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         ret = lttng_rotation_schedule_attr_set_session_name(attr, session_name);
  81         if (ret < 0) {
  82                 goto error;
  83         }
  84
  85         if (lttng_opt_mi) {
  86                 ret = mi_lttng_writer_write_element_string(writer,
  87                                 mi_lttng_element_session_name, session_name);
  88                 if (ret) {
  89                         goto error;
  90                 }
  91         }
  92
  93         if (timer == -1ULL) {
  94                 lttng_rotation_schedule_attr_set_timer_period(attr, timer);
  95                 MSG("Disabling rotation timer on session %s", session_name);
  96         }
  97         if (size == -1ULL) {
  98                 lttng_rotation_schedule_attr_set_size(attr, size);
  99                 MSG("Disabling rotation based on size on session %s", session_name);
 100         }
 101
 102         ret = lttng_rotation_set_schedule(attr);
 103         if (ret) {
 104                 ERR("%s", lttng_strerror(ret));
 105                 if (lttng_opt_mi) {
 106                         ret = mi_lttng_writer_write_element_string(writer,
 107                                         mi_lttng_element_rotate_status, "error");
 108                         if (ret) {
 109                                 goto end;
 110                         }
 111                         /* Close rotation_schedule element */
 112                         ret = mi_lttng_writer_close_element(writer);
 113                         if (ret) {
 114                                 goto end;
 115                         }
 116                 }
 117                 goto error;
 118         }
 119
 120         if (lttng_opt_mi) {
 121                 ret = mi_lttng_writer_write_element_string(writer,
 122                                 mi_lttng_element_rotate_status, "success");
 123                 if (ret) {
 124                         goto end;
 125                 }
 126
 127                 /* Close rotation_schedule element */
 128                 ret = mi_lttng_writer_close_element(writer);
 129                 if (ret) {
 130                         goto end;
 131                 }
 132         }
 133
 134         ret = 0;
 135         goto end;
 136
 137 error:
 138         ret = -1;
 139 end:
 140         return ret;
 141 }
 142
 143 /*
 144  *  cmd_disable_rotation
 145  *
 146  *  The 'enable-rotation <options>' first level command
 147  */
 148 int cmd_disable_rotation(int argc, const char **argv)
 149 {
 150         int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1;
 151         int popt_ret;
 152         static poptContext pc;
 153         char *session_name = NULL;
 154         bool free_session_name = false;
 155         uint64_t timer = 0, size = 0;
 156
 157         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 158         popt_ret = poptReadDefaultConfig(pc, 0);
 159         if (popt_ret) {
 160                 ret = CMD_ERROR;
 161                 ERR("poptReadDefaultConfig");
 162                 goto end;
 163         }
 164
 165         while ((opt = poptGetNextOpt(pc)) != -1) {
 166                 switch (opt) {
 167                 case OPT_HELP:
 168                         SHOW_HELP();
 169                         goto end;
 170                 case OPT_LIST_OPTIONS:
 171                         list_cmd_options(stdout, long_options);
 172                         goto end;
 173                 case OPT_TIMER:
 174                         timer = -1ULL;
 175                         break;
 176                 case OPT_SIZE:
 177                         size = -1ULL;
 178                         break;
 179                 default:
 180                         ret = CMD_UNDEFINED;
 181                         goto end;
 182                 }
 183         }
 184
 185         if (opt_session_name == NULL) {
 186                 session_name = get_session_name();
 187                 if (session_name == NULL) {
 188                         goto end;
 189                 }
 190                 free_session_name = true;
 191         } else {
 192                 session_name = opt_session_name;
 193         }
 194
 195         /* Mi check */
 196         if (lttng_opt_mi) {
 197                 writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
 198                 if (!writer) {
 199                         ret = -LTTNG_ERR_NOMEM;
 200                         goto end;
 201                 }
 202
 203                 /* Open command element */
 204                 ret = mi_lttng_writer_command_open(writer,
 205                                 mi_lttng_element_command_disable_rotation);
 206                 if (ret) {
 207                         ret = CMD_ERROR;
 208                         goto end;
 209                 }
 210
 211                 /* Open output element */
 212                 ret = mi_lttng_writer_open_element(writer,
 213                                 mi_lttng_element_command_output);
 214                 if (ret) {
 215                         ret = CMD_ERROR;
 216                         goto end;
 217                 }
 218         }
 219
 220         /* No config options, just rotate the session now */
 221         if (timer == 0 && size == 0) {
 222                 ERR("Missing timer period (--timer) or size limit (--size) option");
 223                 success = 0;
 224                 command_ret = -1;
 225         } else {
 226                 command_ret = setup_rotate(session_name, timer, size);
 227         }
 228
 229         if (command_ret) {
 230                 ERR("%s", lttng_strerror(command_ret));
 231                 success = 0;
 232         }
 233
 234         /* Mi closing */
 235         if (lttng_opt_mi) {
 236                 /* Close  output element */
 237                 ret = mi_lttng_writer_close_element(writer);
 238                 if (ret) {
 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
 258 end:
 259         /* Mi clean-up */
 260         if (writer && mi_lttng_writer_destroy(writer)) {
 261                 /* Preserve original error code */
 262                 ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL;
 263         }
 264
 265         /* Overwrite ret if an error occurred with start_tracing */
 266         ret = command_ret ? command_ret : ret;
 267         poptFreeContext(pc);
 268         if (free_session_name) {
 269                 free(session_name);
 270         }
 271         return ret;
 272 }