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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 | |
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. | |
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 | General Public License for more details. | |
17 | ||
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/>. | |
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 | ||
a16e1123 LP |
35 | static void snapshot_set_state(Snapshot *s, SnapshotState state) { |
36 | SnapshotState old_state; | |
37 | assert(s); | |
41447faf | 38 | |
a16e1123 LP |
39 | old_state = s->state; |
40 | s->state = state; | |
41447faf | 41 | |
a16e1123 | 42 | if (state != old_state) |
40d50879 | 43 | log_debug("%s changed %s -> %s", |
4cd1fbcc | 44 | s->meta.id, |
a16e1123 LP |
45 | snapshot_state_to_string(old_state), |
46 | snapshot_state_to_string(state)); | |
5cb5a6ff | 47 | |
a16e1123 LP |
48 | unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state]); |
49 | } | |
41447faf | 50 | |
6ec1117a LP |
51 | static int snapshot_load(Unit *u) { |
52 | Snapshot *s = SNAPSHOT(u); | |
53 | ||
54 | assert(u); | |
55 | assert(u->meta.load_state == UNIT_STUB); | |
56 | ||
57 | /* Make sure that only snapshots created via snapshot_create() | |
58 | * can be loaded */ | |
9f611ad8 | 59 | if (!s->by_snapshot_create && s->meta.manager->n_deserializing <= 0) |
6ec1117a LP |
60 | return -ENOENT; |
61 | ||
62 | u->meta.load_state = UNIT_LOADED; | |
63 | return 0; | |
64 | } | |
65 | ||
a16e1123 LP |
66 | static int snapshot_coldplug(Unit *u) { |
67 | Snapshot *s = SNAPSHOT(u); | |
41447faf | 68 | |
a16e1123 LP |
69 | assert(s); |
70 | assert(s->state == SNAPSHOT_DEAD); | |
41447faf | 71 | |
a16e1123 LP |
72 | if (s->deserialized_state != s->state) |
73 | snapshot_set_state(s, s->deserialized_state); | |
41447faf LP |
74 | |
75 | return 0; | |
76 | } | |
77 | ||
78 | static void snapshot_dump(Unit *u, FILE *f, const char *prefix) { | |
87f0e418 | 79 | Snapshot *s = SNAPSHOT(u); |
5cb5a6ff LP |
80 | |
81 | assert(s); | |
41447faf | 82 | assert(f); |
5cb5a6ff | 83 | |
41447faf LP |
84 | fprintf(f, |
85 | "%sSnapshot State: %s\n" | |
86 | "%sClean Up: %s\n", | |
a16e1123 | 87 | prefix, snapshot_state_to_string(s->state), |
41447faf LP |
88 | prefix, yes_no(s->cleanup)); |
89 | } | |
90 | ||
41447faf LP |
91 | static int snapshot_start(Unit *u) { |
92 | Snapshot *s = SNAPSHOT(u); | |
93 | ||
94 | assert(s); | |
95 | assert(s->state == SNAPSHOT_DEAD); | |
96 | ||
97 | snapshot_set_state(s, SNAPSHOT_ACTIVE); | |
98 | ||
99 | if (s->cleanup) | |
100 | unit_add_to_cleanup_queue(u); | |
101 | ||
102 | return 0; | |
103 | } | |
104 | ||
105 | static int snapshot_stop(Unit *u) { | |
106 | Snapshot *s = SNAPSHOT(u); | |
107 | ||
108 | assert(s); | |
109 | assert(s->state == SNAPSHOT_ACTIVE); | |
110 | ||
111 | snapshot_set_state(s, SNAPSHOT_DEAD); | |
112 | return 0; | |
5cb5a6ff LP |
113 | } |
114 | ||
a16e1123 LP |
115 | static int snapshot_serialize(Unit *u, FILE *f, FDSet *fds) { |
116 | Snapshot *s = SNAPSHOT(u); | |
117 | Unit *other; | |
118 | Iterator i; | |
119 | ||
120 | assert(s); | |
121 | assert(f); | |
122 | assert(fds); | |
123 | ||
124 | unit_serialize_item(u, f, "state", snapshot_state_to_string(s->state)); | |
125 | unit_serialize_item(u, f, "cleanup", yes_no(s->cleanup)); | |
daf32cc7 LP |
126 | SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i) |
127 | unit_serialize_item(u, f, "wants", other->meta.id); | |
a16e1123 LP |
128 | |
129 | return 0; | |
130 | } | |
131 | ||
132 | static int snapshot_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
133 | Snapshot *s = SNAPSHOT(u); | |
134 | int r; | |
135 | ||
136 | assert(u); | |
137 | assert(key); | |
138 | assert(value); | |
139 | assert(fds); | |
140 | ||
141 | if (streq(key, "state")) { | |
142 | SnapshotState state; | |
143 | ||
144 | if ((state = snapshot_state_from_string(value)) < 0) | |
145 | log_debug("Failed to parse state value %s", value); | |
146 | else | |
147 | s->deserialized_state = state; | |
148 | ||
149 | } else if (streq(key, "cleanup")) { | |
150 | ||
151 | if ((r = parse_boolean(value)) < 0) | |
152 | log_debug("Failed to parse cleanup value %s", value); | |
153 | else | |
154 | s->cleanup = r; | |
155 | ||
daf32cc7 | 156 | } else if (streq(key, "wants")) { |
a16e1123 | 157 | |
daf32cc7 | 158 | if ((r = unit_add_two_dependencies_by_name(u, UNIT_AFTER, UNIT_WANTS, value, NULL, true)) < 0) |
a16e1123 LP |
159 | return r; |
160 | } else | |
161 | log_debug("Unknown serialization key '%s'", key); | |
162 | ||
163 | return 0; | |
164 | } | |
165 | ||
87f0e418 | 166 | static UnitActiveState snapshot_active_state(Unit *u) { |
41447faf LP |
167 | assert(u); |
168 | ||
169 | return state_translation_table[SNAPSHOT(u)->state]; | |
170 | } | |
171 | ||
172 | static const char *snapshot_sub_state_to_string(Unit *u) { | |
173 | assert(u); | |
174 | ||
a16e1123 | 175 | return snapshot_state_to_string(SNAPSHOT(u)->state); |
41447faf LP |
176 | } |
177 | ||
398ef8ba | 178 | int snapshot_create(Manager *m, const char *name, bool cleanup, DBusError *e, Snapshot **_s) { |
a16e1123 LP |
179 | Iterator i; |
180 | Unit *other, *u = NULL; | |
41447faf LP |
181 | char *n = NULL; |
182 | int r; | |
a16e1123 | 183 | const char *k; |
41447faf LP |
184 | |
185 | assert(m); | |
186 | assert(_s); | |
187 | ||
188 | if (name) { | |
398ef8ba LP |
189 | if (!unit_name_is_valid(name)) { |
190 | dbus_set_error(e, BUS_ERROR_INVALID_NAME, "Unit name %s is not valid.", name); | |
41447faf | 191 | return -EINVAL; |
398ef8ba | 192 | } |
41447faf | 193 | |
398ef8ba LP |
194 | if (unit_name_to_type(name) != UNIT_SNAPSHOT) { |
195 | dbus_set_error(e, BUS_ERROR_UNIT_TYPE_MISMATCH, "Unit name %s lacks snapshot suffix.", name); | |
41447faf | 196 | return -EINVAL; |
398ef8ba | 197 | } |
41447faf | 198 | |
398ef8ba LP |
199 | if (manager_get_unit(m, name)) { |
200 | dbus_set_error(e, BUS_ERROR_UNIT_EXISTS, "Snapshot %s exists already.", name); | |
41447faf | 201 | return -EEXIST; |
398ef8ba | 202 | } |
41447faf LP |
203 | |
204 | } else { | |
205 | ||
206 | for (;;) { | |
207 | if (asprintf(&n, "snapshot-%u.snapshot", ++ m->n_snapshots) < 0) | |
208 | return -ENOMEM; | |
209 | ||
210 | if (!manager_get_unit(m, n)) | |
211 | break; | |
212 | ||
213 | free(n); | |
214 | } | |
215 | ||
216 | name = n; | |
217 | } | |
218 | ||
398ef8ba | 219 | r = manager_load_unit_prepare(m, name, NULL, e, &u); |
41447faf LP |
220 | free(n); |
221 | ||
222 | if (r < 0) | |
a16e1123 LP |
223 | goto fail; |
224 | ||
6ec1117a LP |
225 | SNAPSHOT(u)->by_snapshot_create = true; |
226 | manager_dispatch_load_queue(m); | |
227 | assert(u->meta.load_state == UNIT_LOADED); | |
228 | ||
a16e1123 LP |
229 | HASHMAP_FOREACH_KEY(other, k, m->units, i) { |
230 | ||
231 | if (UNIT_VTABLE(other)->no_snapshots) | |
232 | continue; | |
233 | ||
234 | if (k != other->meta.id) | |
235 | continue; | |
236 | ||
701cc384 LP |
237 | if (UNIT_VTABLE(other)->check_snapshot) |
238 | if (!UNIT_VTABLE(other)->check_snapshot(other)) | |
239 | continue; | |
240 | ||
a16e1123 LP |
241 | if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other))) |
242 | continue; | |
243 | ||
daf32cc7 | 244 | if ((r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_WANTS, other, true)) < 0) |
a16e1123 LP |
245 | goto fail; |
246 | } | |
41447faf LP |
247 | |
248 | SNAPSHOT(u)->cleanup = cleanup; | |
249 | *_s = SNAPSHOT(u); | |
250 | ||
251 | return 0; | |
a16e1123 LP |
252 | |
253 | fail: | |
254 | if (u) | |
255 | unit_add_to_cleanup_queue(u); | |
256 | ||
257 | return r; | |
41447faf LP |
258 | } |
259 | ||
260 | void snapshot_remove(Snapshot *s) { | |
261 | assert(s); | |
262 | ||
263 | unit_add_to_cleanup_queue(UNIT(s)); | |
034c6ed7 LP |
264 | } |
265 | ||
a16e1123 LP |
266 | static const char* const snapshot_state_table[_SNAPSHOT_STATE_MAX] = { |
267 | [SNAPSHOT_DEAD] = "dead", | |
268 | [SNAPSHOT_ACTIVE] = "active" | |
269 | }; | |
270 | ||
271 | DEFINE_STRING_TABLE_LOOKUP(snapshot_state, SnapshotState); | |
272 | ||
87f0e418 | 273 | const UnitVTable snapshot_vtable = { |
5cb5a6ff LP |
274 | .suffix = ".snapshot", |
275 | ||
41447faf LP |
276 | .no_alias = true, |
277 | .no_instances = true, | |
278 | .no_snapshots = true, | |
701cc384 | 279 | .no_gc = true, |
41447faf | 280 | |
6ec1117a | 281 | .load = snapshot_load, |
a16e1123 | 282 | .coldplug = snapshot_coldplug, |
41447faf LP |
283 | |
284 | .dump = snapshot_dump, | |
285 | ||
286 | .start = snapshot_start, | |
287 | .stop = snapshot_stop, | |
288 | ||
a16e1123 LP |
289 | .serialize = snapshot_serialize, |
290 | .deserialize_item = snapshot_deserialize_item, | |
291 | ||
41447faf LP |
292 | .active_state = snapshot_active_state, |
293 | .sub_state_to_string = snapshot_sub_state_to_string, | |
5cb5a6ff | 294 | |
c4e2ceae | 295 | .bus_interface = "org.freedesktop.systemd1.Snapshot", |
41447faf | 296 | .bus_message_handler = bus_snapshot_message_handler |
5cb5a6ff | 297 | }; |