Fix: unchecked pointer from getenv() for lttng create
[lttng-tools.git] / src / bin / lttng / commands / create.c
1 /*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
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 _GNU_SOURCE
19 #include <popt.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <string.h>
23 #include <sys/stat.h>
24 #include <sys/types.h>
25 #include <time.h>
26 #include <unistd.h>
27
28 #include "../command.h"
29 #include "../utils.h"
30
31 #include <common/sessiond-comm/sessiond-comm.h>
32
33 static char *opt_output_path;
34 static char *opt_session_name;
35
36 enum {
37 OPT_HELP = 1,
38 OPT_LIST_OPTIONS,
39 };
40
41 static struct poptOption long_options[] = {
42 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
43 {"help", 'h', POPT_ARG_NONE, NULL, OPT_HELP, NULL, NULL},
44 {"output", 'o', POPT_ARG_STRING, &opt_output_path, 0, NULL, NULL},
45 {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
46 {0, 0, 0, 0, 0, 0, 0}
47 };
48
49 /*
50 * usage
51 */
52 static void usage(FILE *ofp)
53 {
54 fprintf(ofp, "usage: lttng create [options] [NAME]\n");
55 fprintf(ofp, "\n");
56 fprintf(ofp, " The default NAME is 'auto-yyyymmdd-hhmmss'\n");
57 fprintf(ofp, " -h, --help Show this help\n");
58 fprintf(ofp, " --list-options Simple listing of options\n");
59 fprintf(ofp, " -o, --output PATH Specify output path for traces\n");
60 fprintf(ofp, "\n");
61 }
62
63 /*
64 * Create a tracing session.
65 * If no name is specified, a default name is generated.
66 *
67 * Returns one of the CMD_* result constants.
68 */
69 static int create_session()
70 {
71 int ret, have_name = 0;
72 char datetime[16];
73 char *session_name, *traces_path = NULL, *alloc_path = NULL;
74 time_t rawtime;
75 struct tm *timeinfo;
76
77 /* Get date and time for automatic session name/path */
78 time(&rawtime);
79 timeinfo = localtime(&rawtime);
80 strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
81
82 /* Auto session name creation */
83 if (opt_session_name == NULL) {
84 ret = asprintf(&session_name, "auto-%s", datetime);
85 if (ret < 0) {
86 perror("asprintf session name");
87 goto error;
88 }
89 DBG("Auto session name set to %s", session_name);
90 } else {
91 session_name = opt_session_name;
92 have_name = 1;
93 }
94
95 /* Auto output path */
96 if (opt_output_path == NULL) {
97 alloc_path = config_get_default_path();
98 if (alloc_path == NULL) {
99 ERR("HOME path not found.\n \
100 Please specify an output path using -o, --output PATH");
101 ret = CMD_FATAL;
102 goto error;
103 }
104 alloc_path = strdup(alloc_path);
105
106 if (have_name) {
107 ret = asprintf(&traces_path, "%s/" DEFAULT_TRACE_DIR_NAME
108 "/%s-%s", alloc_path, session_name, datetime);
109 } else {
110 ret = asprintf(&traces_path, "%s/" DEFAULT_TRACE_DIR_NAME
111 "/%s", alloc_path, session_name);
112 }
113
114 if (ret < 0) {
115 perror("asprintf trace dir name");
116 goto error;
117 }
118 } else {
119 traces_path = expand_full_path(opt_output_path);
120 if (traces_path == NULL) {
121 ret = CMD_ERROR;
122 goto error;
123 }
124 }
125
126 ret = lttng_create_session(session_name, traces_path);
127 if (ret < 0) {
128 /* Don't set ret so lttng can interpret the sessiond error. */
129 switch (-ret) {
130 case LTTCOMM_EXIST_SESS:
131 WARN("Session %s already exists", session_name);
132 break;
133 }
134 goto error;
135 }
136
137 /* Init lttng session config */
138 ret = config_init(session_name);
139 if (ret < 0) {
140 ret = CMD_ERROR;
141 goto error;
142 }
143
144 MSG("Session %s created.", session_name);
145 MSG("Traces will be written in %s" , traces_path);
146
147 ret = CMD_SUCCESS;
148
149 error:
150 if (opt_session_name == NULL) {
151 free(session_name);
152 }
153
154 if (alloc_path) {
155 free(alloc_path);
156 }
157
158 if (traces_path) {
159 free(traces_path);
160 }
161 return ret;
162 }
163
164 /*
165 * The 'create <options>' first level command
166 *
167 * Returns one of the CMD_* result constants.
168 */
169 int cmd_create(int argc, const char **argv)
170 {
171 int opt, ret = CMD_SUCCESS;
172 static poptContext pc;
173
174 pc = poptGetContext(NULL, argc, argv, long_options, 0);
175 poptReadDefaultConfig(pc, 0);
176
177 while ((opt = poptGetNextOpt(pc)) != -1) {
178 switch (opt) {
179 case OPT_HELP:
180 usage(stdout);
181 goto end;
182 case OPT_LIST_OPTIONS:
183 list_cmd_options(stdout, long_options);
184 goto end;
185 default:
186 usage(stderr);
187 ret = CMD_UNDEFINED;
188 goto end;
189 }
190 }
191
192 opt_session_name = (char*) poptGetArg(pc);
193
194 ret = create_session();
195
196 end:
197 poptFreeContext(pc);
198 return ret;
199 }
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