str.c: Get rid of VSPRINTF macro.
[dss.git] / dss.c
1 /*
2 * Copyright (C) 2008-2011 Andre Noll <maan@tuebingen.mpg.de>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6 #include <string.h>
7 #include <stdlib.h>
8 #include <stdarg.h>
9 #include <assert.h>
10 #include <errno.h>
11 #include <sys/types.h>
12 #include <signal.h>
13 #include <ctype.h>
14 #include <sys/stat.h>
15 #include <unistd.h>
16 #include <inttypes.h>
17 #include <sys/time.h>
18 #include <time.h>
19 #include <sys/wait.h>
20 #include <fnmatch.h>
21 #include <limits.h>
22
23
24 #include "gcc-compat.h"
25 #include "cmdline.h"
26 #include "log.h"
27 #include "str.h"
28 #include "err.h"
29 #include "file.h"
30 #include "exec.h"
31 #include "daemon.h"
32 #include "sig.h"
33 #include "df.h"
34 #include "tv.h"
35 #include "snap.h"
36 #include "ipc.h"
37
38 /** Command line and config file options. */
39 static struct gengetopt_args_info conf;
40 /** Non-NULL if we log to a file. */
41 static FILE *logfile;
42 /** The read end of the signal pipe */
43 static int signal_pipe;
44 /** Process id of current pre-create-hook/rsync/post-create-hook process. */
45 static pid_t create_pid;
46 /** Whether the pre-create-hook/rsync/post-create-hook is currently stopped. */
47 static int create_process_stopped;
48 /** Process id of current pre-remove/rm/post-remove process. */
49 static pid_t remove_pid;
50 /** When the next snapshot is due. */
51 static int64_t next_snapshot_time;
52 /** When to try to remove something. */
53 static struct timeval next_removal_check;
54 /** Creation time of the snapshot currently being created. */
55 static int64_t current_snapshot_creation_time;
56 /** The snapshot currently being removed. */
57 struct snapshot *snapshot_currently_being_removed;
58 /** Needed by the post-create hook. */
59 static char *path_to_last_complete_snapshot;
60 static char *name_of_reference_snapshot;
61 /** \sa \ref snap.h for details. */
62 enum hook_status snapshot_creation_status;
63 /** \sa \ref snap.h for details. */
64 enum hook_status snapshot_removal_status;
65
66
67 DEFINE_DSS_ERRLIST;
68 static const char *hook_status_description[] = {HOOK_STATUS_ARRAY};
69
70 /* may be called with ds == NULL. */
71 static int disk_space_low(struct disk_space *ds)
72 {
73 struct disk_space ds_struct;
74
75 if (!ds) {
76 int ret = get_disk_space(".", &ds_struct);
77 if (ret < 0)
78 return ret;
79 ds = &ds_struct;
80 }
81 if (conf.min_free_mb_arg)
82 if (ds->free_mb < conf.min_free_mb_arg)
83 return 1;
84 if (conf.min_free_percent_arg)
85 if (ds->percent_free < conf.min_free_percent_arg)
86 return 1;
87 if (conf.min_free_percent_inodes_arg)
88 if (ds->percent_free_inodes < conf.min_free_percent_inodes_arg)
89 return 1;
90 return 0;
91 }
92
93 static void dump_dss_config(const char *msg)
94 {
95 const char dash[] = "-----------------------------";
96 int ret;
97 FILE *log = logfile? logfile : stderr;
98 struct disk_space ds;
99 int64_t now = get_current_time();
100
101 if (conf.loglevel_arg > INFO)
102 return;
103
104 fprintf(log, "%s <%s config> %s\n", dash, msg, dash);
105 fprintf(log, "\n*** disk space ***\n\n");
106 ret = get_disk_space(".", &ds);
107 if (ret >= 0) {
108 DSS_INFO_LOG(("disk space low: %s\n", disk_space_low(&ds)?
109 "yes" : "no"));
110 log_disk_space(&ds);
111 } else
112 DSS_ERROR_LOG(("can not get free disk space: %s\n",
113 dss_strerror(-ret)));
114
115 /* we continue on errors from get_disk_space */
116
117 fprintf(log, "\n*** command line and config file options ***\n\n");
118 cmdline_parser_dump(log, &conf);
119 fprintf(log, "\n*** internal state ***\n\n");
120 fprintf(log,
121 "pid: %d\n"
122 "logile: %s\n"
123 "snapshot_currently_being_removed: %s\n"
124 "path_to_last_complete_snapshot: %s\n"
125 "reference_snapshot: %s\n"
126 "snapshot_creation_status: %s\n"
127 "snapshot_removal_status: %s\n"
128 ,
129 (int) getpid(),
130 logfile? conf.logfile_arg : "stderr",
131 snapshot_currently_being_removed?
132 snapshot_currently_being_removed->name : "(none)",
133 path_to_last_complete_snapshot?
134 path_to_last_complete_snapshot : "(none)",
135 name_of_reference_snapshot?
136 name_of_reference_snapshot : "(none)",
137 hook_status_description[snapshot_creation_status],
138 hook_status_description[snapshot_removal_status]
139 );
140 if (create_pid != 0)
141 fprintf(log,
142 "create_pid: %" PRId32 "\n"
143 "create process is %sstopped\n"
144 ,
145 create_pid,
146 create_process_stopped? "" : "not "
147 );
148 if (remove_pid != 0)
149 fprintf(log, "remove_pid: %" PRId32 "\n", remove_pid);
150 if (next_snapshot_time != 0)
151 fprintf(log, "next snapshot due in %" PRId64 " seconds\n",
152 next_snapshot_time - now);
153 if (current_snapshot_creation_time != 0)
154 fprintf(log, "current_snapshot_creation_time: %"
155 PRId64 " (%" PRId64 " seconds ago)\n",
156 current_snapshot_creation_time,
157 now - current_snapshot_creation_time
158 );
159 if (next_removal_check.tv_sec != 0) {
160 fprintf(log, "next removal check: %llu (%llu seconds ago)\n",
161 (long long unsigned)next_removal_check.tv_sec,
162 now - (long long unsigned)next_removal_check.tv_sec
163 );
164
165 }
166 fprintf(log, "%s </%s config> %s\n", dash, msg, dash);
167 }
168
169 /* a litte cpp magic helps to DRY */
170 #define COMMANDS \
171 COMMAND(ls) \
172 COMMAND(create) \
173 COMMAND(prune) \
174 COMMAND(run) \
175 COMMAND(kill) \
176 COMMAND(reload) \
177
178 #define COMMAND(x) static int com_ ##x(void);
179 COMMANDS
180 #undef COMMAND
181 #define COMMAND(x) if (conf.x ##_given) return com_ ##x();
182 static int call_command_handler(void)
183 {
184 COMMANDS
185 DSS_EMERG_LOG(("BUG: did not find command handler\n"));
186 return -E_BUG;
187 }
188 #undef COMMAND
189 #undef COMMANDS
190
191 static int loglevel = -1;
192 static const char *location_file = NULL;
193 static int location_line = -1;
194 static const char *location_func = NULL;
195
196 void dss_log_set_params(int ll, const char *file, int line, const char *func)
197 {
198 loglevel = ll;
199 location_file = file;
200 location_line = line;
201 location_func = func;
202 }
203
204 /**
205 * The log function of dss.
206 *
207 * \param ll Loglevel.
208 * \param fml Usual format string.
209 *
210 * All DSS_XXX_LOG() macros use this function.
211 */
212 __printf_1_2 void dss_log(const char* fmt,...)
213 {
214 va_list argp;
215 FILE *outfd;
216 struct tm *tm;
217 time_t t1;
218 char str[255] = "";
219
220 if (loglevel < conf.loglevel_arg)
221 return;
222 outfd = logfile? logfile : stderr;
223 time(&t1);
224 tm = localtime(&t1);
225 strftime(str, sizeof(str), "%b %d %H:%M:%S", tm);
226 fprintf(outfd, "%s ", str);
227 if (conf.loglevel_arg <= INFO)
228 fprintf(outfd, "%i: ", loglevel);
229 #ifdef DSS_NO_FUNC_NAMES
230 fprintf(outfd, "%s:%d: ", location_file, location_line);
231 #else
232 fprintf(outfd, "%s: ", location_func);
233 #endif
234 va_start(argp, fmt);
235 vfprintf(outfd, fmt, argp);
236 va_end(argp);
237 }
238
239 /**
240 * Print a message either to stdout or to the log file.
241 */
242 static __printf_1_2 void dss_msg(const char* fmt,...)
243 {
244 FILE *outfd = conf.daemon_given? logfile : stdout;
245 va_list argp;
246 va_start(argp, fmt);
247 vfprintf(outfd, fmt, argp);
248 va_end(argp);
249 }
250
251 static char *get_config_file_name(void)
252 {
253 char *home, *config_file;
254
255 if (conf.config_file_given)
256 return dss_strdup(conf.config_file_arg);
257 home = get_homedir();
258 config_file = make_message("%s/.dssrc", home);
259 free(home);
260 return config_file;
261 }
262
263 static int send_signal(int sig)
264 {
265 pid_t pid;
266 char *config_file = get_config_file_name();
267 int ret = get_dss_pid(config_file, &pid);
268
269 free(config_file);
270 if (ret < 0)
271 return ret;
272 if (conf.dry_run_given) {
273 dss_msg("%d\n", (int)pid);
274 return 0;
275 }
276 ret = kill(pid, sig);
277 if (ret < 0)
278 return -ERRNO_TO_DSS_ERROR(errno);
279 return 1;
280 }
281
282 static int com_kill(void)
283 {
284 return send_signal(SIGTERM);
285 }
286
287 static int com_reload(void)
288 {
289 return send_signal(SIGHUP);
290 }
291
292 static void dss_get_snapshot_list(struct snapshot_list *sl)
293 {
294 get_snapshot_list(sl, conf.unit_interval_arg, conf.num_intervals_arg);
295 }
296
297 static int64_t compute_next_snapshot_time(void)
298 {
299 int64_t x = 0, now = get_current_time(), unit_interval
300 = 24 * 3600 * conf.unit_interval_arg, ret;
301 unsigned wanted = desired_number_of_snapshots(0, conf.num_intervals_arg),
302 num_complete_snapshots = 0;
303 int i;
304 struct snapshot *s = NULL;
305 struct snapshot_list sl;
306
307 dss_get_snapshot_list(&sl);
308 FOR_EACH_SNAPSHOT(s, i, &sl) {
309 if (!(s->flags & SS_COMPLETE))
310 continue;
311 num_complete_snapshots++;
312 x += s->completion_time - s->creation_time;
313 }
314 assert(x >= 0);
315
316 ret = now;
317 if (num_complete_snapshots == 0)
318 goto out;
319 x /= num_complete_snapshots; /* avg time to create one snapshot */
320 if (unit_interval < x * wanted) /* oops, no sleep at all */
321 goto out;
322 ret = s->completion_time + unit_interval / wanted - x;
323 out:
324 free_snapshot_list(&sl);
325 return ret;
326 }
327
328 static inline void invalidate_next_snapshot_time(void)
329 {
330 next_snapshot_time = 0;
331 }
332
333 static inline int next_snapshot_time_is_valid(void)
334 {
335 return next_snapshot_time != 0;
336 }
337
338 static int next_snapshot_is_due(void)
339 {
340 int64_t now = get_current_time();
341
342 if (!next_snapshot_time_is_valid())
343 next_snapshot_time = compute_next_snapshot_time();
344 if (next_snapshot_time <= now) {
345 DSS_DEBUG_LOG(("next snapshot: now\n"));
346 return 1;
347 }
348 DSS_DEBUG_LOG(("next snapshot due in %" PRId64 " seconds\n",
349 next_snapshot_time - now));
350 return 0;
351 }
352
353 static void pre_create_hook(void)
354 {
355 assert(snapshot_creation_status == HS_READY);
356 /* make sure that the next snapshot time will be recomputed */
357 invalidate_next_snapshot_time();
358 DSS_DEBUG_LOG(("executing %s\n", conf.pre_create_hook_arg));
359 dss_exec_cmdline_pid(&create_pid, conf.pre_create_hook_arg);
360 snapshot_creation_status = HS_PRE_RUNNING;
361 }
362
363 static void pre_remove_hook(struct snapshot *s, const char *why)
364 {
365 char *cmd;
366
367 if (!s)
368 return;
369 DSS_DEBUG_LOG(("%s snapshot %s\n", why, s->name));
370 assert(snapshot_removal_status == HS_READY);
371 assert(remove_pid == 0);
372 assert(!snapshot_currently_being_removed);
373
374 snapshot_currently_being_removed = dss_malloc(sizeof(struct snapshot));
375 *snapshot_currently_being_removed = *s;
376 snapshot_currently_being_removed->name = dss_strdup(s->name);
377
378 cmd = make_message("%s %s/%s", conf.pre_remove_hook_arg,
379 conf.dest_dir_arg, s->name);
380 DSS_DEBUG_LOG(("executing %s\n", cmd));
381 dss_exec_cmdline_pid(&remove_pid, cmd);
382 free(cmd);
383 snapshot_removal_status = HS_PRE_RUNNING;
384 }
385
386 static int exec_rm(void)
387 {
388 struct snapshot *s = snapshot_currently_being_removed;
389 char *new_name = being_deleted_name(s);
390 char *argv[4];
391 int ret;
392
393 argv[0] = "rm";
394 argv[1] = "-rf";
395 argv[2] = new_name;
396 argv[3] = NULL;
397
398 assert(snapshot_removal_status == HS_PRE_SUCCESS);
399 assert(remove_pid == 0);
400
401 DSS_NOTICE_LOG(("removing %s (interval = %i)\n", s->name, s->interval));
402 ret = dss_rename(s->name, new_name);
403 if (ret < 0)
404 goto out;
405 dss_exec(&remove_pid, argv[0], argv);
406 snapshot_removal_status = HS_RUNNING;
407 out:
408 free(new_name);
409 return ret;
410 }
411
412 static int snapshot_is_being_created(struct snapshot *s)
413 {
414 return s->creation_time == current_snapshot_creation_time;
415 }
416
417 static struct snapshot *find_orphaned_snapshot(struct snapshot_list *sl)
418 {
419 struct snapshot *s;
420 int i;
421
422 DSS_DEBUG_LOG(("looking for orphaned snapshots\n"));
423 FOR_EACH_SNAPSHOT(s, i, sl) {
424 if (snapshot_is_being_created(s))
425 continue;
426 /*
427 * We know that no rm is currently running, so if s is marked
428 * as being deleted, a previously started rm must have failed.
429 */
430 if (s->flags & SS_BEING_DELETED)
431 return s;
432
433 if (s->flags & SS_COMPLETE) /* good snapshot */
434 continue;
435 /*
436 * This snapshot is incomplete and it is not the snapshot
437 * currently being created. However, we must not remove it if
438 * rsync is about to be restarted. As only the newest snapshot
439 * can be restarted, this snapshot is orphaned if it is not the
440 * newest snapshot or if we are not about to restart rsync.
441 */
442 if (get_newest_snapshot(sl) != s)
443 return s;
444 if (snapshot_creation_status != HS_NEEDS_RESTART)
445 return s;
446 }
447 /* no orphaned snapshots */
448 return NULL;
449 }
450
451 static int is_reference_snapshot(struct snapshot *s)
452 {
453 if (!name_of_reference_snapshot)
454 return 0;
455 return strcmp(s->name, name_of_reference_snapshot)? 0 : 1;
456 }
457
458 /*
459 * return: 0: no redundant snapshots, 1: rm process started, negative: error
460 */
461 static struct snapshot *find_redundant_snapshot(struct snapshot_list *sl)
462 {
463 int i, interval;
464 struct snapshot *s;
465 unsigned missing = 0;
466
467 DSS_DEBUG_LOG(("looking for intervals containing too many snapshots\n"));
468 for (interval = conf.num_intervals_arg - 1; interval >= 0; interval--) {
469 unsigned keep = desired_number_of_snapshots(interval, conf.num_intervals_arg);
470 unsigned num = sl->interval_count[interval];
471 struct snapshot *victim = NULL, *prev = NULL;
472 int64_t score = LONG_MAX;
473
474 if (keep >= num)
475 missing += keep - num;
476 if (keep + missing >= num)
477 continue;
478 /* redundant snapshot in this interval, pick snapshot with lowest score */
479 FOR_EACH_SNAPSHOT(s, i, sl) {
480 int64_t this_score;
481
482 if (snapshot_is_being_created(s))
483 continue;
484 if (is_reference_snapshot(s))
485 continue;
486 if (s->interval > interval) {
487 prev = s;
488 continue;
489 }
490 if (s->interval < interval)
491 break;
492 if (!victim) {
493 victim = s;
494 prev = s;
495 continue;
496 }
497 assert(prev);
498 /* check if s is a better victim */
499 this_score = s->creation_time - prev->creation_time;
500 assert(this_score >= 0);
501 if (this_score < score) {
502 score = this_score;
503 victim = s;
504 }
505 prev = s;
506 }
507 assert(victim);
508 return victim;
509 }
510 return NULL;
511 }
512
513 static struct snapshot *find_outdated_snapshot(struct snapshot_list *sl)
514 {
515 int i;
516 struct snapshot *s;
517
518 DSS_DEBUG_LOG(("looking for snapshots belonging to intervals >= %d\n",
519 conf.num_intervals_arg));
520 FOR_EACH_SNAPSHOT(s, i, sl) {
521 if (snapshot_is_being_created(s))
522 continue;
523 if (is_reference_snapshot(s))
524 continue;
525 if (s->interval < conf.num_intervals_arg)
526 continue;
527 return s;
528 }
529 return NULL;
530 }
531
532 static struct snapshot *find_oldest_removable_snapshot(struct snapshot_list *sl)
533 {
534 int i, num_complete;
535 struct snapshot *s, *ref = NULL;
536
537 num_complete = num_complete_snapshots(sl);
538 if (num_complete <= conf.min_complete_arg)
539 return NULL;
540 FOR_EACH_SNAPSHOT(s, i, sl) {
541 if (snapshot_is_being_created(s))
542 continue;
543 if (is_reference_snapshot(s)) { /* avoid this one */
544 ref = s;
545 continue;
546 }
547 DSS_INFO_LOG(("oldest removable snapshot: %s\n", s->name));
548 return s;
549 }
550 assert(ref);
551 DSS_WARNING_LOG(("removing reference snapshot %s\n", ref->name));
552 return ref;
553 }
554
555 static int rename_incomplete_snapshot(int64_t start)
556 {
557 char *old_name;
558 int ret;
559 int64_t now;
560
561 /*
562 * We don't want the dss_rename() below to fail with EEXIST because the
563 * last complete snapshot was created (and completed) in the same
564 * second as this one.
565 */
566 while ((now = get_current_time()) == start)
567 sleep(1);
568 free(path_to_last_complete_snapshot);
569 ret = complete_name(start, now, &path_to_last_complete_snapshot);
570 if (ret < 0)
571 return ret;
572 old_name = incomplete_name(start);
573 ret = dss_rename(old_name, path_to_last_complete_snapshot);
574 if (ret >= 0)
575 DSS_NOTICE_LOG(("%s -> %s\n", old_name,
576 path_to_last_complete_snapshot));
577 free(old_name);
578 return ret;
579 }
580
581 static int try_to_free_disk_space(void)
582 {
583 int ret;
584 struct snapshot_list sl;
585 struct snapshot *victim;
586 struct timeval now;
587 const char *why;
588 int low_disk_space;
589
590 ret = disk_space_low(NULL);
591 if (ret < 0)
592 return ret;
593 low_disk_space = ret;
594 gettimeofday(&now, NULL);
595 if (tv_diff(&next_removal_check, &now, NULL) > 0)
596 return 0;
597 if (!low_disk_space) {
598 if (conf.keep_redundant_given)
599 return 0;
600 if (snapshot_creation_status != HS_READY)
601 return 0;
602 if (next_snapshot_is_due())
603 return 0;
604 }
605 dss_get_snapshot_list(&sl);
606 ret = 0;
607 if (!low_disk_space && sl.num_snapshots <= 1)
608 goto out;
609 why = "outdated";
610 victim = find_outdated_snapshot(&sl);
611 if (victim)
612 goto remove;
613 why = "redundant";
614 victim = find_redundant_snapshot(&sl);
615 if (victim)
616 goto remove;
617 /* try harder only if disk space is low */
618 if (!low_disk_space)
619 goto out;
620 why = "orphaned";
621 victim = find_orphaned_snapshot(&sl);
622 if (victim)
623 goto remove;
624 DSS_WARNING_LOG(("disk space low and nothing obvious to remove\n"));
625 victim = find_oldest_removable_snapshot(&sl);
626 if (victim)
627 goto remove;
628 DSS_CRIT_LOG(("uhuhu: disk space low and nothing to remove\n"));
629 ret = -ERRNO_TO_DSS_ERROR(ENOSPC);
630 goto out;
631 remove:
632 pre_remove_hook(victim, why);
633 out:
634 free_snapshot_list(&sl);
635 return ret;
636 }
637
638 static void post_create_hook(void)
639 {
640 char *cmd = make_message("%s %s/%s", conf.post_create_hook_arg,
641 conf.dest_dir_arg, path_to_last_complete_snapshot);
642 DSS_NOTICE_LOG(("executing %s\n", cmd));
643 dss_exec_cmdline_pid(&create_pid, cmd);
644 free(cmd);
645 snapshot_creation_status = HS_POST_RUNNING;
646 }
647
648 static void post_remove_hook(void)
649 {
650 char *cmd;
651 struct snapshot *s = snapshot_currently_being_removed;
652
653 assert(s);
654
655 cmd = make_message("%s %s/%s", conf.post_remove_hook_arg,
656 conf.dest_dir_arg, s->name);
657 DSS_NOTICE_LOG(("executing %s\n", cmd));
658 dss_exec_cmdline_pid(&remove_pid, cmd);
659 free(cmd);
660 snapshot_removal_status = HS_POST_RUNNING;
661 }
662
663 static void dss_kill(pid_t pid, int sig, const char *msg)
664 {
665 const char *signame, *process_name;
666
667 if (pid == 0)
668 return;
669 switch (sig) {
670 case SIGTERM: signame = "TERM"; break;
671 case SIGSTOP: signame = "STOP"; break;
672 case SIGCONT: signame = "CONT"; break;
673 default: signame = "????";
674 }
675
676 if (pid == create_pid)
677 process_name = "create";
678 else if (pid == remove_pid)
679 process_name = "remove";
680 else process_name = "??????";
681
682 if (msg)
683 DSS_INFO_LOG(("%s\n", msg));
684 DSS_DEBUG_LOG(("sending signal %d (%s) to pid %d (%s process)\n",
685 sig, signame, (int)pid, process_name));
686 if (kill(pid, sig) >= 0)
687 return;
688 DSS_INFO_LOG(("failed to send signal %d (%s) to pid %d (%s process)\n",
689 sig, signame, (int)pid, process_name));
690 }
691
692 static void stop_create_process(void)
693 {
694 if (create_process_stopped)
695 return;
696 dss_kill(create_pid, SIGSTOP, "suspending create process");
697 create_process_stopped = 1;
698 }
699
700 static void restart_create_process(void)
701 {
702 if (!create_process_stopped)
703 return;
704 dss_kill(create_pid, SIGCONT, "resuming create process");
705 create_process_stopped = 0;
706 }
707
708 /**
709 * Print a log message about the exit status of a child.
710 */
711 static void log_termination_msg(pid_t pid, int status)
712 {
713 if (WIFEXITED(status))
714 DSS_INFO_LOG(("child %i exited. Exit status: %i\n", (int)pid,
715 WEXITSTATUS(status)));
716 else if (WIFSIGNALED(status))
717 DSS_NOTICE_LOG(("child %i was killed by signal %i\n", (int)pid,
718 WTERMSIG(status)));
719 else
720 DSS_WARNING_LOG(("child %i terminated abormally\n", (int)pid));
721 }
722
723 static int wait_for_process(pid_t pid, int *status)
724 {
725 int ret;
726
727 DSS_DEBUG_LOG(("Waiting for process %d to terminate\n", (int)pid));
728 for (;;) {
729 fd_set rfds;
730
731 FD_ZERO(&rfds);
732 FD_SET(signal_pipe, &rfds);
733 ret = dss_select(signal_pipe + 1, &rfds, NULL, NULL);
734 if (ret < 0)
735 break;
736 ret = next_signal();
737 if (!ret)
738 continue;
739 if (ret == SIGCHLD) {
740 ret = waitpid(pid, status, 0);
741 if (ret >= 0)
742 break;
743 if (errno != EINTR) { /* error */
744 ret = -ERRNO_TO_DSS_ERROR(errno);
745 break;
746 }
747 }
748 /* SIGINT or SIGTERM */
749 dss_kill(pid, SIGTERM, "killing child process");
750 }
751 if (ret < 0)
752 DSS_ERROR_LOG(("failed to wait for process %d\n", (int)pid));
753 else
754 log_termination_msg(pid, *status);
755 return ret;
756 }
757
758 static void handle_pre_remove_exit(int status)
759 {
760 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
761 snapshot_removal_status = HS_READY;
762 gettimeofday(&next_removal_check, NULL);
763 next_removal_check.tv_sec += 60;
764 return;
765 }
766 snapshot_removal_status = HS_PRE_SUCCESS;
767 }
768
769 static int handle_rm_exit(int status)
770 {
771 if (!WIFEXITED(status)) {
772 snapshot_removal_status = HS_READY;
773 return -E_INVOLUNTARY_EXIT;
774 }
775 if (WEXITSTATUS(status)) {
776 snapshot_removal_status = HS_READY;
777 return -E_BAD_EXIT_CODE;
778 }
779 snapshot_removal_status = HS_SUCCESS;
780 return 1;
781 }
782
783 static void handle_post_remove_exit(void)
784 {
785 snapshot_removal_status = HS_READY;
786 }
787
788 static int handle_remove_exit(int status)
789 {
790 int ret;
791 struct snapshot *s = snapshot_currently_being_removed;
792
793 assert(s);
794 switch (snapshot_removal_status) {
795 case HS_PRE_RUNNING:
796 handle_pre_remove_exit(status);
797 ret = 1;
798 break;
799 case HS_RUNNING:
800 ret = handle_rm_exit(status);
801 break;
802 case HS_POST_RUNNING:
803 handle_post_remove_exit();
804 ret = 1;
805 break;
806 default:
807 ret = -E_BUG;
808 }
809 if (snapshot_removal_status == HS_READY) {
810 free(s->name);
811 free(s);
812 snapshot_currently_being_removed = NULL;
813 }
814 remove_pid = 0;
815 return ret;
816 }
817
818 static int wait_for_remove_process(void)
819 {
820 int status, ret;
821
822 assert(remove_pid);
823 assert(
824 snapshot_removal_status == HS_PRE_RUNNING ||
825 snapshot_removal_status == HS_RUNNING ||
826 snapshot_removal_status == HS_POST_RUNNING
827 );
828 ret = wait_for_process(remove_pid, &status);
829 if (ret < 0)
830 return ret;
831 return handle_remove_exit(status);
832 }
833
834 static int handle_rsync_exit(int status)
835 {
836 int es, ret;
837
838 if (!WIFEXITED(status)) {
839 DSS_ERROR_LOG(("rsync process %d died involuntary\n", (int)create_pid));
840 ret = -E_INVOLUNTARY_EXIT;
841 snapshot_creation_status = HS_READY;
842 goto out;
843 }
844 es = WEXITSTATUS(status);
845 /*
846 * Restart rsync on non-fatal errors:
847 * 12: Error in rsync protocol data stream
848 * 13: Errors with program diagnostics
849 */
850 if (es == 12 || es == 13) {
851 DSS_WARNING_LOG(("rsync process %d returned %d -- restarting\n",
852 (int)create_pid, es));
853 snapshot_creation_status = HS_NEEDS_RESTART;
854 next_snapshot_time = get_current_time() + 60;
855 ret = 1;
856 goto out;
857 }
858 if (es != 0 && es != 23 && es != 24) {
859 DSS_ERROR_LOG(("rsync process %d returned %d\n", (int)create_pid, es));
860 ret = -E_BAD_EXIT_CODE;
861 snapshot_creation_status = HS_READY;
862 goto out;
863 }
864 ret = rename_incomplete_snapshot(current_snapshot_creation_time);
865 if (ret < 0)
866 goto out;
867 snapshot_creation_status = HS_SUCCESS;
868 free(name_of_reference_snapshot);
869 name_of_reference_snapshot = NULL;
870 out:
871 create_process_stopped = 0;
872 return ret;
873 }
874
875 static int handle_pre_create_hook_exit(int status)
876 {
877 int es, ret;
878 static int warn_count;
879
880 if (!WIFEXITED(status)) {
881 snapshot_creation_status = HS_READY;
882 ret = -E_INVOLUNTARY_EXIT;
883 goto out;
884 }
885 es = WEXITSTATUS(status);
886 if (es) {
887 if (!warn_count--) {
888 DSS_NOTICE_LOG(("pre_create_hook %s returned %d\n",
889 conf.pre_create_hook_arg, es));
890 DSS_NOTICE_LOG(("deferring snapshot creation...\n"));
891 warn_count = 60; /* warn only once per hour */
892 }
893 next_snapshot_time = get_current_time() + 60;
894 snapshot_creation_status = HS_READY;
895 ret = 0;
896 goto out;
897 }
898 warn_count = 0;
899 snapshot_creation_status = HS_PRE_SUCCESS;
900 ret = 1;
901 out:
902 return ret;
903 }
904
905 static int handle_sigchld(void)
906 {
907 pid_t pid;
908 int status, ret = reap_child(&pid, &status);
909
910 if (ret <= 0)
911 return ret;
912
913 if (pid == create_pid) {
914 switch (snapshot_creation_status) {
915 case HS_PRE_RUNNING:
916 ret = handle_pre_create_hook_exit(status);
917 break;
918 case HS_RUNNING:
919 ret = handle_rsync_exit(status);
920 break;
921 case HS_POST_RUNNING:
922 snapshot_creation_status = HS_READY;
923 ret = 1;
924 break;
925 default:
926 DSS_EMERG_LOG(("BUG: create can't die in status %d\n",
927 snapshot_creation_status));
928 return -E_BUG;
929 }
930 create_pid = 0;
931 return ret;
932 }
933 if (pid == remove_pid) {
934 ret = handle_remove_exit(status);
935 if (ret < 0)
936 return ret;
937 return ret;
938 }
939 DSS_EMERG_LOG(("BUG: unknown process %d died\n", (int)pid));
940 return -E_BUG;
941 }
942
943 static int check_config(void)
944 {
945 if (conf.unit_interval_arg <= 0) {
946 DSS_ERROR_LOG(("bad unit interval: %i\n", conf.unit_interval_arg));
947 return -E_INVALID_NUMBER;
948 }
949 DSS_DEBUG_LOG(("unit interval: %i day(s)\n", conf.unit_interval_arg));
950 if (conf.num_intervals_arg <= 0 || conf.num_intervals_arg > 30) {
951 DSS_ERROR_LOG(("bad number of intervals: %i\n",
952 conf.num_intervals_arg));
953 return -E_INVALID_NUMBER;
954 }
955 DSS_DEBUG_LOG(("number of intervals: %i\n", conf.num_intervals_arg));
956 return 1;
957 }
958
959 /*
960 * Returns < 0 on errors, 0 if no config file is given and > 0 if the config
961 * file was read successfully.
962 */
963 static int parse_config_file(int override)
964 {
965 int ret, config_file_exists;
966 char *config_file = get_config_file_name();
967 struct stat statbuf;
968 char *old_logfile_arg = NULL;
969 int old_daemon_given = 0;
970
971 if (override) { /* SIGHUP */
972 if (conf.logfile_given)
973 old_logfile_arg = dss_strdup(conf.logfile_arg);
974 old_daemon_given = conf.daemon_given;
975 }
976
977 config_file_exists = !stat(config_file, &statbuf);
978 if (!config_file_exists && conf.config_file_given) {
979 ret = -ERRNO_TO_DSS_ERROR(errno);
980 DSS_ERROR_LOG(("failed to stat config file %s\n", config_file));
981 goto out;
982 }
983 if (config_file_exists) {
984 struct cmdline_parser_params params;
985 params.override = override;
986 params.initialize = 0;
987 params.check_required = 1;
988 params.check_ambiguity = 0;
989 params.print_errors = 1;
990 if (override) { /* invalidate all rsync options */
991 int i;
992
993 for (i = 0; i < conf.rsync_option_given; i++) {
994 free(conf.rsync_option_arg[i]);
995 conf.rsync_option_arg[i] = NULL;
996 }
997 conf.rsync_option_given = 0;
998 }
999 cmdline_parser_config_file(config_file, &conf, &params);
1000 }
1001 ret = check_config();
1002 if (ret < 0)
1003 goto out;
1004 if (override) {
1005 /* don't change daemon mode on SIGHUP */
1006 conf.daemon_given = old_daemon_given;
1007 close_log(logfile);
1008 logfile = NULL;
1009 if (conf.logfile_given)
1010 free(old_logfile_arg);
1011 else if (conf.daemon_given) { /* re-use old logfile */
1012 conf.logfile_arg = old_logfile_arg;
1013 conf.logfile_given = 1;
1014 }
1015 }
1016 if (conf.logfile_given && conf.run_given && conf.daemon_given) {
1017 logfile = open_log(conf.logfile_arg);
1018 log_welcome(conf.loglevel_arg);
1019 }
1020 DSS_DEBUG_LOG(("loglevel: %d\n", conf.loglevel_arg));
1021 ret = config_file_exists;
1022 out:
1023 free(config_file);
1024 if (ret < 0)
1025 DSS_EMERG_LOG(("%s\n", dss_strerror(-ret)));
1026 return ret;
1027 }
1028
1029 static int change_to_dest_dir(void)
1030 {
1031 DSS_INFO_LOG(("changing cwd to %s\n", conf.dest_dir_arg));
1032 return dss_chdir(conf.dest_dir_arg);
1033 }
1034
1035 static int handle_sighup(void)
1036 {
1037 int ret;
1038
1039 DSS_NOTICE_LOG(("SIGHUP, re-reading config\n"));
1040 dump_dss_config("old");
1041 ret = parse_config_file(1);
1042 if (ret < 0)
1043 return ret;
1044 dump_dss_config("reloaded");
1045 invalidate_next_snapshot_time();
1046 return change_to_dest_dir();
1047 }
1048
1049 static void kill_children(void)
1050 {
1051 restart_create_process();
1052 dss_kill(create_pid, SIGTERM, NULL);
1053 dss_kill(remove_pid, SIGTERM, NULL);
1054 }
1055
1056 static int handle_signal(void)
1057 {
1058 int sig, ret = next_signal();
1059
1060 if (ret <= 0)
1061 goto out;
1062 sig = ret;
1063 switch (sig) {
1064 case SIGINT:
1065 case SIGTERM:
1066 kill_children();
1067 ret = -E_SIGNAL;
1068 break;
1069 case SIGHUP:
1070 ret = handle_sighup();
1071 break;
1072 case SIGCHLD:
1073 ret = handle_sigchld();
1074 break;
1075 }
1076 out:
1077 if (ret < 0)
1078 DSS_ERROR_LOG(("%s\n", dss_strerror(-ret)));
1079 return ret;
1080 }
1081
1082 /*
1083 * We can not use rsync locally if the local user is different from the remote
1084 * user or if the src dir is not on the local host (or both).
1085 */
1086 static int use_rsync_locally(char *logname)
1087 {
1088 char *h = conf.remote_host_arg;
1089
1090 if (strcmp(h, "localhost") && strcmp(h, "127.0.0.1"))
1091 return 0;
1092 if (conf.remote_user_given && strcmp(conf.remote_user_arg, logname))
1093 return 0;
1094 return 1;
1095 }
1096
1097 static int rename_resume_snap(int64_t creation_time)
1098 {
1099 struct snapshot_list sl;
1100 struct snapshot *s = NULL;
1101 char *new_name = incomplete_name(creation_time);
1102 int ret;
1103 const char *why;
1104
1105 sl.num_snapshots = 0;
1106
1107 ret = 0;
1108 if (conf.no_resume_given)
1109 goto out;
1110 dss_get_snapshot_list(&sl);
1111 /*
1112 * Snapshot recycling: We first look at the newest snapshot. If this
1113 * snapshot happens to be incomplete, the last rsync process was
1114 * aborted and we reuse this one. Otherwise we look at snapshots which
1115 * could be removed (outdated and redundant snapshots) as candidates
1116 * for recycling. If no outdated/redundant snapshot exists, we check if
1117 * there is an orphaned snapshot, which likely is useless anyway.
1118 *
1119 * Only if no existing snapshot is suitable for recycling, we bite the
1120 * bullet and create a new one.
1121 */
1122 s = get_newest_snapshot(&sl);
1123 if (!s) /* no snapshots at all */
1124 goto out;
1125 /* re-use last snapshot if it is incomplete */
1126 why = "aborted";
1127 if ((s->flags & SS_COMPLETE) == 0)
1128 goto out;
1129 why = "outdated";
1130 s = find_outdated_snapshot(&sl);
1131 if (s)
1132 goto out;
1133 why = "redundant";
1134 s = find_redundant_snapshot(&sl);
1135 if (s)
1136 goto out;
1137 why = "orphaned";
1138 s = find_orphaned_snapshot(&sl);
1139 out:
1140 if (s) {
1141 DSS_INFO_LOG(("reusing %s snapshot %s\n", why, s->name));
1142 ret = dss_rename(s->name, new_name);
1143 }
1144 if (ret >= 0)
1145 DSS_NOTICE_LOG(("creating new snapshot %s\n", new_name));
1146 free(new_name);
1147 free_snapshot_list(&sl);
1148 return ret;
1149 }
1150
1151 static void create_rsync_argv(char ***argv, int64_t *num)
1152 {
1153 char *logname;
1154 int i = 0, j;
1155 struct snapshot_list sl;
1156
1157 dss_get_snapshot_list(&sl);
1158 assert(!name_of_reference_snapshot);
1159 name_of_reference_snapshot = name_of_newest_complete_snapshot(&sl);
1160 free_snapshot_list(&sl);
1161
1162 *argv = dss_malloc((15 + conf.rsync_option_given) * sizeof(char *));
1163 (*argv)[i++] = dss_strdup("rsync");
1164 (*argv)[i++] = dss_strdup("-a");
1165 (*argv)[i++] = dss_strdup("--delete");
1166 for (j = 0; j < conf.rsync_option_given; j++)
1167 (*argv)[i++] = dss_strdup(conf.rsync_option_arg[j]);
1168 if (name_of_reference_snapshot) {
1169 DSS_INFO_LOG(("using %s as reference\n", name_of_reference_snapshot));
1170 (*argv)[i++] = make_message("--link-dest=../%s",
1171 name_of_reference_snapshot);
1172 } else
1173 DSS_INFO_LOG(("no suitable reference snapshot found\n"));
1174 logname = dss_logname();
1175 if (use_rsync_locally(logname))
1176 (*argv)[i++] = dss_strdup(conf.source_dir_arg);
1177 else
1178 (*argv)[i++] = make_message("%s@%s:%s/", conf.remote_user_given?
1179 conf.remote_user_arg : logname,
1180 conf.remote_host_arg, conf.source_dir_arg);
1181 free(logname);
1182 *num = get_current_time();
1183 (*argv)[i++] = incomplete_name(*num);
1184 (*argv)[i++] = NULL;
1185 for (j = 0; j < i; j++)
1186 DSS_DEBUG_LOG(("argv[%d] = %s\n", j, (*argv)[j]));
1187 }
1188
1189 static void free_rsync_argv(char **argv)
1190 {
1191 int i;
1192
1193 if (!argv)
1194 return;
1195 for (i = 0; argv[i]; i++)
1196 free(argv[i]);
1197 free(argv);
1198 }
1199
1200 static int create_snapshot(char **argv)
1201 {
1202 int ret;
1203
1204 ret = rename_resume_snap(current_snapshot_creation_time);
1205 if (ret < 0)
1206 return ret;
1207 dss_exec(&create_pid, argv[0], argv);
1208 snapshot_creation_status = HS_RUNNING;
1209 return ret;
1210 }
1211
1212 static int select_loop(void)
1213 {
1214 int ret;
1215 /* check every 60 seconds for free disk space */
1216 struct timeval tv;
1217 char **rsync_argv = NULL;
1218
1219 for (;;) {
1220 fd_set rfds;
1221 struct timeval *tvp;
1222
1223 if (remove_pid)
1224 tvp = NULL; /* sleep until rm hook/process dies */
1225 else { /* sleep one minute */
1226 tv.tv_sec = 60;
1227 tv.tv_usec = 0;
1228 tvp = &tv;
1229 }
1230 FD_ZERO(&rfds);
1231 FD_SET(signal_pipe, &rfds);
1232 ret = dss_select(signal_pipe + 1, &rfds, NULL, tvp);
1233 if (ret < 0)
1234 goto out;
1235 if (FD_ISSET(signal_pipe, &rfds)) {
1236 ret = handle_signal();
1237 if (ret < 0)
1238 goto out;
1239 }
1240 if (remove_pid)
1241 continue;
1242 if (snapshot_removal_status == HS_PRE_SUCCESS) {
1243 ret = exec_rm();
1244 if (ret < 0)
1245 goto out;
1246 continue;
1247 }
1248 if (snapshot_removal_status == HS_SUCCESS) {
1249 post_remove_hook();
1250 continue;
1251 }
1252 ret = try_to_free_disk_space();
1253 if (ret < 0)
1254 goto out;
1255 if (snapshot_removal_status != HS_READY) {
1256 stop_create_process();
1257 continue;
1258 }
1259 restart_create_process();
1260 switch (snapshot_creation_status) {
1261 case HS_READY:
1262 if (!next_snapshot_is_due())
1263 continue;
1264 pre_create_hook();
1265 continue;
1266 case HS_PRE_RUNNING:
1267 case HS_RUNNING:
1268 case HS_POST_RUNNING:
1269 continue;
1270 case HS_PRE_SUCCESS:
1271 if (!name_of_reference_snapshot) {
1272 free_rsync_argv(rsync_argv);
1273 create_rsync_argv(&rsync_argv, &current_snapshot_creation_time);
1274 }
1275 ret = create_snapshot(rsync_argv);
1276 if (ret < 0)
1277 goto out;
1278 continue;
1279 case HS_NEEDS_RESTART:
1280 if (!next_snapshot_is_due())
1281 continue;
1282 ret = create_snapshot(rsync_argv);
1283 if (ret < 0)
1284 goto out;
1285 continue;
1286 case HS_SUCCESS:
1287 post_create_hook();
1288 continue;
1289 }
1290 }
1291 out:
1292 return ret;
1293 }
1294
1295 static void exit_hook(int exit_code)
1296 {
1297 char *argv[3];
1298 pid_t pid;
1299
1300 argv[0] = conf.exit_hook_arg;
1301 argv[1] = dss_strerror(-exit_code);
1302 argv[2] = NULL;
1303
1304 DSS_NOTICE_LOG(("executing %s %s\n", argv[0], argv[1]));
1305 dss_exec(&pid, conf.exit_hook_arg, argv);
1306 }
1307
1308 static void lock_dss_or_die(void)
1309 {
1310 char *config_file = get_config_file_name();
1311 int ret = lock_dss(config_file);
1312
1313 free(config_file);
1314 if (ret < 0) {
1315 DSS_EMERG_LOG(("failed to lock: %s\n", dss_strerror(-ret)));
1316 exit(EXIT_FAILURE);
1317 }
1318 }
1319
1320 static int com_run(void)
1321 {
1322 int ret;
1323
1324 lock_dss_or_die();
1325 if (conf.dry_run_given) {
1326 DSS_ERROR_LOG(("dry_run not supported by this command\n"));
1327 return -E_SYNTAX;
1328 }
1329 ret = install_sighandler(SIGHUP);
1330 if (ret < 0)
1331 return ret;
1332 ret = select_loop();
1333 if (ret >= 0) /* impossible */
1334 ret = -E_BUG;
1335 kill_children();
1336 exit_hook(ret);
1337 return ret;
1338 }
1339
1340 static int com_prune(void)
1341 {
1342 int ret;
1343 struct snapshot_list sl;
1344 struct snapshot *victim;
1345 struct disk_space ds;
1346 const char *why;
1347
1348 lock_dss_or_die();
1349 ret = get_disk_space(".", &ds);
1350 if (ret < 0)
1351 return ret;
1352 log_disk_space(&ds);
1353 dss_get_snapshot_list(&sl);
1354 why = "outdated";
1355 victim = find_outdated_snapshot(&sl);
1356 if (victim)
1357 goto rm;
1358 why = "redundant";
1359 victim = find_redundant_snapshot(&sl);
1360 if (victim)
1361 goto rm;
1362 ret = 0;
1363 goto out;
1364 rm:
1365 if (conf.dry_run_given) {
1366 dss_msg("%s snapshot %s (interval = %i)\n",
1367 why, victim->name, victim->interval);
1368 ret = 0;
1369 goto out;
1370 }
1371 pre_remove_hook(victim, why);
1372 if (snapshot_removal_status == HS_PRE_RUNNING) {
1373 ret = wait_for_remove_process();
1374 if (ret < 0)
1375 goto out;
1376 if (snapshot_removal_status != HS_PRE_SUCCESS)
1377 goto out;
1378 }
1379 ret = exec_rm();
1380 if (ret < 0)
1381 goto out;
1382 ret = wait_for_remove_process();
1383 if (ret < 0)
1384 goto out;
1385 if (snapshot_removal_status != HS_SUCCESS)
1386 goto out;
1387 post_remove_hook();
1388 if (snapshot_removal_status != HS_POST_RUNNING)
1389 goto out;
1390 ret = wait_for_remove_process();
1391 if (ret < 0)
1392 goto out;
1393 ret = 1;
1394 out:
1395 free_snapshot_list(&sl);
1396 return ret;
1397 }
1398
1399 static int com_create(void)
1400 {
1401 int ret, status;
1402 char **rsync_argv;
1403
1404 lock_dss_or_die();
1405 if (conf.dry_run_given) {
1406 int i;
1407 char *msg = NULL;
1408 create_rsync_argv(&rsync_argv, &current_snapshot_creation_time);
1409 for (i = 0; rsync_argv[i]; i++) {
1410 char *tmp = msg;
1411 msg = make_message("%s%s%s", tmp? tmp : "",
1412 tmp? " " : "", rsync_argv[i]);
1413 free(tmp);
1414 }
1415 free_rsync_argv(rsync_argv);
1416 dss_msg("%s\n", msg);
1417 free(msg);
1418 return 1;
1419 }
1420 pre_create_hook();
1421 if (create_pid) {
1422 ret = wait_for_process(create_pid, &status);
1423 if (ret < 0)
1424 return ret;
1425 ret = handle_pre_create_hook_exit(status);
1426 if (ret <= 0) /* error, or pre-create failed */
1427 return ret;
1428 }
1429 create_rsync_argv(&rsync_argv, &current_snapshot_creation_time);
1430 ret = create_snapshot(rsync_argv);
1431 if (ret < 0)
1432 goto out;
1433 ret = wait_for_process(create_pid, &status);
1434 if (ret < 0)
1435 goto out;
1436 ret = handle_rsync_exit(status);
1437 if (ret < 0)
1438 goto out;
1439 post_create_hook();
1440 if (create_pid)
1441 ret = wait_for_process(create_pid, &status);
1442 out:
1443 free_rsync_argv(rsync_argv);
1444 return ret;
1445 }
1446
1447 static int com_ls(void)
1448 {
1449 int i;
1450 struct snapshot_list sl;
1451 struct snapshot *s;
1452
1453 dss_get_snapshot_list(&sl);
1454 FOR_EACH_SNAPSHOT(s, i, &sl) {
1455 int64_t d = 0;
1456 if (s->flags & SS_COMPLETE)
1457 d = (s->completion_time - s->creation_time) / 60;
1458 dss_msg("%u\t%s\t%3" PRId64 ":%02" PRId64 "\n", s->interval, s->name, d/60, d%60);
1459 }
1460 free_snapshot_list(&sl);
1461 return 1;
1462 }
1463
1464 static int setup_signal_handling(void)
1465 {
1466 int ret;
1467
1468 DSS_INFO_LOG(("setting up signal handlers\n"));
1469 signal_pipe = signal_init(); /* always successful */
1470 ret = install_sighandler(SIGINT);
1471 if (ret < 0)
1472 return ret;
1473 ret = install_sighandler(SIGTERM);
1474 if (ret < 0)
1475 return ret;
1476 return install_sighandler(SIGCHLD);
1477 }
1478
1479 /**
1480 * The main function of dss.
1481 *
1482 * \param argc Usual argument count.
1483 * \param argv Usual argument vector.
1484 */
1485 int main(int argc, char **argv)
1486 {
1487 int ret;
1488 struct cmdline_parser_params params;
1489
1490 params.override = 0;
1491 params.initialize = 1;
1492 params.check_required = 0;
1493 params.check_ambiguity = 0;
1494 params.print_errors = 1;
1495
1496 cmdline_parser_ext(argc, argv, &conf, &params); /* aborts on errors */
1497 ret = parse_config_file(0);
1498 if (ret < 0)
1499 goto out;
1500 if (ret == 0) { /* no config file given */
1501 /*
1502 * Parse the command line options again, but this time check
1503 * that all required options are given.
1504 */
1505 struct cmdline_parser_params params;
1506 params.override = 1;
1507 params.initialize = 1;
1508 params.check_required = 1;
1509 params.check_ambiguity = 1;
1510 params.print_errors = 1;
1511 cmdline_parser_ext(argc, argv, &conf, &params); /* aborts on errors */
1512 }
1513 if (conf.daemon_given)
1514 daemon_init();
1515 ret = change_to_dest_dir();
1516 if (ret < 0)
1517 goto out;
1518 dump_dss_config("startup");
1519 ret = setup_signal_handling();
1520 if (ret < 0)
1521 goto out;
1522 ret = call_command_handler();
1523 signal_shutdown();
1524 out:
1525 if (ret < 0)
1526 DSS_EMERG_LOG(("%s\n", dss_strerror(-ret)));
1527 exit(ret >= 0? EXIT_SUCCESS : EXIT_FAILURE);
1528 }