLoginItem(self):
+    """Remove the agent login item (vs. launchd job).
+    Assumes _SetSystemInstallPermissions() has been called.
+
+    Note: We use this code on both Tiger and Leopard to handle the OS upgrade
+    case.
+    """
+    if self.is_system:
+      domain = '/Library/Preferences/loginwindow'
+    else:
+      domain = 'loginwindow'
+    (result, alaout, errout) = self.RunCommand(['/usr/bin/defaults', 'read',
+        domain, 'AutoLaunchedApplicationDictionary'])
+    # Ignoring result
+    if len(alaout.strip()) == 0:
+      alaout = '()'
+    # One line per loginitem to help us match
+    alaout = re.compile('[\n]+').sub('', alaout)
+    # handles case where we are the only item
+    alaout = alaout.replace('(', '(\n')
+    alaout = alaout.replace('}', '}\n')
+    needed_removal = False
+    for line in alaout.splitlines():
+      if line.find('/Library/Google/GoogleSoftwareUpdate/'
+                   'GoogleSoftwareUpdate.bundle/Contents/'
+                   'Resources/GoogleSoftwareUpdateAgent.app') != -1:
+        alaout = alaout.replace(line, '')
+        needed_removal = True
+    alaout = alaout.replace('\n', '')
+    # make sure it's a well-formed list
+    alaout = alaout.replace('(,', '(')
+    if needed_removal:
+      (result, out, errout) = self.RunCommand(['/usr/bin/defaults', 'write',
+          domain, 'AutoLaunchedApplicationDictionary', alaout])
+      # Ignore result, if we messed up the parse just move on.
+
+  def _ChangeDaemonRunStatus(self, start, ignore_failure):
+    """Start or stop the daemon using launchd."""
+    assert self.is_system, 'Daemon start on non-system install'
+    self._SetSystemInstallPermissions()
+    try:
+      if start:
+        action = 'load'
+      else:
+        action = 'unload'
+      (result, out, errout) = self.RunCommand(['/bin/launchctl', action,
+          os.path.join(self._LaunchDaemonConfigDir(),
+                       self._DaemonPlistFileName())])
+      if not ignore_failure and result != 0:
+        raise Error(self.package, self.root, 'Failed to %s daemon (%d): %s' %
+                    (action, result, errout))
+    finally:
+      self._ClearSystemInstallPermissions()
+
+  def _ChangeAgentRunStatus(self, start, ignore_failure):
+    """Start or stop the agent using launchd."""
+    if self._AgentPlistFileName() is None:
+      return
+    if start:
+      action = 'load'
+      search_process_name = USER_SESSION_PROCESSNAME
+    else:
+      action = 'unload'
+      search_process_name = self._AgentProcessName()
+    if self.is_system:
+      self._SetSystemInstallPermissions()
+      try:
+        # System installation needs to use bsexec to hit all the running agents
+        (result, psout, pserr) = self.RunCommand(['/bin/ps', 'auxwww'])
+        if result != 0:  # Internal problem so don't use ignore_failure
+          raise Error(self.package, self.root,
+                      'Could not run /bin/ps: %s' % pserr)
+        for psline in psout.splitlines():
+          if psline.find(search_process_name) != -1:
+            username = psline.split()[0]
+            uid = pwd.getpwnam(username)[2]
+            # Must be root to bsexec.
+            # Must bsexec to (pid) to get in local user's context.
+            # Must become local user to have right process owner.
+            # Must unset SUDO_COMMAND to keep launchctl happy.
+            # Order is important.
+            agent_plist_path = os.path.join(self._LaunchAgentConfigDir(),
+                                            self._AgentPlistFileName())
+            (result, out, errout) = self.RunCommand([
+                '/bin/launchctl', 'bsexec', psline.split()[1],
+                '/usr/bin/sudo', '-u', username, '/bin/bash', '-c',
+                'unset SUDO_COMMAND ; /bin/launchctl %s -S Aqua "%s"' % (
+                    action,
+                    os.path.join(self._LaunchAgentConfigDir(),
+                                 self._AgentPlistFileName()))])
+            # Although we're running for every user, only treat the requested
+            # user as an error
+            if not ignore_failure and result != 0 and uid == self.agent_job_uid:
+              raise Error(self.package, self.root,
+                  'Failed to %s agent for uid %d from plist "%s" (%d): %s' %
+                  (action, self.agent_job_uid, agent_plist_path, result,
+                   errout))
+      finally:
+        self._ClearSystemInstallPermissions()
+    else:
+      # Non-system variant requires basic launchctl commands
+      agent_plist_path = os.path.join(self._LaunchAgentConfigDir(),
+                                      self._AgentPlistFileName())
+      (result, out, errout) = self.RunCommand(['/bin/launchctl', action,
+                                               '-S', 'Aqua', agent_plist_path])
+      if not ignore_failure and result != 0:
+        raise Error(self.package, self.root,
+                    'Failed to %s agent from plist "%s" (%d): %s' %
+                    (action, agent_plist_path, result, errout))
+
+  def _ClearQuarantine(self, path):
+    """Remove LaunchServices quarantine attributes from a file hierarchy."""
+    # /usr/bin/xattr* are implemented in Python, and there's much magic
+    # around which of /usr/bin/xattr and the multiple /usr/bin/xattr-2.?
+    # actually execute. I suspect at least some users have /usr/bin/python
+    # linked to a "real" copy or otherwise replaced, so we're going to
+    # try a bunch of different options.
+    # Implement it ourself
+    try:
+      import xattr
+      for (root, dirs, files) in os.walk(path):
+        for name in files:
+          attrs = xattr.xattr(os.path.join(path, name))
+          try:
+            del attrs['com.apple.quarantine']
+          except KeyError:
+            pass
+      return  # Success
+    except:
+      pass
+    # Use specific version by name in case /usr/bin/python isn't the Apple magic
+    # that selects the right copy of xattr. xattr-2.6 present on 10.6 and 10.7.
+    if os.path.exists('/usr/bin/xattr-2.6'):
+      (result, out, errout) = self.RunCommand(['/usr/bin/xattr-2.6', '-dr',
+                                               'com.apple.quarantine', path])
+      if result == 0:
+        return
+    # Fall back to /usr/bin/xattr. On Leopard it doesn't support '-r' so
+    # recurse using find. Ignore the result, this is our last attempt.
+    self.RunCommand(['/usr/bin/find', '-x', path, '-exec', '/usr/bin/xattr',
+                     '-d', 'com.apple.quarantine', '{}'])
+
+  def Install(self):
+    """Perform a complete install operation, including safe upgrade"""
+    # Unload any current processes but ignore failures
+    if self.launchd_setup and self.launchd_jobs:
+      self._ChangeAgentRunStatus(False, True)
+      if self.is_system:
+        self._ChangeDaemonRunStatus(False, True)
+    # Install new files
+    if self.is_system:
+      self._SetSystemInstallPermissions()
+    try:
+      # Make and protect base directories (always safe during upgrade)
+      if not os.path.isdir(self._KeystoneDirPath()):
+        os.makedirs(self._KeystoneDirPath())
+      if self.is_system:
+        os.chown(self._KeystoneDirPath(), 0, 0)
+        os.chmod(self._KeystoneDirPath(), 0755)
+        os.chown(self._LibraryGoogleDirPath(), 0, 0)
+        os.chmod(self._LibraryGoogleDirPath(), 0755)
+      # Unpack Keystone bundle. In an upgrade we want to try to restore
+      # to the old binary if install encounters a problem. Options flag names
+      # chosen to be compatible with both 10.4 and 10.6 (both BSD tar, but
+      # very different versions).
+      saved_bundle_path = self._KeystoneBundlePath().rstrip('/') + '.old'
+      if os.path.exists(self._KeystoneBundlePath()):
+        if os.path.isdir(saved_bundle_path):
+          shutil.rmtree(saved_bundle_path)
+        elif os.path.exists(saved_bundle_path):
+          os.unlink(saved_bundle_path)
+        os.rename(self._KeystoneBundlePath(), saved_bundle_path)
+      cmd = ['/usr/bin/tar', 'xjf', self.package, '--no-same-owner',
+             '-C', self._KeystoneDirPath()]
+      (result, out, errout) = self.RunCommand(cmd)
+      if result != 0:
+        try:
+          if os.path.exists(saved_bundle_path):
+            os.rename(saved_bundle_path, self._KeystoneBundlePath())
+        finally:
+          raise Error(self.package, self.root,
+                      'Unable to unpack package: "%s"' % errout)
+      if os.path.exists(saved_bundle_path):
+        shutil.rmtree(saved_bundle_path)
+      # Clear quarantine on the new bundle. Failure is ignored, user will
+      # be prompted if quarantine is not cleared, but we will still operate
+      # correctly.
+      self._ClearQuarantine(self._KeystoneBundlePath())
+      # Create Keystone ticket store. On a system install start by checking
+      # ticket store permissions. Bad permissions on the store could be the
+      # result of a prior install or an attempt to poison the store.
+      if self.is_system and os.path.exists(self._KeystoneTicketStorePath()):
+        s = os.lstat(self._KeystoneTicketStorePath())
+        if (s[stat.ST_UID] == 0 and
+            (s[stat.ST_GID] == 0 or s[stat.ST_GID] == 80)):
+          pass
+        else:
+          if os.path.isdir(self._KeystoneTicketStorePath()):
+            shutil.rmtree(self._KeystoneTicketStorePath())
+          else:
+            os.unlink(self._KeystoneTicketStorePath())
+      # Now create and protect ticket store
+      if not os.path.isdir(self._KeystoneTicketStorePath()):
+        os.makedirs(self._KeystoneTicketStorePath())
+      if self.is_system:
+        os.chown(self._KeystoneTicketStorePath(), 0, 0)
+        os.chmod(self._KeystoneTicketStorePath(), 0755)
+      # Create/update Keystone ticket
+      ksadmin_path = self._KsadminPath()
+      if not ksadmin_path or not os.path.exists(ksadmin_path):
+        raise Error(self.package, self.root, 'ksadmin not available')
+      cmd = [ksadmin_path,
+             # store is specified explicitly so unit tests work
+             '--store', os.path.join(self._KeystoneTicketStorePath(),
+                                     'Keystone.ticketstore'),
+             '--register',
+             '--productid', 'com.google.Keystone',
+             '--version', self.InstalledKeystoneBundleVersion(),
+             '--xcpath', ksadmin_path,
+             '--url', self._KeystoneTicketURL(),
+             '--preserve-tttoken']
+      (result, out, errout) = self.RunCommand(cmd)
+      if result != 0:
+        raise Error(self.package, self.root,
+            'Keystone ticket install failed (%d): %s' % (result, errout))
+      # launchd config if requested
+      if self.launchd_setup:
+        # Daemon first (safer if upgrade fails)
+        if self.is_system:
+          if not os.path.isdir(self._LaunchDaemonConfigDir()):
+            os.makedirs(self._LaunchDaemonConfigDir())
+            # Again set permissions only if we created it, but if we did use
+            # standard permission from a default OS install.
+            os.chown(self._LaunchDaemonConfigDir(), 0, 0)
+            os.chmod(self._LaunchDaemonConfigDir(), 0755)
+          self._InstallPlist(self._DaemonPlistFileName(),
+                                     self._LaunchDaemonConfigDir())
+        # Agent launchd
+        if self._AgentPlistFileName() is not None:
+          if not os.path.isdir(self._LaunchAgentConfigDir()):
+            os.makedirs(self._LaunchAgentConfigDir())
+            # /Library/LaunchAgents is a OS directory, use permissions from
+            # default OS install, but only if we created it.
+            if self.is_system:
+              os.chown(self._LaunchAgentConfigDir(), 0, 0)
+              os.chmod(self._LaunchAgentConfigDir(), 0755)
+          self._InstallPlist(self._AgentPlistFileName(),
+                                     self._LaunchAgentConfigDir())
+        # Agent login item remove/restore. Removal prior to add
+        # so that removal happens in Tiger -> Leopard upgrade case and
+        # we do not duplicate entries.
+        self._RemoveAgentLoginItem()
+        self._InstallAgentLoginItem()
+    finally:
+      if self.is_system:
+        self._ClearSystemInstallPermissions()
+    # If requested, start our jobs, failures treated as errors.
+    if self.launchd_setup and self.launchd_jobs:
+      if self.is_system:
+        self._ChangeDaemonRunStatus(True, False)
+      self._ChangeAgentRunStatus(True, False)
+
+  def LockdownKeystone(self):
+    """Prevent Keystone from ever self-uninstalling.
+
+    This is necessary for a System Keystone used for Trusted Tester support.
+    We do this by installing (and never uninstalling) a system ticket.
+    """
+    if self.is_system:
+      self._SetSystemInstallPermissions()
+    try:
+      ksadmin_path = self._KsadminPath()
+      if not ksadmin_path:
+        raise Error(self.package, self.root, 'ksadmin not available')
+      cmd = [ksadmin_path,
+             # store is specified explicitly so unit tests work
+             '--store', os.path.join(self._KeystoneTicketStorePath(),
+                                     'Keystone.ticketstore'),
+             '--register',
+             '--productid', LOCKDOWN_TICKET,
+             '--version', '1.0',
+             '--xcpath', '/',
+             '--url', self._KeystoneTicketURL()]
+      (result, out, errout) = self.RunCommand(cmd)
+      if result != 0:
+        raise Error(self.package, self.root,
+            'Keystone ticket install failed (%d): %s' % (result, errout))
+    finally:
+      if self.is_system:
+        self._ClearSystemInstallPermissions()
+
+  def Uninstall(self):
+    """Perform a complete uninstall (uninstall leaves tickets in place)"""
+    # On uninstall if we are not in self-destruct stop all processes but
+    # ignore failure (may not be running). On a non-self destruct case we do
+    # this first since it avoids race conditions on caches and pref writes
+    if not self.self_destruct and self.launchd_setup and self.launchd_jobs:
+      self._ChangeAgentRunStatus(False, True)
+      if self.is_system:
+        self._ChangeDaemonRunStatus(False, True)
+    # Perform file removals. In self-destruct case the processes may still
+    # be running.
+    if self.is_system:
+      self._SetSystemInstallPermissions()
+    try:
+      # Remove plist files unless blocked
+      if self.launchd_setup:
+        # In self-destruct mode we still need these plists for launchctl
+        if not self.self_destruct:
+          if self._AgentPlistFileName() is not None:
+            agent_plist = os.path.join(self._LaunchAgentConfigDir(),
+                                       self._AgentPlistFileName())
+            if os.path.exists(agent_plist):
+              os.unlink(agent_plist)
+          daemon_plist = os.path.join(self._LaunchDaemonConfigDir(),
+                                      self._DaemonPlistFileName())
+          if os.path.exists(daemon_plist):
+            os.unlink(daemon_plist)
+        # Self-destruct or not, we can remove login item (Tiger)
+        self._RemoveAgentLoginItem()
+      # Unregister Keystone ticket (if installed at all).
+      if os.path.exists(self._KeystoneBundlePath()):
+        ksadmin_path = self._KsadminPath()
+        if not ksadmin_path or not os.path.exists(ksadmin_path):
+          raise Error(self.package, self.root, 'ksadmin not available')
+        cmd = [ksadmin_path,
+               # store is specified explicitly so unit tests work
+               '--store', os.path.join(self._KeystoneTicketStorePath(),
+                                       'Keystone.ticketstore'),
+               '--delete', '--productid', 'com.google.Keystone']
+        (result, out, errout) = self.RunCommand(cmd)
+        if result != 0 and errout.find('No ticket to delete') == -1:
+          raise Error(self.package, self.root,
+              'Keystone ticket uninstall failed (%d): %s' % (result, errout))
+      # Remove the Keystone bundle
+      if os.path.exists(self._KeystoneBundlePath()):
+        shutil.rmtree(self._KeystoneBundlePath())
+      # Clean up caches. Race condition here if self-destructing, but unlikely
+      # and we'll just leak a cache dir.
+      if os.path.exists(self._LibraryCachesDirPath()):
+        caches = glob.glob(os.path.join(self._LibraryCachesDirPath(),
+                                        'com.google.Keystone.*'))
+        caches.extend(glob.glob(os.path.join(self._LibraryCachesDirPath(),
+                                        'com.google.UpdateEngine.*')))
+        caches.extend(glob.glob(os.path.join(self._LibraryCachesDirPath(),
+                                        'UpdateEngine-Temp')))
+        for cache_item in caches:
+          if os.path.isdir(cache_item):
+            shutil.rmtree(cache_item, True)  # Ignore cache deletion errors
+          else:
+            try:
+              os.unlink(cache_item)
+            except OSError:
+              pass
+      # Clean up preferences, this prevents old installations from propagating
+      # dates (like uninstall embargo time) forward in a complete uninstall/
+      # reinstall scenario. Again, race condition here for self-destruct case
+      # but the risk is minor and only leaks a pref file.
+      if self.is_system:
+        agent_pref_path = os.path.join(pwd.getpwuid(self.agent_job_uid)[5],
+                                       'Library/Preferences/'
+                                       'com.google.Keystone.Agent.plist')
+      else:
+        agent_pref_path = os.path.expanduser('~/Library/Preferences/'
+                                             'com.google.Keystone.Agent.plist')
+      if os.path.exists(agent_pref_path):
+        os.unlink(agent_pref_path)
+    finally:
+      if self.is_system:
+        self._ClearSystemInstallPermissions()
+    # Remove receipts
+    self.RemoveReceipts()
+    # With all other files removed, cleanup processes and job control files in
+    # the self-destruct case. This will presumably kill our parent, so after
+    # this no one is listening for our errors. We do it as late as possible.
+    if self.self_destruct:
+      if self.launchd_setup and self.launchd_jobs:
+        self._ChangeAgentRunStatus(False, True)
+        if self.is_system:
+          self._ChangeDaemonRunStatus(False, True)
+      if self.is_system:
+        self._SetSystemInstallPermissions()
+      try:
+        # We needed these plists to stop the agent and daemon. No one is
+        # listening to errors, but failure only leaves a stale launchctl file
+        # (actual program files removed above)
+        if self._AgentPlistFileName() is not None:
+          agent_plist = os.path.join(self._LaunchAgentConfigDir(),
+                                     self._AgentPlistFileName())
+          if os.path.exists(agent_plist):
+            os.unlink(agent_plist)
+        daemon_plist = os.path.join(self._LaunchDaemonConfigDir(),
+                                    self._DaemonPlistFileName())
+        if os.path.exists(daemon_plist):
+          os.unlink(daemon_plist)
+      finally:
+        if self.is_system:
+          self._ClearSystemInstallPermissions()
+
+  def Nuke(self):
+    """Perform an uninstall and remove all files (including tickets)"""
+    # Uninstall
+    self.Uninstall()
+    # Nuke what's left
+    if self.is_system:
+      self._SetSystemInstallPermissions()
+    try:
+      # Remove whole Keystone tree
+      if os.path.exists(self._KeystoneDirPath()):
+        shutil.rmtree(self._KeystoneDirPath())
+    finally:
+      if self.is_system:
+        self._ClearSystemInstallPermissions()
+
+  def RemoveReceipts(self):
+    """Remove receipts from Apple's package database, allowing downgrade or
+    reinstall."""
+    # Only works on system installs
+    if self.is_system:
+      self._SetSystemInstallPermissions()
+      try:
+        # In theory we should only handle old-style receipts on older OS
+        # versions. However, we don't know the upgrade history of the machine.
+        # So we try all variants.
+        if os.path.isdir('/Library/Receipts/Keystone.pkg'):
+          shutil.rmtree('/Library/Receipts/Keystone.pkg', True)
+        if os.path.exists('/Library/Receipts/Keystone.pkg'):
+          try:
+            os.unlink('/Library/Receipts/Keystone.pkg')
+          except OSError:
+            pass
+        if os.path.isdir('/Library/Receipts/UninstallKeystone.pkg'):
+          shutil.rmtree('/Library/Receipts/UninstallKeystone.pkg', True)
+        if os.path.exists('/Library/Receipts/UninstallKeystone.pkg'):
+          try:
+            os.unlink('/Library/Receipts/UninstallKeystone.pkg')
+          except OSError:
+            pass
+        if os.path.isdir('/Library/Receipts/NukeKeystone.pkg'):
+          shutil.rmtree('/Library/Receipts/NukeKeystone.pkg', True)
+        if os.path.exists('/Library/Receipts/NukeKeystone.pkg'):
+          try:
+            os.unlink('/Library/Receipts/NukeKeystone.pkg')
+          except OSError:
+            pass
+        # pkgutil where appropriate (ignoring results)
+        if os.path.exists('/usr/sbin/pkgutil'):
+          self.RunCommand(['/usr/sbin/pkgutil', '--forget',
+                           'com.google.pkg.Keystone'])
+          self.RunCommand(['/usr/sbin/pkgutil', '--forget',
+                           'com.google.pkg.UninstallKeystone'])
+          self.RunCommand(['/usr/sbin/pkgutil', '--forget',
+                           'com.google.pkg.NukeKeystone'])
+      finally:
+        self._ClearSystemInstallPermissions()
+
+  def FixupProducts(self):
+    """Attempt to repair any products might be broken."""
+    if self.is_system:
+      self._SetSystemInstallPermissions()
+    try:
+      # Remove the (original) Google Updater manifest files.  Stale manifest
+      # caches prevent Updater from checking for updates and downloading its
+      # auto-uninstall package. Stomp those files everywhere we can.
+      try:
+        os.unlink(os.path.expanduser('~/Library/Application Support/'
+                                     'Google/SoftwareUpdates/manifest.xml'))
+      except OSError:
+        pass
+      if self.agent_job_uid is not None:
+        try:
+          os.unlink(os.path.join(pwd.getpwuid(self.agent_job_uid)[5],
+                                 'Library/Application Support/'
+                                 'Google/SoftwareUpdates/manifest.xml'))
+        except OSError:
+          pass
+      try:
+        os.unlink(os.path.join(self.root, 'Library/Application Support/'
+                               'Google/SoftwareUpdates/manifest.xml'))
+      except OSError:
+        pass
+      try:
+        os.unlink('/Library/Caches/Google/SoftwareUpdates/manifest.xml')
+      except OSError:
+        pass
+
+      # Google Talk Plugin 1.0.15.1351 can have its existence checker
+      # pointing to a deleted directory.  Fix up the xc so it'll update
+      # next time.
+      if self.is_system:
+        # See if there's a talk plugin ticket.
+        ksadmin_path = self._KsadminPath()
+        if ksadmin_path and os.path.exists(ksadmin_path):
+          (result, out, errout) = self.RunCommand([ksadmin_path, '--productid',
+              'com.google.talkplugin', '-p'])
+          if out.find('1.0.15.1351') != -1:
+            # Fix the ticket by reregistering it.
+            # We can only get here if 1.0.15.1351 is the current version, so
+            # it's safe to use that version.
+            (result, out, errout) = self.RunCommand([ksadmin_path, '--register',
+                '--productid', 'com.google.talkplugin',
+                '--xcpath',
+                '/Library/Internet Plug-Ins/googletalkbrowserplugin.plugin',
+                '--version', '1.0.15.1351',
+                '--url', 'https://tools.google.com/service/update2'])
+    finally:
+      if self.is_system:
+        self._ClearSystemInstallPermissions()
+
+# -------------------------------------------------------------------------
+
+class KeystoneInstallTiger(KeystoneInstall):
+
+  """Like KeystoneInstall, but overrides a few methods to support 10.4"""
+
+  def _AgentPlistFileName(self):
+    return None
+
+  def _DaemonPlistFileName(self):
+    return 'com.google.keystone.daemon4.plist'
+
+  def _InstallAgentLoginItem(self):
+    # This will write to the Library domain as root/wheel, which is OK because
+    # permissions on /Library/Preferences still allow admin group to modify
+    if self.is_system:
+      domain = '/Library/Preferences/loginwindow'
+    else:
+      domain = 'loginwindow'
+    (result, out, errout) = self.RunCommand(
+        ['/usr/bin/defaults', 'write', domain,
+         'AutoLaunchedApplicationDictionary', '-array-add',
+         '{Hide = 1; Path = "%s"; }' % self._KeystoneAgentPath()])
+    if result == 0:
+      return
+    # An empty AutoLaunchedApplicationDictionary is an empty string,
+    # not an empty array, in which case -array-add chokes.  There is
+    # no easy way to do a typeof(AutoLaunchedApplicationDictionary)
+    # for a plist. Our solution is to catch the error and try a
+    # different way.
+    (result, out, errout) = self.RunCommand(
+        ['/usr/bin/defaults', 'write', domain,
+         'AutoLaunchedApplicationDictionary', '-array',
+         '{Hide = 1; Path = "%s"; }' % self._KeystoneAgentPath()])
+    if result != 0:
+      raise Error(self.package, self.root,
+                  'Keystone agent login item in domain "%s" failed (%d): %s' %
+                  (domain, result, errout))
+
+  def _ChangeAgentRunStatus(self, start, ignore_failure):
+    """Start the agent as a normal (non-launchd) process on Tiger."""
+    if self.is_system:
+      self._SetSystemInstallPermissions()
+    try:
+      # Start
+      if start:
+        if self.is_system:
+          # Tiger 'sudo' has problems with numeric uid so use username (man
+          # page wrong)
+          username = pwd.getpwuid(self.agent_job_uid)[0]
+          (result, out, errout) = self.RunCommand(['/usr/bin/sudo',
+                                                   '-u', username,
+                                                   '/usr/bin/open',
+                                                   self._KeystoneAgentPath()])
+          if not ignore_failure and result != 0:
+            raise Error(self.package, self.root,
+                        'Failed to start system agent for uid %d (%d): %s' %
+                        (self.agent_job_uid, result, errout))
+        else:
+          (result, out, errout) = self.RunCommand(['/usr/bin/open',
+                                                   self._KeystoneAgentPath()])
+          if not ignore_failure and result != 0:
+            raise Error(self.package, self.root,
+                        'Failed to start user agent (%d): %s' %
+                        (result, errout))
+      # Stop
+      else:
+        if self.is_system:
+          cmd = ['/usr/bin/killall', '-u', str(self.agent_job_uid),
+                 self._AgentProcessName()]
+        else:
+          cmd = ['/usr/bin/killall', self._AgentProcessName()]
+        (result, out, errout) = self.RunCommand(cmd)
+        if (not ignore_failure and result != 0 and
+            out.find('No matching processes') == -1):
+          raise Error(self.package, self.root,
+                      'Failed to kill agent (%d): %s' % (result, errout))
+    finally:
+      if self.is_system:
+        self._ClearSystemInstallPermissions()
+
+  def _ClearQuarantine(self, path):
+    """Remove LaunchServices quarantine attributes from a file hierarchy."""
+    # Tiger does not implement quarantine (http://support.apple.com/kb/HT3662)
+    return
+
+
+# -------------------------------------------------------------------------
+
+class Keystone(object):
+
+  """Top-level interface for Keystone install and uninstall.
+
+  Attributes:
+    install_class: KeystoneInstall subclass to use for installation
+    installer: KeystoneInstall instance (system or user)
+  """
+
+  def __init__(self, package, root, launchd_setup, start_jobs, self_destruct):
+    # Sanity
+    if package:
+      package = os.path.abspath(os.path.expanduser(package))
+      CheckOnePath(package, stat.S_IRUSR)
+    if root:
+      expanded_root = os.path.abspath(os.path.expanduser(root))
+      assert (expanded_root and
+              len(expanded_root) > 0), 'Root is empty after expansion'
+      # Force user-supplied root to pre-exist, this was a side effect of
+      # prior versions of the code and the tests assume its part of the contract
+      CheckOnePath(root, stat.S_IWUSR)
+    # Setup installer instances
+    self.install_class = KeystoneInstall
+    if self._IsTiger():
+      self.install_class = KeystoneInstallTiger
+    if self._IsPrivilegedInstall():
+      # Install using privileges on behalf of other user (for agent start)
+      install_uid = self._LocalUserUID()
+      if root is not None:
+        self.installer = self.install_class(package, True, install_uid, root,
+                                            launchd_setup, start_jobs,
+                                            self_destruct)
+      else:
+        self.installer = self.install_class(package, True, install_uid,
+                                            self._DefaultRootForUID(0),
+                                            launchd_setup, start_jobs,
+                                            self_destruct)
+    else:
+      # Non-system install, no attempt at privilege changes
+      if root is not None:
+        self.installer = self.install_class(package, False, None, root,
+                                            launchd_setup, start_jobs,
+                                            self_destruct)
+      else:
+        self.installer = self.install_class(package, False, None,
+                                            self._DefaultRootForUID(
+                                                self._LocalUserUID()),
+                                            launchd_setup, start_jobs,
+                                            self_destruct)
+
+  def _LocalUserUID(self):
+    """Return the UID of the local (non-root) user who initiated this
+    install/uninstall.  If we can't figure it out, default to the user
+    on conosle.  We don't want to default to console user in case a
+    FUS happens in the middle of install or uninstall."""
+    uid = os.geteuid()
+    if uid != 0:
+      return uid
+    else:
+      return os.stat('/dev/console')[stat.ST_UID]
+
+  def _IsLeopardOrLater(self):
+    """Return True if we're on 10.5 or later; else return False."""
+    global FORCE_TIGER
+    if FORCE_TIGER:
+      return False
+    # Ouch!  platform.mac_ver() returns strange results.
+    # ('10.7', ('', '', ''), 'i386')        - 10.7, python2.7
+    # ('10.7.0', ('', '', ''), 'i386')      - 10.7, python2.5 or python2.6
+    # ('10.6.7', ('', '', ''), 'i386')      - 10.6, python2.5 or python2.6
+    # ('10.5.1', ('', '', ''), 'i386')      - 10.5, python2.4 or python2.5
+    # ('', ('', '', ''), '')                - 10.4, python2.3 (also 2.4)
+    (vers, ignored1, ignored2) = platform.mac_ver()
+    splits = vers.split('.')
+    # Try to break down a proper version number
+    if ((len(splits) == 2) or (len(splits) == 3)) and (splits[1] >= '5'):
+      return True
+    # Tiger is rare these days, so unless we're on 2.3 build of Python
+    # assume we must be newer.
+    if (((sys.version_info[0] == 2) and (sys.version_info[1] == 3)) or
+        ((sys.version_info[0] == 2) and (sys.version_info[1] == 4) and
+         (vers == ''))):
+      return False
+    else:
+      return True
+
+  def _IsTiger(self):
+    """Return the boolean opposite of IsLeopardOrLater()."""
+    if self._IsLeopardOrLater():
+      return False
+    else:
+      return True
+
+  def _IsPrivilegedInstall(self):
+    """Return True if this is a privileged (root) install."""
+    if os.geteuid() == 0:
+      return True
+    else:
+      return False
+
+  def _DefaultRootForUID(self, uid):
+    """For the given UID, return the default install root for Keystone (where
+    is is, or where it should be, installed)."""
+    if uid == 0:
+      return '/'
+    else:
+      return pwd.getpwuid(uid)[5]
+
+  def _ShouldInstall(self):
+    """Return True if we should on install.
+
+    Possible reasons for punting (returning False):
+    1) This is a System Keystone install and the installed System
+       Keystone has a smaller version.
+    2) This is a User Keystone and there is a System Keystone
+       installed (of any version).
+    3) This is a User Keystone and the installed User Keystone has a
+       smaller version.
+    """
+    if self._IsPrivilegedInstall():
+      if self.installer.IsMyVersionGreaterThanInstalledVersion():
+        return True
+      else:
+        return False
+    else:
+      # User install, need to check if system install exists
+      system_checker = self.install_class(None, False, None,
+                                          self._DefaultRootForUID(0),
+                                          False, False, False)
+      if system_checker.InstalledKeystoneBundleVersion() != None:
+        return False
+      # Check just user version
+      if self.installer.IsMyVersionGreaterThanInstalledVersion():
+        return True
+      else:
+        return False
+
+  def Install(self, force, lockdown):
+    """Public install interface.
+
+      force: If True, no version check is performed.
+      lockdown: if True, install a special ticket to lock down Keystone
+                and prevent uninstall.  This will happen even if an install
+                of Keystone itself is not needed.
+    """
+    if force or self._ShouldInstall():
+      self.installer.Install()
+    # possibly lockdown even if we don't need to install
+    if lockdown:
+      self.installer.LockdownKeystone()
+
+  def Uninstall(self):
+    """Uninstall, which has the effect of preparing this machine for a new
+    install. Although similar, it is NOT as comprehensive as a nuke.
+    """
+    self.installer.Uninstall()
+
+  def Nuke(self):
+    """Public nuke interface. Typically only used for testing."""
+    self.installer.Nuke()
+
+  def RemoveReceipts(self):
+    """Public receipt removal interface. Used by uninstall, and to allow
+    downgraades of system installations."""
+    self.installer.RemoveReceipts()
+
+  def FixupProducts(self):
+    """Attempt to repair any products might have broken tickets."""
+    self.installer.FixupProducts()
+
+# -------------------------------------------------------------------------
+
+def PrintUse():
+  print 'Use: '
+  print ' [--install PKG]     Install keystone using PKG as the source.'
+  print ' [--root ROOT]       Use ROOT as the dest for an install. Optional.'
+  print ' [--uninstall]       Remove Keystone program files but do NOT delete '
+  print '                       the ticket store.'
+  print ' [--nuke]            Remove Keystone and all tickets.'
+  print ' [--remove-receipts] Remove Keystone package receipts, allowing for '
+  print '                       downgrade (system install only)'
+  print ' [--no-launchd]      Do NOT touch Keystone launchd plists or jobs,'
+  print '                       for both install and uninstall. For test.'
+  print ' [--no-launchdjobs]  Do NOT start/stop jobs, but do change launchd'
+  print '                       plist files,for both install and uninstall.'
+  print '                       For test.'
+  print ' [--self-destruct]   Use if uninstall is triggered by process that '
+  print '                       will be killed by uninstall.'
+  print ' [--force]           Force an install no matter what. For test.'
+  print ' [--forcetiger]      Pretend we are on Tiger (MacOSX 10.4). For test.'
+  print ' [--lockdown]        Prevent Keystone from ever uninstalling itself.'
+  print ' [--interval N]      Change agent plist to wake up every N seconds.'
+  print ' [--help]            This message.'
+
+
+def main():
+  os.environ.clear()
+  os.environ['PATH'] = '/bin:/sbin:/usr/bin:/usr/sbin:/usr/libexec'
+
+  # Make sure AuthorizationExecuteWithPrivileges() is happy
+  if os.getuid() and os.geteuid() == 0:
+    os.setuid(os.geteuid())
+
+  try:
+    opts, args = getopt.getopt(sys.argv[1:], 'i:r:XunNhfI:',
+                               ['install=', 'root=', 'nuke', 'uninstall',
+                                'remove-receipts', 'no-launchd',
+                                'no-launchdjobs', 'self-destruct', 'help',
+                                'force', 'forcetiger', 'lockdown', 'interval='])
+  except getopt.GetoptError:
+    print 'Bad options.'
+    PrintUse()
+    sys.exit(1)
+
+  root = None
+  package = None
+  nuke = False
+  uninstall = False
+  remove_receipts = False
+  launchd_setup = True
+  start_jobs = True
+  self_destruct = False
+  force = False
+  lockdown = False  # If true, prevent uninstall by adding a "lockdown" ticket
+
+  for opt, val in opts:
+    if opt in ('-i', '--install'):
+      package = val
+    if opt in ('-r', '--root'):
+      root = val
+    if opt in ('-X', '--nuke'):
+      nuke = True
+    if opt in ('-u', '--uninstall'):
+      uninstall = True
+    if opt in ('--remove-receipts'):
+      remove_receipts = True
+    if opt in ('-n', '--no-launchd'):
+      launchd_setup = False
+    if opt in ('-N', '--no-launchdjobs'):
+      start_jobs = False
+    if opt in ('--self-destruct'):
+      self_destruct = True
+    if opt in ('-f', '--force'):
+      force = True
+    if opt in ('-T', '--forcetiger'):
+      global FORCE_TIGER
+      FORCE_TIGER = True
+    if opt in ('--lockdown',):
+      lockdown = True
+    if opt in ('-I', '--interval'):
+      global AGENT_START_INTERVAL
+      AGENT_START_INTERVAL = int(val)
+    if opt in ('-h', '--help'):
+      PrintUse()
+      sys.exit(0)
+
+  if package is None and not nuke and not uninstall and not remove_receipts:
+    print 'Must specify package path, uninstall, nuke, or remove-receipts'
+    PrintUse()
+    sys.exit(1)
+  try:
+    (vers, ignored1, ignored2) = platform.mac_ver()
+    splits = vers.split('.')
+    if (len(splits) == 3) and (int(splits[1]) < 4):
+      print 'Requires Mac OS 10.4 or later'
+      sys.exit(1)
+  except:
+    # 10.3 throws an exception for platform.mac_ver()
+    print 'Requires Mac OS 10.4 or later'
+    sys.exit(1)
+
+  # Lock file to make sure only one Keystone install at once. We want to
+  # share this lock amongst all users on the machine.
+  lockfilename = '/tmp/.keystone_install_lock'
+  oldmask = os.umask(0000)
+  lockfile = os.open(lockfilename, os.O_CREAT | os.O_RDONLY | os.O_NOFOLLOW,
+                     0444)
+  os.umask(oldmask)
+  # Lock, callers that cannot wait are expected to kill us.
+  fcntl.flock(lockfile, fcntl.LOCK_EX)
+
+  try:
+    try:
+      k = Keystone(package, root, launchd_setup, start_jobs, self_destruct)
+      # Ordered by level of cleanup applied
+      if nuke:
+        k.Nuke()
+      elif uninstall:
+        k.Uninstall()
+      elif remove_receipts:
+        k.RemoveReceipts()
+      else:
+        k.Install(force, lockdown)
+        k.FixupProducts()
+    except Error, e:
+      print e  # To conform to previous contract on this tool (see headerdoc)
+      raise  # So that the backtrace ends up on stderr
+  finally:
+    os.close(lockfile)  # Lock file left around on purpose
+
+
+if __name__ == "__main__":
+  main()