src/bin/lttng/commands/load.c

   1 /*
   2  * Copyright (C) 2014 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
   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 _LGPL_SOURCE
  19 #include <inttypes.h>
  20 #include <popt.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <assert.h>
  25
  26 #include <common/mi-lttng.h>
  27 #include <common/config/session-config.h>
  28 #include <lttng/load.h>
  29
  30 #include "../command.h"
  31
  32 static char *opt_input_path;
  33 static int opt_force;
  34 static int opt_load_all;
  35
  36 static const char *session_name;
  37
  38 enum {
  39         OPT_HELP = 1,
  40         OPT_ALL,
  41         OPT_FORCE,
  42         OPT_LIST_OPTIONS,
  43 };
  44
  45 static struct mi_writer *writer;
  46
  47 static struct poptOption load_opts[] = {
  48         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  49         {"help",        'h',  POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
  50         {"all",         'a',  POPT_ARG_NONE, 0, OPT_ALL, 0, 0},
  51         {"input-path",  'i',  POPT_ARG_STRING, &opt_input_path, 0, 0, 0},
  52         {"force",       'f',  POPT_ARG_NONE, 0, OPT_FORCE, 0, 0},
  53         {"list-options",  0,  POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
  54         {0, 0, 0, 0, 0, 0, 0}
  55 };
  56
  57 static int mi_partial_session(const char *session_name)
  58 {
  59         int ret;
  60         assert(writer);
  61         assert(session_name);
  62
  63         /* Open session element */
  64         ret = mi_lttng_writer_open_element(writer, config_element_session);
  65         if (ret) {
  66                 goto end;
  67         }
  68
  69         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
  70                         session_name);
  71         if (ret) {
  72                 goto end;
  73         }
  74
  75         /* Closing session element */
  76         ret = mi_lttng_writer_close_element(writer);
  77 end:
  78         return ret;
  79 }
  80
  81 /*
  82  * Mi print of load command
  83  */
  84 static int mi_load_print(const char *session_name)
  85 {
  86         int ret;
  87         assert(writer);
  88
  89         if (opt_load_all) {
  90                 /* We use a wildcard to represent all sessions */
  91                 session_name = "*";
  92         }
  93
  94         /* Print load element */
  95         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_load);
  96         if (ret) {
  97                 goto end;
  98         }
  99
 100         /* Print session element */
 101         ret = mi_partial_session(session_name);
 102         if (ret) {
 103                 goto end;
 104         }
 105
 106         /* Path element */
 107         if (opt_input_path) {
 108                 ret = mi_lttng_writer_write_element_string(writer, config_element_path,
 109                                 opt_input_path);
 110                 if (ret) {
 111                         goto end;
 112                 }
 113         }
 114
 115         /* Close load element */
 116         ret = mi_lttng_writer_close_element(writer);
 117
 118 end:
 119         return ret;
 120 }
 121
 122 /*
 123  * The 'load <options>' first level command
 124  */
 125 int cmd_load(int argc, const char **argv)
 126 {
 127         int ret, success;
 128         int opt;
 129         poptContext pc;
 130         struct lttng_load_session_attr *session_attr = NULL;
 131         char *input_path = NULL;
 132
 133         pc = poptGetContext(NULL, argc, argv, load_opts, 0);
 134         poptReadDefaultConfig(pc, 0);
 135
 136         while ((opt = poptGetNextOpt(pc)) != -1) {
 137                 switch (opt) {
 138                 case OPT_HELP:
 139                         SHOW_HELP();
 140                         ret = CMD_SUCCESS;
 141                         goto end;
 142                 case OPT_ALL:
 143                         opt_load_all = 1;
 144                         break;
 145                 case OPT_LIST_OPTIONS:
 146                         list_cmd_options(stdout, load_opts);
 147                         ret = CMD_SUCCESS;
 148                         goto end;
 149                 case OPT_FORCE:
 150                         opt_force = 1;
 151                         break;
 152                 default:
 153                         ret = CMD_UNDEFINED;
 154                         goto end;
 155                 }
 156         }
 157
 158         ret = lttng_session_daemon_alive();
 159         if (!ret) {
 160                 ERR("No session daemon is available");
 161                 ret = CMD_ERROR;
 162                 goto end;
 163         }
 164
 165         if (!opt_load_all) {
 166                 session_name = poptGetArg(pc);
 167                 if (session_name) {
 168                         DBG2("Loading session name: %s", session_name);
 169                 } else {
 170                         /* Default to load_all */
 171                         opt_load_all = 1;
 172                 }
 173         }
 174
 175         /* Mi check */
 176         if (lttng_opt_mi) {
 177                 writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
 178                 if (!writer) {
 179                         ret = CMD_ERROR;
 180                         goto end;
 181                 }
 182
 183                 /* Open command element */
 184                 ret = mi_lttng_writer_command_open(writer,
 185                                 mi_lttng_element_command_load);
 186                 if (ret) {
 187                         ret = CMD_ERROR;
 188                         goto end;
 189                 }
 190
 191                 /* Open output element */
 192                 ret = mi_lttng_writer_open_element(writer,
 193                                 mi_lttng_element_command_output);
 194                 if (ret) {
 195                         ret = CMD_ERROR;
 196                         goto end;
 197                 }
 198         }
 199
 200         /* Prepare load attributes */
 201         session_attr = lttng_load_session_attr_create();
 202         if (!session_attr) {
 203                 ERR("Failed to create load session attributes");
 204                 ret = CMD_ERROR;
 205                 goto end;
 206         }
 207
 208         /*
 209          * Set the input url
 210          * lttng_load_session_attr_set_input_url only suppports absolute path.
 211          * Use realpath to resolve any relative path.
 212          * */
 213         if (opt_input_path) {
 214                 input_path = realpath(opt_input_path, NULL);
 215                 if (!input_path) {
 216                         PERROR("Invalid input path");
 217                         ret = CMD_ERROR;
 218                         goto end;
 219                 }
 220         } else {
 221                 input_path = NULL;
 222         }
 223
 224         ret = lttng_load_session_attr_set_input_url(session_attr,
 225                         input_path);
 226         if (ret) {
 227                 ERR("Invalid input path");
 228                 ret = CMD_ERROR;
 229                 goto end;
 230         }
 231
 232         /* Set the session name. NULL means all sessions should be loaded */
 233         ret = lttng_load_session_attr_set_session_name(session_attr,
 234                         session_name);
 235         if (ret) {
 236                 ERR("Invalid session name");
 237                 ret = CMD_ERROR;
 238                 goto end;
 239         }
 240
 241         /* Set the overwrite attribute */
 242         ret = lttng_load_session_attr_set_overwrite(session_attr, opt_force);
 243         if (ret) {
 244                 ERR("Force argument could not be applied");
 245                 ret = CMD_ERROR;
 246                 goto end;
 247         }
 248
 249         ret = lttng_load_session(session_attr);
 250         if (ret) {
 251                 ERR("%s", lttng_strerror(ret));
 252                 success = 0;
 253                 ret = CMD_ERROR;
 254         } else {
 255                 if (opt_load_all) {
 256                         MSG("All sessions have been loaded successfully");
 257                 } else if (session_name) {
 258                         ret = config_init((char *) session_name);
 259                         if (ret < 0) {
 260                                 ret = CMD_WARNING;
 261                         }
 262                         MSG("Session %s has been loaded successfully", session_name);
 263                 } else {
 264                         MSG("Session has been loaded successfully");
 265                 }
 266                 success = 1;
 267                 ret = CMD_SUCCESS;
 268         }
 269
 270         /* Mi Printing and closing */
 271         if (lttng_opt_mi) {
 272                 /* Mi print */
 273                 ret = mi_load_print(session_name);
 274                 if (ret) {
 275                         ret = CMD_ERROR;
 276                         goto end;
 277                 }
 278
 279                 /* Close  output element */
 280                 ret = mi_lttng_writer_close_element(writer);
 281                 if (ret) {
 282                         ret = CMD_ERROR;
 283                         goto end;
 284                 }
 285
 286                 /* Success ? */
 287                 ret = mi_lttng_writer_write_element_bool(writer,
 288                                 mi_lttng_element_command_success, success);
 289                 if (ret) {
 290                         ret = CMD_ERROR;
 291                         goto end;
 292                 }
 293
 294                 /* Command element close */
 295                 ret = mi_lttng_writer_command_close(writer);
 296                 if (ret) {
 297                         ret = CMD_ERROR;
 298                         goto end;
 299                 }
 300         }
 301 end:
 302         if (writer && mi_lttng_writer_destroy(writer)) {
 303                 ERR("Failed to destroy mi lttng writer");
 304         }
 305
 306         lttng_load_session_attr_destroy(session_attr);
 307         free(input_path);
 308         poptFreeContext(pc);
 309         return ret;
 310 }