1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
22 #include <sys/inotify.h>
23 #include <sys/epoll.h>
24 #include <sys/ioctl.h>
29 #include "unit-name.h"
31 #include "dbus-path.h"
33 #include "bus-errors.h"
35 static const UnitActiveState state_translation_table
[_PATH_STATE_MAX
] = {
36 [PATH_DEAD
] = UNIT_INACTIVE
,
37 [PATH_WAITING
] = UNIT_ACTIVE
,
38 [PATH_RUNNING
] = UNIT_ACTIVE
,
39 [PATH_MAINTENANCE
] = UNIT_MAINTENANCE
42 static void path_done(Unit
*u
) {
48 while ((s
= p
->specs
)) {
49 LIST_REMOVE(PathSpec
, spec
, p
->specs
, s
);
54 int path_add_one_mount_link(Path
*p
, Mount
*m
) {
61 if (p
->meta
.load_state
!= UNIT_LOADED
||
62 m
->meta
.load_state
!= UNIT_LOADED
)
65 LIST_FOREACH(spec
, s
, p
->specs
) {
67 if (!path_startswith(s
->path
, m
->where
))
70 if ((r
= unit_add_two_dependencies(UNIT(p
), UNIT_AFTER
, UNIT_REQUIRES
, UNIT(m
), true)) < 0)
77 static int path_add_mount_links(Path
*p
) {
83 LIST_FOREACH(units_per_type
, other
, p
->meta
.manager
->units_per_type
[UNIT_MOUNT
])
84 if ((r
= path_add_one_mount_link(p
, (Mount
*) other
)) < 0)
90 static int path_verify(Path
*p
) {
93 if (p
->meta
.load_state
!= UNIT_LOADED
)
97 log_error("%s lacks path setting. Refusing.", p
->meta
.id
);
104 static int path_add_default_dependencies(Path
*p
) {
109 if (p
->meta
.manager
->running_as
== MANAGER_SYSTEM
)
110 if ((r
= unit_add_two_dependencies_by_name(UNIT(p
), UNIT_AFTER
, UNIT_REQUIRES
, SPECIAL_SYSINIT_TARGET
, NULL
, true)) < 0)
113 return unit_add_two_dependencies_by_name(UNIT(p
), UNIT_BEFORE
, UNIT_CONFLICTED_BY
, SPECIAL_SHUTDOWN_TARGET
, NULL
, true);
116 static int path_load(Unit
*u
) {
121 assert(u
->meta
.load_state
== UNIT_STUB
);
123 if ((r
= unit_load_fragment_and_dropin(u
)) < 0)
126 if (u
->meta
.load_state
== UNIT_LOADED
) {
129 if ((r
= unit_load_related_unit(u
, ".service", &p
->unit
)))
132 if ((r
= unit_add_dependency(u
, UNIT_BEFORE
, p
->unit
, true)) < 0)
135 if ((r
= path_add_mount_links(p
)) < 0)
138 if (p
->meta
.default_dependencies
)
139 if ((r
= path_add_default_dependencies(p
)) < 0)
143 return path_verify(p
);
146 static void path_dump(Unit
*u
, FILE *f
, const char *prefix
) {
156 prefix
, path_state_to_string(p
->state
),
157 prefix
, p
->unit
->meta
.id
);
159 LIST_FOREACH(spec
, s
, p
->specs
)
163 path_type_to_string(s
->type
),
167 static void path_unwatch_one(Path
*p
, PathSpec
*s
) {
169 if (s
->inotify_fd
< 0)
172 unit_unwatch_fd(UNIT(p
), &s
->watch
);
174 close_nointr_nofail(s
->inotify_fd
);
178 static int path_watch_one(Path
*p
, PathSpec
*s
) {
179 static const int flags_table
[_PATH_TYPE_MAX
] = {
180 [PATH_EXISTS
] = IN_DELETE_SELF
|IN_MOVE_SELF
,
181 [PATH_CHANGED
] = IN_DELETE_SELF
|IN_MOVE_SELF
|IN_ATTRIB
|IN_CLOSE_WRITE
|IN_CREATE
|IN_DELETE
|IN_MOVED_FROM
|IN_MOVED_TO
,
182 [PATH_DIRECTORY_NOT_EMPTY
] = IN_DELETE_SELF
|IN_MOVE_SELF
|IN_CREATE
|IN_MOVED_TO
192 path_unwatch_one(p
, s
);
194 if (!(k
= strdup(s
->path
)))
197 if ((s
->inotify_fd
= inotify_init1(IN_NONBLOCK
|IN_CLOEXEC
)) < 0) {
202 if (unit_watch_fd(UNIT(p
), s
->inotify_fd
, EPOLLIN
, &s
->watch
) < 0) {
207 if ((s
->primary_wd
= inotify_add_watch(s
->inotify_fd
, k
, flags_table
[s
->type
])) >= 0)
214 /* This assumes the path was passed through path_kill_slashes()! */
215 if (!(slash
= strrchr(k
, '/')))
220 flags
= IN_DELETE_SELF
|IN_MOVE_SELF
;
222 flags
|= IN_CREATE
| IN_MOVED_TO
| IN_ATTRIB
;
224 if (inotify_add_watch(s
->inotify_fd
, k
, flags
) >= 0)
233 path_unwatch_one(p
, s
);
237 static void path_unwatch(Path
*p
) {
242 LIST_FOREACH(spec
, s
, p
->specs
)
243 path_unwatch_one(p
, s
);
246 static int path_watch(Path
*p
) {
252 LIST_FOREACH(spec
, s
, p
->specs
)
253 if ((r
= path_watch_one(p
, s
)) < 0)
259 static void path_set_state(Path
*p
, PathState state
) {
263 old_state
= p
->state
;
266 if (state
!= PATH_WAITING
)
269 if (state
!= old_state
)
270 log_debug("%s changed %s -> %s",
272 path_state_to_string(old_state
),
273 path_state_to_string(state
));
275 unit_notify(UNIT(p
), state_translation_table
[old_state
], state_translation_table
[state
]);
278 static void path_enter_waiting(Path
*p
, bool initial
);
280 static int path_coldplug(Unit
*u
) {
284 assert(p
->state
== PATH_DEAD
);
286 if (p
->deserialized_state
!= p
->state
) {
288 if (p
->deserialized_state
== PATH_WAITING
||
289 p
->deserialized_state
== PATH_RUNNING
)
290 path_enter_waiting(p
, true);
292 path_set_state(p
, p
->deserialized_state
);
298 static void path_enter_dead(Path
*p
, bool success
) {
304 path_set_state(p
, p
->failure
? PATH_MAINTENANCE
: PATH_DEAD
);
307 static void path_enter_running(Path
*p
) {
312 dbus_error_init(&error
);
314 /* Don't start job if we are supposed to go down */
315 if (p
->meta
.job
&& p
->meta
.job
->type
== JOB_STOP
)
318 if ((r
= manager_add_job(p
->meta
.manager
, JOB_START
, p
->unit
, JOB_REPLACE
, true, &error
, NULL
)) < 0)
321 path_set_state(p
, PATH_RUNNING
);
325 log_warning("%s failed to queue unit startup job: %s", p
->meta
.id
, bus_error(&error
, r
));
326 path_enter_dead(p
, false);
328 dbus_error_free(&error
);
332 static void path_enter_waiting(Path
*p
, bool initial
) {
337 LIST_FOREACH(spec
, s
, p
->specs
) {
342 good
= access(s
->path
, F_OK
) >= 0;
345 case PATH_DIRECTORY_NOT_EMPTY
:
346 good
= dir_is_empty(s
->path
) == 0;
352 b
= access(s
->path
, F_OK
) >= 0;
353 good
= !initial
&& b
!= s
->previous_exists
;
354 s
->previous_exists
= b
;
367 path_enter_running(p
);
371 if ((r
= path_watch(p
)) < 0)
374 path_set_state(p
, PATH_WAITING
);
378 log_warning("%s failed to enter waiting state: %s", p
->meta
.id
, strerror(-r
));
379 path_enter_dead(p
, false);
382 static int path_start(Unit
*u
) {
386 assert(p
->state
== PATH_DEAD
|| p
->state
== PATH_MAINTENANCE
);
388 if (p
->unit
->meta
.load_state
!= UNIT_LOADED
)
392 path_enter_waiting(p
, true);
396 static int path_stop(Unit
*u
) {
400 assert(p
->state
== PATH_WAITING
|| p
->state
== PATH_RUNNING
);
402 path_enter_dead(p
, true);
406 static int path_serialize(Unit
*u
, FILE *f
, FDSet
*fds
) {
413 unit_serialize_item(u
, f
, "state", path_state_to_string(p
->state
));
418 static int path_deserialize_item(Unit
*u
, const char *key
, const char *value
, FDSet
*fds
) {
426 if (streq(key
, "state")) {
429 if ((state
= path_state_from_string(value
)) < 0)
430 log_debug("Failed to parse state value %s", value
);
432 p
->deserialized_state
= state
;
434 log_debug("Unknown serialization key '%s'", key
);
439 static UnitActiveState
path_active_state(Unit
*u
) {
442 return state_translation_table
[PATH(u
)->state
];
445 static const char *path_sub_state_to_string(Unit
*u
) {
448 return path_state_to_string(PATH(u
)->state
);
451 static void path_fd_event(Unit
*u
, int fd
, uint32_t events
, Watch
*w
) {
455 struct inotify_event
*buf
= NULL
;
461 if (p
->state
!= PATH_WAITING
)
464 log_debug("inotify wakeup on %s.", u
->meta
.id
);
466 if (events
!= EPOLLIN
) {
467 log_error("Got Invalid poll event on inotify.");
471 LIST_FOREACH(spec
, s
, p
->specs
)
472 if (s
->inotify_fd
== fd
)
476 log_error("Got event on unknown fd.");
480 if (ioctl(fd
, FIONREAD
, &l
) < 0) {
481 log_error("FIONREAD failed: %s", strerror(errno
));
485 if (!(buf
= malloc(l
))) {
486 log_error("Failed to allocate buffer: %s", strerror(-ENOMEM
));
490 if ((k
= read(fd
, buf
, l
)) < 0) {
491 log_error("Failed to read inotify event: %s", strerror(-errno
));
495 if ((size_t) k
< sizeof(struct inotify_event
) ||
496 (size_t) k
< sizeof(struct inotify_event
) + buf
->len
) {
497 log_error("inotify event too small.");
501 if (s
->type
== PATH_CHANGED
&& s
->primary_wd
== buf
->wd
)
502 path_enter_running(p
);
504 path_enter_waiting(p
, false);
512 path_enter_dead(p
, false);
515 void path_unit_notify(Unit
*u
, UnitActiveState new_state
) {
520 if (u
->meta
.type
== UNIT_PATH
)
523 SET_FOREACH(n
, u
->meta
.names
, i
) {
528 if (!(k
= unit_name_change_suffix(n
, ".path"))) {
533 t
= manager_get_unit(u
->meta
.manager
, k
);
539 if (t
->meta
.load_state
!= UNIT_LOADED
)
547 if (p
->state
== PATH_RUNNING
&& new_state
== UNIT_INACTIVE
) {
548 log_debug("%s got notified about unit deactivation.", p
->meta
.id
);
549 path_enter_waiting(p
, false);
556 log_error("Failed find path unit: %s", strerror(-r
));
559 static void path_reset_maintenance(Unit
*u
) {
564 if (p
->state
== PATH_MAINTENANCE
)
565 path_set_state(p
, PATH_DEAD
);
570 static const char* const path_state_table
[_PATH_STATE_MAX
] = {
571 [PATH_DEAD
] = "dead",
572 [PATH_WAITING
] = "waiting",
573 [PATH_RUNNING
] = "running",
574 [PATH_MAINTENANCE
] = "maintenance"
577 DEFINE_STRING_TABLE_LOOKUP(path_state
, PathState
);
579 static const char* const path_type_table
[_PATH_TYPE_MAX
] = {
580 [PATH_EXISTS
] = "PathExists",
581 [PATH_CHANGED
] = "PathChanged",
582 [PATH_DIRECTORY_NOT_EMPTY
] = "DirectoryNotEmpty"
585 DEFINE_STRING_TABLE_LOOKUP(path_type
, PathType
);
587 const UnitVTable path_vtable
= {
593 .coldplug
= path_coldplug
,
600 .serialize
= path_serialize
,
601 .deserialize_item
= path_deserialize_item
,
603 .active_state
= path_active_state
,
604 .sub_state_to_string
= path_sub_state_to_string
,
606 .fd_event
= path_fd_event
,
608 .reset_maintenance
= path_reset_maintenance
,
610 .bus_message_handler
= bus_path_message_handler