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
  29 #include "../command.h"
  30
  31 static char *opt_input_path;
  32 static int opt_force;
  33 static int opt_load_all;
  34
  35 static const char *session_name;
  36
  37 enum {
  38         OPT_HELP = 1,
  39         OPT_ALL,
  40         OPT_FORCE,
  41         OPT_LIST_OPTIONS,
  42 };
  43
  44 static struct mi_writer *writer;
  45
  46 static struct poptOption load_opts[] = {
  47         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  48         {"help",        'h',  POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
  49         {"all",         'a',  POPT_ARG_NONE, 0, OPT_ALL, 0, 0},
  50         {"input-path",  'i',  POPT_ARG_STRING, &opt_input_path, 0, 0, 0},
  51         {"force",       'f',  POPT_ARG_NONE, 0, OPT_FORCE, 0, 0},
  52         {"list-options",  0,  POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
  53         {0, 0, 0, 0, 0, 0, 0}
  54 };
  55
  56 /*
  57  * usage
  58  */
  59 static void usage(FILE *ofp)
  60 {
  61         fprintf(ofp, "usage: lttng load [OPTIONS] [SESSION]\n");
  62         fprintf(ofp, "\n");
  63         fprintf(ofp, "Options:\n");
  64         fprintf(ofp, "  -h, --help               Show this help\n");
  65         fprintf(ofp, "  -a, --all                Load all sessions (default)\n");
  66         fprintf(ofp, "  -i, --input-path PATH    Input path of the session file(s).\n");
  67         fprintf(ofp, "                           If a directory, load all files in it\n");
  68         fprintf(ofp, "                           else try to load the given file.\n");
  69         fprintf(ofp, "  -f, --force              Override existing session(s).\n");
  70         fprintf(ofp, "                           This will destroy existing session(s)\n");
  71         fprintf(ofp, "                           before creating new one(s).\n");
  72 }
  73
  74 static int mi_partial_session(const char *session_name)
  75 {
  76         int ret;
  77         assert(writer);
  78         assert(session_name);
  79
  80         /* Open session element */
  81         ret = mi_lttng_writer_open_element(writer, config_element_session);
  82         if (ret) {
  83                 goto end;
  84         }
  85
  86         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
  87                         session_name);
  88         if (ret) {
  89                 goto end;
  90         }
  91
  92         /* Closing session element */
  93         ret = mi_lttng_writer_close_element(writer);
  94 end:
  95         return ret;
  96 }
  97
  98 /*
  99  * Mi print of load command
 100  */
 101 static int mi_load_print(const char *session_name)
 102 {
 103         int ret;
 104         assert(writer);
 105
 106         if (opt_load_all) {
 107                 /* We use a wildcard to represent all sessions */
 108                 session_name = "*";
 109         }
 110
 111         /* Print load element */
 112         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_load);
 113         if (ret) {
 114                 goto end;
 115         }
 116
 117         /* Print session element */
 118         ret = mi_partial_session(session_name);
 119         if (ret) {
 120                 goto end;
 121         }
 122
 123         /* Path element */
 124         if (opt_input_path) {
 125                 ret = mi_lttng_writer_write_element_string(writer, config_element_path,
 126                                 opt_input_path);
 127                 if (ret) {
 128                         goto end;
 129                 }
 130         }
 131
 132         /* Close load element */
 133         ret = mi_lttng_writer_close_element(writer);
 134
 135 end:
 136         return ret;
 137 }
 138
 139 /*
 140  * The 'load <options>' first level command
 141  */
 142 int cmd_load(int argc, const char **argv)
 143 {
 144         int ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success;
 145         int opt;
 146         poptContext pc;
 147
 148         pc = poptGetContext(NULL, argc, argv, load_opts, 0);
 149         poptReadDefaultConfig(pc, 0);
 150
 151         while ((opt = poptGetNextOpt(pc)) != -1) {
 152                 switch (opt) {
 153                 case OPT_HELP:
 154                         usage(stdout);
 155                         goto end;
 156                 case OPT_ALL:
 157                         opt_load_all = 1;
 158                         break;
 159                 case OPT_LIST_OPTIONS:
 160                         list_cmd_options(stdout, load_opts);
 161                         goto end;
 162                 case OPT_FORCE:
 163                         opt_force = 1;
 164                         break;
 165                 default:
 166                         usage(stderr);
 167                         ret = CMD_UNDEFINED;
 168                         goto end;
 169                 }
 170         }
 171
 172         if (!opt_load_all) {
 173                 session_name = poptGetArg(pc);
 174                 if (session_name) {
 175                         DBG2("Loading session name: %s", session_name);
 176                 } else {
 177                         /* Default to load_all */
 178                         opt_load_all = 1;
 179                 }
 180         }
 181
 182         /* Mi check */
 183         if (lttng_opt_mi) {
 184                 writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
 185                 if (!writer) {
 186                         ret = -LTTNG_ERR_NOMEM;
 187                         goto end;
 188                 }
 189
 190                 /* Open command element */
 191                 ret = mi_lttng_writer_command_open(writer,
 192                                 mi_lttng_element_command_load);
 193                 if (ret) {
 194                         ret = CMD_ERROR;
 195                         goto end;
 196                 }
 197
 198                 /* Open output element */
 199                 ret = mi_lttng_writer_open_element(writer,
 200                                 mi_lttng_element_command_output);
 201                 if (ret) {
 202                         ret = CMD_ERROR;
 203                         goto end;
 204                 }
 205         }
 206
 207         command_ret = config_load_session(opt_input_path, session_name, opt_force, 0);
 208         if (command_ret) {
 209                 ERR("%s", lttng_strerror(command_ret));
 210                 success = 0;
 211         } else {
 212                 if (opt_load_all) {
 213                         MSG("All sessions have been loaded successfully");
 214                 } else if (session_name) {
 215                         ret = config_init((char *)session_name);
 216                         if (ret < 0) {
 217                                 ret = CMD_WARNING;
 218                         }
 219                         MSG("Session %s has been loaded successfully", session_name);
 220                 } else {
 221                         MSG("Session has been loaded successfully");
 222                 }
 223                 success = 1;
 224         }
 225
 226         /* Mi Printing and closing */
 227         if (lttng_opt_mi) {
 228                 /* Mi print */
 229                 ret = mi_load_print(session_name);
 230                 if (ret) {
 231                         ret = CMD_ERROR;
 232                         goto end;
 233                 }
 234
 235                 /* Close  output element */
 236                 ret = mi_lttng_writer_close_element(writer);
 237                 if (ret) {
 238                         ret = CMD_ERROR;
 239                         goto end;
 240                 }
 241
 242                 /* Success ? */
 243                 ret = mi_lttng_writer_write_element_bool(writer,
 244                                 mi_lttng_element_command_success, success);
 245                 if (ret) {
 246                         ret = CMD_ERROR;
 247                         goto end;
 248                 }
 249
 250                 /* Command element close */
 251                 ret = mi_lttng_writer_command_close(writer);
 252                 if (ret) {
 253                         ret = CMD_ERROR;
 254                         goto end;
 255                 }
 256         }
 257 end:
 258         if (writer && mi_lttng_writer_destroy(writer)) {
 259                 /* Preserve original error code */
 260                 ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL;
 261         }
 262
 263         /* Overwrite ret if the was an error with the load command */
 264         ret = command_ret ? -command_ret : ret;
 265
 266         poptFreeContext(pc);
 267         return ret;
 268 }