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