dss.c

   1 #include <string.h>
   2 #include <stdlib.h>
   3 #include <stdarg.h>
   4 #include <assert.h>
   5 #include <errno.h>
   6 #include <sys/types.h>
   7 #include <signal.h>
   8 #include <ctype.h>
   9 #include <sys/stat.h>
  10 #include <unistd.h>
  11 #include <inttypes.h>
  12 #include <time.h>
  13 #include <sys/wait.h>
  14 #include <fnmatch.h>
  15 #include <limits.h>
  16
  17
  18 #include "gcc-compat.h"
  19 #include "cmdline.h"
  20 #include "log.h"
  21 #include "string.h"
  22 #include "error.h"
  23 #include "fd.h"
  24 #include "exec.h"
  25 #include "daemon.h"
  26
  27
  28 struct gengetopt_args_info conf;
  29 char *dss_error_txt = NULL;
  30 static FILE *logfile;
  31
  32 DEFINE_DSS_ERRLIST;
  33
  34
  35 /* a litte cpp magic helps to DRY */
  36 #define COMMANDS \
  37         COMMAND(ls) \
  38         COMMAND(create) \
  39         COMMAND(prune) \
  40         COMMAND(run)
  41 #define COMMAND(x) int com_ ##x(void);
  42 COMMANDS
  43 #undef COMMAND
  44 #define COMMAND(x) if (conf.x ##_given) return com_ ##x();
  45 int call_command_handler(void)
  46 {
  47         COMMANDS
  48         DSS_EMERG_LOG("BUG: did not find command handler\n");
  49         exit(EXIT_FAILURE);
  50 }
  51 #undef COMMAND
  52 #undef COMMANDS
  53
  54 /*
  55  * complete, not being deleted: 1204565370-1204565371.Sun_Mar_02_2008_14_33-Sun_Mar_02_2008_14_43
  56  * complete, being deleted: 1204565370-1204565371.being_deleted
  57  * incomplete, not being deleted: 1204565370-incomplete
  58  * incomplete, being deleted: 1204565370-incomplete.being_deleted
  59  */
  60 enum snapshot_status_flags {
  61         SS_COMPLETE = 1,
  62         SS_BEING_DELETED = 2,
  63 };
  64
  65 struct snapshot {
  66         char *name;
  67         int64_t creation_time;
  68         int64_t completion_time;
  69         enum snapshot_status_flags flags;
  70         unsigned interval;
  71 };
  72
  73 __printf_2_3 void dss_log(int ll, const char* fmt,...)
  74 {
  75         va_list argp;
  76         FILE *outfd;
  77         struct tm *tm;
  78         time_t t1;
  79         char str[255] = "";
  80
  81         if (ll < conf.loglevel_arg)
  82                 return;
  83         outfd = logfile? logfile : stderr;
  84         time(&t1);
  85         tm = localtime(&t1);
  86         strftime(str, sizeof(str), "%b %d %H:%M:%S", tm);
  87         fprintf(outfd, "%s ", str);
  88         if (conf.loglevel_arg <= INFO)
  89                 fprintf(outfd, "%i: ", ll);
  90         va_start(argp, fmt);
  91         vfprintf(outfd, fmt, argp);
  92         va_end(argp);
  93 }
  94
  95 __printf_1_2 void msg(const char* fmt,...)
  96 {
  97         FILE *outfd = conf.daemon_given? logfile : stdout;
  98         va_list argp;
  99         va_start(argp, fmt);
 100         vfprintf(outfd, fmt, argp);
 101         va_end(argp);
 102 }
 103
 104 int is_snapshot(const char *dirname, int64_t now, struct snapshot *s)
 105 {
 106         int i, ret;
 107         char *dash, *dot, *tmp;
 108         int64_t num;
 109
 110         assert(dirname);
 111         dash = strchr(dirname, '-');
 112         if (!dash || !dash[1] || dash == dirname)
 113                 return 0;
 114         for (i = 0; dirname[i] != '-'; i++)
 115                 if (!isdigit(dirname[i]))
 116                         return 0;
 117         tmp = dss_strdup(dirname);
 118         tmp[i] = '\0';
 119         ret = dss_atoi64(tmp, &num);
 120         free(tmp);
 121         if (ret < 0) {
 122                 free(dss_error_txt);
 123                 return 0;
 124         }
 125         assert(num >= 0);
 126         if (num > now)
 127                 return 0;
 128         s->creation_time = num;
 129         //DSS_DEBUG_LOG("%s start time: %lli\n", dirname, (long long)s->creation_time);
 130         s->interval = (long long) ((now - s->creation_time)
 131                 / conf.unit_interval_arg / 24 / 3600);
 132         if (!strcmp(dash + 1, "incomplete")) {
 133                 s->completion_time = -1;
 134                 s->flags = 0; /* neither complete, nor being deleted */
 135                 goto success;
 136         }
 137         if (!strcmp(dash + 1, "incomplete.being_deleted")) {
 138                 s->completion_time = -1;
 139                 s->flags = SS_BEING_DELETED; /* mot cpmplete, being deleted */
 140                 goto success;
 141         }
 142         tmp = dash + 1;
 143         dot = strchr(tmp, '.');
 144         if (!dot || !dot[1] || dot == tmp)
 145                 return 0;
 146         for (i = 0; tmp[i] != '.'; i++)
 147                 if (!isdigit(tmp[i]))
 148                         return 0;
 149         tmp = dss_strdup(dash + 1);
 150         tmp[i] = '\0';
 151         ret = dss_atoi64(tmp, &num);
 152         free(tmp);
 153         if (ret < 0) {
 154                 free(dss_error_txt);
 155                 return 0;
 156         }
 157         if (num > now)
 158                 return 0;
 159         s->completion_time = num;
 160         s->flags = SS_COMPLETE;
 161         if (strcmp(dot + 1, "being_deleted"))
 162                 s->flags |= SS_BEING_DELETED;
 163 success:
 164         s->name = dss_strdup(dirname);
 165         return 1;
 166 }
 167
 168 int64_t get_current_time(void)
 169 {
 170         time_t now;
 171         time(&now);
 172         DSS_DEBUG_LOG("now: %lli\n", (long long) now);
 173         return (int64_t)now;
 174 }
 175
 176 char *incomplete_name(int64_t start)
 177 {
 178         return make_message("%lli-incomplete", (long long)start);
 179 }
 180
 181 char *being_deleted_name(struct snapshot *s)
 182 {
 183         if (s->flags & SS_COMPLETE)
 184                 return make_message("%lli-%lli.being_deleted",
 185                         (long long)s->creation_time,
 186                         (long long)s->completion_time);
 187         return make_message("%lli-incomplete.being_deleted",
 188                 (long long)s->creation_time);
 189 }
 190
 191 int complete_name(int64_t start, int64_t end, char **result)
 192 {
 193         struct tm start_tm, end_tm;
 194         time_t *start_seconds = (time_t *) (uint64_t *)&start; /* STFU, gcc */
 195         time_t *end_seconds = (time_t *) (uint64_t *)&end; /* STFU, gcc */
 196         char start_str[200], end_str[200];
 197
 198         if (!localtime_r(start_seconds, &start_tm)) {
 199                 make_err_msg("%lli", (long long)start);
 200                 return -E_LOCALTIME;
 201         }
 202         if (!localtime_r(end_seconds, &end_tm)) {
 203                 make_err_msg("%lli", (long long)end);
 204                 return -E_LOCALTIME;
 205         }
 206         if (!strftime(start_str, sizeof(start_str), "%a_%b_%d_%Y_%H_%M_%S", &start_tm)) {
 207                 make_err_msg("%lli", (long long)start);
 208                 return -E_STRFTIME;
 209         }
 210         if (!strftime(end_str, sizeof(end_str), "%a_%b_%d_%Y_%H_%M_%S", &end_tm)) {
 211                 make_err_msg("%lli", (long long)end);
 212                 return -E_STRFTIME;
 213         }
 214         *result = make_message("%lli-%lli.%s-%s", (long long) start, (long long) end,
 215                 start_str, end_str);
 216         return 1;
 217 }
 218
 219 struct snapshot_list {
 220         int64_t now;
 221         unsigned num_snapshots;
 222         unsigned array_size;
 223         struct snapshot **snapshots;
 224         /**
 225          * Array of size num_intervals + 1
 226          *
 227          * It contains the number of snapshots in each interval. interval_count[num_intervals]
 228          * is the number of snapshots which belong to any interval greater than num_intervals.
 229          */
 230         unsigned *interval_count;
 231 };
 232
 233 #define FOR_EACH_SNAPSHOT(s, i, sl) \
 234         for ((i) = 0; (i) < (sl)->num_snapshots && ((s) = (sl)->snapshots[(i)]); (i)++)
 235
 236
 237
 238 #define NUM_COMPARE(x, y) ((int)((x) < (y)) - (int)((x) > (y)))
 239
 240 static int compare_snapshots(const void *a, const void *b)
 241 {
 242         struct snapshot *s1 = *(struct snapshot **)a;
 243         struct snapshot *s2 = *(struct snapshot **)b;
 244         return NUM_COMPARE(s2->creation_time, s1->creation_time);
 245 }
 246
 247 /** Compute the minimum of \a a and \a b. */
 248 #define DSS_MIN(a,b) ((a) < (b) ? (a) : (b))
 249
 250 int add_snapshot(const char *dirname, void *private)
 251 {
 252         struct snapshot_list *sl = private;
 253         struct snapshot s;
 254         int ret = is_snapshot(dirname, sl->now, &s);
 255
 256         if (!ret)
 257                 return 1;
 258         if (sl->num_snapshots >= sl->array_size) {
 259                 sl->array_size = 2 * sl->array_size + 1;
 260                 sl->snapshots = dss_realloc(sl->snapshots,
 261                         sl->array_size * sizeof(struct snapshot *));
 262         }
 263         sl->snapshots[sl->num_snapshots] = dss_malloc(sizeof(struct snapshot));
 264         *(sl->snapshots[sl->num_snapshots]) = s;
 265         sl->interval_count[DSS_MIN(s.interval, conf.num_intervals_arg)]++;
 266         sl->num_snapshots++;
 267         return 1;
 268 }
 269
 270 void get_snapshot_list(struct snapshot_list *sl)
 271 {
 272         sl->now = get_current_time();
 273         sl->num_snapshots = 0;
 274         sl->array_size = 0;
 275         sl->snapshots = NULL;
 276         sl->interval_count = dss_calloc((conf.num_intervals_arg + 1) * sizeof(unsigned));
 277         for_each_subdir(add_snapshot, sl);
 278         qsort(sl->snapshots, sl->num_snapshots, sizeof(struct snapshot *),
 279                 compare_snapshots);
 280 }
 281
 282 void free_snapshot_list(struct snapshot_list *sl)
 283 {
 284         int i;
 285         struct snapshot *s;
 286
 287         FOR_EACH_SNAPSHOT(s, i, sl) {
 288                 free(s->name);
 289                 free(s);
 290         }
 291         free(sl->interval_count);
 292         free(sl->snapshots);
 293 }
 294
 295 /**
 296  * Print a log message about the exit status of a child.
 297  */
 298 void log_termination_msg(pid_t pid, int status)
 299 {
 300         if (WIFEXITED(status))
 301                 DSS_INFO_LOG("child %i exited. Exit status: %i\n", (int)pid,
 302                         WEXITSTATUS(status));
 303         else if (WIFSIGNALED(status))
 304                 DSS_NOTICE_LOG("child %i was killed by signal %i\n", (int)pid,
 305                         WTERMSIG(status));
 306         else
 307                 DSS_WARNING_LOG("child %i terminated abormally\n", (int)pid);
 308 }
 309
 310 int wait_for_process(pid_t pid, int *status)
 311 {
 312         int ret;
 313
 314         DSS_DEBUG_LOG("Waiting for process %d to terminate\n", (int)pid);
 315         for (;;) {
 316                 ret = waitpid(pid, status, 0);
 317                 if (ret >= 0 || errno != EINTR)
 318                         break;
 319         }
 320         if (ret < 0) {
 321                 ret = -ERRNO_TO_DSS_ERROR(errno);
 322                 make_err_msg("failed to wait for process %d", (int)pid);
 323         } else
 324                 log_termination_msg(pid, *status);
 325         return ret;
 326 }
 327
 328 int remove_snapshot(struct snapshot *s, pid_t *pid)
 329 {
 330         int fds[3] = {0, 0, 0};
 331         char *new_name = being_deleted_name(s);
 332         int ret = dss_rename(s->name, new_name);
 333         char *argv[] = {"rm", "-rf", new_name, NULL};
 334
 335         if (ret < 0)
 336                 goto out;
 337         DSS_NOTICE_LOG("removing %s (interval = %i)\n", s->name, s->interval);
 338         ret = dss_exec(pid, argv[0], argv, fds);
 339 out:
 340         free(new_name);
 341         return ret;
 342 }
 343
 344 int remove_redundant_snapshot(struct snapshot_list *sl,
 345                 int dry_run, pid_t *pid)
 346 {
 347         int ret, i, interval;
 348         struct snapshot *s;
 349         unsigned missing = 0;
 350
 351         DSS_INFO_LOG("looking for intervals containing too many snapshots\n");
 352         for (interval = conf.num_intervals_arg - 1; interval >= 0; interval--) {
 353                 unsigned keep = 1<<(conf.num_intervals_arg - interval - 1);
 354                 unsigned num = sl->interval_count[interval];
 355                 struct snapshot *victim = NULL, *prev = NULL;
 356                 int64_t score = LONG_MAX;
 357
 358                 if (keep >= num)
 359                         missing += keep - num;
 360                 DSS_DEBUG_LOG("interval %i: keep: %u, have: %u, missing: %u\n",
 361                         interval, keep, num, missing);
 362                 if (keep + missing >= num)
 363                         continue;
 364                 /* redundant snapshot in this interval, pick snapshot with lowest score */
 365                 FOR_EACH_SNAPSHOT(s, i, sl) {
 366                         int64_t this_score;
 367
 368                         DSS_DEBUG_LOG("checking %s\n", s->name);
 369                         if (s->interval > interval) {
 370                                 prev = s;
 371                                 continue;
 372                         }
 373                         if (s->interval < interval)
 374                                 break;
 375                         if (!victim) {
 376                                 victim = s;
 377                                 prev = s;
 378                                 continue;
 379                         }
 380                         assert(prev);
 381                         /* check if s is a better victim */
 382                         this_score = s->creation_time - prev->creation_time;
 383                         assert(this_score >= 0);
 384                         DSS_DEBUG_LOG("%s: score %lli\n", s->name, (long long)score);
 385                         if (this_score < score) {
 386                                 score = this_score;
 387                                 victim = s;
 388                         }
 389                         prev = s;
 390                 }
 391                 assert(victim);
 392                 if (dry_run) {
 393                         msg("%s would be removed (interval = %i)\n",
 394                                 victim->name, victim->interval);
 395                         continue;
 396                 }
 397                 ret = remove_snapshot(victim, pid);
 398                 return ret < 0? ret : 1;
 399         }
 400         return 0;
 401 }
 402
 403 int remove_old_snapshot(struct snapshot_list *sl, int dry_run, pid_t *pid)
 404 {
 405         int i, ret;
 406         struct snapshot *s;
 407
 408         DSS_INFO_LOG("looking for snapshots belonging to intervals greater than %d\n",
 409                 conf.num_intervals_arg);
 410         FOR_EACH_SNAPSHOT(s, i, sl) {
 411                 if (s->interval <= conf.num_intervals_arg)
 412                         continue;
 413                 if (dry_run) {
 414                         msg("%s would be removed (interval = %i)\n",
 415                                 s->name, s->interval);
 416                         continue;
 417                 }
 418                 ret = remove_snapshot(s, pid);
 419                 if (ret < 0)
 420                         return ret;
 421                 return 1;
 422         }
 423         return 0;
 424 }
 425
 426 int wait_for_rm_process(pid_t pid)
 427 {
 428         int status, es, ret = wait_for_process(pid, &status);
 429         if (ret < 0)
 430                 return ret;
 431         if (!WIFEXITED(status)) {
 432                 ret = E_INVOLUNTARY_EXIT;
 433                 make_err_msg("rm process %d died involuntary", (int)pid);
 434                 return ret;
 435         }
 436         es = WEXITSTATUS(status);
 437         if (es) {
 438                 ret = -E_BAD_EXIT_CODE;
 439                 make_err_msg("rm process %d returned %d", (int)pid, es);
 440                 return ret;
 441         }
 442         return 1;
 443 }
 444
 445 int com_run(void)
 446 {
 447         return 42;
 448 }
 449
 450 int com_prune(void)
 451 {
 452         int ret, dry_run = 0;
 453         struct snapshot_list sl;
 454         pid_t pid;
 455
 456         for (;;) {
 457                 get_snapshot_list(&sl);
 458                 ret = remove_old_snapshot(&sl, dry_run, &pid);
 459                 free_snapshot_list(&sl);
 460                 if (ret < 0)
 461                         return ret;
 462                 if (!ret)
 463                         break;
 464                 ret = wait_for_rm_process(pid);
 465                 if (ret < 0)
 466                         goto out;
 467         }
 468         for (;;) {
 469                 get_snapshot_list(&sl);
 470                 ret = remove_redundant_snapshot(&sl, dry_run, &pid);
 471                 free_snapshot_list(&sl);
 472                 if (ret < 0)
 473                         return ret;
 474                 if (!ret)
 475                         break;
 476                 ret = wait_for_rm_process(pid);
 477                 if (ret < 0)
 478                         goto out;
 479         }
 480         return 1;
 481 out:
 482         return ret;
 483 }
 484
 485 struct newest_snapshot_data {
 486         char * newest_name;
 487         int64_t newest_creation_time;
 488         int64_t now;
 489 };
 490
 491 int get_newest_complete(const char *dirname, void *private)
 492 {
 493         struct newest_snapshot_data *nsd = private;
 494         struct snapshot s;
 495         int ret = is_snapshot(dirname, nsd->now, &s);
 496
 497         if (ret <= 0)
 498                 return 1;
 499         if (s.creation_time < nsd->newest_creation_time)
 500                 return 1;
 501         nsd->newest_creation_time = s.creation_time;
 502         free(nsd->newest_name);
 503         nsd->newest_name = s.name;
 504         return 1;
 505 }
 506
 507 __malloc char *name_of_newest_complete_snapshot(void)
 508 {
 509         struct newest_snapshot_data nsd = {
 510                 .now = get_current_time(),
 511                 .newest_creation_time = -1
 512         };
 513         for_each_subdir(get_newest_complete, &nsd);
 514         return nsd.newest_name;
 515 }
 516
 517 void create_rsync_argv(char ***argv, int64_t *num)
 518 {
 519         char *logname, *newest = name_of_newest_complete_snapshot();
 520         int i = 0, j;
 521
 522         *argv = dss_malloc((15 + conf.rsync_option_given) * sizeof(char *));
 523         (*argv)[i++] = dss_strdup("rsync");
 524         (*argv)[i++] = dss_strdup("-aq");
 525         (*argv)[i++] = dss_strdup("--delete");
 526         for (j = 0; j < conf.rsync_option_given; j++)
 527                 (*argv)[i++] = dss_strdup(conf.rsync_option_arg[j]);
 528         if (newest) {
 529                 DSS_INFO_LOG("using %s as reference snapshot\n", newest);
 530                 (*argv)[i++] = make_message("--link-dest=../%s", newest);
 531                 free(newest);
 532         } else
 533                 DSS_INFO_LOG("no previous snapshot found");
 534         if (conf.exclude_patterns_given) {
 535                 (*argv)[i++] = dss_strdup("--exclude-from");
 536                 (*argv)[i++] = dss_strdup(conf.exclude_patterns_arg);
 537
 538         }
 539         logname = dss_logname();
 540         if (conf.remote_user_given && !strcmp(conf.remote_user_arg, logname))
 541                 (*argv)[i++] = dss_strdup(conf.source_dir_arg);
 542         else
 543                 (*argv)[i++] = make_message("%s@%s:%s/", conf.remote_user_given?
 544                         conf.remote_user_arg : logname,
 545                         conf.remote_host_arg, conf.source_dir_arg);
 546         free(logname);
 547         *num = get_current_time();
 548         (*argv)[i++] = incomplete_name(*num);
 549         (*argv)[i++] = NULL;
 550         for (j = 0; j < i; j++)
 551                 DSS_DEBUG_LOG("argv[%d] = %s\n", j, (*argv)[j]);
 552 }
 553
 554 void free_rsync_argv(char **argv)
 555 {
 556         int i;
 557         for (i = 0; argv[i]; i++)
 558                 free(argv[i]);
 559         free(argv);
 560 }
 561
 562 int create_snapshot(char **argv, pid_t *pid)
 563 {
 564         int fds[3] = {0, 0, 0};
 565
 566         return dss_exec(pid, argv[0], argv, fds);
 567 }
 568
 569 int rename_incomplete_snapshot(int64_t start)
 570 {
 571         char *old_name, *new_name;
 572         int ret;
 573
 574         ret = complete_name(start, get_current_time(), &new_name);
 575         if (ret < 0)
 576                 return ret;
 577         old_name = incomplete_name(start);
 578         ret = dss_rename(old_name, new_name);
 579         if (ret >= 0)
 580                 DSS_NOTICE_LOG("%s -> %s\n", old_name, new_name);
 581         free(old_name);
 582         free(new_name);
 583         return ret;
 584 }
 585
 586 int com_create(void)
 587 {
 588         int ret, status, es;
 589         char **rsync_argv;
 590         int64_t snapshot_num;
 591         pid_t pid;
 592
 593         create_rsync_argv(&rsync_argv, &snapshot_num);
 594         DSS_NOTICE_LOG("creating snapshot %lli\n", (long long)snapshot_num);
 595         ret = create_snapshot(rsync_argv, &pid);
 596         if (ret < 0)
 597                 goto out;
 598         ret = wait_for_process(pid, &status);
 599         if (ret < 0)
 600                 goto out;
 601         if (!WIFEXITED(status)) {
 602                 ret = E_INVOLUNTARY_EXIT;
 603                 make_err_msg("rsync process %d died involuntary", (int)pid);
 604                 goto out;
 605         }
 606         es = WEXITSTATUS(status);
 607         if (es != 0 && es != 23 && es != 24) {
 608                 ret = -E_BAD_EXIT_CODE;
 609                 make_err_msg("rsync process %d returned %d", (int)pid, es);
 610                 goto out;
 611         }
 612         ret = rename_incomplete_snapshot(snapshot_num);
 613 out:
 614         free_rsync_argv(rsync_argv);
 615         return ret;
 616 }
 617
 618 int com_ls(void)
 619 {
 620         int i;
 621         struct snapshot_list sl;
 622         struct snapshot *s;
 623         get_snapshot_list(&sl);
 624         FOR_EACH_SNAPSHOT(s, i, &sl)
 625                 msg("%u\t%s\n", s->interval, s->name);
 626         free_snapshot_list(&sl);
 627         return 1;
 628 }
 629
 630 /* TODO: Unlink pid file */
 631 __noreturn void clean_exit(int status)
 632 {
 633         //kill(0, SIGTERM);
 634         free(dss_error_txt);
 635         exit(status);
 636 }
 637
 638 int read_config_file(void)
 639 {
 640         int ret;
 641         char *config_file;
 642         struct stat statbuf;
 643
 644         if (conf.config_file_given)
 645                 config_file = dss_strdup(conf.config_file_arg);
 646         else {
 647                 char *home = get_homedir();
 648                 config_file = make_message("%s/.dssrc", home);
 649                 free(home);
 650         }
 651         ret = stat(config_file, &statbuf);
 652         if (ret && conf.config_file_given) {
 653                 ret = -ERRNO_TO_DSS_ERROR(errno);
 654                 make_err_msg("failed to stat config file %s", config_file);
 655                 goto out;
 656         }
 657         if (!ret) {
 658                 struct cmdline_parser_params params = {
 659                         .override = 0,
 660                         .initialize = 0,
 661                         .check_required = 0,
 662                         .check_ambiguity = 0
 663                 };
 664                 cmdline_parser_config_file(config_file, &conf, &params);
 665         }
 666         if (!conf.source_dir_given || !conf.dest_dir_given) {
 667                 ret = -E_SYNTAX;
 668                 make_err_msg("you need to specify both source_dir and dest_dir");
 669                 goto out;
 670         }
 671         ret = 1;
 672 out:
 673         free(config_file);
 674         return ret;
 675 }
 676
 677 int check_config(void)
 678 {
 679         if (conf.unit_interval_arg <= 0) {
 680                 make_err_msg("bad unit interval: %i", conf.unit_interval_arg);
 681                 return -E_INVALID_NUMBER;
 682         }
 683         DSS_DEBUG_LOG("unit interval: %i day(s)\n", conf.unit_interval_arg);
 684         if (conf.num_intervals_arg <= 0) {
 685                 make_err_msg("bad number of intervals  %i", conf.num_intervals_arg);
 686                 return -E_INVALID_NUMBER;
 687         }
 688         DSS_DEBUG_LOG("number of intervals: %i\n", conf.num_intervals_arg);
 689         return 1;
 690 }
 691
 692 int main(int argc, char **argv)
 693 {
 694         int ret;
 695
 696         cmdline_parser(argc, argv, &conf); /* aborts on errors */
 697         if (conf.inputs_num) {
 698                 ret = -E_SYNTAX;
 699                 make_err_msg("additional non-options given");
 700                 goto out;
 701         }
 702         ret = read_config_file();
 703         if (ret < 0)
 704                 goto out;
 705         ret = check_config();
 706         if (ret < 0)
 707                 goto out;
 708         if (conf.logfile_given) {
 709                 logfile = open_log(conf.logfile_arg);
 710                 log_welcome(conf.loglevel_arg);
 711         }
 712         if (conf.daemon_given)
 713                 daemon_init();
 714         ret = dss_chdir(conf.dest_dir_arg);
 715         if (ret < 0)
 716                 goto out;
 717         ret = call_command_handler();
 718 out:
 719         if (ret < 0)
 720                 log_err_msg(EMERG, -ret);
 721         clean_exit(ret >= 0? EXIT_SUCCESS : EXIT_FAILURE);
 722 }