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 }