Clean-up: lttng: silence warning in metadata command handler
[lttng-tools.git] / src / bin / lttng / commands / metadata.c
1 /*
2 * Copyright (C) 2015 - Julien Desfossez <jdesfossez@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, version 2 only,
6 * as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16 */
17
18 #define _LGPL_SOURCE
19 #include <assert.h>
20 #include <ctype.h>
21 #include <popt.h>
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include <string.h>
25 #include <unistd.h>
26
27 #include <common/mi-lttng.h>
28
29 #include "../command.h"
30
31 static char *opt_session_name;
32 static char *session_name = NULL;
33
34 static int metadata_regenerate(int argc, const char **argv);
35
36 #ifdef LTTNG_EMBED_HELP
37 static const char help_msg[] =
38 #include <lttng-metadata.1.h>
39 ;
40 #endif
41
42 enum {
43 OPT_HELP = 1,
44 OPT_LIST_OPTIONS,
45 OPT_LIST_COMMANDS,
46 };
47
48 static struct mi_writer *writer;
49
50 static struct poptOption long_options[] = {
51 /* { longName, shortName, argInfo, argPtr, value, descrip, argDesc, } */
52 { "help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0, },
53 { "session", 's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0},
54 { "list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, 0, 0, },
55 { "list-commands", 0, POPT_ARG_NONE, NULL, OPT_LIST_COMMANDS},
56 { 0, 0, 0, 0, 0, 0, 0, },
57 };
58
59 static struct cmd_struct actions[] = {
60 { "regenerate", metadata_regenerate },
61 { NULL, NULL } /* Array closure */
62 };
63
64 /*
65 * Count and return the number of arguments in argv.
66 */
67 static int count_arguments(const char **argv)
68 {
69 int i = 0;
70
71 assert(argv);
72
73 while (argv[i] != NULL) {
74 i++;
75 }
76
77 return i;
78 }
79
80 static int metadata_regenerate(int argc, const char **argv)
81 {
82 int ret;
83
84 if (argc > 1) {
85 ret = CMD_UNDEFINED;
86 goto end;
87 }
88 ret = lttng_regenerate_metadata(session_name);
89 if (ret == 0) {
90 MSG("Metadata successfully regenerated for session %s", session_name);
91 } else {
92 ERR("%s", lttng_strerror(ret));
93 }
94
95 end:
96 return ret;
97 }
98
99 static int handle_command(const char **argv)
100 {
101 struct cmd_struct *cmd;
102 int ret = CMD_SUCCESS, i = 0, argc, command_ret = CMD_SUCCESS;
103
104 if (argv == NULL) {
105 ERR("No action specified for metadata command.");
106 ret = CMD_ERROR;
107 goto end;
108 }
109
110 argc = count_arguments(argv);
111 assert(argc >= 1);
112
113 cmd = &actions[i];
114 while (cmd->func != NULL) {
115 /* Find command */
116 if (strcmp(argv[0], cmd->name) == 0) {
117 if (lttng_opt_mi) {
118 /* Action element */
119 ret = mi_lttng_writer_open_element(writer,
120 mi_lttng_element_command_metadata_action);
121 if (ret) {
122 ret = CMD_ERROR;
123 goto end;
124 }
125
126 /* Name of the action */
127 ret = mi_lttng_writer_write_element_string(writer,
128 config_element_name, argv[0]);
129 if (ret) {
130 ret = CMD_ERROR;
131 goto end;
132 }
133 }
134 command_ret = cmd->func(argc, argv);
135 if (lttng_opt_mi) {
136 /* Close output and action element */
137 ret = mi_lttng_writer_close_element(writer);
138 if (ret) {
139 ret = CMD_ERROR;
140 goto end;
141 }
142 }
143 goto end;
144 }
145
146 cmd = &actions[i++];
147 }
148
149 ret = CMD_UNDEFINED;
150
151 end:
152 /* Overwrite ret if an error occurred in cmd->func() */
153 ret = command_ret ? command_ret : ret;
154 return ret;
155 }
156
157 /*
158 * Metadata command handling.
159 */
160 int cmd_metadata(int argc, const char **argv)
161 {
162 int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1;
163 static poptContext pc;
164
165 if (argc < 1) {
166 SHOW_HELP();
167 ret = CMD_ERROR;
168 goto end;
169 }
170
171 pc = poptGetContext(NULL, argc, argv, long_options, 0);
172 poptReadDefaultConfig(pc, 0);
173
174 if (lttng_opt_mi) {
175 writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
176 if (!writer) {
177 ret = -LTTNG_ERR_NOMEM;
178 goto end;
179 }
180 /* Open command element */
181 ret = mi_lttng_writer_command_open(writer,
182 mi_lttng_element_command_metadata);
183 if (ret) {
184 ret = CMD_ERROR;
185 goto end;
186 }
187
188 /* Open output element */
189 ret = mi_lttng_writer_open_element(writer,
190 mi_lttng_element_command_output);
191 if (ret) {
192 ret = CMD_ERROR;
193 goto end;
194 }
195 }
196
197 while ((opt = poptGetNextOpt(pc)) != -1) {
198 switch (opt) {
199 case OPT_HELP:
200 SHOW_HELP();
201 goto end;
202 case OPT_LIST_OPTIONS:
203 list_cmd_options(stdout, long_options);
204 goto end;
205 case OPT_LIST_COMMANDS:
206 list_commands(actions, stdout);
207 goto end;
208 default:
209 SHOW_HELP();
210 ret = CMD_UNDEFINED;
211 goto end;
212 }
213 }
214
215 if (!opt_session_name) {
216 session_name = get_session_name();
217 if (session_name == NULL) {
218 ret = CMD_ERROR;
219 goto end;
220 }
221 } else {
222 session_name = opt_session_name;
223 }
224
225 command_ret = handle_command(poptGetArgs(pc));
226 if (command_ret) {
227 success = 0;
228 }
229
230 if (lttng_opt_mi) {
231 /* Close output element */
232 ret = mi_lttng_writer_close_element(writer);
233 if (ret) {
234 ret = CMD_ERROR;
235 goto end;
236 }
237
238 /* Success ? */
239 ret = mi_lttng_writer_write_element_bool(writer,
240 mi_lttng_element_command_success, success);
241 if (ret) {
242 ret = CMD_ERROR;
243 goto end;
244 }
245
246 /* Command element close */
247 ret = mi_lttng_writer_command_close(writer);
248 if (ret) {
249 ret = CMD_ERROR;
250 goto end;
251 }
252 }
253
254 end:
255 /* Mi clean-up */
256 if (writer && mi_lttng_writer_destroy(writer)) {
257 /* Preserve original error code */
258 ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL;
259 }
260
261 if (!opt_session_name) {
262 free(session_name);
263 }
264
265 /* Overwrite ret if an error occurred during handle_command() */
266 ret = command_ret ? command_ret : ret;
267
268 poptFreeContext(pc);
269 return ret;
270 }
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