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
  31 static char *opt_output_path;
  32 static char *opt_session_name;
  33
  34 enum {
  35         OPT_HELP = 1,
  36 };
  37
  38 static struct poptOption long_options[] = {
  39         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  40         {"help",      'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
  41         {"output",    'o', POPT_ARG_STRING, &opt_output_path, 0, 0, 0},
  42         {0, 0, 0, 0, 0, 0, 0}
  43 };
  44
  45 /*
  46  * usage
  47  */
  48 static void usage(FILE *ofp)
  49 {
  50         fprintf(ofp, "usage: lttng create [options] [NAME]\n");
  51         fprintf(ofp, "\n");
  52         fprintf(ofp, "  -h, --help           Show this help\n");
  53         fprintf(ofp, "  -o, --output PATH    Specify output path for traces\n");
  54         fprintf(ofp, "\n");
  55 }
  56
  57 /*
  58  *  create_session
  59  *
  60  *  Create a tracing session. If no name specified, a default name will be
  61  *  generated.
  62  */
  63 static int create_session()
  64 {
  65         int ret, have_name = 0;
  66         char datetime[16];
  67         char *session_name, *traces_path = NULL, *alloc_path = NULL;
  68         time_t rawtime;
  69         struct tm *timeinfo;
  70
  71         /* Get date and time for automatic session name/path */
  72         time(&rawtime);
  73         timeinfo = localtime(&rawtime);
  74         strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
  75
  76         /* Auto session name creation */
  77         if (opt_session_name == NULL) {
  78                 ret = asprintf(&session_name, "auto-%s", datetime);
  79                 if (ret < 0) {
  80                         perror("asprintf session name");
  81                         goto error;
  82                 }
  83                 DBG("Auto session name set to %s", session_name);
  84         } else {
  85                 session_name = opt_session_name;
  86                 have_name = 1;
  87         }
  88
  89         /* Auto output path */
  90         if (opt_output_path == NULL) {
  91                 alloc_path = strdup(config_get_default_path());
  92                 if (alloc_path == NULL) {
  93                         ERR("Home path not found.\n \
  94                                  Please specify an output path using -o, --output PATH");
  95                         ret = CMD_FATAL;
  96                         goto error;
  97                 }
  98
  99                 if (have_name) {
 100                         ret = asprintf(&traces_path, "%s/" LTTNG_DEFAULT_TRACE_DIR_NAME
 101                                         "/%s-%s", alloc_path, session_name, datetime);
 102                 } else {
 103                         ret = asprintf(&traces_path, "%s/" LTTNG_DEFAULT_TRACE_DIR_NAME
 104                                         "/%s", alloc_path, session_name);
 105                 }
 106
 107                 if (ret < 0) {
 108                         perror("asprintf trace dir name");
 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                 goto error;
 118         }
 119
 120         /* Init lttng session config */
 121         ret = config_init(session_name);
 122         if (ret < 0) {
 123                 if (ret == -1) {
 124                         ret = CMD_ERROR;
 125                 }
 126                 goto error;
 127         }
 128
 129         MSG("Session %s created.", session_name);
 130         MSG("Traces will be written in %s" , traces_path);
 131
 132         ret = CMD_SUCCESS;
 133
 134 error:
 135         if (alloc_path) {
 136                 free(alloc_path);
 137         }
 138
 139         if (traces_path) {
 140                 free(traces_path);
 141         }
 142         return ret;
 143 }
 144
 145 /*
 146  *  cmd_list
 147  *
 148  *  The 'list <options>' first level command
 149  */
 150 int cmd_create(int argc, const char **argv)
 151 {
 152         int opt, ret = CMD_SUCCESS;
 153         static poptContext pc;
 154
 155         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 156         poptReadDefaultConfig(pc, 0);
 157
 158         while ((opt = poptGetNextOpt(pc)) != -1) {
 159                 switch (opt) {
 160                 case OPT_HELP:
 161                         usage(stderr);
 162                         goto end;
 163                 default:
 164                         usage(stderr);
 165                         ret = CMD_UNDEFINED;
 166                         goto end;
 167                 }
 168         }
 169
 170         opt_session_name = (char*) poptGetArg(pc);
 171
 172         ret = create_session();
 173
 174 end:
 175         return ret;
 176 }