src/bin/lttng/commands/load.c

   1 /*
   2  * Copyright (C) 2014 Jérémie Galarneau <jeremie.galarneau@efficios.com>
   3  *
   4  * SPDX-License-Identifier: GPL-2.0-only
   5  *
   6  */
   7
   8 #define _LGPL_SOURCE
   9 #include <inttypes.h>
  10 #include <popt.h>
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <assert.h>
  15
  16 #include <common/mi-lttng.h>
  17 #include <common/config/session-config.h>
  18 #include <lttng/lttng.h>
  19
  20 #include "../command.h"
  21
  22 static char *opt_input_path;
  23 static char *opt_override_url;
  24 static char *opt_override_session_name;
  25 static int opt_force;
  26 static int opt_load_all;
  27
  28 static const char *session_name;
  29
  30 #ifdef LTTNG_EMBED_HELP
  31 static const char help_msg[] =
  32 #include <lttng-load.1.h>
  33 ;
  34 #endif
  35
  36 enum {
  37         OPT_HELP = 1,
  38         OPT_ALL,
  39         OPT_FORCE,
  40         OPT_LIST_OPTIONS,
  41 };
  42
  43 static struct mi_writer *writer;
  44
  45 static struct poptOption load_opts[] = {
  46         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  47         {"help",          'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
  48         {"all",           'a', POPT_ARG_NONE, 0, OPT_ALL, 0, 0},
  49         {"input-path",    'i', POPT_ARG_STRING, &opt_input_path, 0, 0, 0},
  50         {"force",         'f', POPT_ARG_NONE, 0, OPT_FORCE, 0, 0},
  51         {"override-url",    0, POPT_ARG_STRING, &opt_override_url, 0, 0, 0},
  52         {"override-name",   0, POPT_ARG_STRING, &opt_override_session_name, 0, 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         /* Print override elements */
 116         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_load_overrides);
 117         if (ret) {
 118                 goto end;
 119         }
 120
 121         /* Session name override element */
 122         if (opt_override_session_name) {
 123                 ret = mi_lttng_writer_write_element_string(writer,
 124                                 config_element_name, opt_override_session_name);
 125                 if (ret) {
 126                         goto end;
 127                 }
 128         }
 129
 130         /* Session url override element */
 131         if (opt_override_url) {
 132                 ret = mi_lttng_writer_write_element_string(writer,
 133                                 mi_lttng_element_load_override_url,
 134                                 opt_override_url);
 135                 if (ret) {
 136                         goto end;
 137                 }
 138         }
 139
 140         /* Close override and load element */
 141         ret = mi_lttng_close_multi_element(writer, 2);
 142 end:
 143         return ret;
 144 }
 145
 146 /*
 147  * The 'load <options>' first level command
 148  */
 149 int cmd_load(int argc, const char **argv)
 150 {
 151         int ret, success;
 152         int opt;
 153         poptContext pc;
 154         struct lttng_load_session_attr *session_attr = NULL;
 155         char *input_path = NULL;
 156         const char *leftover = NULL;
 157
 158         pc = poptGetContext(NULL, argc, argv, load_opts, 0);
 159         poptReadDefaultConfig(pc, 0);
 160
 161         while ((opt = poptGetNextOpt(pc)) != -1) {
 162                 switch (opt) {
 163                 case OPT_HELP:
 164                         SHOW_HELP();
 165                         ret = CMD_SUCCESS;
 166                         goto end;
 167                 case OPT_ALL:
 168                         opt_load_all = 1;
 169                         break;
 170                 case OPT_LIST_OPTIONS:
 171                         list_cmd_options(stdout, load_opts);
 172                         ret = CMD_SUCCESS;
 173                         goto end;
 174                 case OPT_FORCE:
 175                         opt_force = 1;
 176                         break;
 177                 default:
 178                         ret = CMD_UNDEFINED;
 179                         goto end;
 180                 }
 181         }
 182
 183         ret = lttng_session_daemon_alive();
 184         if (!ret) {
 185                 ERR("No session daemon is available");
 186                 ret = CMD_ERROR;
 187                 goto end;
 188         }
 189
 190         if (!opt_load_all) {
 191                 session_name = poptGetArg(pc);
 192                 if (session_name) {
 193                         DBG2("Loading session name: %s", session_name);
 194                 } else {
 195                         /* Default to load_all */
 196                         opt_load_all = 1;
 197                 }
 198         }
 199
 200         leftover = poptGetArg(pc);
 201         if (leftover) {
 202                 ERR("Unknown argument: %s", leftover);
 203                 ret = CMD_ERROR;
 204                 goto end;
 205         }
 206
 207         /* Mi check */
 208         if (lttng_opt_mi) {
 209                 writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
 210                 if (!writer) {
 211                         ret = CMD_ERROR;
 212                         goto end;
 213                 }
 214
 215                 /* Open command element */
 216                 ret = mi_lttng_writer_command_open(writer,
 217                                 mi_lttng_element_command_load);
 218                 if (ret) {
 219                         ret = CMD_ERROR;
 220                         goto end;
 221                 }
 222
 223                 /* Open output element */
 224                 ret = mi_lttng_writer_open_element(writer,
 225                                 mi_lttng_element_command_output);
 226                 if (ret) {
 227                         ret = CMD_ERROR;
 228                         goto end;
 229                 }
 230         }
 231
 232         /* Prepare load attributes */
 233         session_attr = lttng_load_session_attr_create();
 234         if (!session_attr) {
 235                 ERR("Failed to create load session attributes");
 236                 ret = CMD_ERROR;
 237                 goto end;
 238         }
 239
 240         /*
 241          * Set the input url
 242          * lttng_load_session_attr_set_input_url only suppports absolute path.
 243          * Use realpath to resolve any relative path.
 244          * */
 245         if (opt_input_path) {
 246                 input_path = realpath(opt_input_path, NULL);
 247                 if (!input_path) {
 248                         PERROR("Invalid input path");
 249                         ret = CMD_ERROR;
 250                         goto end;
 251                 }
 252         } else {
 253                 input_path = NULL;
 254         }
 255
 256         ret = lttng_load_session_attr_set_input_url(session_attr,
 257                         input_path);
 258         if (ret) {
 259                 ERR("Invalid input path");
 260                 ret = CMD_ERROR;
 261                 goto end;
 262         }
 263
 264         /* Set the session name. NULL means all sessions should be loaded */
 265         ret = lttng_load_session_attr_set_session_name(session_attr,
 266                         session_name);
 267         if (ret) {
 268                 ERR("Invalid session name");
 269                 ret = CMD_ERROR;
 270                 goto end;
 271         }
 272
 273         /* Set the overwrite attribute */
 274         ret = lttng_load_session_attr_set_overwrite(session_attr, opt_force);
 275         if (ret) {
 276                 ERR("Force argument could not be applied");
 277                 ret = CMD_ERROR;
 278                 goto end;
 279         }
 280
 281         /* Set the overrides attributes if any */
 282         if (opt_override_url) {
 283                 ret = lttng_load_session_attr_set_override_url(session_attr,
 284                                 opt_override_url);
 285                 if (ret) {
 286                         ERR("Url override is invalid");
 287                         goto end;
 288                 }
 289         }
 290
 291         if (opt_override_session_name) {
 292                 if (opt_load_all) {
 293                         ERR("Options --all and --override-name cannot be used simultaneously");
 294                         ret = CMD_ERROR;
 295                         goto end;
 296                 }
 297                 ret = lttng_load_session_attr_set_override_session_name(session_attr,
 298                                 opt_override_session_name);
 299                 if (ret) {
 300                         ERR("Failed to set session name override");
 301                         ret = CMD_ERROR;
 302                         goto end;
 303                 }
 304         }
 305
 306         ret = lttng_load_session(session_attr);
 307         if (ret) {
 308                 ERR("%s", lttng_strerror(ret));
 309                 success = 0;
 310                 ret = CMD_ERROR;
 311         } else {
 312                 if (opt_load_all) {
 313                         MSG("All sessions have been loaded successfully");
 314                 } else if (session_name) {
 315                         ret = config_init((char *) session_name);
 316                         if (ret < 0) {
 317                                 WARN("Could not set %s as the default session",
 318                                                 session_name);
 319                         }
 320                         MSG("Session %s has been loaded successfully", session_name);
 321                 } else {
 322                         MSG("Session has been loaded successfully");
 323                 }
 324
 325                 if (opt_override_session_name) {
 326                         MSG("Session name overridden with %s",
 327                                         opt_override_session_name);
 328                 }
 329
 330                 if (opt_override_url) {
 331                         MSG("Session output url overridden with %s", opt_override_url);
 332                 }
 333                 success = 1;
 334                 ret = CMD_SUCCESS;
 335         }
 336
 337         /* Mi Printing and closing */
 338         if (lttng_opt_mi) {
 339                 /* Mi print */
 340                 ret = mi_load_print(session_name);
 341                 if (ret) {
 342                         ret = CMD_ERROR;
 343                         goto end;
 344                 }
 345
 346                 /* Close  output element */
 347                 ret = mi_lttng_writer_close_element(writer);
 348                 if (ret) {
 349                         ret = CMD_ERROR;
 350                         goto end;
 351                 }
 352
 353                 /* Success ? */
 354                 ret = mi_lttng_writer_write_element_bool(writer,
 355                                 mi_lttng_element_command_success, success);
 356                 if (ret) {
 357                         ret = CMD_ERROR;
 358                         goto end;
 359                 }
 360
 361                 /* Command element close */
 362                 ret = mi_lttng_writer_command_close(writer);
 363                 if (ret) {
 364                         ret = CMD_ERROR;
 365                         goto end;
 366                 }
 367         }
 368 end:
 369         if (writer && mi_lttng_writer_destroy(writer)) {
 370                 ERR("Failed to destroy mi lttng writer");
 371         }
 372
 373         lttng_load_session_attr_destroy(session_attr);
 374         free(input_path);
 375         poptFreeContext(pc);
 376         return ret;
 377 }