2 * Copyright (C) 2008-2009 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
11 #include <sys/types.h>
24 #include "gcc-compat.h"
37 /** Command line and config file options. */
38 static struct gengetopt_args_info conf;
39 /** Non-NULL if we log to a file. */
41 /** The read end of the signal pipe */
42 static int signal_pipe;
43 /** Process id of current pre-create-hook/rsync/post-create-hook process. */
44 static pid_t create_pid;
45 /** Whether the pre-create-hook/rsync/post-create-hook is currently stopped. */
46 static int create_process_stopped;
47 /** Process id of current pre-remove/rm/post-remove process. */
48 static pid_t remove_pid;
49 /** When the next snapshot is due. */
50 static int64_t next_snapshot_time;
51 /** When to try to remove something. */
52 static struct timeval next_removal_check;
53 /** Creation time of the snapshot currently being created. */
54 static int64_t current_snapshot_creation_time;
55 /** The snapshot currently being removed. */
56 struct snapshot *snapshot_currently_being_removed;
57 /** Needed by the post-create hook. */
58 static char *path_to_last_complete_snapshot;
59 static char *name_of_reference_snapshot;
60 /** \sa \ref snap.h for details. */
61 enum hook_status snapshot_creation_status;
62 /** \sa \ref snap.h for details. */
63 enum hook_status snapshot_removal_status;
69 /* a litte cpp magic helps to DRY */
75 #define COMMAND(x) static int com_ ##x(void);
78 #define COMMAND(x) if (conf.x ##_given) return com_ ##x();
79 static int call_command_handler(void)
82 DSS_EMERG_LOG("BUG: did not find command handler\n");
89 * The log function of dss.
92 * \param fml Usual format string.
94 * All DSS_XXX_LOG() macros use this function.
96 __printf_2_3 void dss_log(int ll, const char* fmt,...)
104 if (ll < conf.loglevel_arg)
106 outfd = logfile? logfile : stderr;
109 strftime(str, sizeof(str), "%b %d %H:%M:%S", tm);
110 fprintf(outfd, "%s ", str);
111 if (conf.loglevel_arg <= INFO)
112 fprintf(outfd, "%i: ", ll);
114 vfprintf(outfd, fmt, argp);
119 * Print a message either to stdout or to the log file.
121 static __printf_1_2 void dss_msg(const char* fmt,...)
123 FILE *outfd = conf.daemon_given? logfile : stdout;
126 vfprintf(outfd, fmt, argp);
130 static int disk_space_low(void)
132 struct disk_space ds;
133 int ret = get_disk_space(".", &ds);
137 if (conf.min_free_mb_arg)
138 if (ds.free_mb < conf.min_free_mb_arg)
140 if (conf.min_free_percent_arg)
141 if (ds.percent_free < conf.min_free_percent_arg)
143 if (conf.min_free_percent_inodes_arg)
144 if (ds.percent_free_inodes < conf.min_free_percent_inodes_arg)
149 static void dss_get_snapshot_list(struct snapshot_list *sl)
151 get_snapshot_list(sl, conf.unit_interval_arg, conf.num_intervals_arg);
154 static int next_snapshot_is_due(void)
156 int64_t x = 0, now = get_current_time(), unit_interval
157 = 24 * 3600 * conf.unit_interval_arg;
158 unsigned wanted = desired_number_of_snapshots(0, conf.num_intervals_arg),
159 num_complete_snapshots = 0;
161 struct snapshot *s = NULL;
162 struct snapshot_list sl;
164 if (next_snapshot_time > now)
166 assert(snapshot_creation_status == HS_READY);
167 current_snapshot_creation_time = 0;
168 dss_get_snapshot_list(&sl);
169 FOR_EACH_SNAPSHOT(s, i, &sl) {
170 if (!(s->flags & SS_COMPLETE))
172 num_complete_snapshots++;
173 x += s->completion_time - s->creation_time;
177 next_snapshot_time = now;
178 if (num_complete_snapshots == 0)
180 x /= num_complete_snapshots; /* avg time to create one snapshot */
181 if (unit_interval < x * wanted) /* oops, no sleep at all */
183 next_snapshot_time = s->completion_time + unit_interval / wanted - x;
185 free_snapshot_list(&sl);
186 ret = next_snapshot_time <= now;
188 DSS_DEBUG_LOG("next snapshot due in %lu seconds\n",
189 next_snapshot_time - now);
191 DSS_DEBUG_LOG("next snapshot: now\n");
195 static int pre_create_hook(void)
197 int ret, fds[3] = {0, 0, 0};
199 assert(snapshot_creation_status == HS_READY);
200 if (!conf.pre_create_hook_given) {
201 snapshot_creation_status = HS_PRE_SUCCESS;
204 DSS_DEBUG_LOG("executing %s\n", conf.pre_create_hook_arg);
205 ret = dss_exec_cmdline_pid(&create_pid,
206 conf.pre_create_hook_arg, fds);
209 snapshot_creation_status = HS_PRE_RUNNING;
213 static int pre_remove_hook(struct snapshot *s, const char *why)
215 int ret, fds[3] = {0, 0, 0};
220 DSS_DEBUG_LOG("%s snapshot %s\n", why, s->name);
221 assert(snapshot_removal_status == HS_READY);
222 assert(remove_pid == 0);
223 assert(!snapshot_currently_being_removed);
225 snapshot_currently_being_removed = dss_malloc(sizeof(struct snapshot));
226 *snapshot_currently_being_removed = *s;
227 snapshot_currently_being_removed->name = dss_strdup(s->name);
229 if (!conf.pre_remove_hook_given) {
230 snapshot_removal_status = HS_PRE_SUCCESS;
233 cmd = make_message("%s %s/%s", conf.pre_remove_hook_arg,
234 conf.dest_dir_arg, s->name);
235 DSS_DEBUG_LOG("executing %s\n", cmd);
236 ret = dss_exec_cmdline_pid(&remove_pid,
237 conf.pre_remove_hook_arg, fds);
241 snapshot_removal_status = HS_PRE_RUNNING;
245 static int exec_rm(void)
247 struct snapshot *s = snapshot_currently_being_removed;
248 int fds[3] = {0, 0, 0};
249 char *new_name = being_deleted_name(s);
250 char *argv[] = {"rm", "-rf", new_name, NULL};
253 assert(snapshot_removal_status == HS_PRE_SUCCESS);
254 assert(remove_pid == 0);
256 DSS_NOTICE_LOG("removing %s (interval = %i)\n", s->name, s->interval);
257 ret = dss_rename(s->name, new_name);
260 ret = dss_exec(&remove_pid, argv[0], argv, fds);
263 snapshot_removal_status = HS_RUNNING;
269 static int snapshot_is_being_created(struct snapshot *s)
271 return s->creation_time == current_snapshot_creation_time;
274 static struct snapshot *find_orphaned_snapshot(struct snapshot_list *sl)
279 DSS_DEBUG_LOG("looking for orphaned snapshots\n");
280 FOR_EACH_SNAPSHOT(s, i, sl) {
281 if (snapshot_is_being_created(s))
284 * We know that no rm is currently running, so if s is marked
285 * as being deleted, a previously started rm must have failed.
287 if (s->flags & SS_BEING_DELETED)
290 if (s->flags & SS_COMPLETE) /* good snapshot */
293 * This snapshot is incomplete and it is not the snapshot
294 * currently being created. However, we must not remove it if
295 * rsync is about to be restarted. As only the newest snapshot
296 * can be restarted, this snapshot is orphaned if it is not the
297 * newest snapshot or if we are not about to restart rsync.
299 if (get_newest_snapshot(sl) != s)
301 if (snapshot_creation_status != HS_NEEDS_RESTART)
304 /* no orphaned snapshots */
308 static int is_reference_snapshot(struct snapshot *s)
310 if (!name_of_reference_snapshot)
312 return strcmp(s->name, name_of_reference_snapshot)? 0 : 1;
316 * return: 0: no redundant snapshots, 1: rm process started, negative: error
318 static struct snapshot *find_redundant_snapshot(struct snapshot_list *sl)
322 unsigned missing = 0;
324 DSS_DEBUG_LOG("looking for intervals containing too many snapshots\n");
325 for (interval = conf.num_intervals_arg - 1; interval >= 0; interval--) {
326 unsigned keep = desired_number_of_snapshots(interval, conf.num_intervals_arg);
327 unsigned num = sl->interval_count[interval];
328 struct snapshot *victim = NULL, *prev = NULL;
329 int64_t score = LONG_MAX;
332 missing += keep - num;
333 // DSS_DEBUG_LOG("interval %i: keep: %u, have: %u, missing: %u\n",
334 // interval, keep, num, missing);
335 if (keep + missing >= num)
337 /* redundant snapshot in this interval, pick snapshot with lowest score */
338 FOR_EACH_SNAPSHOT(s, i, sl) {
341 if (snapshot_is_being_created(s))
343 if (is_reference_snapshot(s))
345 //DSS_DEBUG_LOG("checking %s\n", s->name);
346 if (s->interval > interval) {
350 if (s->interval < interval)
358 /* check if s is a better victim */
359 this_score = s->creation_time - prev->creation_time;
360 assert(this_score >= 0);
361 //DSS_DEBUG_LOG("%s: score %lli\n", s->name, (long long)score);
362 if (this_score < score) {
374 static struct snapshot *find_outdated_snapshot(struct snapshot_list *sl)
379 DSS_DEBUG_LOG("looking for snapshots belonging to intervals >= %d\n",
380 conf.num_intervals_arg);
381 FOR_EACH_SNAPSHOT(s, i, sl) {
382 if (snapshot_is_being_created(s))
384 if (is_reference_snapshot(s))
386 if (s->interval < conf.num_intervals_arg)
393 struct snapshot *find_oldest_removable_snapshot(struct snapshot_list *sl)
397 FOR_EACH_SNAPSHOT(s, i, sl) {
398 if (snapshot_is_being_created(s))
400 if (is_reference_snapshot(s))
402 DSS_INFO_LOG("oldest removable snapshot: %s\n", s->name);
408 static int rename_incomplete_snapshot(int64_t start)
413 free(path_to_last_complete_snapshot);
414 ret = complete_name(start, get_current_time(),
415 &path_to_last_complete_snapshot);
418 old_name = incomplete_name(start);
419 ret = dss_rename(old_name, path_to_last_complete_snapshot);
421 DSS_NOTICE_LOG("%s -> %s\n", old_name,
422 path_to_last_complete_snapshot);
427 static int try_to_free_disk_space(void)
430 struct snapshot_list sl;
431 struct snapshot *victim;
436 ret = disk_space_low();
439 low_disk_space = ret;
440 gettimeofday(&now, NULL);
441 if (tv_diff(&next_removal_check, &now, NULL) > 0)
443 if (!low_disk_space) {
444 if (conf.keep_redundant_given)
446 if (snapshot_creation_status != HS_READY)
448 if (next_snapshot_is_due())
451 dss_get_snapshot_list(&sl);
453 if (!low_disk_space && sl.num_snapshots <= 1)
456 victim = find_outdated_snapshot(&sl);
460 victim = find_redundant_snapshot(&sl);
463 /* try harder only if disk space is low */
467 victim = find_orphaned_snapshot(&sl);
470 DSS_WARNING_LOG("disk space low and nothing obvious to remove\n");
471 victim = find_oldest_removable_snapshot(&sl);
474 DSS_CRIT_LOG("uhuhu: disk space low and nothing to remove\n");
475 ret = -ERRNO_TO_DSS_ERROR(ENOSPC);
478 ret = pre_remove_hook(victim, why);
480 free_snapshot_list(&sl);
484 static int post_create_hook(void)
486 int ret, fds[3] = {0, 0, 0};
489 if (!conf.post_create_hook_given) {
490 snapshot_creation_status = HS_READY;
493 cmd = make_message("%s %s/%s", conf.post_create_hook_arg,
494 conf.dest_dir_arg, path_to_last_complete_snapshot);
495 DSS_NOTICE_LOG("executing %s\n", cmd);
496 ret = dss_exec_cmdline_pid(&create_pid, cmd, fds);
500 snapshot_creation_status = HS_POST_RUNNING;
504 static int post_remove_hook(void)
506 int ret, fds[3] = {0, 0, 0};
508 struct snapshot *s = snapshot_currently_being_removed;
512 if (!conf.post_remove_hook_given) {
513 snapshot_removal_status = HS_READY;
516 cmd = make_message("%s %s/%s", conf.post_remove_hook_arg,
517 conf.dest_dir_arg, s->name);
518 DSS_NOTICE_LOG("executing %s\n", cmd);
519 ret = dss_exec_cmdline_pid(&remove_pid, cmd, fds);
523 snapshot_removal_status = HS_POST_RUNNING;
527 static void kill_process(pid_t pid)
531 DSS_WARNING_LOG("sending SIGTERM to pid %d\n", (int)pid);
535 static void stop_create_process(void)
537 if (!create_pid || create_process_stopped)
539 kill(SIGSTOP, create_pid);
540 create_process_stopped = 1;
543 static void restart_create_process(void)
545 if (!create_pid || !create_process_stopped)
547 kill (SIGCONT, create_pid);
548 create_process_stopped = 0;
552 * Print a log message about the exit status of a child.
554 static void log_termination_msg(pid_t pid, int status)
556 if (WIFEXITED(status))
557 DSS_INFO_LOG("child %i exited. Exit status: %i\n", (int)pid,
558 WEXITSTATUS(status));
559 else if (WIFSIGNALED(status))
560 DSS_NOTICE_LOG("child %i was killed by signal %i\n", (int)pid,
563 DSS_WARNING_LOG("child %i terminated abormally\n", (int)pid);
566 static int wait_for_process(pid_t pid, int *status)
570 DSS_DEBUG_LOG("Waiting for process %d to terminate\n", (int)pid);
575 FD_SET(signal_pipe, &rfds);
576 ret = dss_select(signal_pipe + 1, &rfds, NULL, NULL);
582 if (ret == SIGCHLD) {
583 ret = waitpid(pid, status, 0);
586 if (errno != EINTR) { /* error */
587 ret = -ERRNO_TO_DSS_ERROR(errno);
591 /* SIGINT or SIGTERM */
592 DSS_WARNING_LOG("sending SIGTERM to pid %d\n", (int)pid);
596 DSS_ERROR_LOG("failed to wait for process %d\n", (int)pid);
598 log_termination_msg(pid, *status);
602 static void handle_pre_remove_exit(int status)
604 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
605 snapshot_removal_status = HS_READY;
606 gettimeofday(&next_removal_check, NULL);
607 next_removal_check.tv_sec += 60;
610 snapshot_removal_status = HS_PRE_SUCCESS;
613 static int handle_rm_exit(int status)
615 if (!WIFEXITED(status)) {
616 snapshot_removal_status = HS_READY;
617 return -E_INVOLUNTARY_EXIT;
619 if (WEXITSTATUS(status)) {
620 snapshot_removal_status = HS_READY;
621 return -E_BAD_EXIT_CODE;
623 if (conf.post_remove_hook_given)
624 snapshot_removal_status = HS_SUCCESS;
626 snapshot_removal_status = HS_READY;
630 static void handle_post_remove_exit(void)
632 snapshot_removal_status = HS_READY;
635 static int handle_remove_exit(int status)
638 struct snapshot *s = snapshot_currently_being_removed;
641 switch (snapshot_removal_status) {
643 handle_pre_remove_exit(status);
647 ret = handle_rm_exit(status);
649 case HS_POST_RUNNING:
650 handle_post_remove_exit();
656 if (snapshot_removal_status == HS_READY) {
659 snapshot_currently_being_removed = NULL;
665 static int wait_for_remove_process(void)
671 snapshot_removal_status == HS_PRE_RUNNING ||
672 snapshot_removal_status == HS_RUNNING ||
673 snapshot_removal_status == HS_POST_RUNNING
675 ret = wait_for_process(remove_pid, &status);
678 return handle_remove_exit(status);
681 static int handle_rsync_exit(int status)
685 if (!WIFEXITED(status)) {
686 DSS_ERROR_LOG("rsync process %d died involuntary\n", (int)create_pid);
687 ret = -E_INVOLUNTARY_EXIT;
688 snapshot_creation_status = HS_READY;
691 es = WEXITSTATUS(status);
693 * Restart rsync on non-fatal errors:
694 * 12: Error in rsync protocol data stream
695 * 13: Errors with program diagnostics
697 if (es == 12 || es == 13) {
698 DSS_WARNING_LOG("rsync process %d returned %d -- restarting\n",
699 (int)create_pid, es);
700 snapshot_creation_status = HS_NEEDS_RESTART;
701 next_snapshot_time = get_current_time() + 60;
705 if (es != 0 && es != 23 && es != 24) {
706 DSS_ERROR_LOG("rsync process %d returned %d\n", (int)create_pid, es);
707 ret = -E_BAD_EXIT_CODE;
708 snapshot_creation_status = HS_READY;
711 ret = rename_incomplete_snapshot(current_snapshot_creation_time);
714 snapshot_creation_status = HS_SUCCESS;
715 free(name_of_reference_snapshot);
716 name_of_reference_snapshot = NULL;
719 create_process_stopped = 0;
723 static int handle_pre_create_hook_exit(int status)
726 static int warn_count;
728 if (!WIFEXITED(status)) {
729 snapshot_creation_status = HS_READY;
730 ret = -E_INVOLUNTARY_EXIT;
733 es = WEXITSTATUS(status);
736 DSS_NOTICE_LOG("pre_create_hook %s returned %d\n",
737 conf.pre_create_hook_arg, es);
738 DSS_NOTICE_LOG("deferring snapshot creation...\n");
739 warn_count = 60; /* warn only once per hour */
741 next_snapshot_time = get_current_time() + 60;
742 snapshot_creation_status = HS_READY;
747 snapshot_creation_status = HS_PRE_SUCCESS;
754 static int handle_sigchld(void)
757 int status, ret = reap_child(&pid, &status);
762 if (pid == create_pid) {
763 switch (snapshot_creation_status) {
765 return handle_pre_create_hook_exit(status);
767 return handle_rsync_exit(status);
768 case HS_POST_RUNNING:
769 snapshot_creation_status = HS_READY;
772 DSS_EMERG_LOG("BUG: create can't die in status %d\n",
773 snapshot_creation_status);
777 if (pid == remove_pid) {
778 ret = handle_remove_exit(status);
783 DSS_EMERG_LOG("BUG: unknown process %d died\n", (int)pid);
787 static int check_config(void)
789 if (conf.unit_interval_arg <= 0) {
790 DSS_ERROR_LOG("bad unit interval: %i\n", conf.unit_interval_arg);
791 return -E_INVALID_NUMBER;
793 DSS_DEBUG_LOG("unit interval: %i day(s)\n", conf.unit_interval_arg);
794 if (conf.num_intervals_arg <= 0) {
795 DSS_ERROR_LOG("bad number of intervals %i\n", conf.num_intervals_arg);
796 return -E_INVALID_NUMBER;
798 DSS_DEBUG_LOG("number of intervals: %i\n", conf.num_intervals_arg);
802 static int parse_config_file(int override)
807 char *old_logfile_arg = NULL;
808 int old_daemon_given = 0;
810 if (conf.config_file_given)
811 config_file = dss_strdup(conf.config_file_arg);
813 char *home = get_homedir();
814 config_file = make_message("%s/.dssrc", home);
817 if (override) { /* SIGHUP */
818 if (conf.logfile_given)
819 old_logfile_arg = dss_strdup(conf.logfile_arg);
820 old_daemon_given = conf.daemon_given;
823 ret = stat(config_file, &statbuf);
824 if (ret && conf.config_file_given) {
825 ret = -ERRNO_TO_DSS_ERROR(errno);
826 DSS_ERROR_LOG("failed to stat config file %s\n", config_file);
830 struct cmdline_parser_params params = {
831 .override = override,
834 .check_ambiguity = 0,
837 if (override) { /* invalidate all rsync options */
840 for (i = 0; i < conf.rsync_option_given; i++) {
841 free(conf.rsync_option_arg[i]);
842 conf.rsync_option_arg[i] = NULL;
844 conf.rsync_option_given = 0;
846 cmdline_parser_config_file(config_file, &conf, ¶ms);
848 ret = check_config();
852 /* don't change daemon mode on SIGHUP */
853 conf.daemon_given = old_daemon_given;
856 if (conf.logfile_given)
857 free(old_logfile_arg);
858 else if (conf.daemon_given) { /* re-use old logfile */
859 conf.logfile_arg = old_logfile_arg;
860 conf.logfile_given = 1;
863 if (conf.logfile_given) {
864 logfile = open_log(conf.logfile_arg);
865 log_welcome(conf.loglevel_arg);
867 DSS_DEBUG_LOG("loglevel: %d\n", conf.loglevel_arg);
868 // cmdline_parser_dump(logfile? logfile : stdout, &conf);
872 DSS_EMERG_LOG("%s\n", dss_strerror(-ret));
876 static int change_to_dest_dir(void)
878 DSS_INFO_LOG("changing cwd to %s\n", conf.dest_dir_arg);
879 return dss_chdir(conf.dest_dir_arg);
882 static int handle_sighup(void)
886 DSS_NOTICE_LOG("SIGHUP\n");
887 ret = parse_config_file(1);
890 return change_to_dest_dir();
893 static int handle_signal(void)
895 int sig, ret = next_signal();
903 restart_create_process();
904 kill_process(create_pid);
905 kill_process(remove_pid);
909 ret = handle_sighup();
912 ret = handle_sigchld();
917 DSS_ERROR_LOG("%s\n", dss_strerror(-ret));
922 * We can not use rsync locally if the local user is different from the remote
923 * user or if the src dir is not on the local host (or both).
925 static int use_rsync_locally(char *logname)
927 char *h = conf.remote_host_arg;
929 if (strcmp(h, "localhost") && strcmp(h, "127.0.0.1"))
931 if (conf.remote_user_given && strcmp(conf.remote_user_arg, logname))
936 static void create_rsync_argv(char ***argv, int64_t *num)
940 struct snapshot_list sl;
942 dss_get_snapshot_list(&sl);
943 assert(!name_of_reference_snapshot);
944 name_of_reference_snapshot = name_of_newest_complete_snapshot(&sl);
945 free_snapshot_list(&sl);
947 *argv = dss_malloc((15 + conf.rsync_option_given) * sizeof(char *));
948 (*argv)[i++] = dss_strdup("rsync");
949 (*argv)[i++] = dss_strdup("-aq");
950 (*argv)[i++] = dss_strdup("--delete");
951 for (j = 0; j < conf.rsync_option_given; j++)
952 (*argv)[i++] = dss_strdup(conf.rsync_option_arg[j]);
953 if (name_of_reference_snapshot) {
954 DSS_INFO_LOG("using %s as reference\n", name_of_reference_snapshot);
955 (*argv)[i++] = make_message("--link-dest=../%s",
956 name_of_reference_snapshot);
958 DSS_INFO_LOG("no suitable reference snapshot found\n");
959 logname = dss_logname();
960 if (use_rsync_locally(logname))
961 (*argv)[i++] = dss_strdup(conf.source_dir_arg);
963 (*argv)[i++] = make_message("%s@%s:%s/", conf.remote_user_given?
964 conf.remote_user_arg : logname,
965 conf.remote_host_arg, conf.source_dir_arg);
967 *num = get_current_time();
968 (*argv)[i++] = incomplete_name(*num);
970 for (j = 0; j < i; j++)
971 DSS_DEBUG_LOG("argv[%d] = %s\n", j, (*argv)[j]);
974 static void free_rsync_argv(char **argv)
980 for (i = 0; argv[i]; i++)
985 static int create_snapshot(char **argv)
987 int ret, fds[3] = {0, 0, 0};
990 name = incomplete_name(current_snapshot_creation_time);
991 DSS_NOTICE_LOG("creating new snapshot %s\n", name);
993 ret = dss_exec(&create_pid, argv[0], argv, fds);
996 snapshot_creation_status = HS_RUNNING;
1000 static int select_loop(void)
1003 /* check every 60 seconds for free disk space */
1005 char **rsync_argv = NULL;
1009 struct timeval *tvp;
1012 tvp = NULL; /* sleep until rm hook/process dies */
1013 else { /* sleep one minute */
1019 FD_SET(signal_pipe, &rfds);
1020 DSS_DEBUG_LOG("tvp: %p, tv_sec : %lu\n", tvp, (long unsigned) tv.tv_sec);
1021 ret = dss_select(signal_pipe + 1, &rfds, NULL, tvp);
1024 if (FD_ISSET(signal_pipe, &rfds)) {
1025 ret = handle_signal();
1031 if (snapshot_removal_status == HS_PRE_SUCCESS) {
1037 if (snapshot_removal_status == HS_SUCCESS) {
1038 ret = post_remove_hook();
1043 ret = try_to_free_disk_space();
1046 if (snapshot_removal_status != HS_READY) {
1047 stop_create_process();
1050 restart_create_process();
1051 switch (snapshot_creation_status) {
1053 if (!next_snapshot_is_due())
1055 ret = pre_create_hook();
1059 case HS_PRE_RUNNING:
1061 case HS_POST_RUNNING:
1063 case HS_PRE_SUCCESS:
1064 free_rsync_argv(rsync_argv);
1065 create_rsync_argv(&rsync_argv, ¤t_snapshot_creation_time);
1067 case HS_NEEDS_RESTART:
1068 ret = create_snapshot(rsync_argv);
1073 ret = post_create_hook();
1083 static void exit_hook(int exit_code)
1085 int fds[3] = {0, 0, 0};
1086 char *argv[] = {conf.exit_hook_arg, dss_strerror(-exit_code), NULL};
1089 if (!conf.exit_hook_given)
1091 DSS_NOTICE_LOG("executing %s %s\n", argv[0], argv[1]);
1092 dss_exec(&pid, conf.exit_hook_arg, argv, fds);
1095 static int com_run(void)
1099 if (conf.dry_run_given) {
1100 DSS_ERROR_LOG("dry_run not supported by this command\n");
1103 ret = install_sighandler(SIGHUP);
1106 ret = select_loop();
1107 if (ret >= 0) /* impossible */
1113 static int com_prune(void)
1116 struct snapshot_list sl;
1117 struct snapshot *victim;
1118 struct disk_space ds;
1121 ret = get_disk_space(".", &ds);
1124 log_disk_space(&ds);
1125 dss_get_snapshot_list(&sl);
1127 victim = find_outdated_snapshot(&sl);
1131 victim = find_redundant_snapshot(&sl);
1137 if (conf.dry_run_given) {
1138 dss_msg("%s snapshot %s (interval = %i)\n",
1139 why, victim->name, victim->interval);
1143 ret = pre_remove_hook(victim, why);
1146 if (snapshot_removal_status == HS_PRE_RUNNING) {
1147 ret = wait_for_remove_process();
1150 if (snapshot_removal_status != HS_PRE_SUCCESS)
1156 ret = wait_for_remove_process();
1159 if (snapshot_removal_status != HS_SUCCESS)
1161 ret = post_remove_hook();
1164 if (snapshot_removal_status != HS_POST_RUNNING)
1166 ret = wait_for_remove_process();
1171 free_snapshot_list(&sl);
1175 static int com_create(void)
1180 if (conf.dry_run_given) {
1183 create_rsync_argv(&rsync_argv, ¤t_snapshot_creation_time);
1184 for (i = 0; rsync_argv[i]; i++) {
1186 msg = make_message("%s%s%s", tmp? tmp : "",
1187 tmp? " " : "", rsync_argv[i]);
1190 free_rsync_argv(rsync_argv);
1191 dss_msg("%s\n", msg);
1195 ret = pre_create_hook();
1199 ret = wait_for_process(create_pid, &status);
1202 ret = handle_pre_create_hook_exit(status);
1203 if (ret <= 0) /* error, or pre-create failed */
1206 create_rsync_argv(&rsync_argv, ¤t_snapshot_creation_time);
1207 ret = create_snapshot(rsync_argv);
1210 ret = wait_for_process(create_pid, &status);
1213 ret = handle_rsync_exit(status);
1218 ret = wait_for_process(create_pid, &status);
1220 free_rsync_argv(rsync_argv);
1224 static int com_ls(void)
1227 struct snapshot_list sl;
1230 dss_get_snapshot_list(&sl);
1231 FOR_EACH_SNAPSHOT(s, i, &sl) {
1233 if (s->flags & SS_COMPLETE)
1234 d = (s->completion_time - s->creation_time) / 60;
1235 dss_msg("%u\t%s\t%3" PRId64 ":%02" PRId64 "\n", s->interval, s->name, d/60, d%60);
1237 free_snapshot_list(&sl);
1241 static int setup_signal_handling(void)
1245 DSS_INFO_LOG("setting up signal handlers\n");
1246 signal_pipe = signal_init(); /* always successful */
1247 ret = install_sighandler(SIGINT);
1250 ret = install_sighandler(SIGTERM);
1253 return install_sighandler(SIGCHLD);
1257 * The main function of dss.
1259 * \param argc Usual argument count.
1260 * \param argv Usual argument vector.
1262 int main(int argc, char **argv)
1265 struct cmdline_parser_params params = {
1268 .check_required = 0,
1269 .check_ambiguity = 0,
1273 cmdline_parser_ext(argc, argv, &conf, ¶ms); /* aborts on errors */
1274 ret = parse_config_file(0);
1277 if (conf.daemon_given)
1279 ret = change_to_dest_dir();
1282 ret = setup_signal_handling();
1285 ret = call_command_handler();
1288 DSS_EMERG_LOG("%s\n", dss_strerror(-ret));
1289 exit(ret >= 0? EXIT_SUCCESS : EXIT_FAILURE);