8052826a245296b0d2d9c310165385a11c5f6ad9
[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
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; only version 2
7 * of the License.
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
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18
19 #define _GNU_SOURCE
20 #include <popt.h>
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <string.h>
24 #include <sys/stat.h>
25 #include <sys/types.h>
26 #include <time.h>
27 #include <unistd.h>
28
29 #include "../command.h"
30 #include "../utils.h"
31
32 static char *opt_output_path;
33 static char *opt_session_name;
34
35 enum {
36 OPT_HELP = 1,
37 OPT_LIST_OPTIONS,
38 };
39
40 static struct poptOption long_options[] = {
41 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
42 {"help", 'h', POPT_ARG_NONE, NULL, OPT_HELP, NULL, NULL},
43 {"output", 'o', POPT_ARG_STRING, &opt_output_path, 0, NULL, NULL},
44 {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
45 {0, 0, 0, 0, 0, 0, 0}
46 };
47
48 /*
49 * usage
50 */
51 static void usage(FILE *ofp)
52 {
53 fprintf(ofp, "usage: lttng create [options] [NAME]\n");
54 fprintf(ofp, "\n");
55 fprintf(ofp, " The default NAME is 'auto-yyyymmdd-hhmmss'\n");
56 fprintf(ofp, " -h, --help Show this help\n");
57 fprintf(ofp, " --list-options Simple listing of options\n");
58 fprintf(ofp, " -o, --output PATH Specify output path for traces\n");
59 fprintf(ofp, "\n");
60 }
61
62 /*
63 * Create a tracing session.
64 * If no name is specified, a default name is generated.
65 *
66 * Returns one of the CMD_* result constants.
67 */
68 static int create_session()
69 {
70 int ret, have_name = 0;
71 char datetime[16];
72 char *session_name, *traces_path = NULL, *alloc_path = NULL;
73 time_t rawtime;
74 struct tm *timeinfo;
75
76 /* Get date and time for automatic session name/path */
77 time(&rawtime);
78 timeinfo = localtime(&rawtime);
79 strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
80
81 /* Auto session name creation */
82 if (opt_session_name == NULL) {
83 ret = asprintf(&session_name, "auto-%s", datetime);
84 if (ret < 0) {
85 perror("asprintf session name");
86 goto error;
87 }
88 DBG("Auto session name set to %s", session_name);
89 } else {
90 session_name = opt_session_name;
91 have_name = 1;
92 }
93
94 /* Auto output path */
95 if (opt_output_path == NULL) {
96 alloc_path = strdup(config_get_default_path());
97 if (alloc_path == NULL) {
98 ERR("Home path not found.\n \
99 Please specify an output path using -o, --output PATH");
100 ret = CMD_FATAL;
101 goto error;
102 }
103
104 if (have_name) {
105 ret = asprintf(&traces_path, "%s/" DEFAULT_TRACE_DIR_NAME
106 "/%s-%s", alloc_path, session_name, datetime);
107 } else {
108 ret = asprintf(&traces_path, "%s/" DEFAULT_TRACE_DIR_NAME
109 "/%s", alloc_path, session_name);
110 }
111
112 if (ret < 0) {
113 perror("asprintf trace dir name");
114 goto error;
115 }
116 } else {
117 traces_path = opt_output_path;
118 }
119
120 ret = lttng_create_session(session_name, traces_path);
121 if (ret < 0) {
122 /* Don't set ret so lttng can interpret the sessiond error. */
123 goto error;
124 }
125
126 /* Init lttng session config */
127 ret = config_init(session_name);
128 if (ret < 0) {
129 ret = CMD_ERROR;
130 goto error;
131 }
132
133 MSG("Session %s created.", session_name);
134 MSG("Traces will be written in %s" , traces_path);
135
136 ret = CMD_SUCCESS;
137
138 error:
139 if (opt_session_name == NULL) {
140 free(session_name);
141 }
142
143 if (alloc_path) {
144 free(alloc_path);
145 }
146
147 if (traces_path) {
148 free(traces_path);
149 }
150 return ret;
151 }
152
153 /*
154 * The 'create <options>' first level command
155 *
156 * Returns one of the CMD_* result constants.
157 */
158 int cmd_create(int argc, const char **argv)
159 {
160 int opt, ret = CMD_SUCCESS;
161 static poptContext pc;
162
163 pc = poptGetContext(NULL, argc, argv, long_options, 0);
164 poptReadDefaultConfig(pc, 0);
165
166 while ((opt = poptGetNextOpt(pc)) != -1) {
167 switch (opt) {
168 case OPT_HELP:
169 usage(stdout);
170 goto end;
171 case OPT_LIST_OPTIONS:
172 list_cmd_options(stdout, long_options);
173 goto end;
174 default:
175 usage(stderr);
176 ret = CMD_UNDEFINED;
177 goto end;
178 }
179 }
180
181 opt_session_name = (char*) poptGetArg(pc);
182
183 ret = create_session();
184
185 end:
186 poptFreeContext(pc);
187 return ret;
188 }
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