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1 : /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
2 :
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 Lesser General Public License as published by
10 : the Free Software Foundation; either version 2.1 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 : Lesser General Public License for more details.
17 :
18 : You should have received a copy of the GNU Lesser General Public License
19 : along with systemd; If not, see <http://www.gnu.org/licenses/>.
20 : ***/
21 :
22 :
23 : #include "unit.h"
24 : #include "target.h"
25 : #include "log.h"
26 : #include "dbus-target.h"
27 : #include "special.h"
28 : #include "unit-name.h"
29 :
30 : static const UnitActiveState state_translation_table[_TARGET_STATE_MAX] = {
31 : [TARGET_DEAD] = UNIT_INACTIVE,
32 : [TARGET_ACTIVE] = UNIT_ACTIVE
33 : };
34 :
35 30 : static void target_set_state(Target *t, TargetState state) {
36 : TargetState old_state;
37 30 : assert(t);
38 :
39 30 : old_state = t->state;
40 30 : t->state = state;
41 :
42 30 : if (state != old_state)
43 30 : log_debug("%s changed %s -> %s",
44 : UNIT(t)->id,
45 : target_state_to_string(old_state),
46 : target_state_to_string(state));
47 :
48 30 : unit_notify(UNIT(t), state_translation_table[old_state], state_translation_table[state], true);
49 30 : }
50 :
51 40 : static int target_add_default_dependencies(Target *t) {
52 :
53 : static const UnitDependency deps[] = {
54 : UNIT_REQUIRES,
55 : UNIT_REQUIRES_OVERRIDABLE,
56 : UNIT_REQUISITE,
57 : UNIT_REQUISITE_OVERRIDABLE,
58 : UNIT_WANTS,
59 : UNIT_BINDS_TO,
60 : UNIT_PART_OF
61 : };
62 :
63 : Iterator i;
64 : Unit *other;
65 : int r;
66 : unsigned k;
67 :
68 40 : assert(t);
69 :
70 : /* Imply ordering for requirement dependencies on target
71 : * units. Note that when the user created a contradicting
72 : * ordering manually we won't add anything in here to make
73 : * sure we don't create a loop. */
74 :
75 320 : for (k = 0; k < ELEMENTSOF(deps); k++)
76 630 : SET_FOREACH(other, UNIT(t)->dependencies[deps[k]], i) {
77 70 : r = unit_add_default_target_dependency(other, UNIT(t));
78 70 : if (r < 0)
79 0 : return r;
80 : }
81 :
82 : /* Make sure targets are unloaded on shutdown */
83 40 : return unit_add_dependency_by_name(UNIT(t), UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, NULL, true);
84 : }
85 :
86 100 : static int target_load(Unit *u) {
87 100 : Target *t = TARGET(u);
88 : int r;
89 :
90 100 : assert(t);
91 :
92 100 : r = unit_load_fragment_and_dropin(u);
93 100 : if (r < 0)
94 40 : return r;
95 :
96 : /* This is a new unit? Then let's add in some extras */
97 60 : if (u->load_state == UNIT_LOADED && u->default_dependencies) {
98 40 : r = target_add_default_dependencies(t);
99 40 : if (r < 0)
100 0 : return r;
101 : }
102 :
103 60 : return 0;
104 : }
105 :
106 10 : static int target_coldplug(Unit *u) {
107 10 : Target *t = TARGET(u);
108 :
109 10 : assert(t);
110 10 : assert(t->state == TARGET_DEAD);
111 :
112 10 : if (t->deserialized_state != t->state)
113 0 : target_set_state(t, t->deserialized_state);
114 :
115 10 : return 0;
116 : }
117 :
118 24 : static void target_dump(Unit *u, FILE *f, const char *prefix) {
119 24 : Target *t = TARGET(u);
120 :
121 24 : assert(t);
122 24 : assert(f);
123 :
124 24 : fprintf(f,
125 : "%sTarget State: %s\n",
126 : prefix, target_state_to_string(t->state));
127 24 : }
128 :
129 30 : static int target_start(Unit *u) {
130 30 : Target *t = TARGET(u);
131 :
132 30 : assert(t);
133 30 : assert(t->state == TARGET_DEAD);
134 :
135 30 : target_set_state(t, TARGET_ACTIVE);
136 30 : return 1;
137 : }
138 :
139 0 : static int target_stop(Unit *u) {
140 0 : Target *t = TARGET(u);
141 :
142 0 : assert(t);
143 0 : assert(t->state == TARGET_ACTIVE);
144 :
145 0 : target_set_state(t, TARGET_DEAD);
146 0 : return 1;
147 : }
148 :
149 0 : static int target_serialize(Unit *u, FILE *f, FDSet *fds) {
150 0 : Target *s = TARGET(u);
151 :
152 0 : assert(s);
153 0 : assert(f);
154 0 : assert(fds);
155 :
156 0 : unit_serialize_item(u, f, "state", target_state_to_string(s->state));
157 0 : return 0;
158 : }
159 :
160 0 : static int target_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) {
161 0 : Target *s = TARGET(u);
162 :
163 0 : assert(u);
164 0 : assert(key);
165 0 : assert(value);
166 0 : assert(fds);
167 :
168 0 : if (streq(key, "state")) {
169 : TargetState state;
170 :
171 0 : state = target_state_from_string(value);
172 0 : if (state < 0)
173 0 : log_debug("Failed to parse state value %s", value);
174 : else
175 0 : s->deserialized_state = state;
176 :
177 : } else
178 0 : log_debug("Unknown serialization key '%s'", key);
179 :
180 0 : return 0;
181 : }
182 :
183 517 : _pure_ static UnitActiveState target_active_state(Unit *u) {
184 517 : assert(u);
185 :
186 517 : return state_translation_table[TARGET(u)->state];
187 : }
188 :
189 0 : _pure_ static const char *target_sub_state_to_string(Unit *u) {
190 0 : assert(u);
191 :
192 0 : return target_state_to_string(TARGET(u)->state);
193 : }
194 :
195 : static const char* const target_state_table[_TARGET_STATE_MAX] = {
196 : [TARGET_DEAD] = "dead",
197 : [TARGET_ACTIVE] = "active"
198 : };
199 :
200 32 : DEFINE_STRING_TABLE_LOOKUP(target_state, TargetState);
201 :
202 : const UnitVTable target_vtable = {
203 : .object_size = sizeof(Target),
204 :
205 : .sections =
206 : "Unit\0"
207 : "Target\0"
208 : "Install\0",
209 :
210 : .load = target_load,
211 : .coldplug = target_coldplug,
212 :
213 : .dump = target_dump,
214 :
215 : .start = target_start,
216 : .stop = target_stop,
217 :
218 : .serialize = target_serialize,
219 : .deserialize_item = target_deserialize_item,
220 :
221 : .active_state = target_active_state,
222 : .sub_state_to_string = target_sub_state_to_string,
223 :
224 : .bus_interface = "org.freedesktop.systemd1.Target",
225 : .bus_vtable = bus_target_vtable,
226 :
227 : .status_message_formats = {
228 : .finished_start_job = {
229 : [JOB_DONE] = "Reached target %s.",
230 : },
231 : .finished_stop_job = {
232 : [JOB_DONE] = "Stopped target %s.",
233 : },
234 : },
235 : };
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