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 #ifdef LTTNG_EMBED_HELP
  39 static const char help_msg[] =
  40 #include <lttng-disable-rotation.1.h>
  41 ;
  42 #endif
  43
  44 enum {
  45         OPT_HELP = 1,
  46         OPT_LIST_OPTIONS,
  47         OPT_TIMER,
  48         OPT_SIZE,
  49 };
  50
  51 static struct poptOption long_options[] = {
  52         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  53         {"help",        'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
  54         {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
  55         {"session",     's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0},
  56         {"timer",        0,   POPT_ARG_NONE, 0, OPT_TIMER, 0, 0},
  57         {"size",         0,   POPT_ARG_NONE, 0, OPT_SIZE, 0, 0},
  58         {0, 0, 0, 0, 0, 0, 0}
  59 };
  60
  61 static int setup_rotate(char *session_name, uint64_t timer, uint64_t size)
  62 {
  63         int ret = 0;
  64         struct lttng_rotation_schedule_attr *attr = NULL;
  65
  66         attr = lttng_rotation_schedule_attr_create();
  67         if (!attr) {
  68                 goto error;
  69         }
  70
  71         if (lttng_opt_mi) {
  72                 /* Open rotation_schedule element */
  73                 ret = mi_lttng_writer_open_element(writer,
  74                                 config_element_rotation_schedule);
  75                 if (ret) {
  76                         goto error;
  77                 }
  78         }
  79
  80         if (lttng_opt_mi) {
  81                 ret = mi_lttng_writer_write_element_string(writer,
  82                                 mi_lttng_element_session_name, session_name);
  83                 if (ret) {
  84                         goto error;
  85                 }
  86         }
  87
  88         if (timer == -1ULL) {
  89                 lttng_rotation_schedule_attr_set_timer_period(attr, timer);
  90                 MSG("Disabling rotation timer on session %s", session_name);
  91         }
  92         if (size == -1ULL) {
  93                 lttng_rotation_schedule_attr_set_size(attr, size);
  94                 MSG("Disabling rotation based on size on session %s", session_name);
  95         }
  96
  97         ret = lttng_rotation_set_schedule(session_name, attr);
  98         if (ret) {
  99                 ERR("%s", lttng_strerror(ret));
 100                 if (lttng_opt_mi) {
 101                         ret = mi_lttng_writer_write_element_string(writer,
 102                                         mi_lttng_element_rotate_status, "error");
 103                         if (ret) {
 104                                 goto end;
 105                         }
 106                         /* Close rotation_schedule element */
 107                         ret = mi_lttng_writer_close_element(writer);
 108                         if (ret) {
 109                                 goto end;
 110                         }
 111                 }
 112                 goto error;
 113         }
 114
 115         if (lttng_opt_mi) {
 116                 ret = mi_lttng_writer_write_element_string(writer,
 117                                 mi_lttng_element_rotate_status, "success");
 118                 if (ret) {
 119                         goto end;
 120                 }
 121
 122                 /* Close rotation_schedule element */
 123                 ret = mi_lttng_writer_close_element(writer);
 124                 if (ret) {
 125                         goto end;
 126                 }
 127         }
 128
 129         ret = 0;
 130         goto end;
 131
 132 error:
 133         ret = -1;
 134 end:
 135         return ret;
 136 }
 137
 138 /*
 139  *  cmd_disable_rotation
 140  *
 141  *  The 'enable-rotation <options>' first level command
 142  */
 143 int cmd_disable_rotation(int argc, const char **argv)
 144 {
 145         int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1;
 146         int popt_ret;
 147         static poptContext pc;
 148         char *session_name = NULL;
 149         bool free_session_name = false;
 150         uint64_t timer = 0, size = 0;
 151
 152         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 153         popt_ret = poptReadDefaultConfig(pc, 0);
 154         if (popt_ret) {
 155                 ret = CMD_ERROR;
 156                 ERR("poptReadDefaultConfig");
 157                 goto end;
 158         }
 159
 160         while ((opt = poptGetNextOpt(pc)) != -1) {
 161                 switch (opt) {
 162                 case OPT_HELP:
 163                         SHOW_HELP();
 164                         goto end;
 165                 case OPT_LIST_OPTIONS:
 166                         list_cmd_options(stdout, long_options);
 167                         goto end;
 168                 case OPT_TIMER:
 169                         timer = -1ULL;
 170                         break;
 171                 case OPT_SIZE:
 172                         size = -1ULL;
 173                         break;
 174                 default:
 175                         ret = CMD_UNDEFINED;
 176                         goto end;
 177                 }
 178         }
 179
 180         if (opt_session_name == NULL) {
 181                 session_name = get_session_name();
 182                 if (session_name == NULL) {
 183                         goto end;
 184                 }
 185                 free_session_name = true;
 186         } else {
 187                 session_name = opt_session_name;
 188         }
 189
 190         /* Mi check */
 191         if (lttng_opt_mi) {
 192                 writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
 193                 if (!writer) {
 194                         ret = -LTTNG_ERR_NOMEM;
 195                         goto end;
 196                 }
 197
 198                 /* Open command element */
 199                 ret = mi_lttng_writer_command_open(writer,
 200                                 mi_lttng_element_command_disable_rotation);
 201                 if (ret) {
 202                         ret = CMD_ERROR;
 203                         goto end;
 204                 }
 205
 206                 /* Open output element */
 207                 ret = mi_lttng_writer_open_element(writer,
 208                                 mi_lttng_element_command_output);
 209                 if (ret) {
 210                         ret = CMD_ERROR;
 211                         goto end;
 212                 }
 213         }
 214
 215         /* No config options, just rotate the session now */
 216         if (timer == 0 && size == 0) {
 217                 ERR("Missing timer period (--timer) or size limit (--size) option");
 218                 success = 0;
 219                 command_ret = -1;
 220         } else {
 221                 command_ret = setup_rotate(session_name, timer, size);
 222         }
 223
 224         if (command_ret) {
 225                 ERR("%s", lttng_strerror(command_ret));
 226                 success = 0;
 227         }
 228
 229         /* Mi closing */
 230         if (lttng_opt_mi) {
 231                 /* Close  output element */
 232                 ret = mi_lttng_writer_close_element(writer);
 233                 if (ret) {
 234                         goto end;
 235                 }
 236
 237                 /* Success ? */
 238                 ret = mi_lttng_writer_write_element_bool(writer,
 239                                 mi_lttng_element_command_success, success);
 240                 if (ret) {
 241                         ret = CMD_ERROR;
 242                         goto end;
 243                 }
 244
 245                 /* Command element close */
 246                 ret = mi_lttng_writer_command_close(writer);
 247                 if (ret) {
 248                         ret = CMD_ERROR;
 249                         goto end;
 250                 }
 251         }
 252
 253 end:
 254         /* Mi clean-up */
 255         if (writer && mi_lttng_writer_destroy(writer)) {
 256                 /* Preserve original error code */
 257                 ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL;
 258         }
 259
 260         /* Overwrite ret if an error occurred with start_tracing */
 261         ret = command_ret ? command_ret : ret;
 262         poptFreeContext(pc);
 263         if (free_session_name) {
 264                 free(session_name);
 265         }
 266         return ret;
 267 }