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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
a7334b09 | 2 | |
4139c1b2 | 3 | #include "dbus-target.h" |
6fcbec6f | 4 | #include "dbus-unit.h" |
07630cea | 5 | #include "log.h" |
d68c645b | 6 | #include "serialize.h" |
514f4ef5 | 7 | #include "special.h" |
07630cea | 8 | #include "string-util.h" |
d68c645b | 9 | #include "target.h" |
b2bb3dbe | 10 | #include "unit-name.h" |
07630cea | 11 | #include "unit.h" |
c22cbe26 | 12 | |
fa068367 LP |
13 | static const UnitActiveState state_translation_table[_TARGET_STATE_MAX] = { |
14 | [TARGET_DEAD] = UNIT_INACTIVE, | |
15 | [TARGET_ACTIVE] = UNIT_ACTIVE | |
16 | }; | |
17 | ||
fa068367 LP |
18 | static void target_set_state(Target *t, TargetState state) { |
19 | TargetState old_state; | |
20 | assert(t); | |
21 | ||
6fcbec6f LP |
22 | if (t->state != state) |
23 | bus_unit_send_pending_change_signal(UNIT(t), false); | |
24 | ||
fa068367 LP |
25 | old_state = t->state; |
26 | t->state = state; | |
27 | ||
e537352b | 28 | if (state != old_state) |
40d50879 | 29 | log_debug("%s changed %s -> %s", |
1124fe6f | 30 | UNIT(t)->id, |
a16e1123 LP |
31 | target_state_to_string(old_state), |
32 | target_state_to_string(state)); | |
c22cbe26 | 33 | |
96b09de5 | 34 | unit_notify(UNIT(t), state_translation_table[old_state], state_translation_table[state], /* reload_success = */ true); |
fa068367 LP |
35 | } |
36 | ||
a40eb732 | 37 | static int target_add_default_dependencies(Target *t) { |
15ed3c3a LP |
38 | _cleanup_free_ Unit **others = NULL; |
39 | int r, n_others; | |
bba34eed | 40 | |
98bc2000 | 41 | assert(t); |
a40eb732 | 42 | |
41c237af IP |
43 | if (!UNIT(t)->default_dependencies) |
44 | return 0; | |
45 | ||
15ed3c3a LP |
46 | /* Imply ordering for requirement dependencies on target units. Note that when the user created a |
47 | * contradicting ordering manually we won't add anything in here to make sure we don't create a | |
48 | * loop. | |
49 | * | |
50 | * Note that quite likely iterating through these dependencies will add new dependencies, which | |
51 | * conflicts with the hashmap-based iteration logic. Hence, instead of iterating through the | |
52 | * dependencies and acting on them as we go, first take an "atomic snapshot" of sorts and iterate | |
53 | * through that. */ | |
54 | ||
55 | n_others = unit_get_dependency_array(UNIT(t), UNIT_ATOM_ADD_DEFAULT_TARGET_DEPENDENCY_QUEUE, &others); | |
56 | if (n_others < 0) | |
57 | return n_others; | |
58 | ||
59 | for (int i = 0; i < n_others; i++) { | |
60 | r = unit_add_default_target_dependency(others[i], UNIT(t)); | |
61 | if (r < 0) | |
62 | return r; | |
eef85c4a | 63 | } |
bba34eed | 64 | |
33e28180 LP |
65 | if (unit_has_name(UNIT(t), SPECIAL_SHUTDOWN_TARGET)) |
66 | return 0; | |
67 | ||
b401e1fb | 68 | /* Make sure targets are unloaded on shutdown */ |
3835b9aa | 69 | return unit_add_two_dependencies_by_name(UNIT(t), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, true, UNIT_DEPENDENCY_DEFAULT); |
a40eb732 LP |
70 | } |
71 | ||
72 | static int target_load(Unit *u) { | |
e9fa1bf7 | 73 | Target *t = ASSERT_PTR(TARGET(u)); |
a40eb732 LP |
74 | int r; |
75 | ||
c3620770 | 76 | r = unit_load_fragment_and_dropin(u, true); |
1850161f | 77 | if (r < 0) |
a40eb732 LP |
78 | return r; |
79 | ||
75193d41 ZJS |
80 | if (u->load_state != UNIT_LOADED) |
81 | return 0; | |
a40eb732 | 82 | |
75193d41 ZJS |
83 | /* This is a new unit? Then let's add in some extras */ |
84 | return target_add_default_dependencies(t); | |
a40eb732 LP |
85 | } |
86 | ||
be847e82 | 87 | static int target_coldplug(Unit *u) { |
e9fa1bf7 | 88 | Target *t = ASSERT_PTR(TARGET(u)); |
a16e1123 | 89 | |
a16e1123 LP |
90 | assert(t->state == TARGET_DEAD); |
91 | ||
92 | if (t->deserialized_state != t->state) | |
93 | target_set_state(t, t->deserialized_state); | |
94 | ||
95 | return 0; | |
96 | } | |
97 | ||
98 | static void target_dump(Unit *u, FILE *f, const char *prefix) { | |
e9fa1bf7 | 99 | Target *t = ASSERT_PTR(TARGET(u)); |
a16e1123 | 100 | |
a16e1123 | 101 | assert(f); |
e9fa1bf7 | 102 | assert(prefix); |
a16e1123 LP |
103 | |
104 | fprintf(f, | |
105 | "%sTarget State: %s\n", | |
106 | prefix, target_state_to_string(t->state)); | |
107 | } | |
108 | ||
fa068367 | 109 | static int target_start(Unit *u) { |
e9fa1bf7 | 110 | Target *t = ASSERT_PTR(TARGET(u)); |
4b58153d | 111 | int r; |
fa068367 | 112 | |
fa068367 LP |
113 | assert(t->state == TARGET_DEAD); |
114 | ||
4b58153d LP |
115 | r = unit_acquire_invocation_id(u); |
116 | if (r < 0) | |
117 | return r; | |
118 | ||
fa068367 | 119 | target_set_state(t, TARGET_ACTIVE); |
82a2b6bb | 120 | return 1; |
fa068367 | 121 | } |
c22cbe26 | 122 | |
fa068367 | 123 | static int target_stop(Unit *u) { |
e9fa1bf7 | 124 | Target *t = ASSERT_PTR(TARGET(u)); |
fa068367 | 125 | |
fa068367 LP |
126 | assert(t->state == TARGET_ACTIVE); |
127 | ||
128 | target_set_state(t, TARGET_DEAD); | |
82a2b6bb | 129 | return 1; |
c22cbe26 LP |
130 | } |
131 | ||
a16e1123 | 132 | static int target_serialize(Unit *u, FILE *f, FDSet *fds) { |
e9fa1bf7 | 133 | Target *t = ASSERT_PTR(TARGET(u)); |
a16e1123 | 134 | |
a16e1123 LP |
135 | assert(f); |
136 | assert(fds); | |
137 | ||
e9fa1bf7 | 138 | (void) serialize_item(f, "state", target_state_to_string(t->state)); |
a16e1123 LP |
139 | return 0; |
140 | } | |
141 | ||
142 | static int target_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { | |
e9fa1bf7 | 143 | Target *t = ASSERT_PTR(TARGET(u)); |
a16e1123 | 144 | |
a16e1123 LP |
145 | assert(key); |
146 | assert(value); | |
147 | assert(fds); | |
148 | ||
149 | if (streq(key, "state")) { | |
150 | TargetState state; | |
151 | ||
1850161f LP |
152 | state = target_state_from_string(value); |
153 | if (state < 0) | |
e9fa1bf7 | 154 | log_unit_debug(u, "Failed to parse state: %s", value); |
a16e1123 | 155 | else |
e9fa1bf7 | 156 | t->deserialized_state = state; |
a16e1123 LP |
157 | |
158 | } else | |
e9fa1bf7 | 159 | log_unit_debug(u, "Unknown serialization key: %s", key); |
a16e1123 LP |
160 | |
161 | return 0; | |
162 | } | |
163 | ||
d1e8e8b5 | 164 | static UnitActiveState target_active_state(Unit *u) { |
e9fa1bf7 | 165 | Target *t = ASSERT_PTR(TARGET(u)); |
fa068367 | 166 | |
e9fa1bf7 | 167 | return state_translation_table[t->state]; |
c22cbe26 LP |
168 | } |
169 | ||
d1e8e8b5 | 170 | static const char *target_sub_state_to_string(Unit *u) { |
e9fa1bf7 | 171 | Target *t = ASSERT_PTR(TARGET(u)); |
10a94420 | 172 | |
e9fa1bf7 | 173 | return target_state_to_string(t->state); |
10a94420 LP |
174 | } |
175 | ||
87f0e418 | 176 | const UnitVTable target_vtable = { |
7d17cfbc | 177 | .object_size = sizeof(Target), |
718db961 | 178 | |
f975e971 LP |
179 | .sections = |
180 | "Unit\0" | |
181 | "Target\0" | |
182 | "Install\0", | |
c22cbe26 | 183 | |
94d1ddbd ZJS |
184 | .can_fail = true, |
185 | ||
a40eb732 | 186 | .load = target_load, |
a16e1123 | 187 | .coldplug = target_coldplug, |
fa068367 LP |
188 | |
189 | .dump = target_dump, | |
190 | ||
191 | .start = target_start, | |
192 | .stop = target_stop, | |
c22cbe26 | 193 | |
a16e1123 LP |
194 | .serialize = target_serialize, |
195 | .deserialize_item = target_deserialize_item, | |
196 | ||
10a94420 | 197 | .active_state = target_active_state, |
4139c1b2 LP |
198 | .sub_state_to_string = target_sub_state_to_string, |
199 | ||
c6918296 MS |
200 | .status_message_formats = { |
201 | .finished_start_job = { | |
202 | [JOB_DONE] = "Reached target %s.", | |
c6918296 MS |
203 | }, |
204 | .finished_stop_job = { | |
205 | [JOB_DONE] = "Stopped target %s.", | |
206 | }, | |
207 | }, | |
b2d6bb5b LP |
208 | |
209 | .notify_supervisor = true, | |
c22cbe26 | 210 | }; |