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663996b3 MS |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
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 | |
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 | |
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 | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <errno.h> | |
23 | ||
24 | #include "unit.h" | |
25 | #include "snapshot.h" | |
26 | #include "unit-name.h" | |
27 | #include "dbus-snapshot.h" | |
f47781d8 | 28 | #include "bus-common-errors.h" |
663996b3 MS |
29 | |
30 | static const UnitActiveState state_translation_table[_SNAPSHOT_STATE_MAX] = { | |
31 | [SNAPSHOT_DEAD] = UNIT_INACTIVE, | |
32 | [SNAPSHOT_ACTIVE] = UNIT_ACTIVE | |
33 | }; | |
34 | ||
35 | static void snapshot_init(Unit *u) { | |
36 | Snapshot *s = SNAPSHOT(u); | |
37 | ||
38 | assert(s); | |
39 | assert(UNIT(s)->load_state == UNIT_STUB); | |
40 | ||
41 | UNIT(s)->ignore_on_isolate = true; | |
42 | UNIT(s)->ignore_on_snapshot = true; | |
14228c0d | 43 | UNIT(s)->allow_isolate = true; |
663996b3 MS |
44 | } |
45 | ||
46 | static void snapshot_set_state(Snapshot *s, SnapshotState state) { | |
47 | SnapshotState old_state; | |
48 | assert(s); | |
49 | ||
50 | old_state = s->state; | |
51 | s->state = state; | |
52 | ||
53 | if (state != old_state) | |
e3bff60a | 54 | log_unit_debug(UNIT(s), "Changed %s -> %s", snapshot_state_to_string(old_state), snapshot_state_to_string(state)); |
663996b3 MS |
55 | |
56 | unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true); | |
57 | } | |
58 | ||
59 | static int snapshot_load(Unit *u) { | |
60 | Snapshot *s = SNAPSHOT(u); | |
61 | ||
62 | assert(u); | |
63 | assert(u->load_state == UNIT_STUB); | |
64 | ||
65 | /* Make sure that only snapshots created via snapshot_create() | |
66 | * can be loaded */ | |
14228c0d | 67 | if (!u->transient && UNIT(s)->manager->n_reloading <= 0) |
663996b3 MS |
68 | return -ENOENT; |
69 | ||
70 | u->load_state = UNIT_LOADED; | |
71 | return 0; | |
72 | } | |
73 | ||
74 | static int snapshot_coldplug(Unit *u) { | |
75 | Snapshot *s = SNAPSHOT(u); | |
76 | ||
77 | assert(s); | |
78 | assert(s->state == SNAPSHOT_DEAD); | |
79 | ||
80 | if (s->deserialized_state != s->state) | |
81 | snapshot_set_state(s, s->deserialized_state); | |
82 | ||
83 | return 0; | |
84 | } | |
85 | ||
86 | static void snapshot_dump(Unit *u, FILE *f, const char *prefix) { | |
87 | Snapshot *s = SNAPSHOT(u); | |
88 | ||
89 | assert(s); | |
90 | assert(f); | |
91 | ||
92 | fprintf(f, | |
93 | "%sSnapshot State: %s\n" | |
94 | "%sClean Up: %s\n", | |
95 | prefix, snapshot_state_to_string(s->state), | |
96 | prefix, yes_no(s->cleanup)); | |
97 | } | |
98 | ||
99 | static int snapshot_start(Unit *u) { | |
100 | Snapshot *s = SNAPSHOT(u); | |
101 | ||
102 | assert(s); | |
103 | assert(s->state == SNAPSHOT_DEAD); | |
104 | ||
105 | snapshot_set_state(s, SNAPSHOT_ACTIVE); | |
106 | ||
107 | if (s->cleanup) | |
108 | unit_add_to_cleanup_queue(u); | |
109 | ||
e735f4d4 | 110 | return 1; |
663996b3 MS |
111 | } |
112 | ||
113 | static int snapshot_stop(Unit *u) { | |
114 | Snapshot *s = SNAPSHOT(u); | |
115 | ||
116 | assert(s); | |
117 | assert(s->state == SNAPSHOT_ACTIVE); | |
118 | ||
119 | snapshot_set_state(s, SNAPSHOT_DEAD); | |
e735f4d4 | 120 | return 1; |
663996b3 MS |
121 | } |
122 | ||
123 | static int snapshot_serialize(Unit *u, FILE *f, FDSet *fds) { | |
124 | Snapshot *s = SNAPSHOT(u); | |
125 | Unit *other; | |
126 | Iterator i; | |
127 | ||
128 | assert(s); | |
129 | assert(f); | |
130 | assert(fds); | |
131 | ||
132 | unit_serialize_item(u, f, "state", snapshot_state_to_string(s->state)); | |
133 | unit_serialize_item(u, f, "cleanup", yes_no(s->cleanup)); | |
134 | SET_FOREACH(other, u->dependencies[UNIT_WANTS], i) | |
135 | unit_serialize_item(u, f, "wants", other->id); | |
136 | ||
137 | return 0; | |
138 | } | |
139 | ||
140 | static int snapshot_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
141 | Snapshot *s = SNAPSHOT(u); | |
142 | int r; | |
143 | ||
144 | assert(u); | |
145 | assert(key); | |
146 | assert(value); | |
147 | assert(fds); | |
148 | ||
149 | if (streq(key, "state")) { | |
150 | SnapshotState state; | |
151 | ||
14228c0d MB |
152 | state = snapshot_state_from_string(value); |
153 | if (state < 0) | |
e3bff60a | 154 | log_unit_debug(u, "Failed to parse state value: %s", value); |
663996b3 MS |
155 | else |
156 | s->deserialized_state = state; | |
157 | ||
158 | } else if (streq(key, "cleanup")) { | |
159 | ||
14228c0d MB |
160 | r = parse_boolean(value); |
161 | if (r < 0) | |
e3bff60a | 162 | log_unit_debug(u, "Failed to parse cleanup value: %s", value); |
663996b3 MS |
163 | else |
164 | s->cleanup = r; | |
165 | ||
166 | } else if (streq(key, "wants")) { | |
167 | ||
14228c0d MB |
168 | r = unit_add_two_dependencies_by_name(u, UNIT_AFTER, UNIT_WANTS, value, NULL, true); |
169 | if (r < 0) | |
663996b3 MS |
170 | return r; |
171 | } else | |
e3bff60a | 172 | log_unit_debug(u, "Unknown serialization key: %s", key); |
663996b3 MS |
173 | |
174 | return 0; | |
175 | } | |
176 | ||
177 | _pure_ static UnitActiveState snapshot_active_state(Unit *u) { | |
178 | assert(u); | |
179 | ||
180 | return state_translation_table[SNAPSHOT(u)->state]; | |
181 | } | |
182 | ||
183 | _pure_ static const char *snapshot_sub_state_to_string(Unit *u) { | |
184 | assert(u); | |
185 | ||
186 | return snapshot_state_to_string(SNAPSHOT(u)->state); | |
187 | } | |
188 | ||
60f067b4 | 189 | int snapshot_create(Manager *m, const char *name, bool cleanup, sd_bus_error *e, Snapshot **_s) { |
14228c0d | 190 | _cleanup_free_ char *n = NULL; |
663996b3 | 191 | Unit *other, *u = NULL; |
14228c0d | 192 | Iterator i; |
663996b3 MS |
193 | int r; |
194 | const char *k; | |
195 | ||
196 | assert(m); | |
197 | assert(_s); | |
198 | ||
199 | if (name) { | |
e3bff60a | 200 | if (!unit_name_is_valid(name, UNIT_NAME_PLAIN)) |
60f067b4 | 201 | return sd_bus_error_setf(e, SD_BUS_ERROR_INVALID_ARGS, "Unit name %s is not valid.", name); |
663996b3 | 202 | |
e3bff60a | 203 | if (!endswith(name, ".snapshot")) |
60f067b4 | 204 | return sd_bus_error_setf(e, SD_BUS_ERROR_INVALID_ARGS, "Unit name %s lacks snapshot suffix.", name); |
663996b3 | 205 | |
60f067b4 | 206 | if (manager_get_unit(m, name)) |
f47781d8 | 207 | return sd_bus_error_setf(e, BUS_ERROR_UNIT_EXISTS, "Snapshot %s exists already.", name); |
663996b3 MS |
208 | |
209 | } else { | |
210 | ||
211 | for (;;) { | |
212 | if (asprintf(&n, "snapshot-%u.snapshot", ++ m->n_snapshots) < 0) | |
213 | return -ENOMEM; | |
214 | ||
14228c0d MB |
215 | if (!manager_get_unit(m, n)) { |
216 | name = n; | |
663996b3 | 217 | break; |
14228c0d | 218 | } |
663996b3 MS |
219 | |
220 | free(n); | |
14228c0d | 221 | n = NULL; |
663996b3 | 222 | } |
663996b3 MS |
223 | } |
224 | ||
225 | r = manager_load_unit_prepare(m, name, NULL, e, &u); | |
663996b3 MS |
226 | if (r < 0) |
227 | goto fail; | |
228 | ||
14228c0d | 229 | u->transient = true; |
663996b3 MS |
230 | manager_dispatch_load_queue(m); |
231 | assert(u->load_state == UNIT_LOADED); | |
232 | ||
233 | HASHMAP_FOREACH_KEY(other, k, m->units, i) { | |
234 | ||
14228c0d MB |
235 | if (other->ignore_on_snapshot || |
236 | other->transient) | |
663996b3 MS |
237 | continue; |
238 | ||
239 | if (k != other->id) | |
240 | continue; | |
241 | ||
242 | if (UNIT_VTABLE(other)->check_snapshot) | |
243 | if (!UNIT_VTABLE(other)->check_snapshot(other)) | |
244 | continue; | |
245 | ||
246 | if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other))) | |
247 | continue; | |
248 | ||
14228c0d MB |
249 | r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_WANTS, other, true); |
250 | if (r < 0) | |
663996b3 MS |
251 | goto fail; |
252 | } | |
253 | ||
254 | SNAPSHOT(u)->cleanup = cleanup; | |
663996b3 MS |
255 | *_s = SNAPSHOT(u); |
256 | ||
e3bff60a | 257 | log_unit_info(u, "Created snapshot."); |
e842803a | 258 | |
663996b3 MS |
259 | return 0; |
260 | ||
261 | fail: | |
262 | if (u) | |
263 | unit_add_to_cleanup_queue(u); | |
264 | ||
265 | return r; | |
266 | } | |
267 | ||
268 | void snapshot_remove(Snapshot *s) { | |
269 | assert(s); | |
270 | ||
e3bff60a | 271 | log_unit_info(UNIT(s), "Removing snapshot."); |
e842803a | 272 | |
663996b3 MS |
273 | unit_add_to_cleanup_queue(UNIT(s)); |
274 | } | |
275 | ||
276 | static const char* const snapshot_state_table[_SNAPSHOT_STATE_MAX] = { | |
277 | [SNAPSHOT_DEAD] = "dead", | |
278 | [SNAPSHOT_ACTIVE] = "active" | |
279 | }; | |
280 | ||
281 | DEFINE_STRING_TABLE_LOOKUP(snapshot_state, SnapshotState); | |
282 | ||
283 | const UnitVTable snapshot_vtable = { | |
284 | .object_size = sizeof(Snapshot), | |
285 | ||
286 | .no_alias = true, | |
287 | .no_instances = true, | |
288 | .no_gc = true, | |
289 | ||
290 | .init = snapshot_init, | |
663996b3 | 291 | .load = snapshot_load, |
60f067b4 | 292 | |
663996b3 MS |
293 | .coldplug = snapshot_coldplug, |
294 | ||
295 | .dump = snapshot_dump, | |
296 | ||
297 | .start = snapshot_start, | |
298 | .stop = snapshot_stop, | |
299 | ||
300 | .serialize = snapshot_serialize, | |
301 | .deserialize_item = snapshot_deserialize_item, | |
302 | ||
303 | .active_state = snapshot_active_state, | |
304 | .sub_state_to_string = snapshot_sub_state_to_string, | |
305 | ||
306 | .bus_interface = "org.freedesktop.systemd1.Snapshot", | |
60f067b4 | 307 | .bus_vtable = bus_snapshot_vtable |
663996b3 | 308 | }; |