src/bin/lttng/commands/save.c

   1 /*
   2  * Copyright (C) 2013 - 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
  28 #include "../command.h"
  29 #include <lttng/save.h>
  30
  31 static char *opt_output_path;
  32 static int opt_force;
  33 static int opt_save_all;
  34 static struct mi_writer *writer;
  35
  36 enum {
  37         OPT_HELP = 1,
  38         OPT_ALL,
  39         OPT_FORCE,
  40         OPT_LIST_OPTIONS,
  41 };
  42
  43 static struct poptOption save_opts[] = {
  44         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  45         {"help",        'h', POPT_ARG_NONE, NULL, OPT_HELP, NULL, NULL},
  46         {"all",         'a', POPT_ARG_NONE, NULL, OPT_ALL, NULL, NULL},
  47         {"output-path", 'o', POPT_ARG_STRING, &opt_output_path, 0, NULL, NULL},
  48         {"force",       'f', POPT_ARG_NONE, NULL, OPT_FORCE, NULL, NULL},
  49         {"list-options",  0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
  50         {0, 0, 0, 0, 0, 0, 0}
  51 };
  52
  53 static int mi_partial_session(const char *session_name)
  54 {
  55         int ret;
  56         assert(writer);
  57         assert(session_name);
  58
  59         /* Open session element */
  60         ret = mi_lttng_writer_open_element(writer, config_element_session);
  61         if (ret) {
  62                 goto end;
  63         }
  64
  65         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
  66                         session_name);
  67         if (ret) {
  68                 goto end;
  69         }
  70
  71         /* Closing session element */
  72         ret = mi_lttng_writer_close_element(writer);
  73 end:
  74         return ret;
  75 }
  76
  77 /*
  78  * Mi print of save command
  79  */
  80 static int mi_save_print(const char *session_name)
  81 {
  82         int ret;
  83         assert(writer);
  84
  85         if (opt_save_all) {
  86                 /* We use a wildcard to represent all sessions */
  87                 session_name = "*";
  88         }
  89
  90         /* Print save element */
  91         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_save);
  92         if (ret) {
  93                 goto end;
  94         }
  95
  96         /* Print session element */
  97         ret = mi_partial_session(session_name);
  98         if (ret) {
  99                 goto end;
 100         }
 101
 102         /* Path element */
 103         if (opt_output_path) {
 104                 ret = mi_lttng_writer_write_element_string(writer, config_element_path,
 105                                 opt_output_path);
 106                 if (ret) {
 107                         goto end;
 108                 }
 109         }
 110
 111         /* Close save element */
 112         ret = mi_lttng_writer_close_element(writer);
 113 end:
 114         return ret;
 115 }
 116
 117 /*
 118  * The 'save <options>' first level command
 119  */
 120 int cmd_save(int argc, const char **argv)
 121 {
 122         int ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success;
 123         int opt;
 124         const char *session_name = NULL;
 125         poptContext pc;
 126         struct lttng_save_session_attr *attr;
 127
 128         pc = poptGetContext(NULL, argc, argv, save_opts, 0);
 129         poptReadDefaultConfig(pc, 0);
 130
 131         while ((opt = poptGetNextOpt(pc)) != -1) {
 132                 switch (opt) {
 133                 case OPT_HELP:
 134                         SHOW_HELP();
 135                         goto end;
 136                 case OPT_ALL:
 137                         opt_save_all = 1;
 138                         break;
 139                 case OPT_FORCE:
 140                         opt_force = 1;
 141                         break;
 142                 case OPT_LIST_OPTIONS:
 143                         list_cmd_options(stdout, save_opts);
 144                         goto end;
 145                 default:
 146                         ret = CMD_UNDEFINED;
 147                         goto end;
 148                 }
 149         }
 150
 151         if (!opt_save_all) {
 152                 session_name = poptGetArg(pc);
 153                 if (session_name) {
 154                         DBG2("Session name: %s", session_name);
 155                 } else {
 156                         /* default to opt_save_all */
 157                         opt_save_all = 1;
 158                 }
 159         }
 160
 161         attr = lttng_save_session_attr_create();
 162         if (!attr) {
 163                 ret = CMD_FATAL;
 164                 goto end_destroy;
 165         }
 166
 167         if (lttng_save_session_attr_set_session_name(attr, session_name)) {
 168                 ret = CMD_ERROR;
 169                 goto end_destroy;
 170         }
 171
 172         if (lttng_save_session_attr_set_overwrite(attr, opt_force)) {
 173                 ret = CMD_ERROR;
 174                 goto end_destroy;
 175         }
 176
 177         if (lttng_save_session_attr_set_output_url(attr, opt_output_path)) {
 178                 ret = CMD_ERROR;
 179                 goto end_destroy;
 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_destroy;
 188                 }
 189
 190                 /* Open command element */
 191                 ret = mi_lttng_writer_command_open(writer,
 192                                 mi_lttng_element_command_save);
 193                 if (ret) {
 194                         ret = CMD_ERROR;
 195                         goto end_destroy;
 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_destroy;
 204                 }
 205         }
 206
 207         command_ret = lttng_save_session(attr);
 208         if (command_ret < 0) {
 209                 ERR("%s", lttng_strerror(command_ret));
 210                 success = 0;
 211         } else {
 212                 /* Inform the user of what just happened on success. */
 213                 if (session_name && opt_output_path) {
 214                         MSG("Session %s saved successfully in %s.", session_name,
 215                                         opt_output_path);
 216                 } else if (session_name && !opt_output_path) {
 217                         MSG("Session %s saved successfully.", session_name);
 218                 } else if (!session_name && opt_output_path) {
 219                         MSG("All sessions have been saved successfully in %s.",
 220                                         opt_output_path);
 221                 } else {
 222                         MSG("All sessions have been saved successfully.");
 223                 }
 224                 success = 1;
 225         }
 226
 227         /* Mi Printing and closing */
 228         if (lttng_opt_mi) {
 229                 /* Mi print */
 230                 ret = mi_save_print(session_name);
 231                 if (ret) {
 232                         ret = CMD_ERROR;
 233                         goto end_destroy;
 234                 }
 235
 236                 /* Close  output element */
 237                 ret = mi_lttng_writer_close_element(writer);
 238                 if (ret) {
 239                         ret = CMD_ERROR;
 240                         goto end_destroy;
 241                 }
 242
 243                 /* Success ? */
 244                 ret = mi_lttng_writer_write_element_bool(writer,
 245                                 mi_lttng_element_command_success, success);
 246                 if (ret) {
 247                         ret = CMD_ERROR;
 248                         goto end_destroy;
 249                 }
 250
 251                 /* Command element close */
 252                 ret = mi_lttng_writer_command_close(writer);
 253                 if (ret) {
 254                         ret = CMD_ERROR;
 255                         goto end_destroy;
 256                 }
 257         }
 258 end_destroy:
 259         lttng_save_session_attr_destroy(attr);
 260 end:
 261         /* Mi clean-up */
 262         if (writer && mi_lttng_writer_destroy(writer)) {
 263                 /* Preserve original error code */
 264                 ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL;
 265         }
 266
 267         /* Overwrite ret if command failed */
 268         ret = command_ret ? -command_ret : ret;
 269
 270         poptFreeContext(pc);
 271         return ret;
 272 }