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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; | |
7a6000a6 LP |
43 | } |
44 | ||
a16e1123 LP |
45 | static void snapshot_set_state(Snapshot *s, SnapshotState state) { |
46 | SnapshotState old_state; | |
47 | assert(s); | |
41447faf | 48 | |
a16e1123 LP |
49 | old_state = s->state; |
50 | s->state = state; | |
41447faf | 51 | |
a16e1123 | 52 | if (state != old_state) |
40d50879 | 53 | log_debug("%s changed %s -> %s", |
1124fe6f | 54 | UNIT(s)->id, |
a16e1123 LP |
55 | snapshot_state_to_string(old_state), |
56 | snapshot_state_to_string(state)); | |
5cb5a6ff | 57 | |
e2f3b44c | 58 | unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true); |
a16e1123 | 59 | } |
41447faf | 60 | |
6ec1117a LP |
61 | static int snapshot_load(Unit *u) { |
62 | Snapshot *s = SNAPSHOT(u); | |
63 | ||
64 | assert(u); | |
ac155bb8 | 65 | assert(u->load_state == UNIT_STUB); |
6ec1117a LP |
66 | |
67 | /* Make sure that only snapshots created via snapshot_create() | |
68 | * can be loaded */ | |
1124fe6f | 69 | if (!s->by_snapshot_create && UNIT(s)->manager->n_reloading <= 0) |
6ec1117a LP |
70 | return -ENOENT; |
71 | ||
ac155bb8 | 72 | u->load_state = UNIT_LOADED; |
6ec1117a LP |
73 | return 0; |
74 | } | |
75 | ||
a16e1123 LP |
76 | static int snapshot_coldplug(Unit *u) { |
77 | Snapshot *s = SNAPSHOT(u); | |
41447faf | 78 | |
a16e1123 LP |
79 | assert(s); |
80 | assert(s->state == SNAPSHOT_DEAD); | |
41447faf | 81 | |
a16e1123 LP |
82 | if (s->deserialized_state != s->state) |
83 | snapshot_set_state(s, s->deserialized_state); | |
41447faf LP |
84 | |
85 | return 0; | |
86 | } | |
87 | ||
88 | static void snapshot_dump(Unit *u, FILE *f, const char *prefix) { | |
87f0e418 | 89 | Snapshot *s = SNAPSHOT(u); |
5cb5a6ff LP |
90 | |
91 | assert(s); | |
41447faf | 92 | assert(f); |
5cb5a6ff | 93 | |
41447faf LP |
94 | fprintf(f, |
95 | "%sSnapshot State: %s\n" | |
96 | "%sClean Up: %s\n", | |
a16e1123 | 97 | prefix, snapshot_state_to_string(s->state), |
41447faf LP |
98 | prefix, yes_no(s->cleanup)); |
99 | } | |
100 | ||
41447faf LP |
101 | static int snapshot_start(Unit *u) { |
102 | Snapshot *s = SNAPSHOT(u); | |
103 | ||
104 | assert(s); | |
105 | assert(s->state == SNAPSHOT_DEAD); | |
106 | ||
107 | snapshot_set_state(s, SNAPSHOT_ACTIVE); | |
108 | ||
109 | if (s->cleanup) | |
110 | unit_add_to_cleanup_queue(u); | |
111 | ||
112 | return 0; | |
113 | } | |
114 | ||
115 | static int snapshot_stop(Unit *u) { | |
116 | Snapshot *s = SNAPSHOT(u); | |
117 | ||
118 | assert(s); | |
119 | assert(s->state == SNAPSHOT_ACTIVE); | |
120 | ||
121 | snapshot_set_state(s, SNAPSHOT_DEAD); | |
122 | return 0; | |
5cb5a6ff LP |
123 | } |
124 | ||
a16e1123 LP |
125 | static int snapshot_serialize(Unit *u, FILE *f, FDSet *fds) { |
126 | Snapshot *s = SNAPSHOT(u); | |
127 | Unit *other; | |
128 | Iterator i; | |
129 | ||
130 | assert(s); | |
131 | assert(f); | |
132 | assert(fds); | |
133 | ||
134 | unit_serialize_item(u, f, "state", snapshot_state_to_string(s->state)); | |
135 | unit_serialize_item(u, f, "cleanup", yes_no(s->cleanup)); | |
ac155bb8 MS |
136 | SET_FOREACH(other, u->dependencies[UNIT_WANTS], i) |
137 | unit_serialize_item(u, f, "wants", other->id); | |
a16e1123 LP |
138 | |
139 | return 0; | |
140 | } | |
141 | ||
142 | static int snapshot_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
143 | Snapshot *s = SNAPSHOT(u); | |
144 | int r; | |
145 | ||
146 | assert(u); | |
147 | assert(key); | |
148 | assert(value); | |
149 | assert(fds); | |
150 | ||
151 | if (streq(key, "state")) { | |
152 | SnapshotState state; | |
153 | ||
154 | if ((state = snapshot_state_from_string(value)) < 0) | |
155 | log_debug("Failed to parse state value %s", value); | |
156 | else | |
157 | s->deserialized_state = state; | |
158 | ||
159 | } else if (streq(key, "cleanup")) { | |
160 | ||
161 | if ((r = parse_boolean(value)) < 0) | |
162 | log_debug("Failed to parse cleanup value %s", value); | |
163 | else | |
164 | s->cleanup = r; | |
165 | ||
daf32cc7 | 166 | } else if (streq(key, "wants")) { |
a16e1123 | 167 | |
daf32cc7 | 168 | if ((r = unit_add_two_dependencies_by_name(u, UNIT_AFTER, UNIT_WANTS, value, NULL, true)) < 0) |
a16e1123 LP |
169 | return r; |
170 | } else | |
171 | log_debug("Unknown serialization key '%s'", key); | |
172 | ||
173 | return 0; | |
174 | } | |
175 | ||
44a6b1b6 | 176 | _pure_ static UnitActiveState snapshot_active_state(Unit *u) { |
41447faf LP |
177 | assert(u); |
178 | ||
179 | return state_translation_table[SNAPSHOT(u)->state]; | |
180 | } | |
181 | ||
44a6b1b6 | 182 | _pure_ static const char *snapshot_sub_state_to_string(Unit *u) { |
41447faf LP |
183 | assert(u); |
184 | ||
a16e1123 | 185 | return snapshot_state_to_string(SNAPSHOT(u)->state); |
41447faf LP |
186 | } |
187 | ||
398ef8ba | 188 | int snapshot_create(Manager *m, const char *name, bool cleanup, DBusError *e, Snapshot **_s) { |
a16e1123 LP |
189 | Iterator i; |
190 | Unit *other, *u = NULL; | |
41447faf LP |
191 | char *n = NULL; |
192 | int r; | |
a16e1123 | 193 | const char *k; |
41447faf LP |
194 | |
195 | assert(m); | |
196 | assert(_s); | |
197 | ||
198 | if (name) { | |
b9c0d441 | 199 | if (!unit_name_is_valid(name, false)) { |
398ef8ba | 200 | dbus_set_error(e, BUS_ERROR_INVALID_NAME, "Unit name %s is not valid.", name); |
41447faf | 201 | return -EINVAL; |
398ef8ba | 202 | } |
41447faf | 203 | |
398ef8ba LP |
204 | if (unit_name_to_type(name) != UNIT_SNAPSHOT) { |
205 | dbus_set_error(e, BUS_ERROR_UNIT_TYPE_MISMATCH, "Unit name %s lacks snapshot suffix.", name); | |
41447faf | 206 | return -EINVAL; |
398ef8ba | 207 | } |
41447faf | 208 | |
398ef8ba LP |
209 | if (manager_get_unit(m, name)) { |
210 | dbus_set_error(e, BUS_ERROR_UNIT_EXISTS, "Snapshot %s exists already.", name); | |
41447faf | 211 | return -EEXIST; |
398ef8ba | 212 | } |
41447faf LP |
213 | |
214 | } else { | |
215 | ||
216 | for (;;) { | |
217 | if (asprintf(&n, "snapshot-%u.snapshot", ++ m->n_snapshots) < 0) | |
218 | return -ENOMEM; | |
219 | ||
220 | if (!manager_get_unit(m, n)) | |
221 | break; | |
222 | ||
223 | free(n); | |
224 | } | |
225 | ||
226 | name = n; | |
227 | } | |
228 | ||
398ef8ba | 229 | r = manager_load_unit_prepare(m, name, NULL, e, &u); |
41447faf LP |
230 | free(n); |
231 | ||
232 | if (r < 0) | |
a16e1123 LP |
233 | goto fail; |
234 | ||
6ec1117a LP |
235 | SNAPSHOT(u)->by_snapshot_create = true; |
236 | manager_dispatch_load_queue(m); | |
ac155bb8 | 237 | assert(u->load_state == UNIT_LOADED); |
6ec1117a | 238 | |
a16e1123 LP |
239 | HASHMAP_FOREACH_KEY(other, k, m->units, i) { |
240 | ||
ac155bb8 | 241 | if (other->ignore_on_snapshot) |
a16e1123 LP |
242 | continue; |
243 | ||
ac155bb8 | 244 | if (k != other->id) |
a16e1123 LP |
245 | continue; |
246 | ||
701cc384 LP |
247 | if (UNIT_VTABLE(other)->check_snapshot) |
248 | if (!UNIT_VTABLE(other)->check_snapshot(other)) | |
249 | continue; | |
250 | ||
a16e1123 LP |
251 | if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other))) |
252 | continue; | |
253 | ||
daf32cc7 | 254 | if ((r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_WANTS, other, true)) < 0) |
a16e1123 LP |
255 | goto fail; |
256 | } | |
41447faf LP |
257 | |
258 | SNAPSHOT(u)->cleanup = cleanup; | |
aa7c3195 | 259 | u->allow_isolate = true; |
41447faf LP |
260 | *_s = SNAPSHOT(u); |
261 | ||
262 | return 0; | |
a16e1123 LP |
263 | |
264 | fail: | |
265 | if (u) | |
266 | unit_add_to_cleanup_queue(u); | |
267 | ||
268 | return r; | |
41447faf LP |
269 | } |
270 | ||
271 | void snapshot_remove(Snapshot *s) { | |
272 | assert(s); | |
273 | ||
274 | unit_add_to_cleanup_queue(UNIT(s)); | |
034c6ed7 LP |
275 | } |
276 | ||
a16e1123 LP |
277 | static const char* const snapshot_state_table[_SNAPSHOT_STATE_MAX] = { |
278 | [SNAPSHOT_DEAD] = "dead", | |
279 | [SNAPSHOT_ACTIVE] = "active" | |
280 | }; | |
281 | ||
282 | DEFINE_STRING_TABLE_LOOKUP(snapshot_state, SnapshotState); | |
283 | ||
87f0e418 | 284 | const UnitVTable snapshot_vtable = { |
7d17cfbc | 285 | .object_size = sizeof(Snapshot), |
5cb5a6ff | 286 | |
41447faf LP |
287 | .no_alias = true, |
288 | .no_instances = true, | |
701cc384 | 289 | .no_gc = true, |
41447faf | 290 | |
7a6000a6 LP |
291 | .init = snapshot_init, |
292 | ||
6ec1117a | 293 | .load = snapshot_load, |
a16e1123 | 294 | .coldplug = snapshot_coldplug, |
41447faf LP |
295 | |
296 | .dump = snapshot_dump, | |
297 | ||
298 | .start = snapshot_start, | |
299 | .stop = snapshot_stop, | |
300 | ||
a16e1123 LP |
301 | .serialize = snapshot_serialize, |
302 | .deserialize_item = snapshot_deserialize_item, | |
303 | ||
41447faf LP |
304 | .active_state = snapshot_active_state, |
305 | .sub_state_to_string = snapshot_sub_state_to_string, | |
5cb5a6ff | 306 | |
c4e2ceae | 307 | .bus_interface = "org.freedesktop.systemd1.Snapshot", |
41447faf | 308 | .bus_message_handler = bus_snapshot_message_handler |
5cb5a6ff | 309 | }; |