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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" | |
96aad8d1 | 28 | #include "bus-common-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) |
f2341e0a | 54 | log_unit_debug(UNIT(s), "Changed %s -> %s", snapshot_state_to_string(old_state), snapshot_state_to_string(state)); |
5cb5a6ff | 55 | |
e2f3b44c | 56 | unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state], true); |
a16e1123 | 57 | } |
41447faf | 58 | |
6ec1117a LP |
59 | static int snapshot_load(Unit *u) { |
60 | Snapshot *s = SNAPSHOT(u); | |
61 | ||
62 | assert(u); | |
ac155bb8 | 63 | assert(u->load_state == UNIT_STUB); |
6ec1117a LP |
64 | |
65 | /* Make sure that only snapshots created via snapshot_create() | |
66 | * can be loaded */ | |
a190eeb8 | 67 | if (!u->transient && UNIT(s)->manager->n_reloading <= 0) |
6ec1117a LP |
68 | return -ENOENT; |
69 | ||
ac155bb8 | 70 | u->load_state = UNIT_LOADED; |
6ec1117a LP |
71 | return 0; |
72 | } | |
73 | ||
be847e82 | 74 | static int snapshot_coldplug(Unit *u) { |
a16e1123 | 75 | Snapshot *s = SNAPSHOT(u); |
41447faf | 76 | |
a16e1123 LP |
77 | assert(s); |
78 | assert(s->state == SNAPSHOT_DEAD); | |
41447faf | 79 | |
a16e1123 LP |
80 | if (s->deserialized_state != s->state) |
81 | snapshot_set_state(s, s->deserialized_state); | |
41447faf LP |
82 | |
83 | return 0; | |
84 | } | |
85 | ||
86 | static void snapshot_dump(Unit *u, FILE *f, const char *prefix) { | |
87f0e418 | 87 | Snapshot *s = SNAPSHOT(u); |
5cb5a6ff LP |
88 | |
89 | assert(s); | |
41447faf | 90 | assert(f); |
5cb5a6ff | 91 | |
41447faf LP |
92 | fprintf(f, |
93 | "%sSnapshot State: %s\n" | |
94 | "%sClean Up: %s\n", | |
a16e1123 | 95 | prefix, snapshot_state_to_string(s->state), |
41447faf LP |
96 | prefix, yes_no(s->cleanup)); |
97 | } | |
98 | ||
41447faf LP |
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 | ||
82a2b6bb | 110 | return 1; |
41447faf LP |
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); | |
82a2b6bb | 120 | return 1; |
5cb5a6ff LP |
121 | } |
122 | ||
a16e1123 LP |
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)); | |
ac155bb8 MS |
134 | SET_FOREACH(other, u->dependencies[UNIT_WANTS], i) |
135 | unit_serialize_item(u, f, "wants", other->id); | |
a16e1123 LP |
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 | ||
a190eeb8 LP |
152 | state = snapshot_state_from_string(value); |
153 | if (state < 0) | |
f2341e0a | 154 | log_unit_debug(u, "Failed to parse state value: %s", value); |
a16e1123 LP |
155 | else |
156 | s->deserialized_state = state; | |
157 | ||
158 | } else if (streq(key, "cleanup")) { | |
159 | ||
a190eeb8 LP |
160 | r = parse_boolean(value); |
161 | if (r < 0) | |
f2341e0a | 162 | log_unit_debug(u, "Failed to parse cleanup value: %s", value); |
a16e1123 LP |
163 | else |
164 | s->cleanup = r; | |
165 | ||
daf32cc7 | 166 | } else if (streq(key, "wants")) { |
a16e1123 | 167 | |
a190eeb8 LP |
168 | r = unit_add_two_dependencies_by_name(u, UNIT_AFTER, UNIT_WANTS, value, NULL, true); |
169 | if (r < 0) | |
a16e1123 LP |
170 | return r; |
171 | } else | |
f2341e0a | 172 | log_unit_debug(u, "Unknown serialization key: %s", key); |
a16e1123 LP |
173 | |
174 | return 0; | |
175 | } | |
176 | ||
44a6b1b6 | 177 | _pure_ static UnitActiveState snapshot_active_state(Unit *u) { |
41447faf LP |
178 | assert(u); |
179 | ||
180 | return state_translation_table[SNAPSHOT(u)->state]; | |
181 | } | |
182 | ||
44a6b1b6 | 183 | _pure_ static const char *snapshot_sub_state_to_string(Unit *u) { |
41447faf LP |
184 | assert(u); |
185 | ||
a16e1123 | 186 | return snapshot_state_to_string(SNAPSHOT(u)->state); |
41447faf LP |
187 | } |
188 | ||
718db961 | 189 | int snapshot_create(Manager *m, const char *name, bool cleanup, sd_bus_error *e, Snapshot **_s) { |
a190eeb8 | 190 | _cleanup_free_ char *n = NULL; |
a16e1123 | 191 | Unit *other, *u = NULL; |
a190eeb8 | 192 | Iterator i; |
41447faf | 193 | int r; |
a16e1123 | 194 | const char *k; |
41447faf LP |
195 | |
196 | assert(m); | |
197 | assert(_s); | |
198 | ||
199 | if (name) { | |
7410616c | 200 | if (!unit_name_is_valid(name, UNIT_NAME_PLAIN)) |
718db961 | 201 | return sd_bus_error_setf(e, SD_BUS_ERROR_INVALID_ARGS, "Unit name %s is not valid.", name); |
41447faf | 202 | |
7410616c | 203 | if (!endswith(name, ".snapshot")) |
718db961 | 204 | return sd_bus_error_setf(e, SD_BUS_ERROR_INVALID_ARGS, "Unit name %s lacks snapshot suffix.", name); |
41447faf | 205 | |
718db961 | 206 | if (manager_get_unit(m, name)) |
7cabba07 | 207 | return sd_bus_error_setf(e, BUS_ERROR_UNIT_EXISTS, "Snapshot %s exists already.", name); |
41447faf LP |
208 | |
209 | } else { | |
210 | ||
211 | for (;;) { | |
212 | if (asprintf(&n, "snapshot-%u.snapshot", ++ m->n_snapshots) < 0) | |
213 | return -ENOMEM; | |
214 | ||
ebec5783 ZJS |
215 | if (!manager_get_unit(m, n)) { |
216 | name = n; | |
41447faf | 217 | break; |
ebec5783 | 218 | } |
41447faf LP |
219 | |
220 | free(n); | |
a190eeb8 | 221 | n = NULL; |
41447faf | 222 | } |
41447faf LP |
223 | } |
224 | ||
398ef8ba | 225 | r = manager_load_unit_prepare(m, name, NULL, e, &u); |
41447faf | 226 | if (r < 0) |
a16e1123 LP |
227 | goto fail; |
228 | ||
a190eeb8 | 229 | u->transient = true; |
6ec1117a | 230 | manager_dispatch_load_queue(m); |
ac155bb8 | 231 | assert(u->load_state == UNIT_LOADED); |
6ec1117a | 232 | |
a16e1123 LP |
233 | HASHMAP_FOREACH_KEY(other, k, m->units, i) { |
234 | ||
a190eeb8 LP |
235 | if (other->ignore_on_snapshot || |
236 | other->transient) | |
a16e1123 LP |
237 | continue; |
238 | ||
ac155bb8 | 239 | if (k != other->id) |
a16e1123 LP |
240 | continue; |
241 | ||
701cc384 LP |
242 | if (UNIT_VTABLE(other)->check_snapshot) |
243 | if (!UNIT_VTABLE(other)->check_snapshot(other)) | |
244 | continue; | |
245 | ||
a16e1123 LP |
246 | if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(other))) |
247 | continue; | |
248 | ||
a190eeb8 LP |
249 | r = unit_add_two_dependencies(u, UNIT_AFTER, UNIT_WANTS, other, true); |
250 | if (r < 0) | |
a16e1123 LP |
251 | goto fail; |
252 | } | |
41447faf LP |
253 | |
254 | SNAPSHOT(u)->cleanup = cleanup; | |
255 | *_s = SNAPSHOT(u); | |
256 | ||
f2341e0a | 257 | log_unit_info(u, "Created snapshot."); |
6f8bd5c9 | 258 | |
41447faf | 259 | return 0; |
a16e1123 LP |
260 | |
261 | fail: | |
262 | if (u) | |
263 | unit_add_to_cleanup_queue(u); | |
264 | ||
265 | return r; | |
41447faf LP |
266 | } |
267 | ||
268 | void snapshot_remove(Snapshot *s) { | |
269 | assert(s); | |
270 | ||
f2341e0a | 271 | log_unit_info(UNIT(s), "Removing snapshot."); |
6f8bd5c9 | 272 | |
41447faf | 273 | unit_add_to_cleanup_queue(UNIT(s)); |
034c6ed7 LP |
274 | } |
275 | ||
a16e1123 LP |
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 | ||
87f0e418 | 283 | const UnitVTable snapshot_vtable = { |
7d17cfbc | 284 | .object_size = sizeof(Snapshot), |
5cb5a6ff | 285 | |
41447faf LP |
286 | .no_alias = true, |
287 | .no_instances = true, | |
701cc384 | 288 | .no_gc = true, |
41447faf | 289 | |
7a6000a6 | 290 | .init = snapshot_init, |
6ec1117a | 291 | .load = snapshot_load, |
718db961 | 292 | |
a16e1123 | 293 | .coldplug = snapshot_coldplug, |
41447faf LP |
294 | |
295 | .dump = snapshot_dump, | |
296 | ||
297 | .start = snapshot_start, | |
298 | .stop = snapshot_stop, | |
299 | ||
a16e1123 LP |
300 | .serialize = snapshot_serialize, |
301 | .deserialize_item = snapshot_deserialize_item, | |
302 | ||
41447faf LP |
303 | .active_state = snapshot_active_state, |
304 | .sub_state_to_string = snapshot_sub_state_to_string, | |
5cb5a6ff | 305 | |
c4e2ceae | 306 | .bus_interface = "org.freedesktop.systemd1.Snapshot", |
718db961 | 307 | .bus_vtable = bus_snapshot_vtable |
5cb5a6ff | 308 | }; |