login_manager: Add dbus API for restarting entd when enterprise extensions installed

session_manager_service.cc

 // Copyright (c) 2009-2010 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "login_manager/session_manager_service.h"
 
 #include <dbus/dbus-glib-lowlevel.h>
 #include <errno.h>
 #include <glib.h>
 #include <grp.h>
@@ skipping 616 matching lines @@
   string arguments_string(arguments_buffer);
 
   child_jobs_[child_index]->SetArguments(arguments_string);
   child_pids_[child_index] = RunChild(child_jobs_[child_index]);
 
   // To set "logged-in" state for BWSI mode.
   return StartSession(const_cast<gchar*>(kIncognitoUser), NULL,
                       OUT_done, error);
 }
 
+gboolean SessionManagerService::RestartEntd(GError** error) {
+  LOG(INFO) << "Restarting entd.";
+  // Shutdown entd if it is currently running, blocking this thread and
+  // method call until it has finished shutting down.
+  int stop_status = system("/sbin/initctl stop entd");
+  // Stop may have failed, but it may be ok if not already running.  Error
+  // messages will go to session manager log.
+  LOG_IF(INFO, stop_status != 0)
+      << "Could not stop entd, likely was not running.";
+  string command = StringPrintf("/sbin/initctl start entd "
+                                "CHROMEOS_USER=%s",
+                                current_user_.c_str());
+  // Start entd with the current user passed in, blocking this thread
+  // and method call until it has finished starting.
+  bool restarted = (system(command.c_str()) == 0);
+  LOG(INFO) << "Restart was " << (restarted ? "" : "not ")
+            << "successful.";
+  return restarted;
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 // glib event handlers
 
 void SessionManagerService::HandleChildExit(GPid pid,
                                             gint status,
                                             gpointer data) {
   // If I could wait for descendants here, I would.  Instead, I kill them.
   kill(-pid, SIGKILL);
 
   DLOG(INFO) << "Handling child process exit.";
@@ skipping 341 matching lines @@
       arg_list.push_back(args[i_arg]);
     }
   }
   if (arg_list.size()) {
     arg_lists.push_back(arg_list);
   }
   return arg_lists;
 }
 
 }  // namespace login_manager