Always try to keep one snapshot for recycling.
[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 /** How many times in a row the rsync command failed. */
49 static int num_consecutive_rsync_errors;
50 /** Process id of current pre-remove/rm/post-remove process. */
51 static pid_t remove_pid;
52 /** When the next snapshot is due. */
53 static int64_t next_snapshot_time;
54 /** When to try to remove something. */
55 static struct timeval next_removal_check;
56 /** Creation time of the snapshot currently being created. */
57 static int64_t current_snapshot_creation_time;
58 /** The snapshot currently being removed. */
59 struct snapshot *snapshot_currently_being_removed;
60 /** Needed by the post-create hook. */
61 static char *path_to_last_complete_snapshot;
62 static char *name_of_reference_snapshot;
63 /** \sa \ref snap.h for details. */
64 enum hook_status snapshot_creation_status;
65 /** \sa \ref snap.h for details. */
66 enum hook_status snapshot_removal_status;
67
68
69 DEFINE_DSS_ERRLIST;
70 static const char *hook_status_description[] = {HOOK_STATUS_ARRAY};
71
72 /* may be called with ds == NULL. */
73 static int disk_space_low(struct disk_space *ds)
74 {
75 struct disk_space ds_struct;
76
77 if (!ds) {
78 int ret = get_disk_space(".", &ds_struct);
79 if (ret < 0)
80 return ret;
81 ds = &ds_struct;
82 }
83 if (conf.min_free_mb_arg)
84 if (ds->free_mb < conf.min_free_mb_arg)
85 return 1;
86 if (conf.min_free_percent_arg)
87 if (ds->percent_free < conf.min_free_percent_arg)
88 return 1;
89 if (conf.min_free_percent_inodes_arg)
90 if (ds->percent_free_inodes < conf.min_free_percent_inodes_arg)
91 return 1;
92 return 0;
93 }
94
95 static void dump_dss_config(const char *msg)
96 {
97 const char dash[] = "-----------------------------";
98 int ret;
99 FILE *log = logfile? logfile : stderr;
100 struct disk_space ds;
101 int64_t now = get_current_time();
102
103 if (conf.loglevel_arg > INFO)
104 return;
105
106 fprintf(log, "%s <%s config> %s\n", dash, msg, dash);
107 fprintf(log, "\n*** disk space ***\n\n");
108 ret = get_disk_space(".", &ds);
109 if (ret >= 0) {
110 DSS_INFO_LOG(("disk space low: %s\n", disk_space_low(&ds)?
111 "yes" : "no"));
112 log_disk_space(&ds);
113 } else
114 DSS_ERROR_LOG(("can not get free disk space: %s\n",
115 dss_strerror(-ret)));
116
117 /* we continue on errors from get_disk_space */
118
119 fprintf(log, "\n*** command line and config file options ***\n\n");
120 cmdline_parser_dump(log, &conf);
121 fprintf(log, "\n*** internal state ***\n\n");
122 fprintf(log,
123 "pid: %d\n"
124 "logile: %s\n"
125 "snapshot_currently_being_removed: %s\n"
126 "path_to_last_complete_snapshot: %s\n"
127 "reference_snapshot: %s\n"
128 "snapshot_creation_status: %s\n"
129 "snapshot_removal_status: %s\n"
130 "num_consecutive_rsync_errors: %d\n"
131 ,
132 (int) getpid(),
133 logfile? conf.logfile_arg : "stderr",
134 snapshot_currently_being_removed?
135 snapshot_currently_being_removed->name : "(none)",
136 path_to_last_complete_snapshot?
137 path_to_last_complete_snapshot : "(none)",
138 name_of_reference_snapshot?
139 name_of_reference_snapshot : "(none)",
140 hook_status_description[snapshot_creation_status],
141 hook_status_description[snapshot_removal_status],
142 num_consecutive_rsync_errors
143 );
144 if (create_pid != 0)
145 fprintf(log,
146 "create_pid: %" PRId32 "\n"
147 "create process is %sstopped\n"
148 ,
149 create_pid,
150 create_process_stopped? "" : "not "
151 );
152 if (remove_pid != 0)
153 fprintf(log, "remove_pid: %" PRId32 "\n", remove_pid);
154 if (next_snapshot_time != 0)
155 fprintf(log, "next snapshot due in %" PRId64 " seconds\n",
156 next_snapshot_time - now);
157 if (current_snapshot_creation_time != 0)
158 fprintf(log, "current_snapshot_creation_time: %"
159 PRId64 " (%" PRId64 " seconds ago)\n",
160 current_snapshot_creation_time,
161 now - current_snapshot_creation_time
162 );
163 if (next_removal_check.tv_sec != 0) {
164 fprintf(log, "next removal check: %llu (%llu seconds ago)\n",
165 (long long unsigned)next_removal_check.tv_sec,
166 now - (long long unsigned)next_removal_check.tv_sec
167 );
168
169 }
170 fprintf(log, "%s </%s config> %s\n", dash, msg, dash);
171 }
172
173 /* a litte cpp magic helps to DRY */
174 #define COMMANDS \
175 COMMAND(ls) \
176 COMMAND(create) \
177 COMMAND(prune) \
178 COMMAND(run) \
179 COMMAND(kill) \
180 COMMAND(reload) \
181
182 #define COMMAND(x) static int com_ ##x(void);
183 COMMANDS
184 #undef COMMAND
185 #define COMMAND(x) if (conf.x ##_given) return com_ ##x();
186 static int call_command_handler(void)
187 {
188 COMMANDS
189 DSS_EMERG_LOG(("BUG: did not find command handler\n"));
190 return -E_BUG;
191 }
192 #undef COMMAND
193 #undef COMMANDS
194
195 static int loglevel = -1;
196 static const char *location_file = NULL;
197 static int location_line = -1;
198 static const char *location_func = NULL;
199
200 void dss_log_set_params(int ll, const char *file, int line, const char *func)
201 {
202 loglevel = ll;
203 location_file = file;
204 location_line = line;
205 location_func = func;
206 }
207
208 /**
209 * The log function of dss.
210 *
211 * \param ll Loglevel.
212 * \param fml Usual format string.
213 *
214 * All DSS_XXX_LOG() macros use this function.
215 */
216 __printf_1_2 void dss_log(const char* fmt,...)
217 {
218 va_list argp;
219 FILE *outfd;
220 struct tm *tm;
221 time_t t1;
222 char str[255] = "";
223
224 if (loglevel < conf.loglevel_arg)
225 return;
226 outfd = logfile? logfile : stderr;
227 time(&t1);
228 tm = localtime(&t1);
229 strftime(str, sizeof(str), "%b %d %H:%M:%S", tm);
230 fprintf(outfd, "%s ", str);
231 if (conf.loglevel_arg <= INFO)
232 fprintf(outfd, "%i: ", loglevel);
233 #ifdef DSS_NO_FUNC_NAMES
234 fprintf(outfd, "%s:%d: ", location_file, location_line);
235 #else
236 fprintf(outfd, "%s: ", location_func);
237 #endif
238 va_start(argp, fmt);
239 vfprintf(outfd, fmt, argp);
240 va_end(argp);
241 }
242
243 /**
244 * Print a message either to stdout or to the log file.
245 */
246 static __printf_1_2 void dss_msg(const char* fmt,...)
247 {
248 FILE *outfd = conf.daemon_given? logfile : stdout;
249 va_list argp;
250 va_start(argp, fmt);
251 vfprintf(outfd, fmt, argp);
252 va_end(argp);
253 }
254
255 static char *get_config_file_name(void)
256 {
257 char *home, *config_file;
258
259 if (conf.config_file_given)
260 return dss_strdup(conf.config_file_arg);
261 home = get_homedir();
262 config_file = make_message("%s/.dssrc", home);
263 free(home);
264 return config_file;
265 }
266
267 static int send_signal(int sig)
268 {
269 pid_t pid;
270 char *config_file = get_config_file_name();
271 int ret = get_dss_pid(config_file, &pid);
272
273 free(config_file);
274 if (ret < 0)
275 return ret;
276 if (conf.dry_run_given) {
277 dss_msg("%d\n", (int)pid);
278 return 0;
279 }
280 ret = kill(pid, sig);
281 if (ret < 0)
282 return -ERRNO_TO_DSS_ERROR(errno);
283 return 1;
284 }
285
286 static int com_kill(void)
287 {
288 return send_signal(SIGTERM);
289 }
290
291 static int com_reload(void)
292 {
293 return send_signal(SIGHUP);
294 }
295
296 static void dss_get_snapshot_list(struct snapshot_list *sl)
297 {
298 get_snapshot_list(sl, conf.unit_interval_arg, conf.num_intervals_arg);
299 }
300
301 static int64_t compute_next_snapshot_time(void)
302 {
303 int64_t x = 0, now = get_current_time(), unit_interval
304 = 24 * 3600 * conf.unit_interval_arg, ret;
305 unsigned wanted = desired_number_of_snapshots(0, conf.num_intervals_arg),
306 num_complete_snapshots = 0;
307 int i;
308 struct snapshot *s = NULL;
309 struct snapshot_list sl;
310
311 dss_get_snapshot_list(&sl);
312 FOR_EACH_SNAPSHOT(s, i, &sl) {
313 if (!(s->flags & SS_COMPLETE))
314 continue;
315 num_complete_snapshots++;
316 x += s->completion_time - s->creation_time;
317 }
318 assert(x >= 0);
319
320 ret = now;
321 if (num_complete_snapshots == 0)
322 goto out;
323 x /= num_complete_snapshots; /* avg time to create one snapshot */
324 if (unit_interval < x * wanted) /* oops, no sleep at all */
325 goto out;
326 ret = s->completion_time + unit_interval / wanted - x;
327 out:
328 free_snapshot_list(&sl);
329 return ret;
330 }
331
332 static inline void invalidate_next_snapshot_time(void)
333 {
334 next_snapshot_time = 0;
335 }
336
337 static inline int next_snapshot_time_is_valid(void)
338 {
339 return next_snapshot_time != 0;
340 }
341
342 static int next_snapshot_is_due(void)
343 {
344 int64_t now = get_current_time();
345
346 if (!next_snapshot_time_is_valid())
347 next_snapshot_time = compute_next_snapshot_time();
348 if (next_snapshot_time <= now) {
349 DSS_DEBUG_LOG(("next snapshot: now\n"));
350 return 1;
351 }
352 DSS_DEBUG_LOG(("next snapshot due in %" PRId64 " seconds\n",
353 next_snapshot_time - now));
354 return 0;
355 }
356
357 static void pre_create_hook(void)
358 {
359 assert(snapshot_creation_status == HS_READY);
360 /* make sure that the next snapshot time will be recomputed */
361 invalidate_next_snapshot_time();
362 DSS_DEBUG_LOG(("executing %s\n", conf.pre_create_hook_arg));
363 dss_exec_cmdline_pid(&create_pid, conf.pre_create_hook_arg);
364 snapshot_creation_status = HS_PRE_RUNNING;
365 }
366
367 static void pre_remove_hook(struct snapshot *s, const char *why)
368 {
369 char *cmd;
370
371 if (!s)
372 return;
373 DSS_DEBUG_LOG(("%s snapshot %s\n", why, s->name));
374 assert(snapshot_removal_status == HS_READY);
375 assert(remove_pid == 0);
376 assert(!snapshot_currently_being_removed);
377
378 snapshot_currently_being_removed = dss_malloc(sizeof(struct snapshot));
379 *snapshot_currently_being_removed = *s;
380 snapshot_currently_being_removed->name = dss_strdup(s->name);
381
382 cmd = make_message("%s %s/%s", conf.pre_remove_hook_arg,
383 conf.dest_dir_arg, s->name);
384 DSS_DEBUG_LOG(("executing %s\n", cmd));
385 dss_exec_cmdline_pid(&remove_pid, cmd);
386 free(cmd);
387 snapshot_removal_status = HS_PRE_RUNNING;
388 }
389
390 static int exec_rm(void)
391 {
392 struct snapshot *s = snapshot_currently_being_removed;
393 char *new_name = being_deleted_name(s);
394 char *argv[4];
395 int ret;
396
397 argv[0] = "rm";
398 argv[1] = "-rf";
399 argv[2] = new_name;
400 argv[3] = NULL;
401
402 assert(snapshot_removal_status == HS_PRE_SUCCESS);
403 assert(remove_pid == 0);
404
405 DSS_NOTICE_LOG(("removing %s (interval = %i)\n", s->name, s->interval));
406 ret = dss_rename(s->name, new_name);
407 if (ret < 0)
408 goto out;
409 dss_exec(&remove_pid, argv[0], argv);
410 snapshot_removal_status = HS_RUNNING;
411 out:
412 free(new_name);
413 return ret;
414 }
415
416 static int snapshot_is_being_created(struct snapshot *s)
417 {
418 return s->creation_time == current_snapshot_creation_time;
419 }
420
421 static struct snapshot *find_orphaned_snapshot(struct snapshot_list *sl)
422 {
423 struct snapshot *s;
424 int i;
425
426 DSS_DEBUG_LOG(("looking for orphaned snapshots\n"));
427 FOR_EACH_SNAPSHOT(s, i, sl) {
428 if (snapshot_is_being_created(s))
429 continue;
430 /*
431 * We know that no rm is currently running, so if s is marked
432 * as being deleted, a previously started rm must have failed.
433 */
434 if (s->flags & SS_BEING_DELETED)
435 return s;
436
437 if (s->flags & SS_COMPLETE) /* good snapshot */
438 continue;
439 /*
440 * This snapshot is incomplete and it is not the snapshot
441 * currently being created. However, we must not remove it if
442 * rsync is about to be restarted. As only the newest snapshot
443 * can be restarted, this snapshot is orphaned if it is not the
444 * newest snapshot or if we are not about to restart rsync.
445 */
446 if (get_newest_snapshot(sl) != s)
447 return s;
448 if (snapshot_creation_status != HS_NEEDS_RESTART)
449 return s;
450 }
451 /* no orphaned snapshots */
452 return NULL;
453 }
454
455 static int is_reference_snapshot(struct snapshot *s)
456 {
457 if (!name_of_reference_snapshot)
458 return 0;
459 return strcmp(s->name, name_of_reference_snapshot)? 0 : 1;
460 }
461
462 /*
463 * return: 0: no redundant snapshots, 1: rm process started, negative: error
464 */
465 static struct snapshot *find_redundant_snapshot(struct snapshot_list *sl)
466 {
467 int i, interval;
468 struct snapshot *s;
469 unsigned missing = 0;
470
471 DSS_DEBUG_LOG(("looking for intervals containing too many snapshots\n"));
472 for (interval = conf.num_intervals_arg - 1; interval >= 0; interval--) {
473 unsigned keep = desired_number_of_snapshots(interval, conf.num_intervals_arg);
474 unsigned num = sl->interval_count[interval];
475 struct snapshot *victim = NULL, *prev = NULL;
476 int64_t score = LONG_MAX;
477
478 if (keep >= num)
479 missing += keep - num;
480 if (keep + missing >= num)
481 continue;
482 /* redundant snapshot in this interval, pick snapshot with lowest score */
483 FOR_EACH_SNAPSHOT(s, i, sl) {
484 int64_t this_score;
485
486 if (snapshot_is_being_created(s))
487 continue;
488 if (is_reference_snapshot(s))
489 continue;
490 if (s->interval > interval) {
491 prev = s;
492 continue;
493 }
494 if (s->interval < interval)
495 break;
496 if (!victim) {
497 victim = s;
498 prev = s;
499 continue;
500 }
501 assert(prev);
502 /* check if s is a better victim */
503 this_score = s->creation_time - prev->creation_time;
504 assert(this_score >= 0);
505 if (this_score < score) {
506 score = this_score;
507 victim = s;
508 }
509 prev = s;
510 }
511 assert(victim);
512 return victim;
513 }
514 return NULL;
515 }
516
517 static struct snapshot *find_outdated_snapshot(struct snapshot_list *sl)
518 {
519 int i;
520 struct snapshot *s;
521
522 DSS_DEBUG_LOG(("looking for snapshots belonging to intervals >= %d\n",
523 conf.num_intervals_arg));
524 FOR_EACH_SNAPSHOT(s, i, sl) {
525 if (snapshot_is_being_created(s))
526 continue;
527 if (is_reference_snapshot(s))
528 continue;
529 if (s->interval < conf.num_intervals_arg)
530 continue;
531 return s;
532 }
533 return NULL;
534 }
535
536 static struct snapshot *find_oldest_removable_snapshot(struct snapshot_list *sl)
537 {
538 int i, num_complete;
539 struct snapshot *s, *ref = NULL;
540
541 num_complete = num_complete_snapshots(sl);
542 if (num_complete <= conf.min_complete_arg)
543 return NULL;
544 FOR_EACH_SNAPSHOT(s, i, sl) {
545 if (snapshot_is_being_created(s))
546 continue;
547 if (is_reference_snapshot(s)) { /* avoid this one */
548 ref = s;
549 continue;
550 }
551 DSS_INFO_LOG(("oldest removable snapshot: %s\n", s->name));
552 return s;
553 }
554 assert(ref);
555 DSS_WARNING_LOG(("removing reference snapshot %s\n", ref->name));
556 return ref;
557 }
558
559 static int rename_incomplete_snapshot(int64_t start)
560 {
561 char *old_name;
562 int ret;
563 int64_t now;
564
565 /*
566 * We don't want the dss_rename() below to fail with EEXIST because the
567 * last complete snapshot was created (and completed) in the same
568 * second as this one.
569 */
570 while ((now = get_current_time()) == start)
571 sleep(1);
572 free(path_to_last_complete_snapshot);
573 ret = complete_name(start, now, &path_to_last_complete_snapshot);
574 if (ret < 0)
575 return ret;
576 old_name = incomplete_name(start);
577 ret = dss_rename(old_name, path_to_last_complete_snapshot);
578 if (ret >= 0)
579 DSS_NOTICE_LOG(("%s -> %s\n", old_name,
580 path_to_last_complete_snapshot));
581 free(old_name);
582 return ret;
583 }
584
585 static int try_to_free_disk_space(void)
586 {
587 int ret;
588 struct snapshot_list sl;
589 struct snapshot *victim;
590 struct timeval now;
591 const char *why;
592 int low_disk_space;
593
594 ret = disk_space_low(NULL);
595 if (ret < 0)
596 return ret;
597 low_disk_space = ret;
598 gettimeofday(&now, NULL);
599 if (tv_diff(&next_removal_check, &now, NULL) > 0)
600 return 0;
601 if (!low_disk_space) {
602 if (conf.keep_redundant_given)
603 return 0;
604 if (snapshot_creation_status != HS_READY)
605 return 0;
606 if (next_snapshot_is_due())
607 return 0;
608 }
609 /*
610 * Idle and --keep_redundant not given, or low disk space. Look at
611 * existing snapshots.
612 */
613 dss_get_snapshot_list(&sl);
614 ret = 0;
615 /*
616 * Don't remove anything if there is free space and we have fewer
617 * snapshots than configured, plus one. This way there is always one
618 * snapshot that can be recycled.
619 */
620 if (!low_disk_space && sl.num_snapshots <= 1 << conf.num_intervals_arg)
621 goto out;
622 why = "outdated";
623 victim = find_outdated_snapshot(&sl);
624 if (victim)
625 goto remove;
626 why = "redundant";
627 victim = find_redundant_snapshot(&sl);
628 if (victim)
629 goto remove;
630 /* try harder only if disk space is low */
631 if (!low_disk_space)
632 goto out;
633 why = "orphaned";
634 victim = find_orphaned_snapshot(&sl);
635 if (victim)
636 goto remove;
637 DSS_WARNING_LOG(("disk space low and nothing obvious to remove\n"));
638 victim = find_oldest_removable_snapshot(&sl);
639 if (victim)
640 goto remove;
641 DSS_CRIT_LOG(("uhuhu: disk space low and nothing to remove\n"));
642 ret = -ERRNO_TO_DSS_ERROR(ENOSPC);
643 goto out;
644 remove:
645 pre_remove_hook(victim, why);
646 out:
647 free_snapshot_list(&sl);
648 return ret;
649 }
650
651 static void post_create_hook(void)
652 {
653 char *cmd = make_message("%s %s/%s", conf.post_create_hook_arg,
654 conf.dest_dir_arg, path_to_last_complete_snapshot);
655 DSS_NOTICE_LOG(("executing %s\n", cmd));
656 dss_exec_cmdline_pid(&create_pid, cmd);
657 free(cmd);
658 snapshot_creation_status = HS_POST_RUNNING;
659 }
660
661 static void post_remove_hook(void)
662 {
663 char *cmd;
664 struct snapshot *s = snapshot_currently_being_removed;
665
666 assert(s);
667
668 cmd = make_message("%s %s/%s", conf.post_remove_hook_arg,
669 conf.dest_dir_arg, s->name);
670 DSS_NOTICE_LOG(("executing %s\n", cmd));
671 dss_exec_cmdline_pid(&remove_pid, cmd);
672 free(cmd);
673 snapshot_removal_status = HS_POST_RUNNING;
674 }
675
676 static void dss_kill(pid_t pid, int sig, const char *msg)
677 {
678 const char *signame, *process_name;
679
680 if (pid == 0)
681 return;
682 switch (sig) {
683 case SIGTERM: signame = "TERM"; break;
684 case SIGSTOP: signame = "STOP"; break;
685 case SIGCONT: signame = "CONT"; break;
686 default: signame = "????";
687 }
688
689 if (pid == create_pid)
690 process_name = "create";
691 else if (pid == remove_pid)
692 process_name = "remove";
693 else process_name = "??????";
694
695 if (msg)
696 DSS_INFO_LOG(("%s\n", msg));
697 DSS_DEBUG_LOG(("sending signal %d (%s) to pid %d (%s process)\n",
698 sig, signame, (int)pid, process_name));
699 if (kill(pid, sig) >= 0)
700 return;
701 DSS_INFO_LOG(("failed to send signal %d (%s) to pid %d (%s process)\n",
702 sig, signame, (int)pid, process_name));
703 }
704
705 static void stop_create_process(void)
706 {
707 if (create_process_stopped)
708 return;
709 dss_kill(create_pid, SIGSTOP, "suspending create process");
710 create_process_stopped = 1;
711 }
712
713 static void restart_create_process(void)
714 {
715 if (!create_process_stopped)
716 return;
717 dss_kill(create_pid, SIGCONT, "resuming create process");
718 create_process_stopped = 0;
719 }
720
721 /**
722 * Print a log message about the exit status of a child.
723 */
724 static void log_termination_msg(pid_t pid, int status)
725 {
726 if (WIFEXITED(status))
727 DSS_INFO_LOG(("child %i exited. Exit status: %i\n", (int)pid,
728 WEXITSTATUS(status)));
729 else if (WIFSIGNALED(status))
730 DSS_NOTICE_LOG(("child %i was killed by signal %i\n", (int)pid,
731 WTERMSIG(status)));
732 else
733 DSS_WARNING_LOG(("child %i terminated abormally\n", (int)pid));
734 }
735
736 static int wait_for_process(pid_t pid, int *status)
737 {
738 int ret;
739
740 DSS_DEBUG_LOG(("Waiting for process %d to terminate\n", (int)pid));
741 for (;;) {
742 fd_set rfds;
743
744 FD_ZERO(&rfds);
745 FD_SET(signal_pipe, &rfds);
746 ret = dss_select(signal_pipe + 1, &rfds, NULL, NULL);
747 if (ret < 0)
748 break;
749 ret = next_signal();
750 if (!ret)
751 continue;
752 if (ret == SIGCHLD) {
753 ret = waitpid(pid, status, 0);
754 if (ret >= 0)
755 break;
756 if (errno != EINTR) { /* error */
757 ret = -ERRNO_TO_DSS_ERROR(errno);
758 break;
759 }
760 }
761 /* SIGINT or SIGTERM */
762 dss_kill(pid, SIGTERM, "killing child process");
763 }
764 if (ret < 0)
765 DSS_ERROR_LOG(("failed to wait for process %d\n", (int)pid));
766 else
767 log_termination_msg(pid, *status);
768 return ret;
769 }
770
771 static void handle_pre_remove_exit(int status)
772 {
773 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
774 snapshot_removal_status = HS_READY;
775 gettimeofday(&next_removal_check, NULL);
776 next_removal_check.tv_sec += 60;
777 return;
778 }
779 snapshot_removal_status = HS_PRE_SUCCESS;
780 }
781
782 static int handle_rm_exit(int status)
783 {
784 if (!WIFEXITED(status)) {
785 snapshot_removal_status = HS_READY;
786 return -E_INVOLUNTARY_EXIT;
787 }
788 if (WEXITSTATUS(status)) {
789 snapshot_removal_status = HS_READY;
790 return -E_BAD_EXIT_CODE;
791 }
792 snapshot_removal_status = HS_SUCCESS;
793 return 1;
794 }
795
796 static void handle_post_remove_exit(void)
797 {
798 snapshot_removal_status = HS_READY;
799 }
800
801 static int handle_remove_exit(int status)
802 {
803 int ret;
804 struct snapshot *s = snapshot_currently_being_removed;
805
806 assert(s);
807 switch (snapshot_removal_status) {
808 case HS_PRE_RUNNING:
809 handle_pre_remove_exit(status);
810 ret = 1;
811 break;
812 case HS_RUNNING:
813 ret = handle_rm_exit(status);
814 break;
815 case HS_POST_RUNNING:
816 handle_post_remove_exit();
817 ret = 1;
818 break;
819 default:
820 ret = -E_BUG;
821 }
822 if (snapshot_removal_status == HS_READY) {
823 free(s->name);
824 free(s);
825 snapshot_currently_being_removed = NULL;
826 }
827 remove_pid = 0;
828 return ret;
829 }
830
831 static int wait_for_remove_process(void)
832 {
833 int status, ret;
834
835 assert(remove_pid);
836 assert(
837 snapshot_removal_status == HS_PRE_RUNNING ||
838 snapshot_removal_status == HS_RUNNING ||
839 snapshot_removal_status == HS_POST_RUNNING
840 );
841 ret = wait_for_process(remove_pid, &status);
842 if (ret < 0)
843 return ret;
844 return handle_remove_exit(status);
845 }
846
847 static int handle_rsync_exit(int status)
848 {
849 int es, ret;
850
851 if (!WIFEXITED(status)) {
852 DSS_ERROR_LOG(("rsync process %d died involuntary\n", (int)create_pid));
853 ret = -E_INVOLUNTARY_EXIT;
854 snapshot_creation_status = HS_READY;
855 goto out;
856 }
857 es = WEXITSTATUS(status);
858 /*
859 * Restart rsync on non-fatal errors:
860 * 24: Partial transfer due to vanished source files
861 */
862 if (es != 0 && es != 24) {
863 DSS_WARNING_LOG(("rsync exit code %d, error count %d\n",
864 es, ++num_consecutive_rsync_errors));
865 if (num_consecutive_rsync_errors > conf.max_rsync_errors_arg) {
866 ret = -E_TOO_MANY_RSYNC_ERRORS;
867 snapshot_creation_status = HS_READY;
868 goto out;
869 }
870 DSS_WARNING_LOG(("restarting rsync process\n"));
871 snapshot_creation_status = HS_NEEDS_RESTART;
872 next_snapshot_time = get_current_time() + 60;
873 ret = 1;
874 goto out;
875 }
876 num_consecutive_rsync_errors = 0;
877 ret = rename_incomplete_snapshot(current_snapshot_creation_time);
878 if (ret < 0)
879 goto out;
880 snapshot_creation_status = HS_SUCCESS;
881 free(name_of_reference_snapshot);
882 name_of_reference_snapshot = NULL;
883 out:
884 create_process_stopped = 0;
885 return ret;
886 }
887
888 static int handle_pre_create_hook_exit(int status)
889 {
890 int es, ret;
891 static int warn_count;
892
893 if (!WIFEXITED(status)) {
894 snapshot_creation_status = HS_READY;
895 ret = -E_INVOLUNTARY_EXIT;
896 goto out;
897 }
898 es = WEXITSTATUS(status);
899 if (es) {
900 if (!warn_count--) {
901 DSS_NOTICE_LOG(("pre_create_hook %s returned %d\n",
902 conf.pre_create_hook_arg, es));
903 DSS_NOTICE_LOG(("deferring snapshot creation...\n"));
904 warn_count = 60; /* warn only once per hour */
905 }
906 next_snapshot_time = get_current_time() + 60;
907 snapshot_creation_status = HS_READY;
908 ret = 0;
909 goto out;
910 }
911 warn_count = 0;
912 snapshot_creation_status = HS_PRE_SUCCESS;
913 ret = 1;
914 out:
915 return ret;
916 }
917
918 static int handle_sigchld(void)
919 {
920 pid_t pid;
921 int status, ret = reap_child(&pid, &status);
922
923 if (ret <= 0)
924 return ret;
925
926 if (pid == create_pid) {
927 switch (snapshot_creation_status) {
928 case HS_PRE_RUNNING:
929 ret = handle_pre_create_hook_exit(status);
930 break;
931 case HS_RUNNING:
932 ret = handle_rsync_exit(status);
933 break;
934 case HS_POST_RUNNING:
935 snapshot_creation_status = HS_READY;
936 ret = 1;
937 break;
938 default:
939 DSS_EMERG_LOG(("BUG: create can't die in status %d\n",
940 snapshot_creation_status));
941 return -E_BUG;
942 }
943 create_pid = 0;
944 return ret;
945 }
946 if (pid == remove_pid) {
947 ret = handle_remove_exit(status);
948 if (ret < 0)
949 return ret;
950 return ret;
951 }
952 DSS_EMERG_LOG(("BUG: unknown process %d died\n", (int)pid));
953 return -E_BUG;
954 }
955
956 static int check_config(void)
957 {
958 if (conf.unit_interval_arg <= 0) {
959 DSS_ERROR_LOG(("bad unit interval: %i\n", conf.unit_interval_arg));
960 return -E_INVALID_NUMBER;
961 }
962 DSS_DEBUG_LOG(("unit interval: %i day(s)\n", conf.unit_interval_arg));
963 if (conf.num_intervals_arg <= 0 || conf.num_intervals_arg > 30) {
964 DSS_ERROR_LOG(("bad number of intervals: %i\n",
965 conf.num_intervals_arg));
966 return -E_INVALID_NUMBER;
967 }
968 DSS_DEBUG_LOG(("number of intervals: %i\n", conf.num_intervals_arg));
969 return 1;
970 }
971
972 /*
973 * Returns < 0 on errors, 0 if no config file is given and > 0 if the config
974 * file was read successfully.
975 */
976 static int parse_config_file(int override)
977 {
978 int ret, config_file_exists;
979 char *config_file = get_config_file_name();
980 struct stat statbuf;
981 char *old_logfile_arg = NULL;
982 int old_daemon_given = 0;
983
984 if (override) { /* SIGHUP */
985 if (conf.logfile_given)
986 old_logfile_arg = dss_strdup(conf.logfile_arg);
987 old_daemon_given = conf.daemon_given;
988 }
989
990 config_file_exists = !stat(config_file, &statbuf);
991 if (!config_file_exists && conf.config_file_given) {
992 ret = -ERRNO_TO_DSS_ERROR(errno);
993 DSS_ERROR_LOG(("failed to stat config file %s\n", config_file));
994 goto out;
995 }
996 if (config_file_exists) {
997 struct cmdline_parser_params params;
998 params.override = override;
999 params.initialize = 0;
1000 params.check_required = 1;
1001 params.check_ambiguity = 0;
1002 params.print_errors = 1;
1003 if (override) { /* invalidate all rsync options */
1004 int i;
1005
1006 for (i = 0; i < conf.rsync_option_given; i++) {
1007 free(conf.rsync_option_arg[i]);
1008 conf.rsync_option_arg[i] = NULL;
1009 }
1010 conf.rsync_option_given = 0;
1011 }
1012 cmdline_parser_config_file(config_file, &conf, &params);
1013 }
1014 ret = check_config();
1015 if (ret < 0)
1016 goto out;
1017 if (override) {
1018 /* don't change daemon mode on SIGHUP */
1019 conf.daemon_given = old_daemon_given;
1020 close_log(logfile);
1021 logfile = NULL;
1022 if (conf.logfile_given)
1023 free(old_logfile_arg);
1024 else if (conf.daemon_given) { /* re-use old logfile */
1025 conf.logfile_arg = old_logfile_arg;
1026 conf.logfile_given = 1;
1027 }
1028 }
1029 if (conf.logfile_given && conf.run_given && conf.daemon_given) {
1030 logfile = open_log(conf.logfile_arg);
1031 log_welcome(conf.loglevel_arg);
1032 }
1033 DSS_DEBUG_LOG(("loglevel: %d\n", conf.loglevel_arg));
1034 ret = config_file_exists;
1035 out:
1036 free(config_file);
1037 if (ret < 0)
1038 DSS_EMERG_LOG(("%s\n", dss_strerror(-ret)));
1039 return ret;
1040 }
1041
1042 static int change_to_dest_dir(void)
1043 {
1044 DSS_INFO_LOG(("changing cwd to %s\n", conf.dest_dir_arg));
1045 return dss_chdir(conf.dest_dir_arg);
1046 }
1047
1048 static int handle_sighup(void)
1049 {
1050 int ret;
1051
1052 DSS_NOTICE_LOG(("SIGHUP, re-reading config\n"));
1053 dump_dss_config("old");
1054 ret = parse_config_file(1);
1055 if (ret < 0)
1056 return ret;
1057 dump_dss_config("reloaded");
1058 invalidate_next_snapshot_time();
1059 return change_to_dest_dir();
1060 }
1061
1062 static void kill_children(void)
1063 {
1064 restart_create_process();
1065 dss_kill(create_pid, SIGTERM, NULL);
1066 dss_kill(remove_pid, SIGTERM, NULL);
1067 }
1068
1069 static int handle_signal(void)
1070 {
1071 int sig, ret = next_signal();
1072
1073 if (ret <= 0)
1074 goto out;
1075 sig = ret;
1076 switch (sig) {
1077 case SIGINT:
1078 case SIGTERM:
1079 kill_children();
1080 ret = -E_SIGNAL;
1081 break;
1082 case SIGHUP:
1083 ret = handle_sighup();
1084 break;
1085 case SIGCHLD:
1086 ret = handle_sigchld();
1087 break;
1088 }
1089 out:
1090 if (ret < 0)
1091 DSS_ERROR_LOG(("%s\n", dss_strerror(-ret)));
1092 return ret;
1093 }
1094
1095 /*
1096 * We can not use rsync locally if the local user is different from the remote
1097 * user or if the src dir is not on the local host (or both).
1098 */
1099 static int use_rsync_locally(char *logname)
1100 {
1101 char *h = conf.remote_host_arg;
1102
1103 if (strcmp(h, "localhost") && strcmp(h, "127.0.0.1"))
1104 return 0;
1105 if (conf.remote_user_given && strcmp(conf.remote_user_arg, logname))
1106 return 0;
1107 return 1;
1108 }
1109
1110 static int rename_resume_snap(int64_t creation_time)
1111 {
1112 struct snapshot_list sl;
1113 struct snapshot *s = NULL;
1114 char *new_name = incomplete_name(creation_time);
1115 int ret;
1116 const char *why;
1117
1118 sl.num_snapshots = 0;
1119
1120 ret = 0;
1121 if (conf.no_resume_given)
1122 goto out;
1123 dss_get_snapshot_list(&sl);
1124 /*
1125 * Snapshot recycling: We first look at the newest snapshot. If this
1126 * snapshot happens to be incomplete, the last rsync process was
1127 * aborted and we reuse this one. Otherwise we look at snapshots which
1128 * could be removed (outdated and redundant snapshots) as candidates
1129 * for recycling. If no outdated/redundant snapshot exists, we check if
1130 * there is an orphaned snapshot, which likely is useless anyway.
1131 *
1132 * Only if no existing snapshot is suitable for recycling, we bite the
1133 * bullet and create a new one.
1134 */
1135 s = get_newest_snapshot(&sl);
1136 if (!s) /* no snapshots at all */
1137 goto out;
1138 /* re-use last snapshot if it is incomplete */
1139 why = "aborted";
1140 if ((s->flags & SS_COMPLETE) == 0)
1141 goto out;
1142 why = "outdated";
1143 s = find_outdated_snapshot(&sl);
1144 if (s)
1145 goto out;
1146 why = "redundant";
1147 s = find_redundant_snapshot(&sl);
1148 if (s)
1149 goto out;
1150 why = "orphaned";
1151 s = find_orphaned_snapshot(&sl);
1152 out:
1153 if (s) {
1154 DSS_INFO_LOG(("reusing %s snapshot %s\n", why, s->name));
1155 ret = dss_rename(s->name, new_name);
1156 }
1157 if (ret >= 0)
1158 DSS_NOTICE_LOG(("creating new snapshot %s\n", new_name));
1159 free(new_name);
1160 free_snapshot_list(&sl);
1161 return ret;
1162 }
1163
1164 static void create_rsync_argv(char ***argv, int64_t *num)
1165 {
1166 char *logname;
1167 int i = 0, j;
1168 struct snapshot_list sl;
1169
1170 dss_get_snapshot_list(&sl);
1171 assert(!name_of_reference_snapshot);
1172 name_of_reference_snapshot = name_of_newest_complete_snapshot(&sl);
1173 free_snapshot_list(&sl);
1174
1175 *argv = dss_malloc((15 + conf.rsync_option_given) * sizeof(char *));
1176 (*argv)[i++] = dss_strdup("rsync");
1177 (*argv)[i++] = dss_strdup("-a");
1178 (*argv)[i++] = dss_strdup("--delete");
1179 for (j = 0; j < conf.rsync_option_given; j++)
1180 (*argv)[i++] = dss_strdup(conf.rsync_option_arg[j]);
1181 if (name_of_reference_snapshot) {
1182 DSS_INFO_LOG(("using %s as reference\n", name_of_reference_snapshot));
1183 (*argv)[i++] = make_message("--link-dest=../%s",
1184 name_of_reference_snapshot);
1185 } else
1186 DSS_INFO_LOG(("no suitable reference snapshot found\n"));
1187 logname = dss_logname();
1188 if (use_rsync_locally(logname))
1189 (*argv)[i++] = dss_strdup(conf.source_dir_arg);
1190 else
1191 (*argv)[i++] = make_message("%s@%s:%s/", conf.remote_user_given?
1192 conf.remote_user_arg : logname,
1193 conf.remote_host_arg, conf.source_dir_arg);
1194 free(logname);
1195 *num = get_current_time();
1196 (*argv)[i++] = incomplete_name(*num);
1197 (*argv)[i++] = NULL;
1198 for (j = 0; j < i; j++)
1199 DSS_DEBUG_LOG(("argv[%d] = %s\n", j, (*argv)[j]));
1200 }
1201
1202 static void free_rsync_argv(char **argv)
1203 {
1204 int i;
1205
1206 if (!argv)
1207 return;
1208 for (i = 0; argv[i]; i++)
1209 free(argv[i]);
1210 free(argv);
1211 }
1212
1213 static int create_snapshot(char **argv)
1214 {
1215 int ret;
1216
1217 ret = rename_resume_snap(current_snapshot_creation_time);
1218 if (ret < 0)
1219 return ret;
1220 dss_exec(&create_pid, argv[0], argv);
1221 snapshot_creation_status = HS_RUNNING;
1222 return ret;
1223 }
1224
1225 static int select_loop(void)
1226 {
1227 int ret;
1228 /* check every 60 seconds for free disk space */
1229 struct timeval tv;
1230 char **rsync_argv = NULL;
1231
1232 for (;;) {
1233 fd_set rfds;
1234 struct timeval *tvp;
1235
1236 if (remove_pid)
1237 tvp = NULL; /* sleep until rm hook/process dies */
1238 else { /* sleep one minute */
1239 tv.tv_sec = 60;
1240 tv.tv_usec = 0;
1241 tvp = &tv;
1242 }
1243 FD_ZERO(&rfds);
1244 FD_SET(signal_pipe, &rfds);
1245 ret = dss_select(signal_pipe + 1, &rfds, NULL, tvp);
1246 if (ret < 0)
1247 goto out;
1248 if (FD_ISSET(signal_pipe, &rfds)) {
1249 ret = handle_signal();
1250 if (ret < 0)
1251 goto out;
1252 }
1253 if (remove_pid)
1254 continue;
1255 if (snapshot_removal_status == HS_PRE_SUCCESS) {
1256 ret = exec_rm();
1257 if (ret < 0)
1258 goto out;
1259 continue;
1260 }
1261 if (snapshot_removal_status == HS_SUCCESS) {
1262 post_remove_hook();
1263 continue;
1264 }
1265 ret = try_to_free_disk_space();
1266 if (ret < 0)
1267 goto out;
1268 if (snapshot_removal_status != HS_READY) {
1269 stop_create_process();
1270 continue;
1271 }
1272 restart_create_process();
1273 switch (snapshot_creation_status) {
1274 case HS_READY:
1275 if (!next_snapshot_is_due())
1276 continue;
1277 pre_create_hook();
1278 continue;
1279 case HS_PRE_RUNNING:
1280 case HS_RUNNING:
1281 case HS_POST_RUNNING:
1282 continue;
1283 case HS_PRE_SUCCESS:
1284 if (!name_of_reference_snapshot) {
1285 free_rsync_argv(rsync_argv);
1286 create_rsync_argv(&rsync_argv, &current_snapshot_creation_time);
1287 }
1288 ret = create_snapshot(rsync_argv);
1289 if (ret < 0)
1290 goto out;
1291 continue;
1292 case HS_NEEDS_RESTART:
1293 if (!next_snapshot_is_due())
1294 continue;
1295 ret = create_snapshot(rsync_argv);
1296 if (ret < 0)
1297 goto out;
1298 continue;
1299 case HS_SUCCESS:
1300 post_create_hook();
1301 continue;
1302 }
1303 }
1304 out:
1305 return ret;
1306 }
1307
1308 static void exit_hook(int exit_code)
1309 {
1310 char *argv[3];
1311 pid_t pid;
1312
1313 argv[0] = conf.exit_hook_arg;
1314 argv[1] = dss_strerror(-exit_code);
1315 argv[2] = NULL;
1316
1317 DSS_NOTICE_LOG(("executing %s %s\n", argv[0], argv[1]));
1318 dss_exec(&pid, conf.exit_hook_arg, argv);
1319 }
1320
1321 static void lock_dss_or_die(void)
1322 {
1323 char *config_file = get_config_file_name();
1324 int ret = lock_dss(config_file);
1325
1326 free(config_file);
1327 if (ret < 0) {
1328 DSS_EMERG_LOG(("failed to lock: %s\n", dss_strerror(-ret)));
1329 exit(EXIT_FAILURE);
1330 }
1331 }
1332
1333 static int com_run(void)
1334 {
1335 int ret;
1336
1337 lock_dss_or_die();
1338 if (conf.dry_run_given) {
1339 DSS_ERROR_LOG(("dry_run not supported by this command\n"));
1340 return -E_SYNTAX;
1341 }
1342 ret = install_sighandler(SIGHUP);
1343 if (ret < 0)
1344 return ret;
1345 ret = select_loop();
1346 if (ret >= 0) /* impossible */
1347 ret = -E_BUG;
1348 kill_children();
1349 exit_hook(ret);
1350 return ret;
1351 }
1352
1353 static int com_prune(void)
1354 {
1355 int ret;
1356 struct snapshot_list sl;
1357 struct snapshot *victim;
1358 struct disk_space ds;
1359 const char *why;
1360
1361 lock_dss_or_die();
1362 ret = get_disk_space(".", &ds);
1363 if (ret < 0)
1364 return ret;
1365 log_disk_space(&ds);
1366 dss_get_snapshot_list(&sl);
1367 why = "outdated";
1368 victim = find_outdated_snapshot(&sl);
1369 if (victim)
1370 goto rm;
1371 why = "redundant";
1372 victim = find_redundant_snapshot(&sl);
1373 if (victim)
1374 goto rm;
1375 ret = 0;
1376 goto out;
1377 rm:
1378 if (conf.dry_run_given) {
1379 dss_msg("%s snapshot %s (interval = %i)\n",
1380 why, victim->name, victim->interval);
1381 ret = 0;
1382 goto out;
1383 }
1384 pre_remove_hook(victim, why);
1385 if (snapshot_removal_status == HS_PRE_RUNNING) {
1386 ret = wait_for_remove_process();
1387 if (ret < 0)
1388 goto out;
1389 if (snapshot_removal_status != HS_PRE_SUCCESS)
1390 goto out;
1391 }
1392 ret = exec_rm();
1393 if (ret < 0)
1394 goto out;
1395 ret = wait_for_remove_process();
1396 if (ret < 0)
1397 goto out;
1398 if (snapshot_removal_status != HS_SUCCESS)
1399 goto out;
1400 post_remove_hook();
1401 if (snapshot_removal_status != HS_POST_RUNNING)
1402 goto out;
1403 ret = wait_for_remove_process();
1404 if (ret < 0)
1405 goto out;
1406 ret = 1;
1407 out:
1408 free_snapshot_list(&sl);
1409 return ret;
1410 }
1411
1412 static int com_create(void)
1413 {
1414 int ret, status;
1415 char **rsync_argv;
1416
1417 lock_dss_or_die();
1418 if (conf.dry_run_given) {
1419 int i;
1420 char *msg = NULL;
1421 create_rsync_argv(&rsync_argv, &current_snapshot_creation_time);
1422 for (i = 0; rsync_argv[i]; i++) {
1423 char *tmp = msg;
1424 msg = make_message("%s%s%s", tmp? tmp : "",
1425 tmp? " " : "", rsync_argv[i]);
1426 free(tmp);
1427 }
1428 free_rsync_argv(rsync_argv);
1429 dss_msg("%s\n", msg);
1430 free(msg);
1431 return 1;
1432 }
1433 pre_create_hook();
1434 if (create_pid) {
1435 ret = wait_for_process(create_pid, &status);
1436 if (ret < 0)
1437 return ret;
1438 ret = handle_pre_create_hook_exit(status);
1439 if (ret <= 0) /* error, or pre-create failed */
1440 return ret;
1441 }
1442 create_rsync_argv(&rsync_argv, &current_snapshot_creation_time);
1443 ret = create_snapshot(rsync_argv);
1444 if (ret < 0)
1445 goto out;
1446 ret = wait_for_process(create_pid, &status);
1447 if (ret < 0)
1448 goto out;
1449 ret = handle_rsync_exit(status);
1450 if (ret < 0)
1451 goto out;
1452 post_create_hook();
1453 if (create_pid)
1454 ret = wait_for_process(create_pid, &status);
1455 out:
1456 free_rsync_argv(rsync_argv);
1457 return ret;
1458 }
1459
1460 static int com_ls(void)
1461 {
1462 int i;
1463 struct snapshot_list sl;
1464 struct snapshot *s;
1465
1466 dss_get_snapshot_list(&sl);
1467 FOR_EACH_SNAPSHOT(s, i, &sl) {
1468 int64_t d = 0;
1469 if (s->flags & SS_COMPLETE)
1470 d = (s->completion_time - s->creation_time) / 60;
1471 dss_msg("%u\t%s\t%3" PRId64 ":%02" PRId64 "\n", s->interval, s->name, d/60, d%60);
1472 }
1473 free_snapshot_list(&sl);
1474 return 1;
1475 }
1476
1477 static int setup_signal_handling(void)
1478 {
1479 int ret;
1480
1481 DSS_INFO_LOG(("setting up signal handlers\n"));
1482 signal_pipe = signal_init(); /* always successful */
1483 ret = install_sighandler(SIGINT);
1484 if (ret < 0)
1485 return ret;
1486 ret = install_sighandler(SIGTERM);
1487 if (ret < 0)
1488 return ret;
1489 return install_sighandler(SIGCHLD);
1490 }
1491
1492 /**
1493 * The main function of dss.
1494 *
1495 * \param argc Usual argument count.
1496 * \param argv Usual argument vector.
1497 */
1498 int main(int argc, char **argv)
1499 {
1500 int ret;
1501 struct cmdline_parser_params params;
1502
1503 params.override = 0;
1504 params.initialize = 1;
1505 params.check_required = 0;
1506 params.check_ambiguity = 0;
1507 params.print_errors = 1;
1508
1509 cmdline_parser_ext(argc, argv, &conf, &params); /* aborts on errors */
1510 ret = parse_config_file(0);
1511 if (ret < 0)
1512 goto out;
1513 if (ret == 0) { /* no config file given */
1514 /*
1515 * Parse the command line options again, but this time check
1516 * that all required options are given.
1517 */
1518 struct cmdline_parser_params params;
1519 params.override = 1;
1520 params.initialize = 1;
1521 params.check_required = 1;
1522 params.check_ambiguity = 1;
1523 params.print_errors = 1;
1524 cmdline_parser_ext(argc, argv, &conf, &params); /* aborts on errors */
1525 }
1526 if (conf.daemon_given)
1527 daemon_init();
1528 ret = change_to_dest_dir();
1529 if (ret < 0)
1530 goto out;
1531 dump_dss_config("startup");
1532 ret = setup_signal_handling();
1533 if (ret < 0)
1534 goto out;
1535 ret = call_command_handler();
1536 signal_shutdown();
1537 out:
1538 if (ret < 0)
1539 DSS_EMERG_LOG(("%s\n", dss_strerror(-ret)));
1540 exit(ret >= 0? EXIT_SUCCESS : EXIT_FAILURE);
1541 }