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         System.out.println("Sanity check: start");
  48         try (ILttngSession session = ILttngSession.createSession(null, domain)) {
  49             boolean ret1 = session.enableAllEvents();
  50             boolean ret2 = session.start();
  51             boolean ret3 = session.stop();
  52             /*
  53              * "lttng view" also tests that Babeltrace is installed and working
  54              */
  55             List<String> contents = session.view();
  56             if (!contents.isEmpty()) {
  57                 System.out.print(String.join("\n", contents));
  58             }
  59             System.out.println("Sanity check: end");
  60             return (ret1 && ret2 && ret3 && contents.isEmpty());
  61         }
  62     }
  63
  64     /**
  65      * Check if there is a user session daemon currently running on the system.
  66      * It needs to be of the same user as the application running this program.
  67      *
  68      * @return If there is a user session daemon currently running
  69      */
  70     public static boolean checkForUserSessiond() {
  71         String userName = System.getProperty("user.name");
  72
  73         /* The user name is truncated to 7 characters in "ps" */
  74         String shortUserName = userName.substring(0, Math.min(userName.length(), 7));
  75
  76         List<String> command = Arrays.asList("ps", "-e", "u");
  77         List<String> output = ShellUtils.getOutputFromCommand(false, command);
  78         return output.stream()
  79                 .filter(s -> s.contains("lttng-sessiond"))
  80                 .anyMatch(s -> s.startsWith(shortUserName));
  81     }
  82
  83     /**
  84      * Check if there is a root user session daemon daemon currently running on
  85      * the system.
  86      *
  87      * @return If there is a root session daemon currently running
  88      */
  89     public static boolean checkForRootSessiond() {
  90         List<String> command = Arrays.asList("ps", "-e", "u");
  91         List<String> output = ShellUtils.getOutputFromCommand(false, command);
  92         return output.stream()
  93                 .filter(s -> s.contains("lttng-sessiond"))
  94                 .anyMatch(s -> s.startsWith("root"));
  95     }
  96
  97 }