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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" | |
398ef8ba | 28 | #include "bus-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) |
40d50879 | 54 | log_debug("%s changed %s -> %s", |
1124fe6f | 55 | UNIT(s)->id, |
a16e1123 LP |
56 | snapshot_state_to_string(old_state), |
57 | snapshot_state_to_string(state)); | |
5cb5a6ff | 58 | |
e2f3b44c | 59 | unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true); |
a16e1123 | 60 | } |
41447faf | 61 | |
6ec1117a LP |
62 | static int snapshot_load(Unit *u) { |
63 | Snapshot *s = SNAPSHOT(u); | |
64 | ||
65 | assert(u); | |
ac155bb8 | 66 | assert(u->load_state == UNIT_STUB); |
6ec1117a LP |
67 | |
68 | /* Make sure that only snapshots created via snapshot_create() | |
69 | * can be loaded */ | |
a190eeb8 | 70 | if (!u->transient && UNIT(s)->manager->n_reloading <= 0) |
6ec1117a LP |
71 | return -ENOENT; |
72 | ||
ac155bb8 | 73 | u->load_state = UNIT_LOADED; |
6ec1117a LP |
74 | return 0; |
75 | } | |
76 | ||
a16e1123 LP |
77 | static int snapshot_coldplug(Unit *u) { |
78 | Snapshot *s = SNAPSHOT(u); | |
41447faf | 79 | |
a16e1123 LP |
80 | assert(s); |
81 | assert(s->state == SNAPSHOT_DEAD); | |
41447faf | 82 | |
a16e1123 LP |
83 | if (s->deserialized_state != s->state) |
84 | snapshot_set_state(s, s->deserialized_state); | |
41447faf LP |
85 | |
86 | return 0; | |
87 | } | |
88 | ||
89 | static void snapshot_dump(Unit *u, FILE *f, const char *prefix) { | |
87f0e418 | 90 | Snapshot *s = SNAPSHOT(u); |
5cb5a6ff LP |
91 | |
92 | assert(s); | |
41447faf | 93 | assert(f); |
5cb5a6ff | 94 | |
41447faf LP |
95 | fprintf(f, |
96 | "%sSnapshot State: %s\n" | |
97 | "%sClean Up: %s\n", | |
a16e1123 | 98 | prefix, snapshot_state_to_string(s->state), |
41447faf LP |
99 | prefix, yes_no(s->cleanup)); |
100 | } | |
101 | ||
41447faf LP |
102 | static int snapshot_start(Unit *u) { |
103 | Snapshot *s = SNAPSHOT(u); | |
104 | ||
105 | assert(s); | |
106 | assert(s->state == SNAPSHOT_DEAD); | |
107 | ||
108 | snapshot_set_state(s, SNAPSHOT_ACTIVE); | |
109 | ||
110 | if (s->cleanup) | |
111 | unit_add_to_cleanup_queue(u); | |
112 | ||
113 | return 0; | |
114 | } | |
115 | ||
116 | static int snapshot_stop(Unit *u) { | |
117 | Snapshot *s = SNAPSHOT(u); | |
118 | ||
119 | assert(s); | |
120 | assert(s->state == SNAPSHOT_ACTIVE); | |
121 | ||
122 | snapshot_set_state(s, SNAPSHOT_DEAD); | |
123 | return 0; | |
5cb5a6ff LP |
124 | } |
125 | ||
a16e1123 LP |
126 | static int snapshot_serialize(Unit *u, FILE *f, FDSet *fds) { |
127 | Snapshot *s = SNAPSHOT(u); | |
128 | Unit *other; | |
129 | Iterator i; | |
130 | ||
131 | assert(s); | |
132 | assert(f); | |
133 | assert(fds); | |
134 | ||
135 | unit_serialize_item(u, f, "state", snapshot_state_to_string(s->state)); | |
136 | unit_serialize_item(u, f, "cleanup", yes_no(s->cleanup)); | |
ac155bb8 MS |
137 | SET_FOREACH(other, u->dependencies[UNIT_WANTS], i) |
138 | unit_serialize_item(u, f, "wants", other->id); | |
a16e1123 LP |
139 | |
140 | return 0; | |
141 | } | |
142 | ||
143 | static int snapshot_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
144 | Snapshot *s = SNAPSHOT(u); | |
145 | int r; | |
146 | ||
147 | assert(u); | |
148 | assert(key); | |
149 | assert(value); | |
150 | assert(fds); | |
151 | ||
152 | if (streq(key, "state")) { | |
153 | SnapshotState state; | |
154 | ||
a190eeb8 LP |
155 | state = snapshot_state_from_string(value); |
156 | if (state < 0) | |
a16e1123 LP |
157 | log_debug("Failed to parse state value %s", value); |
158 | else | |
159 | s->deserialized_state = state; | |
160 | ||
161 | } else if (streq(key, "cleanup")) { | |
162 | ||
a190eeb8 LP |
163 | r = parse_boolean(value); |
164 | if (r < 0) | |
a16e1123 LP |
165 | log_debug("Failed to parse cleanup value %s", value); |
166 | else | |
167 | s->cleanup = r; | |
168 | ||
daf32cc7 | 169 | } else if (streq(key, "wants")) { |
a16e1123 | 170 | |
a190eeb8 LP |
171 | r = unit_add_two_dependencies_by_name(u, UNIT_AFTER, UNIT_WANTS, value, NULL, true); |
172 | if (r < 0) | |
a16e1123 LP |
173 | return r; |
174 | } else | |
175 | log_debug("Unknown serialization key '%s'", key); | |
176 | ||
177 | return 0; | |
178 | } | |
179 | ||
44a6b1b6 | 180 | _pure_ static UnitActiveState snapshot_active_state(Unit *u) { |
41447faf LP |
181 | assert(u); |
182 | ||
183 | return state_translation_table[SNAPSHOT(u)->state]; | |
184 | } | |
185 | ||
44a6b1b6 | 186 | _pure_ static const char *snapshot_sub_state_to_string(Unit *u) { |
41447faf LP |
187 | assert(u); |
188 | ||
a16e1123 | 189 | return snapshot_state_to_string(SNAPSHOT(u)->state); |
41447faf LP |
190 | } |
191 | ||
718db961 | 192 | int snapshot_create(Manager *m, const char *name, bool cleanup, sd_bus_error *e, Snapshot **_s) { |
a190eeb8 | 193 | _cleanup_free_ char *n = NULL; |
a16e1123 | 194 | Unit *other, *u = NULL; |
a190eeb8 | 195 | Iterator i; |
41447faf | 196 | int r; |
a16e1123 | 197 | const char *k; |
41447faf LP |
198 | |
199 | assert(m); | |
200 | assert(_s); | |
201 | ||
202 | if (name) { | |
718db961 LP |
203 | if (!unit_name_is_valid(name, false)) |
204 | return sd_bus_error_setf(e, SD_BUS_ERROR_INVALID_ARGS, "Unit name %s is not valid.", name); | |
41447faf | 205 | |
718db961 LP |
206 | if (unit_name_to_type(name) != UNIT_SNAPSHOT) |
207 | return sd_bus_error_setf(e, SD_BUS_ERROR_INVALID_ARGS, "Unit name %s lacks snapshot suffix.", name); | |
41447faf | 208 | |
718db961 LP |
209 | if (manager_get_unit(m, name)) |
210 | sd_bus_error_setf(e, BUS_ERROR_UNIT_EXISTS, "Snapshot %s exists already.", name); | |
41447faf LP |
211 | |
212 | } else { | |
213 | ||
214 | for (;;) { | |
215 | if (asprintf(&n, "snapshot-%u.snapshot", ++ m->n_snapshots) < 0) | |
216 | return -ENOMEM; | |
217 | ||
ebec5783 ZJS |
218 | if (!manager_get_unit(m, n)) { |
219 | name = n; | |
41447faf | 220 | break; |
ebec5783 | 221 | } |
41447faf LP |
222 | |
223 | free(n); | |
a190eeb8 | 224 | n = NULL; |
41447faf | 225 | } |
41447faf LP |
226 | } |
227 | ||
398ef8ba | 228 | r = manager_load_unit_prepare(m, name, NULL, e, &u); |
41447faf | 229 | if (r < 0) |
a16e1123 LP |
230 | goto fail; |
231 | ||
a190eeb8 | 232 | u->transient = true; |
6ec1117a | 233 | manager_dispatch_load_queue(m); |
ac155bb8 | 234 | assert(u->load_state == UNIT_LOADED); |
6ec1117a | 235 | |
a16e1123 LP |
236 | HASHMAP_FOREACH_KEY(other, k, m->units, i) { |
237 | ||
a190eeb8 LP |
238 | if (other->ignore_on_snapshot || |
239 | other->transient) | |
a16e1123 LP |
240 | continue; |
241 | ||
ac155bb8 | 242 | if (k != other->id) |
a16e1123 LP |
243 | continue; |
244 | ||
701cc384 LP |
245 | if (UNIT_VTABLE(other)->check_snapshot) |
246 | if (!UNIT_VTABLE(other)->check_snapshot(other)) | |
247 | continue; | |
248 | ||
a16e1123 LP |
249 | if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other))) |
250 | continue; | |
251 | ||
a190eeb8 LP |
252 | r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_WANTS, other, true); |
253 | if (r < 0) | |
a16e1123 LP |
254 | goto fail; |
255 | } | |
41447faf LP |
256 | |
257 | SNAPSHOT(u)->cleanup = cleanup; | |
258 | *_s = SNAPSHOT(u); | |
259 | ||
260 | return 0; | |
a16e1123 LP |
261 | |
262 | fail: | |
263 | if (u) | |
264 | unit_add_to_cleanup_queue(u); | |
265 | ||
266 | return r; | |
41447faf LP |
267 | } |
268 | ||
269 | void snapshot_remove(Snapshot *s) { | |
270 | assert(s); | |
271 | ||
272 | unit_add_to_cleanup_queue(UNIT(s)); | |
034c6ed7 LP |
273 | } |
274 | ||
a16e1123 LP |
275 | static const char* const snapshot_state_table[_SNAPSHOT_STATE_MAX] = { |
276 | [SNAPSHOT_DEAD] = "dead", | |
277 | [SNAPSHOT_ACTIVE] = "active" | |
278 | }; | |
279 | ||
280 | DEFINE_STRING_TABLE_LOOKUP(snapshot_state, SnapshotState); | |
281 | ||
87f0e418 | 282 | const UnitVTable snapshot_vtable = { |
7d17cfbc | 283 | .object_size = sizeof(Snapshot), |
5cb5a6ff | 284 | |
41447faf LP |
285 | .no_alias = true, |
286 | .no_instances = true, | |
701cc384 | 287 | .no_gc = true, |
41447faf | 288 | |
7a6000a6 | 289 | .init = snapshot_init, |
6ec1117a | 290 | .load = snapshot_load, |
718db961 | 291 | |
a16e1123 | 292 | .coldplug = snapshot_coldplug, |
41447faf LP |
293 | |
294 | .dump = snapshot_dump, | |
295 | ||
296 | .start = snapshot_start, | |
297 | .stop = snapshot_stop, | |
298 | ||
a16e1123 LP |
299 | .serialize = snapshot_serialize, |
300 | .deserialize_item = snapshot_deserialize_item, | |
301 | ||
41447faf LP |
302 | .active_state = snapshot_active_state, |
303 | .sub_state_to_string = snapshot_sub_state_to_string, | |
5cb5a6ff | 304 | |
c4e2ceae | 305 | .bus_interface = "org.freedesktop.systemd1.Snapshot", |
718db961 | 306 | .bus_vtable = bus_snapshot_vtable |
5cb5a6ff | 307 | }; |