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5cb5a6ff LP |
1 | /*-*- Mode: C; c-basic-offset: 8 -*-*/ |
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" | |
28 | ||
29 | static const UnitActiveState state_translation_table[_SNAPSHOT_STATE_MAX] = { | |
30 | [SNAPSHOT_DEAD] = UNIT_INACTIVE, | |
31 | [SNAPSHOT_ACTIVE] = UNIT_ACTIVE | |
32 | }; | |
33 | ||
a16e1123 LP |
34 | static void snapshot_set_state(Snapshot *s, SnapshotState state) { |
35 | SnapshotState old_state; | |
36 | assert(s); | |
41447faf | 37 | |
a16e1123 LP |
38 | old_state = s->state; |
39 | s->state = state; | |
41447faf | 40 | |
a16e1123 | 41 | if (state != old_state) |
40d50879 | 42 | log_debug("%s changed %s -> %s", |
4cd1fbcc | 43 | s->meta.id, |
a16e1123 LP |
44 | snapshot_state_to_string(old_state), |
45 | snapshot_state_to_string(state)); | |
5cb5a6ff | 46 | |
a16e1123 LP |
47 | unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state]); |
48 | } | |
41447faf | 49 | |
6ec1117a LP |
50 | static int snapshot_load(Unit *u) { |
51 | Snapshot *s = SNAPSHOT(u); | |
52 | ||
53 | assert(u); | |
54 | assert(u->meta.load_state == UNIT_STUB); | |
55 | ||
56 | /* Make sure that only snapshots created via snapshot_create() | |
57 | * can be loaded */ | |
58 | if (!s->by_snapshot_create) | |
59 | return -ENOENT; | |
60 | ||
61 | u->meta.load_state = UNIT_LOADED; | |
62 | return 0; | |
63 | } | |
64 | ||
a16e1123 LP |
65 | static int snapshot_coldplug(Unit *u) { |
66 | Snapshot *s = SNAPSHOT(u); | |
41447faf | 67 | |
a16e1123 LP |
68 | assert(s); |
69 | assert(s->state == SNAPSHOT_DEAD); | |
41447faf | 70 | |
a16e1123 LP |
71 | if (s->deserialized_state != s->state) |
72 | snapshot_set_state(s, s->deserialized_state); | |
41447faf LP |
73 | |
74 | return 0; | |
75 | } | |
76 | ||
77 | static void snapshot_dump(Unit *u, FILE *f, const char *prefix) { | |
87f0e418 | 78 | Snapshot *s = SNAPSHOT(u); |
5cb5a6ff LP |
79 | |
80 | assert(s); | |
41447faf | 81 | assert(f); |
5cb5a6ff | 82 | |
41447faf LP |
83 | fprintf(f, |
84 | "%sSnapshot State: %s\n" | |
85 | "%sClean Up: %s\n", | |
a16e1123 | 86 | prefix, snapshot_state_to_string(s->state), |
41447faf LP |
87 | prefix, yes_no(s->cleanup)); |
88 | } | |
89 | ||
41447faf LP |
90 | static int snapshot_start(Unit *u) { |
91 | Snapshot *s = SNAPSHOT(u); | |
92 | ||
93 | assert(s); | |
94 | assert(s->state == SNAPSHOT_DEAD); | |
95 | ||
96 | snapshot_set_state(s, SNAPSHOT_ACTIVE); | |
97 | ||
98 | if (s->cleanup) | |
99 | unit_add_to_cleanup_queue(u); | |
100 | ||
101 | return 0; | |
102 | } | |
103 | ||
104 | static int snapshot_stop(Unit *u) { | |
105 | Snapshot *s = SNAPSHOT(u); | |
106 | ||
107 | assert(s); | |
108 | assert(s->state == SNAPSHOT_ACTIVE); | |
109 | ||
110 | snapshot_set_state(s, SNAPSHOT_DEAD); | |
111 | return 0; | |
5cb5a6ff LP |
112 | } |
113 | ||
a16e1123 LP |
114 | static int snapshot_serialize(Unit *u, FILE *f, FDSet *fds) { |
115 | Snapshot *s = SNAPSHOT(u); | |
116 | Unit *other; | |
117 | Iterator i; | |
118 | ||
119 | assert(s); | |
120 | assert(f); | |
121 | assert(fds); | |
122 | ||
123 | unit_serialize_item(u, f, "state", snapshot_state_to_string(s->state)); | |
124 | unit_serialize_item(u, f, "cleanup", yes_no(s->cleanup)); | |
125 | SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i) | |
126 | unit_serialize_item(u, f, "requires", other->meta.id); | |
127 | ||
128 | return 0; | |
129 | } | |
130 | ||
131 | static int snapshot_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
132 | Snapshot *s = SNAPSHOT(u); | |
133 | int r; | |
134 | ||
135 | assert(u); | |
136 | assert(key); | |
137 | assert(value); | |
138 | assert(fds); | |
139 | ||
140 | if (streq(key, "state")) { | |
141 | SnapshotState state; | |
142 | ||
143 | if ((state = snapshot_state_from_string(value)) < 0) | |
144 | log_debug("Failed to parse state value %s", value); | |
145 | else | |
146 | s->deserialized_state = state; | |
147 | ||
148 | } else if (streq(key, "cleanup")) { | |
149 | ||
150 | if ((r = parse_boolean(value)) < 0) | |
151 | log_debug("Failed to parse cleanup value %s", value); | |
152 | else | |
153 | s->cleanup = r; | |
154 | ||
155 | } else if (streq(key, "requires")) { | |
156 | ||
701cc384 | 157 | if ((r = unit_add_dependency_by_name(u, UNIT_AFTER, value, NULL, true)) < 0) |
a16e1123 LP |
158 | return r; |
159 | ||
701cc384 | 160 | if ((r = unit_add_dependency_by_name(u, UNIT_REQUIRES, value, NULL, true)) < 0) |
a16e1123 LP |
161 | return r; |
162 | } else | |
163 | log_debug("Unknown serialization key '%s'", key); | |
164 | ||
165 | return 0; | |
166 | } | |
167 | ||
87f0e418 | 168 | static UnitActiveState snapshot_active_state(Unit *u) { |
41447faf LP |
169 | assert(u); |
170 | ||
171 | return state_translation_table[SNAPSHOT(u)->state]; | |
172 | } | |
173 | ||
174 | static const char *snapshot_sub_state_to_string(Unit *u) { | |
175 | assert(u); | |
176 | ||
a16e1123 | 177 | return snapshot_state_to_string(SNAPSHOT(u)->state); |
41447faf LP |
178 | } |
179 | ||
180 | int snapshot_create(Manager *m, const char *name, bool cleanup, Snapshot **_s) { | |
a16e1123 LP |
181 | Iterator i; |
182 | Unit *other, *u = NULL; | |
41447faf LP |
183 | char *n = NULL; |
184 | int r; | |
a16e1123 | 185 | const char *k; |
41447faf LP |
186 | |
187 | assert(m); | |
188 | assert(_s); | |
189 | ||
190 | if (name) { | |
191 | if (!unit_name_is_valid(name)) | |
192 | return -EINVAL; | |
193 | ||
194 | if (unit_name_to_type(name) != UNIT_SNAPSHOT) | |
195 | return -EINVAL; | |
196 | ||
197 | if (manager_get_unit(m, name)) | |
198 | return -EEXIST; | |
199 | ||
200 | } else { | |
201 | ||
202 | for (;;) { | |
203 | if (asprintf(&n, "snapshot-%u.snapshot", ++ m->n_snapshots) < 0) | |
204 | return -ENOMEM; | |
205 | ||
206 | if (!manager_get_unit(m, n)) | |
207 | break; | |
208 | ||
209 | free(n); | |
210 | } | |
211 | ||
212 | name = n; | |
213 | } | |
214 | ||
6ec1117a | 215 | r = manager_load_unit_prepare(m, name, NULL, &u); |
41447faf LP |
216 | free(n); |
217 | ||
218 | if (r < 0) | |
a16e1123 LP |
219 | goto fail; |
220 | ||
6ec1117a LP |
221 | SNAPSHOT(u)->by_snapshot_create = true; |
222 | manager_dispatch_load_queue(m); | |
223 | assert(u->meta.load_state == UNIT_LOADED); | |
224 | ||
a16e1123 LP |
225 | HASHMAP_FOREACH_KEY(other, k, m->units, i) { |
226 | ||
227 | if (UNIT_VTABLE(other)->no_snapshots) | |
228 | continue; | |
229 | ||
230 | if (k != other->meta.id) | |
231 | continue; | |
232 | ||
701cc384 LP |
233 | if (UNIT_VTABLE(other)->check_snapshot) |
234 | if (!UNIT_VTABLE(other)->check_snapshot(other)) | |
235 | continue; | |
236 | ||
a16e1123 LP |
237 | if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other))) |
238 | continue; | |
239 | ||
701cc384 | 240 | if ((r = unit_add_dependency(u, UNIT_REQUIRES, other, true)) < 0) |
a16e1123 LP |
241 | goto fail; |
242 | ||
701cc384 | 243 | if ((r = unit_add_dependency(u, UNIT_AFTER, other, true)) < 0) |
a16e1123 LP |
244 | goto fail; |
245 | } | |
41447faf LP |
246 | |
247 | SNAPSHOT(u)->cleanup = cleanup; | |
248 | *_s = SNAPSHOT(u); | |
249 | ||
250 | return 0; | |
a16e1123 LP |
251 | |
252 | fail: | |
253 | if (u) | |
254 | unit_add_to_cleanup_queue(u); | |
255 | ||
256 | return r; | |
41447faf LP |
257 | } |
258 | ||
259 | void snapshot_remove(Snapshot *s) { | |
260 | assert(s); | |
261 | ||
262 | unit_add_to_cleanup_queue(UNIT(s)); | |
034c6ed7 LP |
263 | } |
264 | ||
a16e1123 LP |
265 | static const char* const snapshot_state_table[_SNAPSHOT_STATE_MAX] = { |
266 | [SNAPSHOT_DEAD] = "dead", | |
267 | [SNAPSHOT_ACTIVE] = "active" | |
268 | }; | |
269 | ||
270 | DEFINE_STRING_TABLE_LOOKUP(snapshot_state, SnapshotState); | |
271 | ||
87f0e418 | 272 | const UnitVTable snapshot_vtable = { |
5cb5a6ff LP |
273 | .suffix = ".snapshot", |
274 | ||
41447faf LP |
275 | .no_alias = true, |
276 | .no_instances = true, | |
277 | .no_snapshots = true, | |
701cc384 | 278 | .no_gc = true, |
41447faf | 279 | |
6ec1117a | 280 | .load = snapshot_load, |
a16e1123 | 281 | .coldplug = snapshot_coldplug, |
41447faf LP |
282 | |
283 | .dump = snapshot_dump, | |
284 | ||
285 | .start = snapshot_start, | |
286 | .stop = snapshot_stop, | |
287 | ||
a16e1123 LP |
288 | .serialize = snapshot_serialize, |
289 | .deserialize_item = snapshot_deserialize_item, | |
290 | ||
41447faf LP |
291 | .active_state = snapshot_active_state, |
292 | .sub_state_to_string = snapshot_sub_state_to_string, | |
5cb5a6ff | 293 | |
41447faf | 294 | .bus_message_handler = bus_snapshot_message_handler |
5cb5a6ff | 295 | }; |