]>
Commit | Line | Data |
---|---|---|
d6c9574f | 1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
5cb5a6ff | 2 | |
a7334b09 LP |
3 | /*** |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
9 | under the terms of the GNU Lesser General Public License as published by |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
a7334b09 LP |
11 | (at your option) any later version. |
12 | ||
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 | |
5430f7f2 | 16 | Lesser General Public License for more details. |
a7334b09 | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
a7334b09 LP |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
41447faf LP |
22 | #include <errno.h> |
23 | ||
87f0e418 | 24 | #include "unit.h" |
5cb5a6ff | 25 | #include "snapshot.h" |
41447faf LP |
26 | #include "unit-name.h" |
27 | #include "dbus-snapshot.h" | |
96aad8d1 | 28 | #include "bus-common-errors.h" |
41447faf LP |
29 | |
30 | static const UnitActiveState state_translation_table[_SNAPSHOT_STATE_MAX] = { | |
31 | [SNAPSHOT_DEAD] = UNIT_INACTIVE, | |
32 | [SNAPSHOT_ACTIVE] = UNIT_ACTIVE | |
33 | }; | |
34 | ||
7a6000a6 LP |
35 | static void snapshot_init(Unit *u) { |
36 | Snapshot *s = SNAPSHOT(u); | |
37 | ||
38 | assert(s); | |
1124fe6f | 39 | assert(UNIT(s)->load_state == UNIT_STUB); |
7a6000a6 | 40 | |
1124fe6f MS |
41 | UNIT(s)->ignore_on_isolate = true; |
42 | UNIT(s)->ignore_on_snapshot = true; | |
a190eeb8 | 43 | UNIT(s)->allow_isolate = true; |
7a6000a6 LP |
44 | } |
45 | ||
a16e1123 LP |
46 | static void snapshot_set_state(Snapshot *s, SnapshotState state) { |
47 | SnapshotState old_state; | |
48 | assert(s); | |
41447faf | 49 | |
a16e1123 LP |
50 | old_state = s->state; |
51 | s->state = state; | |
41447faf | 52 | |
a16e1123 | 53 | if (state != old_state) |
79008bdd | 54 | log_unit_debug(UNIT(s)->id, |
6f8bd5c9 ZJS |
55 | "%s changed %s -> %s", |
56 | UNIT(s)->id, | |
57 | snapshot_state_to_string(old_state), | |
58 | snapshot_state_to_string(state)); | |
5cb5a6ff | 59 | |
e2f3b44c | 60 | unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true); |
a16e1123 | 61 | } |
41447faf | 62 | |
6ec1117a LP |
63 | static int snapshot_load(Unit *u) { |
64 | Snapshot *s = SNAPSHOT(u); | |
65 | ||
66 | assert(u); | |
ac155bb8 | 67 | assert(u->load_state == UNIT_STUB); |
6ec1117a LP |
68 | |
69 | /* Make sure that only snapshots created via snapshot_create() | |
70 | * can be loaded */ | |
a190eeb8 | 71 | if (!u->transient && UNIT(s)->manager->n_reloading <= 0) |
6ec1117a LP |
72 | return -ENOENT; |
73 | ||
ac155bb8 | 74 | u->load_state = UNIT_LOADED; |
6ec1117a LP |
75 | return 0; |
76 | } | |
77 | ||
6e392c9c | 78 | static int snapshot_coldplug(Unit *u, Hashmap *deferred_work) { |
a16e1123 | 79 | Snapshot *s = SNAPSHOT(u); |
41447faf | 80 | |
a16e1123 LP |
81 | assert(s); |
82 | assert(s->state == SNAPSHOT_DEAD); | |
41447faf | 83 | |
a16e1123 LP |
84 | if (s->deserialized_state != s->state) |
85 | snapshot_set_state(s, s->deserialized_state); | |
41447faf LP |
86 | |
87 | return 0; | |
88 | } | |
89 | ||
90 | static void snapshot_dump(Unit *u, FILE *f, const char *prefix) { | |
87f0e418 | 91 | Snapshot *s = SNAPSHOT(u); |
5cb5a6ff LP |
92 | |
93 | assert(s); | |
41447faf | 94 | assert(f); |
5cb5a6ff | 95 | |
41447faf LP |
96 | fprintf(f, |
97 | "%sSnapshot State: %s\n" | |
98 | "%sClean Up: %s\n", | |
a16e1123 | 99 | prefix, snapshot_state_to_string(s->state), |
41447faf LP |
100 | prefix, yes_no(s->cleanup)); |
101 | } | |
102 | ||
41447faf LP |
103 | static int snapshot_start(Unit *u) { |
104 | Snapshot *s = SNAPSHOT(u); | |
105 | ||
106 | assert(s); | |
107 | assert(s->state == SNAPSHOT_DEAD); | |
108 | ||
109 | snapshot_set_state(s, SNAPSHOT_ACTIVE); | |
110 | ||
111 | if (s->cleanup) | |
112 | unit_add_to_cleanup_queue(u); | |
113 | ||
82a2b6bb | 114 | return 1; |
41447faf LP |
115 | } |
116 | ||
117 | static int snapshot_stop(Unit *u) { | |
118 | Snapshot *s = SNAPSHOT(u); | |
119 | ||
120 | assert(s); | |
121 | assert(s->state == SNAPSHOT_ACTIVE); | |
122 | ||
123 | snapshot_set_state(s, SNAPSHOT_DEAD); | |
82a2b6bb | 124 | return 1; |
5cb5a6ff LP |
125 | } |
126 | ||
a16e1123 LP |
127 | static int snapshot_serialize(Unit *u, FILE *f, FDSet *fds) { |
128 | Snapshot *s = SNAPSHOT(u); | |
129 | Unit *other; | |
130 | Iterator i; | |
131 | ||
132 | assert(s); | |
133 | assert(f); | |
134 | assert(fds); | |
135 | ||
136 | unit_serialize_item(u, f, "state", snapshot_state_to_string(s->state)); | |
137 | unit_serialize_item(u, f, "cleanup", yes_no(s->cleanup)); | |
ac155bb8 MS |
138 | SET_FOREACH(other, u->dependencies[UNIT_WANTS], i) |
139 | unit_serialize_item(u, f, "wants", other->id); | |
a16e1123 LP |
140 | |
141 | return 0; | |
142 | } | |
143 | ||
144 | static int snapshot_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
145 | Snapshot *s = SNAPSHOT(u); | |
146 | int r; | |
147 | ||
148 | assert(u); | |
149 | assert(key); | |
150 | assert(value); | |
151 | assert(fds); | |
152 | ||
153 | if (streq(key, "state")) { | |
154 | SnapshotState state; | |
155 | ||
a190eeb8 LP |
156 | state = snapshot_state_from_string(value); |
157 | if (state < 0) | |
79008bdd | 158 | log_unit_debug(u->id, "Failed to parse state value %s", value); |
a16e1123 LP |
159 | else |
160 | s->deserialized_state = state; | |
161 | ||
162 | } else if (streq(key, "cleanup")) { | |
163 | ||
a190eeb8 LP |
164 | r = parse_boolean(value); |
165 | if (r < 0) | |
79008bdd | 166 | log_unit_debug(u->id, "Failed to parse cleanup value %s", value); |
a16e1123 LP |
167 | else |
168 | s->cleanup = r; | |
169 | ||
daf32cc7 | 170 | } else if (streq(key, "wants")) { |
a16e1123 | 171 | |
a190eeb8 LP |
172 | r = unit_add_two_dependencies_by_name(u, UNIT_AFTER, UNIT_WANTS, value, NULL, true); |
173 | if (r < 0) | |
a16e1123 LP |
174 | return r; |
175 | } else | |
79008bdd | 176 | log_unit_debug(u->id, "Unknown serialization key '%s'", key); |
a16e1123 LP |
177 | |
178 | return 0; | |
179 | } | |
180 | ||
44a6b1b6 | 181 | _pure_ static UnitActiveState snapshot_active_state(Unit *u) { |
41447faf LP |
182 | assert(u); |
183 | ||
184 | return state_translation_table[SNAPSHOT(u)->state]; | |
185 | } | |
186 | ||
44a6b1b6 | 187 | _pure_ static const char *snapshot_sub_state_to_string(Unit *u) { |
41447faf LP |
188 | assert(u); |
189 | ||
a16e1123 | 190 | return snapshot_state_to_string(SNAPSHOT(u)->state); |
41447faf LP |
191 | } |
192 | ||
718db961 | 193 | int snapshot_create(Manager *m, const char *name, bool cleanup, sd_bus_error *e, Snapshot **_s) { |
a190eeb8 | 194 | _cleanup_free_ char *n = NULL; |
a16e1123 | 195 | Unit *other, *u = NULL; |
a190eeb8 | 196 | Iterator i; |
41447faf | 197 | int r; |
a16e1123 | 198 | const char *k; |
41447faf LP |
199 | |
200 | assert(m); | |
201 | assert(_s); | |
202 | ||
203 | if (name) { | |
f78e6385 | 204 | if (!unit_name_is_valid(name, TEMPLATE_INVALID)) |
718db961 | 205 | return sd_bus_error_setf(e, SD_BUS_ERROR_INVALID_ARGS, "Unit name %s is not valid.", name); |
41447faf | 206 | |
718db961 LP |
207 | if (unit_name_to_type(name) != UNIT_SNAPSHOT) |
208 | return sd_bus_error_setf(e, SD_BUS_ERROR_INVALID_ARGS, "Unit name %s lacks snapshot suffix.", name); | |
41447faf | 209 | |
718db961 | 210 | if (manager_get_unit(m, name)) |
7cabba07 | 211 | return sd_bus_error_setf(e, BUS_ERROR_UNIT_EXISTS, "Snapshot %s exists already.", name); |
41447faf LP |
212 | |
213 | } else { | |
214 | ||
215 | for (;;) { | |
216 | if (asprintf(&n, "snapshot-%u.snapshot", ++ m->n_snapshots) < 0) | |
217 | return -ENOMEM; | |
218 | ||
ebec5783 ZJS |
219 | if (!manager_get_unit(m, n)) { |
220 | name = n; | |
41447faf | 221 | break; |
ebec5783 | 222 | } |
41447faf LP |
223 | |
224 | free(n); | |
a190eeb8 | 225 | n = NULL; |
41447faf | 226 | } |
41447faf LP |
227 | } |
228 | ||
398ef8ba | 229 | r = manager_load_unit_prepare(m, name, NULL, e, &u); |
41447faf | 230 | if (r < 0) |
a16e1123 LP |
231 | goto fail; |
232 | ||
a190eeb8 | 233 | u->transient = true; |
6ec1117a | 234 | manager_dispatch_load_queue(m); |
ac155bb8 | 235 | assert(u->load_state == UNIT_LOADED); |
6ec1117a | 236 | |
a16e1123 LP |
237 | HASHMAP_FOREACH_KEY(other, k, m->units, i) { |
238 | ||
a190eeb8 LP |
239 | if (other->ignore_on_snapshot || |
240 | other->transient) | |
a16e1123 LP |
241 | continue; |
242 | ||
ac155bb8 | 243 | if (k != other->id) |
a16e1123 LP |
244 | continue; |
245 | ||
701cc384 LP |
246 | if (UNIT_VTABLE(other)->check_snapshot) |
247 | if (!UNIT_VTABLE(other)->check_snapshot(other)) | |
248 | continue; | |
249 | ||
a16e1123 LP |
250 | if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other))) |
251 | continue; | |
252 | ||
a190eeb8 LP |
253 | r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_WANTS, other, true); |
254 | if (r < 0) | |
a16e1123 LP |
255 | goto fail; |
256 | } | |
41447faf LP |
257 | |
258 | SNAPSHOT(u)->cleanup = cleanup; | |
259 | *_s = SNAPSHOT(u); | |
260 | ||
79008bdd | 261 | log_unit_info(u->id, "Created snapshot %s.", u->id); |
6f8bd5c9 | 262 | |
41447faf | 263 | return 0; |
a16e1123 LP |
264 | |
265 | fail: | |
266 | if (u) | |
267 | unit_add_to_cleanup_queue(u); | |
268 | ||
269 | return r; | |
41447faf LP |
270 | } |
271 | ||
272 | void snapshot_remove(Snapshot *s) { | |
273 | assert(s); | |
274 | ||
79008bdd | 275 | log_unit_info(UNIT(s)->id, "Removing snapshot %s.", UNIT(s)->id); |
6f8bd5c9 | 276 | |
41447faf | 277 | unit_add_to_cleanup_queue(UNIT(s)); |
034c6ed7 LP |
278 | } |
279 | ||
a16e1123 LP |
280 | static const char* const snapshot_state_table[_SNAPSHOT_STATE_MAX] = { |
281 | [SNAPSHOT_DEAD] = "dead", | |
282 | [SNAPSHOT_ACTIVE] = "active" | |
283 | }; | |
284 | ||
285 | DEFINE_STRING_TABLE_LOOKUP(snapshot_state, SnapshotState); | |
286 | ||
87f0e418 | 287 | const UnitVTable snapshot_vtable = { |
7d17cfbc | 288 | .object_size = sizeof(Snapshot), |
5cb5a6ff | 289 | |
41447faf LP |
290 | .no_alias = true, |
291 | .no_instances = true, | |
701cc384 | 292 | .no_gc = true, |
41447faf | 293 | |
7a6000a6 | 294 | .init = snapshot_init, |
6ec1117a | 295 | .load = snapshot_load, |
718db961 | 296 | |
a16e1123 | 297 | .coldplug = snapshot_coldplug, |
41447faf LP |
298 | |
299 | .dump = snapshot_dump, | |
300 | ||
301 | .start = snapshot_start, | |
302 | .stop = snapshot_stop, | |
303 | ||
a16e1123 LP |
304 | .serialize = snapshot_serialize, |
305 | .deserialize_item = snapshot_deserialize_item, | |
306 | ||
41447faf LP |
307 | .active_state = snapshot_active_state, |
308 | .sub_state_to_string = snapshot_sub_state_to_string, | |
5cb5a6ff | 309 | |
c4e2ceae | 310 | .bus_interface = "org.freedesktop.systemd1.Snapshot", |
718db961 | 311 | .bus_vtable = bus_snapshot_vtable |
5cb5a6ff | 312 | }; |