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;
  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");
  84                 if (ret < 0) {
  85                         perror("asprintf session name");
  86                         ret = CMD_ERROR;
  87                         goto error;
  88                 }
  89                 DBG("Auto session name set to %s", session_name);
  90         } else {
  91                 session_name = opt_session_name;
  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\n");
 100                         ret = CMD_FATAL;
 101                         goto error;
 102                 }
 103
 104                 ret = asprintf(&traces_path, "%s/" DEFAULT_TRACE_DIR_NAME "/%s-%s",
 105                                 alloc_path, session_name, datetime);
 106                 if (ret < 0) {
 107                         perror("asprintf trace dir name");
 108                         ret = CMD_ERROR;
 109                         goto error;
 110                 }
 111         } else {
 112                 traces_path = opt_output_path;
 113         }
 114
 115         ret = lttng_create_session(session_name, traces_path);
 116         if (ret < 0) {
 117                 /* Don't set ret so lttng can interpret the sessiond error. */
 118                 goto error;
 119         }
 120
 121         /* Init lttng session config */
 122         ret = config_init(session_name);
 123         if (ret < 0) {
 124                 ret = CMD_ERROR;
 125                 goto error;
 126         }
 127
 128         MSG("Session %s created.", session_name);
 129         MSG("Traces will be written in %s" , traces_path);
 130
 131         ret = CMD_SUCCESS;
 132
 133 error:
 134         if (opt_session_name == NULL) {
 135                 free(session_name);
 136         }
 137
 138         if (alloc_path) {
 139                 free(alloc_path);
 140         }
 141
 142         if (traces_path) {
 143                 free(traces_path);
 144         }
 145         return ret;
 146 }
 147
 148 /*
 149  *  The 'create <options>' first level command
 150  *
 151  *  Returns one of the CMD_* result constants.
 152  */
 153 int cmd_create(int argc, const char **argv)
 154 {
 155         int opt, ret = CMD_SUCCESS;
 156         static poptContext pc;
 157
 158         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 159         poptReadDefaultConfig(pc, 0);
 160
 161         while ((opt = poptGetNextOpt(pc)) != -1) {
 162                 switch (opt) {
 163                 case OPT_HELP:
 164                         usage(stdout);
 165                         goto end;
 166                 case OPT_LIST_OPTIONS:
 167                         list_cmd_options(stdout, long_options);
 168                         goto end;
 169                 default:
 170                         usage(stderr);
 171                         ret = CMD_UNDEFINED;
 172                         goto end;
 173                 }
 174         }
 175
 176         opt_session_name = (char*) poptGetArg(pc);
 177
 178         ret = create_session();
 179
 180 end:
 181         poptFreeContext(pc);
 182         return ret;
 183 }