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