summaryrefslogtreecommitdiffstats
path: root/src/machine/machined.c
blob: c3c08d181d600bb6e30a58ce4ec7e436ffd66b96 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
/* SPDX-License-Identifier: LGPL-2.1-or-later */

#include <errno.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>

#include "sd-daemon.h"

#include "alloc-util.h"
#include "bus-error.h"
#include "bus-locator.h"
#include "bus-log-control-api.h"
#include "bus-polkit.h"
#include "cgroup-util.h"
#include "dirent-util.h"
#include "fd-util.h"
#include "format-util.h"
#include "hostname-util.h"
#include "label.h"
#include "machine-image.h"
#include "machined-varlink.h"
#include "machined.h"
#include "main-func.h"
#include "process-util.h"
#include "service-util.h"
#include "signal-util.h"
#include "special.h"

static Manager* manager_unref(Manager *m);
DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_unref);

DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(machine_hash_ops, char, string_hash_func, string_compare_func, Machine, machine_free);

static int manager_new(Manager **ret) {
        _cleanup_(manager_unrefp) Manager *m = NULL;
        int r;

        assert(ret);

        m = new0(Manager, 1);
        if (!m)
                return -ENOMEM;

        m->machines = hashmap_new(&machine_hash_ops);
        m->machine_units = hashmap_new(&string_hash_ops);
        m->machine_leaders = hashmap_new(NULL);

        if (!m->machines || !m->machine_units || !m->machine_leaders)
                return -ENOMEM;

        r = sd_event_default(&m->event);
        if (r < 0)
                return r;

        r = sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL);
        if (r < 0)
                return r;

        r = sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL);
        if (r < 0)
                return r;

        (void) sd_event_set_watchdog(m->event, true);

        *ret = TAKE_PTR(m);
        return 0;
}

static Manager* manager_unref(Manager *m) {
        if (!m)
                return NULL;

        while (m->operations)
                operation_free(m->operations);

        assert(m->n_operations == 0);

        hashmap_free(m->machines); /* This will free all machines, so that the machine_units/machine_leaders is empty */
        hashmap_free(m->machine_units);
        hashmap_free(m->machine_leaders);
        hashmap_free(m->image_cache);

        sd_event_source_unref(m->image_cache_defer_event);
        sd_event_source_unref(m->nscd_cache_flush_event);

        bus_verify_polkit_async_registry_free(m->polkit_registry);

        manager_varlink_done(m);

        sd_bus_flush_close_unref(m->bus);
        sd_event_unref(m->event);

        return mfree(m);
}

static int manager_add_host_machine(Manager *m) {
        _cleanup_free_ char *rd = NULL, *unit = NULL;
        sd_id128_t mid;
        Machine *t;
        int r;

        if (m->host_machine)
                return 0;

        r = sd_id128_get_machine(&mid);
        if (r < 0)
                return log_error_errno(r, "Failed to get machine ID: %m");

        rd = strdup("/");
        if (!rd)
                return log_oom();

        unit = strdup(SPECIAL_ROOT_SLICE);
        if (!unit)
                return log_oom();

        t = machine_new(m, MACHINE_HOST, ".host");
        if (!t)
                return log_oom();

        t->leader = 1;
        t->id = mid;

        t->root_directory = TAKE_PTR(rd);
        t->unit = TAKE_PTR(unit);

        dual_timestamp_from_boottime_or_monotonic(&t->timestamp, 0);

        m->host_machine = t;

        return 0;
}

static int manager_enumerate_machines(Manager *m) {
        _cleanup_closedir_ DIR *d = NULL;
        struct dirent *de;
        int r;

        assert(m);

        r = manager_add_host_machine(m);
        if (r < 0)
                return r;

        /* Read in machine data stored on disk */
        d = opendir("/run/systemd/machines");
        if (!d) {
                if (errno == ENOENT)
                        return 0;

                return log_error_errno(errno, "Failed to open /run/systemd/machines: %m");
        }

        FOREACH_DIRENT(de, d, return -errno) {
                struct Machine *machine;
                int k;

                if (!dirent_is_file(de))
                        continue;

                /* Ignore symlinks that map the unit name to the machine */
                if (startswith(de->d_name, "unit:"))
                        continue;

                if (!machine_name_is_valid(de->d_name))
                        continue;

                k = manager_add_machine(m, de->d_name, &machine);
                if (k < 0) {
                        r = log_error_errno(k, "Failed to add machine by file name %s: %m", de->d_name);
                        continue;
                }

                machine_add_to_gc_queue(machine);

                k = machine_load(machine);
                if (k < 0)
                        r = k;
        }

        return r;
}

static int manager_connect_bus(Manager *m) {
        int r;

        assert(m);
        assert(!m->bus);

        r = sd_bus_default_system(&m->bus);
        if (r < 0)
                return log_error_errno(r, "Failed to connect to system bus: %m");

        r = bus_add_implementation(m->bus, &manager_object, m);
        if (r < 0)
                return r;

        r = bus_match_signal_async(m->bus, NULL, bus_systemd_mgr, "JobRemoved", match_job_removed, NULL, m);
        if (r < 0)
                return log_error_errno(r, "Failed to add match for JobRemoved: %m");

        r = bus_match_signal_async(m->bus, NULL, bus_systemd_mgr, "UnitRemoved", match_unit_removed, NULL, m);
        if (r < 0)
                return log_error_errno(r, "Failed to request match for UnitRemoved: %m");

        r = sd_bus_match_signal_async(
                        m->bus,
                        NULL,
                        "org.freedesktop.systemd1",
                        NULL,
                        "org.freedesktop.DBus.Properties",
                        "PropertiesChanged",
                        match_properties_changed, NULL, m);
        if (r < 0)
                return log_error_errno(r, "Failed to request match for PropertiesChanged: %m");

        r = bus_match_signal_async(m->bus, NULL, bus_systemd_mgr, "Reloading", match_reloading, NULL, m);
        if (r < 0)
                return log_error_errno(r, "Failed to request match for Reloading: %m");

        r = bus_call_method_async(m->bus, NULL, bus_systemd_mgr, "Subscribe", NULL, NULL, NULL);
        if (r < 0)
                return log_error_errno(r, "Failed to enable subscription: %m");

        r = bus_log_control_api_register(m->bus);
        if (r < 0)
                return r;

        r = sd_bus_request_name_async(m->bus, NULL, "org.freedesktop.machine1", 0, NULL, NULL);
        if (r < 0)
                return log_error_errno(r, "Failed to request name: %m");

        r = sd_bus_attach_event(m->bus, m->event, 0);
        if (r < 0)
                return log_error_errno(r, "Failed to attach bus to event loop: %m");

        return 0;
}

static void manager_gc(Manager *m, bool drop_not_started) {
        Machine *machine;

        assert(m);

        while ((machine = m->machine_gc_queue)) {
                LIST_REMOVE(gc_queue, m->machine_gc_queue, machine);
                machine->in_gc_queue = false;

                /* First, if we are not closing yet, initiate stopping */
                if (machine_may_gc(machine, drop_not_started) &&
                    machine_get_state(machine) != MACHINE_CLOSING)
                        machine_stop(machine);

                /* Now, the stop probably made this referenced
                 * again, but if it didn't, then it's time to let it
                 * go entirely. */
                if (machine_may_gc(machine, drop_not_started)) {
                        machine_finalize(machine);
                        machine_free(machine);
                }
        }
}

static int manager_startup(Manager *m) {
        Machine *machine;
        int r;

        assert(m);

        /* Connect to the bus */
        r = manager_connect_bus(m);
        if (r < 0)
                return r;

        /* Set up Varlink service */
        r = manager_varlink_init(m);
        if (r < 0)
                return r;

        /* Deserialize state */
        manager_enumerate_machines(m);

        /* Remove stale objects before we start them */
        manager_gc(m, false);

        /* And start everything */
        HASHMAP_FOREACH(machine, m->machines)
                machine_start(machine, NULL, NULL);

        return 0;
}

static bool check_idle(void *userdata) {
        Manager *m = userdata;

        if (m->operations)
                return false;

        if (varlink_server_current_connections(m->varlink_server) > 0)
                return false;

        manager_gc(m, true);

        return hashmap_isempty(m->machines);
}

static int manager_run(Manager *m) {
        assert(m);

        return bus_event_loop_with_idle(
                        m->event,
                        m->bus,
                        "org.freedesktop.machine1",
                        DEFAULT_EXIT_USEC,
                        check_idle, m);
}

static int run(int argc, char *argv[]) {
        _cleanup_(manager_unrefp) Manager *m = NULL;
        int r;

        log_set_facility(LOG_AUTH);
        log_setup_service();

        r = service_parse_argv("systemd-machined.service",
                               "Manage registrations of local VMs and containers.",
                               BUS_IMPLEMENTATIONS(&manager_object,
                                                   &log_control_object),
                               argc, argv);
        if (r <= 0)
                return r;

        umask(0022);

        /* Always create the directories people can create inotify watches in. Note that some applications might check
         * for the existence of /run/systemd/machines/ to determine whether machined is available, so please always
         * make sure this check stays in. */
        (void) mkdir_label("/run/systemd/machines", 0755);

        assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGCHLD, SIGTERM, SIGINT, -1) >= 0);

        r = manager_new(&m);
        if (r < 0)
                return log_error_errno(r, "Failed to allocate manager object: %m");

        r = manager_startup(m);
        if (r < 0)
                return log_error_errno(r, "Failed to fully start up daemon: %m");

        log_debug("systemd-machined running as pid "PID_FMT, getpid_cached());
        (void) sd_notify(false,
                         "READY=1\n"
                         "STATUS=Processing requests...");

        r = manager_run(m);

        log_debug("systemd-machined stopped as pid "PID_FMT, getpid_cached());
        (void) sd_notify(false,
                         "STOPPING=1\n"
                         "STATUS=Shutting down...");

        return r;
}

DEFINE_MAIN_FUNCTION(run);