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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 | ||
34 | static const char* const state_string_table[_SNAPSHOT_STATE_MAX] = { | |
35 | [SNAPSHOT_DEAD] = "dead", | |
36 | [SNAPSHOT_ACTIVE] = "active" | |
37 | }; | |
38 | ||
39 | static int snapshot_load(Unit *u) { | |
40 | Iterator i; | |
41 | Unit *other; | |
42 | int r; | |
43 | ||
44 | assert(u); | |
45 | ||
46 | HASHMAP_FOREACH(other, u->meta.manager->units, i) { | |
5cb5a6ff | 47 | |
41447faf LP |
48 | if (UNIT_VTABLE(other)->no_snapshots) |
49 | continue; | |
50 | ||
51 | if ((r = unit_add_dependency(u, UNIT_REQUIRES, other)) < 0) | |
52 | return r; | |
53 | ||
54 | if ((r = unit_add_dependency(u, UNIT_AFTER, other)) < 0) | |
55 | return r; | |
56 | } | |
57 | ||
58 | u->meta.load_state = UNIT_LOADED; | |
59 | ||
60 | return 0; | |
61 | } | |
62 | ||
63 | static void snapshot_dump(Unit *u, FILE *f, const char *prefix) { | |
87f0e418 | 64 | Snapshot *s = SNAPSHOT(u); |
5cb5a6ff LP |
65 | |
66 | assert(s); | |
41447faf | 67 | assert(f); |
5cb5a6ff | 68 | |
41447faf LP |
69 | fprintf(f, |
70 | "%sSnapshot State: %s\n" | |
71 | "%sClean Up: %s\n", | |
72 | prefix, state_string_table[s->state], | |
73 | prefix, yes_no(s->cleanup)); | |
74 | } | |
75 | ||
76 | static void snapshot_set_state(Snapshot *s, SnapshotState state) { | |
77 | SnapshotState old_state; | |
78 | assert(s); | |
79 | ||
80 | old_state = s->state; | |
81 | s->state = state; | |
82 | ||
83 | if (state != old_state) | |
84 | log_debug("%s changed %s → %s", UNIT(s)->meta.id, state_string_table[old_state], state_string_table[state]); | |
85 | ||
86 | unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state]); | |
87 | } | |
88 | ||
89 | static int snapshot_start(Unit *u) { | |
90 | Snapshot *s = SNAPSHOT(u); | |
91 | ||
92 | assert(s); | |
93 | assert(s->state == SNAPSHOT_DEAD); | |
94 | ||
95 | snapshot_set_state(s, SNAPSHOT_ACTIVE); | |
96 | ||
97 | if (s->cleanup) | |
98 | unit_add_to_cleanup_queue(u); | |
99 | ||
100 | return 0; | |
101 | } | |
102 | ||
103 | static int snapshot_stop(Unit *u) { | |
104 | Snapshot *s = SNAPSHOT(u); | |
105 | ||
106 | assert(s); | |
107 | assert(s->state == SNAPSHOT_ACTIVE); | |
108 | ||
109 | snapshot_set_state(s, SNAPSHOT_DEAD); | |
110 | return 0; | |
5cb5a6ff LP |
111 | } |
112 | ||
87f0e418 | 113 | static UnitActiveState snapshot_active_state(Unit *u) { |
41447faf LP |
114 | assert(u); |
115 | ||
116 | return state_translation_table[SNAPSHOT(u)->state]; | |
117 | } | |
118 | ||
119 | static const char *snapshot_sub_state_to_string(Unit *u) { | |
120 | assert(u); | |
121 | ||
122 | return state_string_table[SNAPSHOT(u)->state]; | |
123 | } | |
124 | ||
125 | int snapshot_create(Manager *m, const char *name, bool cleanup, Snapshot **_s) { | |
126 | Unit *u; | |
127 | char *n = NULL; | |
128 | int r; | |
129 | ||
130 | assert(m); | |
131 | assert(_s); | |
132 | ||
133 | if (name) { | |
134 | if (!unit_name_is_valid(name)) | |
135 | return -EINVAL; | |
136 | ||
137 | if (unit_name_to_type(name) != UNIT_SNAPSHOT) | |
138 | return -EINVAL; | |
139 | ||
140 | if (manager_get_unit(m, name)) | |
141 | return -EEXIST; | |
142 | ||
143 | } else { | |
144 | ||
145 | for (;;) { | |
146 | if (asprintf(&n, "snapshot-%u.snapshot", ++ m->n_snapshots) < 0) | |
147 | return -ENOMEM; | |
148 | ||
149 | if (!manager_get_unit(m, n)) | |
150 | break; | |
151 | ||
152 | free(n); | |
153 | } | |
154 | ||
155 | name = n; | |
156 | } | |
157 | ||
158 | r = manager_load_unit(m, name, NULL, &u); | |
159 | free(n); | |
160 | ||
161 | if (r < 0) | |
162 | return r; | |
163 | ||
164 | SNAPSHOT(u)->cleanup = cleanup; | |
165 | *_s = SNAPSHOT(u); | |
166 | ||
167 | return 0; | |
168 | } | |
169 | ||
170 | void snapshot_remove(Snapshot *s) { | |
171 | assert(s); | |
172 | ||
173 | unit_add_to_cleanup_queue(UNIT(s)); | |
034c6ed7 LP |
174 | } |
175 | ||
87f0e418 | 176 | const UnitVTable snapshot_vtable = { |
5cb5a6ff LP |
177 | .suffix = ".snapshot", |
178 | ||
41447faf LP |
179 | .no_alias = true, |
180 | .no_instances = true, | |
181 | .no_snapshots = true, | |
182 | ||
183 | .load = snapshot_load, | |
184 | ||
185 | .dump = snapshot_dump, | |
186 | ||
187 | .start = snapshot_start, | |
188 | .stop = snapshot_stop, | |
189 | ||
190 | .active_state = snapshot_active_state, | |
191 | .sub_state_to_string = snapshot_sub_state_to_string, | |
5cb5a6ff | 192 | |
41447faf | 193 | .bus_message_handler = bus_snapshot_message_handler |
5cb5a6ff | 194 | }; |