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