2 * Copyright (C) 2015, EfficiOS Inc., Alexandre Montplaisir <alexmonthy@efficios.com>
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.
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.
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.
19 package org
.lttng
.ust
.agent
.utils
;
21 import java
.util
.Arrays
;
22 import java
.util
.List
;
24 import org
.lttng
.tools
.ILttngSession
;
25 import org
.lttng
.tools
.ILttngSession
.Domain
;
26 import org
.lttng
.tools
.utils
.ShellUtils
;
29 * Utility methods to test the presence of certain LTTng tools or libraries in
30 * the runtime environment.
32 public final class LttngUtils
{
34 private LttngUtils() {}
37 * Check that lttng-tools and babeltrace are installed on the system and
41 * The tracing domain to test for (we will try to setup a session
43 * @return True if the environment should allow tracing fine, false if there
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();
52 * "lttng view" also tests that Babeltrace is installed and working
54 List
<String
> contents
= session
.view();
55 return (ret1
&& ret2
&& ret3
&& contents
.isEmpty());
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.
63 * @return If there is a user session daemon currently running
65 public static boolean checkForUserSessiond() {
66 String userName
= System
.getProperty("user.name");
68 /* The user name is truncated to 7 characters in "ps" */
69 String shortUserName
= userName
.substring(0, Math
.min(userName
.length(), 7));
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
));
79 * Check if there is a root user session daemon daemon currently running on
82 * @return If there is a root session daemon currently running
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"));
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