Fix: snapshot command mishandles missing arguments
[lttng-tools.git] / src / bin / lttng / commands / metadata.c
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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
31static char *opt_session_name;
32static char *session_name = NULL;
33
34static int metadata_regenerate(int argc, const char **argv);
35
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36#ifdef LTTNG_EMBED_HELP
37static const char help_msg[] =
38#include <lttng-metadata.1.h>
39;
40#endif
41
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42enum {
43 OPT_HELP = 1,
44 OPT_LIST_OPTIONS,
45 OPT_LIST_COMMANDS,
46};
47
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48static struct mi_writer *writer;
49
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50static 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
59static struct cmd_struct actions[] = {
60 { "regenerate", metadata_regenerate },
61 { NULL, NULL } /* Array closure */
62};
63
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64/*
65 * Count and return the number of arguments in argv.
66 */
67static 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
80static int metadata_regenerate(int argc, const char **argv)
81{
82 int ret;
83
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84 if (argc > 1) {
85 ret = -LTTNG_ERR_INVALID;
86 goto end;
87 }
eded6438 88 ret = lttng_regenerate_metadata(session_name);
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89 if (ret == 0) {
90 MSG("Metadata successfully regenerated for session %s", session_name);
91 }
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92
93end:
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94 return ret;
95}
96
97static int handle_command(const char **argv)
98{
99 struct cmd_struct *cmd;
100 int ret = CMD_SUCCESS, i = 0, argc, command_ret = CMD_SUCCESS;
101
102 if (argv == NULL) {
cfd1353e 103 ERR("argv is null");
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104 command_ret = CMD_ERROR;
105 goto end;
106 }
107
108 argc = count_arguments(argv);
109
110 cmd = &actions[i];
111 while (cmd->func != NULL) {
112 /* Find command */
113 if (strcmp(argv[0], cmd->name) == 0) {
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114 if (lttng_opt_mi) {
115 /* Action element */
116 ret = mi_lttng_writer_open_element(writer,
117 mi_lttng_element_command_metadata_action);
118 if (ret) {
119 ret = CMD_ERROR;
120 goto end;
121 }
122
123 /* Name of the action */
124 ret = mi_lttng_writer_write_element_string(writer,
125 config_element_name, argv[0]);
126 if (ret) {
127 ret = CMD_ERROR;
128 goto end;
129 }
130 }
93ec662e 131 command_ret = cmd->func(argc, argv);
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132 if (lttng_opt_mi) {
133 /* Close output and action element */
134 ret = mi_lttng_writer_close_element(writer);
135 if (ret) {
136 ret = CMD_ERROR;
137 goto end;
138 }
139 }
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140 goto end;
141 }
142
143 cmd = &actions[i++];
144 }
145
146 ret = CMD_UNDEFINED;
147
148end:
149 /* Overwrite ret if an error occurred in cmd->func() */
150 ret = command_ret ? command_ret : ret;
151 return ret;
152}
153
154/*
155 * Metadata command handling.
156 */
157int cmd_metadata(int argc, const char **argv)
158{
54897b57 159 int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1;
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160 static poptContext pc;
161
162 if (argc < 1) {
3b9c7d3f 163 SHOW_HELP();
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164 ret = CMD_ERROR;
165 goto end;
166 }
167
168 pc = poptGetContext(NULL, argc, argv, long_options, 0);
169 poptReadDefaultConfig(pc, 0);
170
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171 if (lttng_opt_mi) {
172 writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
173 if (!writer) {
174 ret = -LTTNG_ERR_NOMEM;
175 goto end;
176 }
177 /* Open command element */
178 ret = mi_lttng_writer_command_open(writer,
179 mi_lttng_element_command_metadata);
180 if (ret) {
181 ret = CMD_ERROR;
182 goto end;
183 }
184
185 /* Open output element */
186 ret = mi_lttng_writer_open_element(writer,
187 mi_lttng_element_command_output);
188 if (ret) {
189 ret = CMD_ERROR;
190 goto end;
191 }
192 }
193
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194 while ((opt = poptGetNextOpt(pc)) != -1) {
195 switch (opt) {
196 case OPT_HELP:
3b9c7d3f 197 SHOW_HELP();
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198 goto end;
199 case OPT_LIST_OPTIONS:
200 list_cmd_options(stdout, long_options);
201 goto end;
202 case OPT_LIST_COMMANDS:
203 list_commands(actions, stdout);
204 goto end;
205 default:
3b9c7d3f 206 SHOW_HELP();
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207 ret = CMD_UNDEFINED;
208 goto end;
209 }
210 }
211
212 if (!opt_session_name) {
213 session_name = get_session_name();
214 if (session_name == NULL) {
215 ret = CMD_ERROR;
216 goto end;
217 }
218 } else {
219 session_name = opt_session_name;
220 }
221
222 command_ret = handle_command(poptGetArgs(pc));
223 if (command_ret) {
224 switch (-command_ret) {
225 default:
226 ERR("%s", lttng_strerror(command_ret));
54897b57 227 success = 0;
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228 break;
229 }
230 }
231
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232 if (lttng_opt_mi) {
233 /* Close output element */
234 ret = mi_lttng_writer_close_element(writer);
235 if (ret) {
236 ret = CMD_ERROR;
237 goto end;
238 }
239
240 /* Success ? */
241 ret = mi_lttng_writer_write_element_bool(writer,
242 mi_lttng_element_command_success, success);
243 if (ret) {
244 ret = CMD_ERROR;
245 goto end;
246 }
247
248 /* Command element close */
249 ret = mi_lttng_writer_command_close(writer);
250 if (ret) {
251 ret = CMD_ERROR;
252 goto end;
253 }
254 }
255
93ec662e 256end:
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257 /* Mi clean-up */
258 if (writer && mi_lttng_writer_destroy(writer)) {
259 /* Preserve original error code */
260 ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL;
261 }
262
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263 if (!opt_session_name) {
264 free(session_name);
265 }
266
267 /* Overwrite ret if an error occurred during handle_command() */
268 ret = command_ret ? command_ret : ret;
269
270 poptFreeContext(pc);
271 return ret;
272}
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