lttng-ust-java-tests-common/src/main/java/org/lttng/ust/agent/utils/LttngUtils.java

   1 /*
   2  * Copyright (C) 2015, EfficiOS Inc., Alexandre Montplaisir <alexmonthy@efficios.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 package org.lttng.ust.agent.utils;
  20
  21 import java.util.Arrays;
  22 import java.util.List;
  23
  24 import org.lttng.tools.ILttngSession;
  25 import org.lttng.tools.ILttngSession.Domain;
  26 import org.lttng.tools.utils.ShellUtils;
  27
  28 /**
  29  * Utility methods to test the presence of certain LTTng tools or libraries in
  30  * the runtime environment.
  31  */
  32 public final class LttngUtils {
  33
  34     private LttngUtils() {}
  35
  36     /**
  37      * Check that lttng-tools and babeltrace are installed on the system and
  38      * working.
  39      *
  40      * @param domain
  41      *            The tracing domain to test for (we will try to setup a session
  42      *            with this domain)
  43      * @return True if the environment should allow tracing fine, false if there
  44      *         was an error
  45      */
  46     public static boolean checkForLttngTools(Domain domain) {
  47         try (ILttngSession session = ILttngSession.createSession(null, domain)) {
  48             boolean ret1 = session.enableAllEvents();
  49             boolean ret2 = session.start();
  50             boolean ret3 = session.stop();
  51             /*
  52              * "lttng view" also tests that Babeltrace is installed and working
  53              */
  54             List<String> contents = session.view();
  55             return (ret1 && ret2 && ret3 && contents.isEmpty());
  56         }
  57     }
  58
  59     /**
  60      * Check if there is a user session daemon currently running on the system.
  61      * It needs to be of the same user as the application running this program.
  62      *
  63      * @return If there is a user session daemon currently running
  64      */
  65     public static boolean checkForUserSessiond() {
  66         String userName = System.getProperty("user.name");
  67
  68         /* The user name is truncated to 7 characters in "ps" */
  69         String shortUserName = userName.substring(0, Math.min(userName.length(), 7));
  70
  71         List<String> command = Arrays.asList("ps", "-e", "u");
  72         List<String> output = ShellUtils.getOutputFromCommand(false, command);
  73         return output.stream()
  74                 .filter(s -> s.contains("lttng-sessiond"))
  75                 .anyMatch(s -> s.startsWith(shortUserName));
  76     }
  77
  78     /**
  79      * Check if there is a root user session daemon daemon currently running on
  80      * the system.
  81      *
  82      * @return If there is a root session daemon currently running
  83      */
  84     public static boolean checkForRootSessiond() {
  85         List<String> command = Arrays.asList("ps", "-e", "u");
  86         List<String> output = ShellUtils.getOutputFromCommand(false, command);
  87         return output.stream()
  88                 .filter(s -> s.contains("lttng-sessiond"))
  89                 .anyMatch(s -> s.startsWith("root"));
  90     }
  91
  92 }