1 /* SPDX-License-Identifier: GPL-2.0 */
24 #include "gcc-compat.h"
38 #define CMD_PTR(_cname) lls_cmd(LSG_DSS_CMD_ ## _cname, dss_suite)
39 #define OPT_RESULT(_cname, _oname) (lls_opt_result(\
40 LSG_DSS_ ## _cname ## _OPT_ ## _oname, (CMD_PTR(_cname) == CMD_PTR(DSS))? lpr : sublpr))
41 #define OPT_GIVEN(_cname, _oname) (lls_opt_given(OPT_RESULT(_cname, _oname)))
42 #define OPT_STRING_VAL(_cname, _oname) (lls_string_val(0, \
43 OPT_RESULT(_cname, _oname)))
44 #define OPT_UINT32_VAL(_cname, _oname) (lls_uint32_val(0, \
45 OPT_RESULT(_cname, _oname)))
47 struct dss_user_data
{int (*handler
)(void);};
48 #define EXPORT_CMD_HANDLER(_cmd) const struct dss_user_data \
49 lsg_dss_com_ ## _cmd ## _user_data = { \
50 .handler = com_ ## _cmd \
54 * Command line and active options. We need to keep a copy of the parsed
55 * command line options for the SIGHUP case where we merge the command line
56 * options and the new config file options.
58 static struct lls_parse_result
*cmdline_lpr
, *lpr
;
60 /** Parsed subcommand options. */
61 static struct lls_parse_result
*cmdline_sublpr
, *sublpr
;
62 /* The executing subcommand (NULL at startup). */
63 static const struct lls_command
*subcmd
;
64 /** Wether daemon_init() was called. */
65 static bool daemonized
;
66 /** Non-NULL if we log to a file. */
68 /** The read end of the signal pipe */
69 static int signal_pipe
;
70 /** Process id of current pre-create-hook/rsync/post-create-hook process. */
71 static pid_t create_pid
;
72 /** Whether the pre-create-hook/rsync/post-create-hook is currently stopped. */
73 static int create_process_stopped
;
74 /** How many times in a row the rsync command failed. */
75 static int num_consecutive_rsync_errors
;
76 /** Process id of current pre-remove/rm/post-remove process. */
77 static pid_t remove_pid
;
78 /** When the next snapshot is due. */
79 static int64_t next_snapshot_time
;
80 /** When to try to remove something. */
81 static struct timeval next_removal_check
;
82 /** Creation time of the snapshot currently being created. */
83 static int64_t current_snapshot_creation_time
;
84 /* Set by the pre-rm hook, cleared by handle_remove_exit(). */
85 struct snapshot
*snapshot_currently_being_removed
;
86 /** Needed by the post-create hook. */
87 static char *path_to_last_complete_snapshot
;
88 static char *name_of_reference_snapshot
;
89 /** \sa \ref snap.h for details. */
90 enum hook_status snapshot_creation_status
;
91 /** \sa \ref snap.h for details. */
92 enum hook_status snapshot_removal_status
;
96 static const char *hook_status_description
[] = {HOOK_STATUS_ARRAY
};
98 /* may be called with ds == NULL. */
99 static int disk_space_low(struct disk_space
*ds
)
101 struct disk_space ds_struct
;
105 int ret
= get_disk_space(".", &ds_struct
);
110 val
= OPT_UINT32_VAL(DSS
, MIN_FREE_MB
);
112 if (ds
->free_mb
< val
)
114 val
= OPT_UINT32_VAL(DSS
, MIN_FREE_PERCENT
);
116 if (ds
->percent_free
< val
)
118 val
= OPT_UINT32_VAL(DSS
, MIN_FREE_PERCENT_INODES
);
120 if (ds
->percent_free_inodes
< val
)
125 static void dump_dss_config(const char *msg
)
127 const char dash
[] = "-----------------------------";
130 FILE *log
= logfile
? logfile
: stderr
;
131 struct disk_space ds
;
132 int64_t now
= get_current_time();
134 if (OPT_UINT32_VAL(DSS
, LOGLEVEL
) > INFO
)
137 fprintf(log
, "%s <%s config> %s\n", dash
, msg
, dash
);
138 fprintf(log
, "\n*** disk space ***\n\n");
139 ret
= get_disk_space(".", &ds
);
141 DSS_INFO_LOG(("disk space low: %s\n", disk_space_low(&ds
)?
145 DSS_ERROR_LOG(("can not get free disk space: %s\n",
146 dss_strerror(-ret
)));
148 /* we continue on errors from get_disk_space */
150 fprintf(log
, "\n*** non-default options ***\n\n");
151 lopsub_dump
= lls_dump_parse_result(lpr
, CMD_PTR(DSS
), true);
152 fprintf(log
, "%s", lopsub_dump
);
154 fprintf(log
, "\n*** non-default options for \"run\" ***\n\n");
155 lopsub_dump
= lls_dump_parse_result(lpr
, CMD_PTR(RUN
), true);
156 fprintf(log
, "%s", lopsub_dump
);
158 fprintf(log
, "\n*** internal state ***\n\n");
162 "snapshot_currently_being_removed: %s\n"
163 "path_to_last_complete_snapshot: %s\n"
164 "reference_snapshot: %s\n"
165 "snapshot_creation_status: %s\n"
166 "snapshot_removal_status: %s\n"
167 "num_consecutive_rsync_errors: %d\n"
170 logfile
? OPT_STRING_VAL(RUN
, LOGFILE
) : "stderr",
171 snapshot_currently_being_removed
?
172 snapshot_currently_being_removed
->name
: "(none)",
173 path_to_last_complete_snapshot
?
174 path_to_last_complete_snapshot
: "(none)",
175 name_of_reference_snapshot
?
176 name_of_reference_snapshot
: "(none)",
177 hook_status_description
[snapshot_creation_status
],
178 hook_status_description
[snapshot_removal_status
],
179 num_consecutive_rsync_errors
183 "create_pid: %" PRId32
"\n"
184 "create process is %sstopped\n"
187 create_process_stopped
? "" : "not "
190 fprintf(log
, "remove_pid: %" PRId32
"\n", remove_pid
);
191 if (next_snapshot_time
!= 0)
192 fprintf(log
, "next snapshot due in %" PRId64
" seconds\n",
193 next_snapshot_time
- now
);
194 if (current_snapshot_creation_time
!= 0)
195 fprintf(log
, "current_snapshot_creation_time: %"
196 PRId64
" (%" PRId64
" seconds ago)\n",
197 current_snapshot_creation_time
,
198 now
- current_snapshot_creation_time
200 if (next_removal_check
.tv_sec
!= 0) {
201 fprintf(log
, "next removal check: %llu (%llu seconds ago)\n",
202 (long long unsigned)next_removal_check
.tv_sec
,
203 now
- (long long unsigned)next_removal_check
.tv_sec
207 fprintf(log
, "%s </%s config> %s\n", dash
, msg
, dash
);
210 static int loglevel
= -1;
211 static const char *location_file
= NULL
;
212 static int location_line
= -1;
213 static const char *location_func
= NULL
;
215 void dss_log_set_params(int ll
, const char *file
, int line
, const char *func
)
218 location_file
= file
;
219 location_line
= line
;
220 location_func
= func
;
224 * The log function of dss.
226 * \param ll Loglevel.
227 * \param fml Usual format string.
229 * All DSS_XXX_LOG() macros use this function.
231 __printf_1_2
void dss_log(const char* fmt
,...)
238 int lpr_ll
= lpr
? OPT_UINT32_VAL(DSS
, LOGLEVEL
) : WARNING
;
240 if (loglevel
< lpr_ll
)
242 outfd
= logfile
? logfile
: stderr
;
243 if (subcmd
== CMD_PTR(RUN
)) {
246 strftime(str
, sizeof(str
), "%b %d %H:%M:%S", tm
);
247 fprintf(outfd
, "%s ", str
);
249 fprintf(outfd
, "%i: ", loglevel
);
251 if (subcmd
== CMD_PTR(RUN
))
252 #ifdef DSS_NO_FUNC_NAMES
253 fprintf(outfd
, "%s:%d: ", location_file
, location_line
);
255 fprintf(outfd
, "%s: ", location_func
);
258 vfprintf(outfd
, fmt
, argp
);
263 * Print a message either to stdout or to the log file.
265 static __printf_1_2
void dss_msg(const char* fmt
,...)
267 FILE *outfd
= logfile
? logfile
: stdout
;
270 vfprintf(outfd
, fmt
, argp
);
274 static char *get_config_file_name(void)
276 char *home
, *config_file
;
278 if (OPT_GIVEN(DSS
, CONFIG_FILE
))
279 return dss_strdup(OPT_STRING_VAL(DSS
, CONFIG_FILE
));
280 home
= get_homedir();
281 config_file
= make_message("%s/.dssrc", home
);
286 static int send_signal(int sig
, bool wait
)
289 char *config_file
= get_config_file_name();
290 int ret
= get_dss_pid(config_file
, &pid
);
297 if (OPT_GIVEN(DSS
, DRY_RUN
)) {
298 dss_msg("%d\n", (int)pid
);
301 DSS_NOTICE_LOG(("sending signal %d to pid %d\n", sig
, (int)pid
));
302 ret
= kill(pid
, sig
);
304 return -ERRNO_TO_DSS_ERROR(errno
);
308 ts
.tv_sec
= ms
/ 1000;
309 ts
.tv_nsec
= (ms
% 1000) * 1000 * 1000;
310 ret
= nanosleep(&ts
, NULL
);
312 return -ERRNO_TO_DSS_ERROR(errno
);
316 return -ERRNO_TO_DSS_ERROR(errno
);
321 return -E_KILL_TIMEOUT
;
325 const char * const name
;
330 * The table below was taken 2016 from proc/sig.c of procps-3.2.8. Copyright
331 * 1998-2003 by Albert Cahalan, GPLv2.
333 static const struct signal_info signal_table
[] = {
334 {"ABRT", SIGABRT
}, /* IOT */
337 {"CHLD", SIGCHLD
}, /* CLD */
346 {"POLL", SIGPOLL
}, /* IO */
355 {"STKFLT", SIGSTKFLT
},
358 {"SYS", SIGSYS
}, /* UNUSED */
367 {"VTALRM", SIGVTALRM
},
373 #define SIGNAL_TABLE_SIZE (sizeof(signal_table) / sizeof(signal_table[0]))
378 static int com_kill(void)
380 bool w_given
= OPT_GIVEN(KILL
, WAIT
);
381 const char *arg
= OPT_STRING_VAL(KILL
, SIGNAL
);
384 if (*arg
>= '0' && *arg
<= '9') {
386 ret
= dss_atoi64(arg
, &val
);
389 if (val
< 0 || val
> SIGRTMAX
)
390 return -ERRNO_TO_DSS_ERROR(EINVAL
);
391 return send_signal(val
, w_given
);
393 if (strncasecmp(arg
, "sig", 3) == 0)
395 if (strcasecmp(arg
, "CLD") == 0)
396 return send_signal(SIGCHLD
, w_given
);
397 if (strcasecmp(arg
, "IOT") == 0)
398 return send_signal(SIGABRT
, w_given
);
399 for (i
= 0; i
< SIGNAL_TABLE_SIZE
; i
++)
400 if (strcasecmp(arg
, signal_table
[i
].name
) == 0)
401 return send_signal(signal_table
[i
].num
, w_given
);
402 DSS_ERROR_LOG(("invalid sigspec: %s\n", arg
));
403 return -ERRNO_TO_DSS_ERROR(EINVAL
);
405 EXPORT_CMD_HANDLER(kill
);
407 static void dss_get_snapshot_list(struct snapshot_list
*sl
)
409 get_snapshot_list(sl
, OPT_UINT32_VAL(DSS
, UNIT_INTERVAL
),
410 OPT_UINT32_VAL(DSS
, NUM_INTERVALS
));
413 static int64_t compute_next_snapshot_time(void)
415 int64_t x
= 0, now
= get_current_time(), unit_interval
416 = 24 * 3600 * OPT_UINT32_VAL(DSS
, UNIT_INTERVAL
), ret
,
417 last_completion_time
;
418 unsigned wanted
= desired_number_of_snapshots(0,
419 OPT_UINT32_VAL(DSS
, NUM_INTERVALS
)),
422 struct snapshot
*s
= NULL
;
423 struct snapshot_list sl
;
425 dss_get_snapshot_list(&sl
);
426 FOR_EACH_SNAPSHOT(s
, i
, &sl
) {
427 if (!(s
->flags
& SS_COMPLETE
))
430 x
+= s
->completion_time
- s
->creation_time
;
431 last_completion_time
= s
->completion_time
;
436 if (num_complete
== 0)
438 x
/= num_complete
; /* avg time to create one snapshot */
439 if (unit_interval
< x
* wanted
) /* oops, no sleep at all */
441 ret
= last_completion_time
+ unit_interval
/ wanted
- x
;
443 free_snapshot_list(&sl
);
447 static inline void invalidate_next_snapshot_time(void)
449 next_snapshot_time
= 0;
452 static inline int next_snapshot_time_is_valid(void)
454 return next_snapshot_time
!= 0;
457 static int next_snapshot_is_due(void)
459 int64_t now
= get_current_time();
461 if (!next_snapshot_time_is_valid())
462 next_snapshot_time
= compute_next_snapshot_time();
463 if (next_snapshot_time
<= now
) {
464 DSS_DEBUG_LOG(("next snapshot: now\n"));
467 DSS_DEBUG_LOG(("next snapshot due in %" PRId64
" seconds\n",
468 next_snapshot_time
- now
));
472 static void pre_create_hook(void)
474 assert(snapshot_creation_status
== HS_READY
);
475 /* make sure that the next snapshot time will be recomputed */
476 invalidate_next_snapshot_time();
477 DSS_DEBUG_LOG(("executing %s\n", OPT_STRING_VAL(DSS
, PRE_CREATE_HOOK
)));
478 dss_exec_cmdline_pid(&create_pid
, OPT_STRING_VAL(DSS
, PRE_CREATE_HOOK
));
479 snapshot_creation_status
= HS_PRE_RUNNING
;
482 static void pre_remove_hook(struct snapshot
*s
, const char *why
)
488 DSS_DEBUG_LOG(("%s snapshot %s\n", why
, s
->name
));
489 assert(snapshot_removal_status
== HS_READY
);
490 assert(remove_pid
== 0);
491 assert(!snapshot_currently_being_removed
);
493 snapshot_currently_being_removed
= dss_malloc(sizeof(struct snapshot
));
494 *snapshot_currently_being_removed
= *s
;
495 snapshot_currently_being_removed
->name
= dss_strdup(s
->name
);
497 cmd
= make_message("%s %s/%s", OPT_STRING_VAL(DSS
, PRE_REMOVE_HOOK
),
498 OPT_STRING_VAL(DSS
, DEST_DIR
), s
->name
);
499 DSS_DEBUG_LOG(("executing %s\n", cmd
));
500 dss_exec_cmdline_pid(&remove_pid
, cmd
);
502 snapshot_removal_status
= HS_PRE_RUNNING
;
505 static int exec_rm(void)
507 struct snapshot
*s
= snapshot_currently_being_removed
;
508 char *new_name
= being_deleted_name(s
);
517 assert(snapshot_removal_status
== HS_PRE_SUCCESS
);
518 assert(remove_pid
== 0);
520 DSS_NOTICE_LOG(("removing %s (interval = %i)\n", s
->name
, s
->interval
));
521 ret
= dss_rename(s
->name
, new_name
);
524 dss_exec(&remove_pid
, argv
[0], argv
);
525 snapshot_removal_status
= HS_RUNNING
;
531 static int snapshot_is_being_created(struct snapshot
*s
)
533 return s
->creation_time
== current_snapshot_creation_time
;
536 static struct snapshot
*find_orphaned_snapshot(struct snapshot_list
*sl
)
541 DSS_DEBUG_LOG(("looking for old incomplete snapshots\n"));
542 FOR_EACH_SNAPSHOT(s
, i
, sl
) {
543 if (snapshot_is_being_created(s
))
546 * We know that no rm is currently running, so if s is marked
547 * as being deleted, a previously started rm must have failed.
549 if (s
->flags
& SS_BEING_DELETED
)
552 if (s
->flags
& SS_COMPLETE
) /* good snapshot */
555 * This snapshot is incomplete and it is not the snapshot
556 * currently being created. However, we must not remove it if
557 * rsync is about to be restarted. As only the newest snapshot
558 * can be restarted, this snapshot is orphaned if it is not the
559 * newest snapshot or if we are not about to restart rsync.
561 if (get_newest_snapshot(sl
) != s
)
563 if (snapshot_creation_status
!= HS_NEEDS_RESTART
)
566 /* no orphaned snapshots */
570 static int is_reference_snapshot(struct snapshot
*s
)
572 if (!name_of_reference_snapshot
)
574 return strcmp(s
->name
, name_of_reference_snapshot
)? 0 : 1;
577 static struct snapshot
*find_redundant_snapshot(struct snapshot_list
*sl
)
581 unsigned missing
= 0;
582 uint32_t N
= OPT_UINT32_VAL(DSS
, NUM_INTERVALS
);
584 DSS_DEBUG_LOG(("looking for intervals containing too many snapshots\n"));
585 for (interval
= N
- 1; interval
>= 0; interval
--) {
586 unsigned keep
= desired_number_of_snapshots(interval
, N
);
587 unsigned num
= sl
->interval_count
[interval
];
588 struct snapshot
*victim
= NULL
, *prev
= NULL
;
589 int64_t score
= LONG_MAX
;
592 missing
+= keep
- num
;
593 if (keep
+ missing
>= num
)
595 /* redundant snapshot in this interval, pick snapshot with lowest score */
596 FOR_EACH_SNAPSHOT(s
, i
, sl
) {
599 if (snapshot_is_being_created(s
))
601 if (is_reference_snapshot(s
))
603 if (s
->interval
> interval
) {
607 if (s
->interval
< interval
)
615 /* check if s is a better victim */
616 this_score
= s
->creation_time
- prev
->creation_time
;
617 assert(this_score
>= 0);
618 if (this_score
< score
) {
630 static struct snapshot
*find_outdated_snapshot(struct snapshot_list
*sl
)
635 DSS_DEBUG_LOG(("looking for snapshots belonging to intervals >= %d\n",
636 OPT_UINT32_VAL(DSS
, NUM_INTERVALS
)));
637 FOR_EACH_SNAPSHOT(s
, i
, sl
) {
638 if (snapshot_is_being_created(s
))
640 if (is_reference_snapshot(s
))
642 if (s
->interval
< OPT_UINT32_VAL(DSS
, NUM_INTERVALS
))
649 static struct snapshot
*find_oldest_removable_snapshot(struct snapshot_list
*sl
)
652 struct snapshot
*s
, *ref
= NULL
;
654 num_complete
= num_complete_snapshots(sl
);
655 if (num_complete
<= OPT_UINT32_VAL(DSS
, MIN_COMPLETE
))
657 FOR_EACH_SNAPSHOT(s
, i
, sl
) {
658 if (snapshot_is_being_created(s
))
660 if (is_reference_snapshot(s
)) { /* avoid this one */
664 DSS_INFO_LOG(("oldest removable snapshot: %s\n", s
->name
));
668 DSS_WARNING_LOG(("removing reference snapshot %s\n", ref
->name
));
672 static int rename_incomplete_snapshot(int64_t start
)
679 * We don't want the dss_rename() below to fail with EEXIST because the
680 * last complete snapshot was created (and completed) in the same
681 * second as this one.
683 while ((now
= get_current_time()) == start
)
685 free(path_to_last_complete_snapshot
);
686 ret
= complete_name(start
, now
, &path_to_last_complete_snapshot
);
689 old_name
= incomplete_name(start
);
690 ret
= dss_rename(old_name
, path_to_last_complete_snapshot
);
692 DSS_NOTICE_LOG(("%s -> %s\n", old_name
,
693 path_to_last_complete_snapshot
));
698 static int try_to_free_disk_space(void)
701 struct snapshot_list sl
;
702 struct snapshot
*victim
;
707 ret
= disk_space_low(NULL
);
710 low_disk_space
= ret
;
711 gettimeofday(&now
, NULL
);
712 if (tv_diff(&next_removal_check
, &now
, NULL
) > 0)
714 if (!low_disk_space
) {
715 if (OPT_GIVEN(DSS
, KEEP_REDUNDANT
))
717 if (snapshot_creation_status
!= HS_READY
)
719 if (next_snapshot_is_due())
723 * Idle and --keep_redundant not given, or low disk space. Look at
724 * existing snapshots.
726 dss_get_snapshot_list(&sl
);
729 * Don't remove anything if there is free space and we have fewer
730 * snapshots than configured, plus one. This way there is always one
731 * snapshot that can be recycled.
733 if (!low_disk_space
&& sl
.num_snapshots
<=
734 1 << OPT_UINT32_VAL(DSS
, NUM_INTERVALS
))
737 victim
= find_outdated_snapshot(&sl
);
741 victim
= find_redundant_snapshot(&sl
);
745 victim
= find_orphaned_snapshot(&sl
);
748 /* try harder only if disk space is low */
751 DSS_WARNING_LOG(("disk space low and nothing obvious to remove\n"));
753 victim
= find_oldest_removable_snapshot(&sl
);
756 DSS_CRIT_LOG(("uhuhu: disk space low and nothing to remove\n"));
757 ret
= -ERRNO_TO_DSS_ERROR(ENOSPC
);
760 pre_remove_hook(victim
, why
);
762 free_snapshot_list(&sl
);
766 static void post_create_hook(void)
768 char *cmd
= make_message("%s %s/%s",
769 OPT_STRING_VAL(DSS
, POST_CREATE_HOOK
),
770 OPT_STRING_VAL(DSS
, DEST_DIR
), path_to_last_complete_snapshot
);
771 DSS_NOTICE_LOG(("executing %s\n", cmd
));
772 dss_exec_cmdline_pid(&create_pid
, cmd
);
774 snapshot_creation_status
= HS_POST_RUNNING
;
777 static void post_remove_hook(void)
780 struct snapshot
*s
= snapshot_currently_being_removed
;
784 cmd
= make_message("%s %s/%s", OPT_STRING_VAL(DSS
, POST_REMOVE_HOOK
),
785 OPT_STRING_VAL(DSS
, DEST_DIR
), s
->name
);
786 DSS_NOTICE_LOG(("executing %s\n", cmd
));
787 dss_exec_cmdline_pid(&remove_pid
, cmd
);
789 snapshot_removal_status
= HS_POST_RUNNING
;
792 static void dss_kill(pid_t pid
, int sig
, const char *msg
)
794 const char *signame
, *process_name
;
799 case SIGTERM
: signame
= "TERM"; break;
800 case SIGSTOP
: signame
= "STOP"; break;
801 case SIGCONT
: signame
= "CONT"; break;
802 default: signame
= "????";
805 if (pid
== create_pid
)
806 process_name
= "create";
807 else if (pid
== remove_pid
)
808 process_name
= "remove";
809 else process_name
= "??????";
812 DSS_INFO_LOG(("%s\n", msg
));
813 DSS_DEBUG_LOG(("sending signal %d (%s) to pid %d (%s process)\n",
814 sig
, signame
, (int)pid
, process_name
));
815 if (kill(pid
, sig
) >= 0)
817 DSS_INFO_LOG(("failed to send signal %d (%s) to pid %d (%s process)\n",
818 sig
, signame
, (int)pid
, process_name
));
821 static void stop_create_process(void)
823 if (create_process_stopped
)
825 dss_kill(create_pid
, SIGSTOP
, "suspending create process");
826 create_process_stopped
= 1;
829 static void restart_create_process(void)
831 if (!create_process_stopped
)
833 dss_kill(create_pid
, SIGCONT
, "resuming create process");
834 create_process_stopped
= 0;
838 * Print a log message about the exit status of a child.
840 static void log_termination_msg(pid_t pid
, int status
)
842 if (WIFEXITED(status
))
843 DSS_INFO_LOG(("child %i exited. Exit status: %i\n", (int)pid
,
844 WEXITSTATUS(status
)));
845 else if (WIFSIGNALED(status
))
846 DSS_NOTICE_LOG(("child %i was killed by signal %i\n", (int)pid
,
849 DSS_WARNING_LOG(("child %i terminated abormally\n", (int)pid
));
852 static int wait_for_process(pid_t pid
, int *status
)
856 DSS_DEBUG_LOG(("Waiting for process %d to terminate\n", (int)pid
));
861 FD_SET(signal_pipe
, &rfds
);
862 ret
= dss_select(signal_pipe
+ 1, &rfds
, NULL
, NULL
);
868 if (ret
== SIGCHLD
) {
869 ret
= waitpid(pid
, status
, 0);
872 if (errno
!= EINTR
) { /* error */
873 ret
= -ERRNO_TO_DSS_ERROR(errno
);
877 /* SIGINT or SIGTERM */
878 dss_kill(pid
, SIGTERM
, "killing child process");
881 DSS_ERROR_LOG(("failed to wait for process %d\n", (int)pid
));
883 log_termination_msg(pid
, *status
);
887 static void handle_pre_remove_exit(int status
)
889 if (!WIFEXITED(status
) || WEXITSTATUS(status
) != 0) {
890 snapshot_removal_status
= HS_READY
;
891 gettimeofday(&next_removal_check
, NULL
);
892 next_removal_check
.tv_sec
+= 60;
895 snapshot_removal_status
= HS_PRE_SUCCESS
;
898 static int handle_rm_exit(int status
)
900 if (!WIFEXITED(status
)) {
901 snapshot_removal_status
= HS_READY
;
902 return -E_INVOLUNTARY_EXIT
;
904 if (WEXITSTATUS(status
)) {
905 snapshot_removal_status
= HS_READY
;
906 return -E_BAD_EXIT_CODE
;
908 snapshot_removal_status
= HS_SUCCESS
;
912 static void handle_post_remove_exit(void)
914 snapshot_removal_status
= HS_READY
;
917 static int handle_remove_exit(int status
)
920 struct snapshot
*s
= snapshot_currently_being_removed
;
923 switch (snapshot_removal_status
) {
925 handle_pre_remove_exit(status
);
929 ret
= handle_rm_exit(status
);
931 case HS_POST_RUNNING
:
932 handle_post_remove_exit();
938 if (snapshot_removal_status
== HS_READY
) {
941 snapshot_currently_being_removed
= NULL
;
947 static int wait_for_remove_process(void)
953 snapshot_removal_status
== HS_PRE_RUNNING
||
954 snapshot_removal_status
== HS_RUNNING
||
955 snapshot_removal_status
== HS_POST_RUNNING
957 ret
= wait_for_process(remove_pid
, &status
);
960 return handle_remove_exit(status
);
963 static int handle_rsync_exit(int status
)
967 if (!WIFEXITED(status
)) {
968 DSS_ERROR_LOG(("rsync process %d died involuntary\n", (int)create_pid
));
969 ret
= -E_INVOLUNTARY_EXIT
;
970 snapshot_creation_status
= HS_READY
;
973 es
= WEXITSTATUS(status
);
975 * Restart rsync on non-fatal errors:
976 * 24: Partial transfer due to vanished source files
978 if (es
!= 0 && es
!= 24) {
979 DSS_WARNING_LOG(("rsync exit code %d, error count %d\n",
980 es
, ++num_consecutive_rsync_errors
));
981 if (!logfile
) { /* called by com_run() */
982 ret
= -E_BAD_EXIT_CODE
;
985 if (num_consecutive_rsync_errors
>
986 OPT_UINT32_VAL(RUN
, MAX_RSYNC_ERRORS
)) {
987 ret
= -E_TOO_MANY_RSYNC_ERRORS
;
988 snapshot_creation_status
= HS_READY
;
991 DSS_WARNING_LOG(("restarting rsync process\n"));
992 snapshot_creation_status
= HS_NEEDS_RESTART
;
993 next_snapshot_time
= get_current_time() + 60;
997 num_consecutive_rsync_errors
= 0;
998 ret
= rename_incomplete_snapshot(current_snapshot_creation_time
);
1001 snapshot_creation_status
= HS_SUCCESS
;
1002 free(name_of_reference_snapshot
);
1003 name_of_reference_snapshot
= NULL
;
1005 create_process_stopped
= 0;
1009 static int handle_pre_create_hook_exit(int status
)
1012 static int warn_count
;
1014 if (!WIFEXITED(status
)) {
1015 snapshot_creation_status
= HS_READY
;
1016 ret
= -E_INVOLUNTARY_EXIT
;
1019 es
= WEXITSTATUS(status
);
1021 if (!warn_count
--) {
1022 DSS_NOTICE_LOG(("pre_create_hook %s returned %d\n",
1023 OPT_STRING_VAL(DSS
, PRE_CREATE_HOOK
), es
));
1024 DSS_NOTICE_LOG(("deferring snapshot creation...\n"));
1025 warn_count
= 60; /* warn only once per hour */
1027 next_snapshot_time
= get_current_time() + 60;
1028 snapshot_creation_status
= HS_READY
;
1033 snapshot_creation_status
= HS_PRE_SUCCESS
;
1039 static int handle_sigchld(void)
1042 int status
, ret
= reap_child(&pid
, &status
);
1047 if (pid
== create_pid
) {
1048 switch (snapshot_creation_status
) {
1049 case HS_PRE_RUNNING
:
1050 ret
= handle_pre_create_hook_exit(status
);
1053 ret
= handle_rsync_exit(status
);
1055 case HS_POST_RUNNING
:
1056 snapshot_creation_status
= HS_READY
;
1060 DSS_EMERG_LOG(("BUG: create can't die in status %d\n",
1061 snapshot_creation_status
));
1067 if (pid
== remove_pid
) {
1068 ret
= handle_remove_exit(status
);
1073 DSS_EMERG_LOG(("BUG: unknown process %d died\n", (int)pid
));
1077 /* also checks if . is a mountpoint, if --mountpoint was given */
1078 static int change_to_dest_dir(void)
1081 const char *dd
= OPT_STRING_VAL(DSS
, DEST_DIR
);
1082 struct stat dot
, dotdot
;
1084 DSS_INFO_LOG(("changing cwd to %s\n", dd
));
1085 if (chdir(dd
) < 0) {
1086 ret
= -ERRNO_TO_DSS_ERROR(errno
);
1087 DSS_ERROR_LOG(("could not change cwd to %s\n", dd
));
1090 if (!OPT_GIVEN(DSS
, MOUNTPOINT
))
1092 if (stat(".", &dot
) < 0) {
1093 ret
= -ERRNO_TO_DSS_ERROR(errno
);
1094 DSS_ERROR_LOG(("could not stat .\n"));
1097 if (stat("..", &dotdot
) < 0) {
1098 ret
= -ERRNO_TO_DSS_ERROR(errno
);
1099 DSS_ERROR_LOG(("could not stat ..\n"));
1102 if (dot
.st_dev
== dotdot
.st_dev
&& dot
.st_ino
!= dotdot
.st_ino
) {
1103 DSS_ERROR_LOG(("mountpoint check failed for %s\n", dd
));
1104 return -E_MOUNTPOINT
;
1109 static int check_config(void)
1112 uint32_t unit_interval
= OPT_UINT32_VAL(DSS
, UNIT_INTERVAL
);
1113 uint32_t num_intervals
= OPT_UINT32_VAL(DSS
, NUM_INTERVALS
);
1115 if (unit_interval
== 0) {
1116 DSS_ERROR_LOG(("bad unit interval: %i\n", unit_interval
));
1117 return -E_INVALID_NUMBER
;
1119 DSS_DEBUG_LOG(("unit interval: %i day(s)\n", unit_interval
));
1121 if (num_intervals
== 0 || num_intervals
> 30) {
1122 DSS_ERROR_LOG(("bad number of intervals: %i\n", num_intervals
));
1123 return -E_INVALID_NUMBER
;
1125 if (subcmd
== CMD_PTR(RUN
) || subcmd
== CMD_PTR(CREATE
))
1126 if (!OPT_GIVEN(DSS
, SOURCE_DIR
)) {
1127 DSS_ERROR_LOG(("--source-dir required\n"));
1130 if (subcmd
== CMD_PTR(RUN
) || subcmd
== CMD_PTR(CREATE
)
1131 || subcmd
== CMD_PTR(LS
) || subcmd
== CMD_PTR(PRUNE
)) {
1132 if (!OPT_GIVEN(DSS
, DEST_DIR
)) {
1133 DSS_ERROR_LOG(("--dest-dir required\n"));
1136 ret
= change_to_dest_dir();
1140 DSS_DEBUG_LOG(("number of intervals: %i\n", num_intervals
));
1144 static int lopsub_error(int lopsub_ret
, char **errctx
)
1146 const char *msg
= lls_strerror(-lopsub_ret
);
1148 DSS_ERROR_LOG(("%s: %s\n", *errctx
, msg
));
1150 DSS_ERROR_LOG(("%s\n", msg
));
1156 static int parse_config_file(bool sighup
, const struct lls_command
*cmd
)
1159 char *config_file
= get_config_file_name();
1160 struct stat statbuf
;
1164 char **cf_argv
, *errctx
= NULL
;
1165 struct lls_parse_result
*cf_lpr
, *merged_lpr
, *clpr
;
1166 const char *subcmd_name
;
1168 ret
= open(config_file
, O_RDONLY
);
1170 if (errno
!= ENOENT
|| OPT_GIVEN(DSS
, CONFIG_FILE
)) {
1171 ret
= -ERRNO_TO_DSS_ERROR(errno
);
1172 DSS_ERROR_LOG(("config file %s can not be opened\n",
1176 /* no config file -- nothing to do */
1181 ret
= fstat(fd
, &statbuf
);
1183 ret
= -ERRNO_TO_DSS_ERROR(errno
);
1184 DSS_ERROR_LOG(("failed to stat config file %s\n", config_file
));
1187 sz
= statbuf
.st_size
;
1188 if (sz
== 0) { /* config file is empty -- nothing to do */
1192 map
= mmap(NULL
, sz
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
1193 if (map
== MAP_FAILED
) {
1194 ret
= -ERRNO_TO_DSS_ERROR(errno
);
1195 DSS_ERROR_LOG(("failed to mmap config file %s\n",
1199 if (cmd
== CMD_PTR(DSS
))
1202 subcmd_name
= lls_command_name(cmd
);
1203 ret
= lls_convert_config(map
, sz
, subcmd_name
, &cf_argv
, &errctx
);
1206 DSS_ERROR_LOG(("failed to convert config file %s\n",
1208 ret
= lopsub_error(ret
, &errctx
);
1212 ret
= lls_parse(cf_argc
, cf_argv
, cmd
, &cf_lpr
, &errctx
);
1213 lls_free_argv(cf_argv
);
1215 ret
= lopsub_error(ret
, &errctx
);
1218 clpr
= cmd
== CMD_PTR(DSS
)? cmdline_lpr
: cmdline_sublpr
;
1219 if (sighup
) /* config file overrides command line */
1220 ret
= lls_merge(cf_lpr
, clpr
, cmd
, &merged_lpr
, &errctx
);
1221 else /* command line options overrride config file options */
1222 ret
= lls_merge(clpr
, cf_lpr
, cmd
, &merged_lpr
, &errctx
);
1223 lls_free_parse_result(cf_lpr
, cmd
);
1225 ret
= lopsub_error(ret
, &errctx
);
1231 DSS_DEBUG_LOG(("loglevel: %d\n", OPT_UINT32_VAL(DSS
, LOGLEVEL
)));
1232 if (cmd
!= CMD_PTR(DSS
)) {
1234 if (sublpr
!= cmdline_sublpr
)
1235 lls_free_parse_result(sublpr
, cmd
);
1236 sublpr
= merged_lpr
;
1238 sublpr
= cmdline_sublpr
;
1241 if (lpr
!= cmdline_lpr
)
1242 lls_free_parse_result(lpr
, cmd
);
1253 DSS_EMERG_LOG(("%s\n", dss_strerror(-ret
)));
1257 static int handle_sighup(void)
1261 DSS_NOTICE_LOG(("SIGHUP, re-reading config\n"));
1262 dump_dss_config("old");
1263 ret
= parse_config_file(true /* SIGHUP */, CMD_PTR(DSS
));
1266 ret
= parse_config_file(true /* SIGHUP */, CMD_PTR(RUN
));
1269 ret
= check_config();
1274 if (OPT_GIVEN(RUN
, DAEMON
) || daemonized
) {
1275 logfile
= open_log(OPT_STRING_VAL(RUN
, LOGFILE
));
1276 log_welcome(OPT_UINT32_VAL(DSS
, LOGLEVEL
));
1279 dump_dss_config("reloaded");
1280 invalidate_next_snapshot_time();
1284 static void kill_children(void)
1286 restart_create_process();
1287 dss_kill(create_pid
, SIGTERM
, NULL
);
1288 dss_kill(remove_pid
, SIGTERM
, NULL
);
1291 static int handle_signal(void)
1293 int sig
, ret
= next_signal();
1303 ret
= handle_sighup();
1306 ret
= handle_sigchld();
1311 DSS_ERROR_LOG(("%s\n", dss_strerror(-ret
)));
1316 * We can not use rsync locally if the local user is different from the remote
1317 * user or if the src dir is not on the local host (or both).
1319 static int use_rsync_locally(char *logname
)
1321 const char *h
= OPT_STRING_VAL(DSS
, REMOTE_HOST
);
1323 if (strcmp(h
, "localhost") && strcmp(h
, "127.0.0.1"))
1325 if (OPT_GIVEN(DSS
, REMOTE_USER
) &&
1326 strcmp(OPT_STRING_VAL(DSS
, REMOTE_USER
), logname
))
1331 static int rename_resume_snap(int64_t creation_time
)
1333 struct snapshot_list sl
;
1334 struct snapshot
*s
= NULL
;
1335 char *new_name
= incomplete_name(creation_time
);
1339 sl
.num_snapshots
= 0;
1342 dss_get_snapshot_list(&sl
);
1344 * Snapshot recycling: We first look at the newest snapshot. If this
1345 * snapshot happens to be incomplete, the last rsync process was
1346 * aborted and we reuse this one. Otherwise we look at snapshots which
1347 * could be removed (outdated and redundant snapshots) as candidates
1348 * for recycling. If no outdated/redundant snapshot exists, we check if
1349 * there is an orphaned snapshot, which likely is useless anyway.
1351 * Only if no existing snapshot is suitable for recycling, we bite the
1352 * bullet and create a new one.
1354 s
= get_newest_snapshot(&sl
);
1355 if (!s
) /* no snapshots at all */
1357 /* re-use last snapshot if it is incomplete */
1359 if ((s
->flags
& SS_COMPLETE
) == 0)
1362 s
= find_outdated_snapshot(&sl
);
1366 s
= find_redundant_snapshot(&sl
);
1370 s
= find_orphaned_snapshot(&sl
);
1373 DSS_NOTICE_LOG(("recycling %s snapshot %s\n", why
, s
->name
));
1374 ret
= dss_rename(s
->name
, new_name
);
1377 DSS_NOTICE_LOG(("creating %s\n", new_name
));
1379 free_snapshot_list(&sl
);
1383 static void create_rsync_argv(char ***argv
, int64_t *num
)
1387 struct snapshot_list sl
;
1390 dss_get_snapshot_list(&sl
);
1391 assert(!name_of_reference_snapshot
);
1392 name_of_reference_snapshot
= name_of_newest_complete_snapshot(&sl
);
1393 free_snapshot_list(&sl
);
1396 * We specify up to 6 arguments, one argument per given rsync option
1397 * and one argument per given source dir. We also need space for the
1398 * terminating NULL pointer.
1400 N
= OPT_GIVEN(DSS
, RSYNC_OPTION
) + OPT_GIVEN(DSS
, SOURCE_DIR
);
1401 *argv
= dss_malloc((7 + N
) * sizeof(char *));
1402 (*argv
)[i
++] = dss_strdup("rsync");
1403 (*argv
)[i
++] = dss_strdup("-a");
1404 (*argv
)[i
++] = dss_strdup("--delete");
1406 srandom((unsigned)time(NULL
)); /* no need to be fancy here */
1409 if (1000 * (random() / (RAND_MAX
+ 1.0)) < OPT_UINT32_VAL(DSS
, CHECKSUM
)) {
1410 DSS_NOTICE_LOG(("adding --checksum to rsync options\n"));
1411 (*argv
)[i
++] = dss_strdup("--checksum");
1413 for (j
= 0; j
< OPT_GIVEN(DSS
, RSYNC_OPTION
); j
++)
1414 (*argv
)[i
++] = dss_strdup(lls_string_val(j
,
1415 OPT_RESULT(DSS
, RSYNC_OPTION
)));
1416 if (name_of_reference_snapshot
) {
1417 DSS_INFO_LOG(("using %s as reference\n", name_of_reference_snapshot
));
1418 (*argv
)[i
++] = make_message("--link-dest=../%s",
1419 name_of_reference_snapshot
);
1421 DSS_INFO_LOG(("no suitable reference snapshot found\n"));
1422 logname
= dss_logname();
1423 if (use_rsync_locally(logname
)) {
1424 for (j
= 0; j
< OPT_GIVEN(DSS
, SOURCE_DIR
); j
++)
1425 (*argv
)[i
++] = dss_strdup(lls_string_val(j
,
1426 OPT_RESULT(DSS
, SOURCE_DIR
)));
1429 * dss-1.0 and earlier did not support multiple source
1430 * directories. These versions appended a slash to the end of
1431 * the source directory to make sure that only the contents of
1432 * the single source directory, but not the directory itself,
1433 * are copied to the destination. For multiple source
1434 * directories, however, this is not a good idea because the
1435 * source directories may well contain identical file names,
1436 * which would then be copied to the same location on the
1437 * destination, overwriting each other. Moreover, we want the
1438 * directory on the destination match the source. To preserve
1439 * the old behaviour, we thus have to special-case N=1.
1441 for (j
= 0; j
< OPT_GIVEN(DSS
, SOURCE_DIR
); j
++) {
1442 (*argv
)[i
++] = make_message("%s@%s:%s%s",
1443 OPT_GIVEN(DSS
, REMOTE_USER
)?
1444 OPT_STRING_VAL(DSS
, REMOTE_USER
) : logname
,
1445 OPT_STRING_VAL(DSS
, REMOTE_HOST
),
1446 lls_string_val(j
, OPT_RESULT(DSS
, SOURCE_DIR
)),
1452 *num
= get_current_time();
1453 (*argv
)[i
++] = incomplete_name(*num
);
1454 (*argv
)[i
++] = NULL
;
1455 for (j
= 0; j
< i
; j
++)
1456 DSS_DEBUG_LOG(("argv[%d] = %s\n", j
, (*argv
)[j
]));
1459 static void free_rsync_argv(char **argv
)
1465 for (i
= 0; argv
[i
]; i
++)
1470 static int create_snapshot(char **argv
)
1475 ret
= rename_resume_snap(current_snapshot_creation_time
);
1478 dss_exec(&create_pid
, argv
[0], argv
);
1479 snapshot_creation_status
= HS_RUNNING
;
1483 static int select_loop(void)
1486 /* check every 60 seconds for free disk space */
1488 char **rsync_argv
= NULL
;
1492 struct timeval
*tvp
;
1495 tvp
= NULL
; /* sleep until rm hook/process dies */
1496 else { /* sleep one minute */
1502 FD_SET(signal_pipe
, &rfds
);
1503 ret
= dss_select(signal_pipe
+ 1, &rfds
, NULL
, tvp
);
1506 if (FD_ISSET(signal_pipe
, &rfds
)) {
1507 ret
= handle_signal();
1513 if (snapshot_removal_status
== HS_PRE_SUCCESS
) {
1519 if (snapshot_removal_status
== HS_SUCCESS
) {
1523 ret
= try_to_free_disk_space();
1526 if (snapshot_removal_status
!= HS_READY
) {
1527 stop_create_process();
1530 restart_create_process();
1531 switch (snapshot_creation_status
) {
1533 if (!next_snapshot_is_due())
1537 case HS_PRE_RUNNING
:
1539 case HS_POST_RUNNING
:
1541 case HS_PRE_SUCCESS
:
1542 if (!name_of_reference_snapshot
) {
1543 free_rsync_argv(rsync_argv
);
1544 create_rsync_argv(&rsync_argv
, ¤t_snapshot_creation_time
);
1546 ret
= create_snapshot(rsync_argv
);
1550 case HS_NEEDS_RESTART
:
1551 if (!next_snapshot_is_due())
1553 ret
= create_snapshot(rsync_argv
);
1566 static void exit_hook(int exit_code
)
1569 char **argv
, *tmp
= dss_strdup(OPT_STRING_VAL(DSS
, EXIT_HOOK
));
1570 unsigned n
= split_args(tmp
, &argv
);
1573 argv
= dss_realloc(argv
, (n
+ 1) * sizeof(char *));
1574 argv
[n
- 1] = dss_strdup(dss_strerror(-exit_code
));
1576 dss_exec(&pid
, argv
[0], argv
);
1582 static void lock_dss_or_die(void)
1584 char *config_file
= get_config_file_name();
1585 int ret
= lock_dss(config_file
);
1589 DSS_EMERG_LOG(("failed to lock: %s\n", dss_strerror(-ret
)));
1594 static int com_run(void)
1600 if (OPT_GIVEN(DSS
, DRY_RUN
)) {
1601 DSS_ERROR_LOG(("dry run not supported by this command\n"));
1604 config_file
= get_config_file_name();
1605 ret
= get_dss_pid(config_file
, &pid
);
1608 DSS_ERROR_LOG(("pid %d\n", (int)pid
));
1609 return -E_ALREADY_RUNNING
;
1611 if (OPT_GIVEN(RUN
, DAEMON
)) {
1614 logfile
= open_log(OPT_STRING_VAL(RUN
, LOGFILE
));
1617 dump_dss_config("startup");
1618 ret
= install_sighandler(SIGHUP
);
1622 ret
= write(fd
, "\0", 1);
1624 DSS_ERROR_LOG(("write to daemon pipe returned %d\n",
1627 return -ERRNO_TO_DSS_ERROR(errno
);
1631 ret
= select_loop();
1632 if (ret
>= 0) /* impossible */
1636 while (wait(NULL
) >= 0 || errno
!= ECHILD
)
1637 ; /* still have children to wait for */
1640 EXPORT_CMD_HANDLER(run
);
1642 static int com_prune(void)
1645 struct snapshot_list sl
;
1646 struct snapshot
*victim
;
1647 struct disk_space ds
;
1651 ret
= get_disk_space(".", &ds
);
1654 log_disk_space(&ds
);
1655 dss_get_snapshot_list(&sl
);
1657 victim
= find_outdated_snapshot(&sl
);
1661 victim
= find_redundant_snapshot(&sl
);
1667 if (OPT_GIVEN(DSS
, DRY_RUN
)) {
1668 dss_msg("%s snapshot %s (interval = %i)\n",
1669 why
, victim
->name
, victim
->interval
);
1673 pre_remove_hook(victim
, why
);
1674 if (snapshot_removal_status
== HS_PRE_RUNNING
) {
1675 ret
= wait_for_remove_process();
1678 if (snapshot_removal_status
!= HS_PRE_SUCCESS
)
1684 ret
= wait_for_remove_process();
1687 if (snapshot_removal_status
!= HS_SUCCESS
)
1690 if (snapshot_removal_status
!= HS_POST_RUNNING
)
1692 ret
= wait_for_remove_process();
1697 free_snapshot_list(&sl
);
1700 EXPORT_CMD_HANDLER(prune
);
1702 static int com_create(void)
1708 if (OPT_GIVEN(DSS
, DRY_RUN
)) {
1711 create_rsync_argv(&rsync_argv
, ¤t_snapshot_creation_time
);
1712 for (i
= 0; rsync_argv
[i
]; i
++) {
1714 msg
= make_message("%s%s%s", tmp
? tmp
: "",
1715 tmp
? " " : "", rsync_argv
[i
]);
1718 free_rsync_argv(rsync_argv
);
1719 dss_msg("%s\n", msg
);
1725 ret
= wait_for_process(create_pid
, &status
);
1728 ret
= handle_pre_create_hook_exit(status
);
1729 if (ret
<= 0) /* error, or pre-create failed */
1732 create_rsync_argv(&rsync_argv
, ¤t_snapshot_creation_time
);
1733 ret
= create_snapshot(rsync_argv
);
1736 ret
= wait_for_process(create_pid
, &status
);
1739 ret
= handle_rsync_exit(status
);
1744 ret
= wait_for_process(create_pid
, &status
);
1746 free_rsync_argv(rsync_argv
);
1749 EXPORT_CMD_HANDLER(create
);
1751 static int com_ls(void)
1754 struct snapshot_list sl
;
1756 int64_t now
= get_current_time();
1758 dss_get_snapshot_list(&sl
);
1759 FOR_EACH_SNAPSHOT(s
, i
, &sl
) {
1761 if (s
->flags
& SS_COMPLETE
)
1762 d
= (s
->completion_time
- s
->creation_time
) / 60;
1764 d
= (now
- s
->creation_time
) / 60;
1765 dss_msg("%u\t%s\t%3" PRId64
":%02" PRId64
"\n", s
->interval
,
1766 s
->name
, d
/ 60, d
% 60);
1768 free_snapshot_list(&sl
);
1771 EXPORT_CMD_HANDLER(ls
);
1773 static int com_configtest(void)
1775 printf("Syntax Ok\n");
1778 EXPORT_CMD_HANDLER(configtest
);
1780 static int setup_signal_handling(void)
1784 DSS_INFO_LOG(("setting up signal handlers\n"));
1785 signal_pipe
= signal_init(); /* always successful */
1786 ret
= install_sighandler(SIGINT
);
1789 ret
= install_sighandler(SIGTERM
);
1792 return install_sighandler(SIGCHLD
);
1795 static void handle_version_and_help(void)
1799 if (OPT_GIVEN(DSS
, DETAILED_HELP
))
1800 txt
= lls_long_help(CMD_PTR(DSS
));
1801 else if (OPT_GIVEN(DSS
, HELP
))
1802 txt
= lls_short_help(CMD_PTR(DSS
));
1803 else if (OPT_GIVEN(DSS
, VERSION
))
1804 txt
= make_message("%s\n", VERSION_STRING
);
1812 static void show_subcommand_summary(void)
1814 const struct lls_command
*cmd
;
1817 printf("Available subcommands:\n");
1818 for (i
= 1; (cmd
= lls_cmd(i
, dss_suite
)); i
++) {
1819 const char *name
= lls_command_name(cmd
);
1820 const char *purpose
= lls_purpose(cmd
);
1821 printf("%-11s%s\n", name
, purpose
);
1826 int main(int argc
, char **argv
)
1829 char *errctx
= NULL
;
1830 unsigned num_inputs
;
1831 const struct dss_user_data
*ud
;
1833 ret
= lls_parse(argc
, argv
, CMD_PTR(DSS
), &cmdline_lpr
, &errctx
);
1835 ret
= lopsub_error(ret
, &errctx
);
1839 ret
= parse_config_file(false /* no SIGHUP */, CMD_PTR(DSS
));
1842 handle_version_and_help();
1843 num_inputs
= lls_num_inputs(lpr
);
1844 if (num_inputs
== 0)
1845 show_subcommand_summary();
1846 ret
= lls_lookup_subcmd(argv
[argc
- num_inputs
], dss_suite
, &errctx
);
1848 ret
= lopsub_error(ret
, &errctx
);
1851 subcmd
= lls_cmd(ret
, dss_suite
);
1852 ret
= lls_parse(num_inputs
, argv
+ argc
- num_inputs
, subcmd
,
1853 &cmdline_sublpr
, &errctx
);
1855 ret
= lopsub_error(ret
, &errctx
);
1858 sublpr
= cmdline_sublpr
;
1859 ret
= parse_config_file(false /* no SIGHUP */, subcmd
);
1862 ret
= check_config();
1865 ret
= setup_signal_handling();
1868 ud
= lls_user_data(subcmd
);
1869 ret
= ud
->handler();
1874 DSS_ERROR_LOG(("%s\n", errctx
));
1875 DSS_EMERG_LOG(("%s\n", dss_strerror(-ret
)));
1878 lls_free_parse_result(lpr
, CMD_PTR(DSS
));
1879 if (lpr
!= cmdline_lpr
)
1880 lls_free_parse_result(cmdline_lpr
, CMD_PTR(DSS
));
1881 lls_free_parse_result(sublpr
, subcmd
);
1882 if (sublpr
!= cmdline_sublpr
)
1883 lls_free_parse_result(cmdline_sublpr
, subcmd
);
1884 exit(ret
>= 0? EXIT_SUCCESS
: EXIT_FAILURE
);