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