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 = strdup(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
 105                 if (have_name) {
 106                         ret = asprintf(&traces_path, "%s/" DEFAULT_TRACE_DIR_NAME
 107                                         "/%s-%s", alloc_path, session_name, datetime);
 108                 } else {
 109                         ret = asprintf(&traces_path, "%s/" DEFAULT_TRACE_DIR_NAME
 110                                         "/%s", alloc_path, session_name);
 111                 }
 112
 113                 if (ret < 0) {
 114                         perror("asprintf trace dir name");
 115                         goto error;
 116                 }
 117         } else {
 118                 traces_path = expand_full_path(opt_output_path);
 119                 if (traces_path == NULL) {
 120                         ret = CMD_ERROR;
 121                         goto error;
 122                 }
 123         }
 124
 125         ret = lttng_create_session(session_name, traces_path);
 126         if (ret < 0) {
 127                 /* Don't set ret so lttng can interpret the sessiond error. */
 128                 switch (-ret) {
 129                 case LTTCOMM_EXIST_SESS:
 130                         WARN("Session %s already exists", session_name);
 131                         break;
 132                 }
 133                 goto error;
 134         }
 135
 136         /* Init lttng session config */
 137         ret = config_init(session_name);
 138         if (ret < 0) {
 139                 ret = CMD_ERROR;
 140                 goto error;
 141         }
 142
 143         MSG("Session %s created.", session_name);
 144         MSG("Traces will be written in %s" , traces_path);
 145
 146         ret = CMD_SUCCESS;
 147
 148 error:
 149         if (opt_session_name == NULL) {
 150                 free(session_name);
 151         }
 152
 153         if (alloc_path) {
 154                 free(alloc_path);
 155         }
 156
 157         if (traces_path) {
 158                 free(traces_path);
 159         }
 160         return ret;
 161 }
 162
 163 /*
 164  *  The 'create <options>' first level command
 165  *
 166  *  Returns one of the CMD_* result constants.
 167  */
 168 int cmd_create(int argc, const char **argv)
 169 {
 170         int opt, ret = CMD_SUCCESS;
 171         static poptContext pc;
 172
 173         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 174         poptReadDefaultConfig(pc, 0);
 175
 176         while ((opt = poptGetNextOpt(pc)) != -1) {
 177                 switch (opt) {
 178                 case OPT_HELP:
 179                         usage(stdout);
 180                         goto end;
 181                 case OPT_LIST_OPTIONS:
 182                         list_cmd_options(stdout, long_options);
 183                         goto end;
 184                 default:
 185                         usage(stderr);
 186                         ret = CMD_UNDEFINED;
 187                         goto end;
 188                 }
 189         }
 190
 191         opt_session_name = (char*) poptGetArg(pc);
 192
 193         ret = create_session();
 194
 195 end:
 196         poptFreeContext(pc);
 197         return ret;
 198 }