src/bin/lttng/commands/disable_rotation.c

   1 /*
   2  * Copyright (C) 2017 - Julien Desfossez <jdesfossez@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 <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 <unistd.h>
  26 #include <inttypes.h>
  27 #include <ctype.h>
  28
  29 #include <common/sessiond-comm/sessiond-comm.h>
  30 #include <common/mi-lttng.h>
  31
  32 #include "../command.h"
  33 #include <lttng/rotation.h>
  34
  35 static char *opt_session_name;
  36 static struct mi_writer *writer;
  37
  38 enum {
  39         OPT_HELP = 1,
  40         OPT_LIST_OPTIONS,
  41         OPT_TIMER,
  42         OPT_SIZE,
  43 };
  44
  45 static struct poptOption long_options[] = {
  46         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  47         {"help",        'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
  48         {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
  49         {"session",     's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0},
  50         {"timer",        0,   POPT_ARG_NONE, 0, OPT_TIMER, 0, 0},
  51         {"size",         0,   POPT_ARG_NONE, 0, OPT_SIZE, 0, 0},
  52         {0, 0, 0, 0, 0, 0, 0}
  53 };
  54
  55 static int setup_rotate(char *session_name, uint64_t timer, uint64_t size)
  56 {
  57         int ret = 0;
  58         struct lttng_rotation_schedule_attr *attr = NULL;
  59
  60         attr = lttng_rotation_schedule_attr_create();
  61         if (!attr) {
  62                 goto error;
  63         }
  64
  65         if (lttng_opt_mi) {
  66                 /* Open rotation_schedule element */
  67                 ret = mi_lttng_writer_open_element(writer,
  68                                 config_element_rotation_schedule);
  69                 if (ret) {
  70                         goto error;
  71                 }
  72         }
  73
  74         ret = lttng_rotation_schedule_attr_set_session_name(attr, session_name);
  75         if (ret < 0) {
  76                 goto error;
  77         }
  78
  79         if (lttng_opt_mi) {
  80                 ret = mi_lttng_writer_write_element_string(writer,
  81                                 mi_lttng_element_session_name, session_name);
  82                 if (ret) {
  83                         goto error;
  84                 }
  85         }
  86
  87         if (timer == -1ULL) {
  88                 lttng_rotation_schedule_attr_set_timer_period(attr, timer);
  89                 MSG("Disabling rotation timer on session %s", session_name);
  90         }
  91         if (size == -1ULL) {
  92                 lttng_rotation_schedule_attr_set_size(attr, size);
  93                 MSG("Disabling rotation based on size on session %s", session_name);
  94         }
  95
  96         ret = lttng_rotation_set_schedule(attr);
  97         if (ret) {
  98                 ERR("%s", lttng_strerror(ret));
  99                 if (lttng_opt_mi) {
 100                         ret = mi_lttng_writer_write_element_string(writer,
 101                                         mi_lttng_element_rotate_status, "error");
 102                         if (ret) {
 103                                 goto end;
 104                         }
 105                         /* Close rotation_schedule element */
 106                         ret = mi_lttng_writer_close_element(writer);
 107                         if (ret) {
 108                                 goto end;
 109                         }
 110                 }
 111                 goto error;
 112         }
 113
 114         if (lttng_opt_mi) {
 115                 ret = mi_lttng_writer_write_element_string(writer,
 116                                 mi_lttng_element_rotate_status, "success");
 117                 if (ret) {
 118                         goto end;
 119                 }
 120
 121                 /* Close rotation_schedule element */
 122                 ret = mi_lttng_writer_close_element(writer);
 123                 if (ret) {
 124                         goto end;
 125                 }
 126         }
 127
 128         ret = 0;
 129         goto end;
 130
 131 error:
 132         ret = -1;
 133 end:
 134         return ret;
 135 }
 136
 137 /*
 138  *  cmd_disable_rotation
 139  *
 140  *  The 'enable-rotation <options>' first level command
 141  */
 142 int cmd_disable_rotation(int argc, const char **argv)
 143 {
 144         int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1;
 145         int popt_ret;
 146         static poptContext pc;
 147         char *session_name = NULL;
 148         bool free_session_name = false;
 149         uint64_t timer = 0, size = 0;
 150
 151         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 152         popt_ret = poptReadDefaultConfig(pc, 0);
 153         if (popt_ret) {
 154                 ret = CMD_ERROR;
 155                 ERR("poptReadDefaultConfig");
 156                 goto end;
 157         }
 158
 159         while ((opt = poptGetNextOpt(pc)) != -1) {
 160                 switch (opt) {
 161                 case OPT_HELP:
 162                         SHOW_HELP();
 163                         goto end;
 164                 case OPT_LIST_OPTIONS:
 165                         list_cmd_options(stdout, long_options);
 166                         goto end;
 167                 case OPT_TIMER:
 168                         timer = -1ULL;
 169                         break;
 170                 case OPT_SIZE:
 171                         size = -1ULL;
 172                         break;
 173                 default:
 174                         ret = CMD_UNDEFINED;
 175                         goto end;
 176                 }
 177         }
 178
 179         if (opt_session_name == NULL) {
 180                 session_name = get_session_name();
 181                 if (session_name == NULL) {
 182                         goto end;
 183                 }
 184                 free_session_name = true;
 185         } else {
 186                 session_name = opt_session_name;
 187         }
 188
 189         /* Mi check */
 190         if (lttng_opt_mi) {
 191                 writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
 192                 if (!writer) {
 193                         ret = -LTTNG_ERR_NOMEM;
 194                         goto end;
 195                 }
 196
 197                 /* Open command element */
 198                 ret = mi_lttng_writer_command_open(writer,
 199                                 mi_lttng_element_command_disable_rotation);
 200                 if (ret) {
 201                         ret = CMD_ERROR;
 202                         goto end;
 203                 }
 204
 205                 /* Open output element */
 206                 ret = mi_lttng_writer_open_element(writer,
 207                                 mi_lttng_element_command_output);
 208                 if (ret) {
 209                         ret = CMD_ERROR;
 210                         goto end;
 211                 }
 212         }
 213
 214         /* No config options, just rotate the session now */
 215         if (timer == 0 && size == 0) {
 216                 ERR("Missing timer period (--timer) or size limit (--size) option");
 217                 success = 0;
 218                 command_ret = -1;
 219         } else {
 220                 command_ret = setup_rotate(session_name, timer, size);
 221         }
 222
 223         if (command_ret) {
 224                 ERR("%s", lttng_strerror(command_ret));
 225                 success = 0;
 226         }
 227
 228         /* Mi closing */
 229         if (lttng_opt_mi) {
 230                 /* Close  output element */
 231                 ret = mi_lttng_writer_close_element(writer);
 232                 if (ret) {
 233                         goto end;
 234                 }
 235
 236                 /* Success ? */
 237                 ret = mi_lttng_writer_write_element_bool(writer,
 238                                 mi_lttng_element_command_success, success);
 239                 if (ret) {
 240                         ret = CMD_ERROR;
 241                         goto end;
 242                 }
 243
 244                 /* Command element close */
 245                 ret = mi_lttng_writer_command_close(writer);
 246                 if (ret) {
 247                         ret = CMD_ERROR;
 248                         goto end;
 249                 }
 250         }
 251
 252 end:
 253         /* Mi clean-up */
 254         if (writer && mi_lttng_writer_destroy(writer)) {
 255                 /* Preserve original error code */
 256                 ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL;
 257         }
 258
 259         /* Overwrite ret if an error occurred with start_tracing */
 260         ret = command_ret ? command_ret : ret;
 261         poptFreeContext(pc);
 262         if (free_session_name) {
 263                 free(session_name);
 264         }
 265         return ret;
 266 }