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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 | ||
b01fe762 | 19 | package org.lttng.ust.agent.utils; |
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20 | |
21 | import java.io.IOException; | |
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22 | import java.util.Arrays; |
23 | import java.util.List; | |
24 | ||
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25 | import org.lttng.tools.ILttngSession; |
26 | import org.lttng.tools.ILttngSession.Domain; | |
b01fe762 | 27 | import org.lttng.tools.utils.ShellUtils; |
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28 | import org.lttng.ust.agent.jul.LttngLogHandler; |
29 | import org.lttng.ust.agent.log4j.LttngLogAppender; | |
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30 | |
31 | /** | |
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32 | * Utility methods to test the presence of certain LTTng tools or libraries in |
33 | * the runtime environment. | |
8576633f | 34 | */ |
45d1768c | 35 | public final class LttngUtils { |
8576633f | 36 | |
45d1768c | 37 | private LttngUtils() {} |
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38 | |
39 | /** | |
40 | * Check the the JUL native library is available, effectively allowing LTTng | |
41 | * JUL handlers to be used. | |
42 | * | |
43 | * @return True if JUL works fine, false if it does not. | |
44 | */ | |
45 | public static boolean checkForJulLibrary() { | |
46 | try { | |
47 | LttngLogHandler testHandler = new LttngLogHandler(); | |
48 | testHandler.close(); | |
49 | } catch (SecurityException | IOException e) { | |
50 | return false; | |
51 | } | |
52 | return true; | |
53 | } | |
54 | ||
55 | /** | |
56 | * Check the the Log4j native library is available, effectively allowing | |
57 | * LTTng Log4j appenders to be used. | |
58 | * | |
59 | * @return True if Log4j works fine, false if it does not. | |
60 | */ | |
61 | public static boolean checkForLog4jLibrary() { | |
62 | try { | |
63 | LttngLogAppender testAppender = new LttngLogAppender(); | |
64 | testAppender.close(); | |
65 | } catch (SecurityException | IOException e) { | |
66 | return false; | |
67 | } | |
68 | return true; | |
69 | } | |
70 | ||
71 | /** | |
72 | * Check that lttng-tools and babeltrace are installed on the system and | |
73 | * working. | |
74 | * | |
75 | * @param domain | |
76 | * The tracing domain to test for (we will try to setup a session | |
77 | * with this domain) | |
78 | * @return True if the environment should allow tracing fine, false if there | |
79 | * was an error | |
80 | */ | |
81 | public static boolean checkForLttngTools(Domain domain) { | |
ff620bef | 82 | try (ILttngSession session = ILttngSession.createSession(null, domain)) { |
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83 | boolean ret1 = session.enableAllEvents(); |
84 | boolean ret2 = session.start(); | |
85 | boolean ret3 = session.stop(); | |
86 | /* | |
87 | * "lttng view" also tests that Babeltrace is installed and working | |
88 | */ | |
89 | List<String> contents = session.view(); | |
90 | return (ret1 && ret2 && ret3 && contents.isEmpty()); | |
91 | } | |
92 | } | |
93 | ||
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94 | /** |
95 | * Check if there is a user session daemon currently running on the system. | |
96 | * It needs to be of the same user as the application running this program. | |
97 | * | |
98 | * @return If there is a user session daemon currently running | |
99 | */ | |
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100 | public static boolean checkForUserSessiond() { |
101 | String userName = System.getProperty("user.name"); | |
102 | ||
103 | /* The user name is truncated to 7 characters in "ps" */ | |
104 | String shortUserName = userName.substring(0, Math.min(userName.length(), 7)); | |
105 | ||
106 | List<String> command = Arrays.asList("ps", "-e", "u"); | |
7dfd1adf | 107 | List<String> output = ShellUtils.getOutputFromCommand(false, command); |
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108 | return output.stream() |
109 | .filter(s -> s.contains("lttng-sessiond")) | |
110 | .anyMatch(s -> s.startsWith(shortUserName)); | |
111 | } | |
112 | ||
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113 | /** |
114 | * Check if there is a root user session daemon daemon currently running on | |
115 | * the system. | |
116 | * | |
117 | * @return If there is a root session daemon currently running | |
118 | */ | |
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119 | public static boolean checkForRootSessiond() { |
120 | List<String> command = Arrays.asList("ps", "-e", "u"); | |
7dfd1adf | 121 | List<String> output = ShellUtils.getOutputFromCommand(false, command); |
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122 | return output.stream() |
123 | .filter(s -> s.contains("lttng-sessiond")) | |
124 | .anyMatch(s -> s.startsWith("root")); | |
125 | } | |
126 | ||
8576633f | 127 | } |