4751364e76
Let's natively support our own API in machined too. This allows us to remove half of nss-mymachines in a later commit.
369 lines
11 KiB
C
369 lines
11 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <errno.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "sd-daemon.h"
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#include "alloc-util.h"
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#include "bus-error.h"
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#include "bus-locator.h"
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#include "bus-log-control-api.h"
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#include "bus-polkit.h"
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#include "cgroup-util.h"
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#include "dirent-util.h"
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#include "fd-util.h"
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#include "format-util.h"
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#include "hostname-util.h"
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#include "label.h"
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#include "machine-image.h"
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#include "machined-varlink.h"
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#include "machined.h"
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#include "main-func.h"
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#include "process-util.h"
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#include "service-util.h"
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#include "signal-util.h"
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#include "special.h"
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static Manager* manager_unref(Manager *m);
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DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_unref);
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DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(machine_hash_ops, char, string_hash_func, string_compare_func, Machine, machine_free);
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static int manager_new(Manager **ret) {
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_cleanup_(manager_unrefp) Manager *m = NULL;
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int r;
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assert(ret);
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m = new0(Manager, 1);
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if (!m)
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return -ENOMEM;
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m->machines = hashmap_new(&machine_hash_ops);
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m->machine_units = hashmap_new(&string_hash_ops);
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m->machine_leaders = hashmap_new(NULL);
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if (!m->machines || !m->machine_units || !m->machine_leaders)
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return -ENOMEM;
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r = sd_event_default(&m->event);
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if (r < 0)
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return r;
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r = sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL);
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if (r < 0)
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return r;
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r = sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL);
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if (r < 0)
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return r;
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(void) sd_event_set_watchdog(m->event, true);
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*ret = TAKE_PTR(m);
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return 0;
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}
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static Manager* manager_unref(Manager *m) {
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if (!m)
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return NULL;
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while (m->operations)
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operation_free(m->operations);
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assert(m->n_operations == 0);
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hashmap_free(m->machines); /* This will free all machines, so that the machine_units/machine_leaders is empty */
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hashmap_free(m->machine_units);
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hashmap_free(m->machine_leaders);
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hashmap_free(m->image_cache);
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sd_event_source_unref(m->image_cache_defer_event);
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sd_event_source_unref(m->nscd_cache_flush_event);
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bus_verify_polkit_async_registry_free(m->polkit_registry);
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manager_varlink_done(m);
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sd_bus_flush_close_unref(m->bus);
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sd_event_unref(m->event);
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return mfree(m);
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}
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static int manager_add_host_machine(Manager *m) {
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_cleanup_free_ char *rd = NULL, *unit = NULL;
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sd_id128_t mid;
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Machine *t;
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int r;
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if (m->host_machine)
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return 0;
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r = sd_id128_get_machine(&mid);
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if (r < 0)
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return log_error_errno(r, "Failed to get machine ID: %m");
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rd = strdup("/");
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if (!rd)
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return log_oom();
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unit = strdup(SPECIAL_ROOT_SLICE);
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if (!unit)
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return log_oom();
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t = machine_new(m, MACHINE_HOST, ".host");
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if (!t)
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return log_oom();
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t->leader = 1;
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t->id = mid;
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t->root_directory = TAKE_PTR(rd);
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t->unit = TAKE_PTR(unit);
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dual_timestamp_from_boottime_or_monotonic(&t->timestamp, 0);
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m->host_machine = t;
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return 0;
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}
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static int manager_enumerate_machines(Manager *m) {
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_cleanup_closedir_ DIR *d = NULL;
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struct dirent *de;
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int r = 0;
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assert(m);
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r = manager_add_host_machine(m);
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if (r < 0)
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return r;
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/* Read in machine data stored on disk */
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d = opendir("/run/systemd/machines");
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if (!d) {
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if (errno == ENOENT)
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return 0;
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return log_error_errno(errno, "Failed to open /run/systemd/machines: %m");
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}
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FOREACH_DIRENT(de, d, return -errno) {
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struct Machine *machine;
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int k;
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if (!dirent_is_file(de))
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continue;
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/* Ignore symlinks that map the unit name to the machine */
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if (startswith(de->d_name, "unit:"))
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continue;
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if (!machine_name_is_valid(de->d_name))
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continue;
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k = manager_add_machine(m, de->d_name, &machine);
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if (k < 0) {
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r = log_error_errno(k, "Failed to add machine by file name %s: %m", de->d_name);
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continue;
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}
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machine_add_to_gc_queue(machine);
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k = machine_load(machine);
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if (k < 0)
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r = k;
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}
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return r;
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}
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static int manager_connect_bus(Manager *m) {
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int r;
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assert(m);
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assert(!m->bus);
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r = sd_bus_default_system(&m->bus);
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if (r < 0)
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return log_error_errno(r, "Failed to connect to system bus: %m");
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r = bus_add_implementation(m->bus, &manager_object, m);
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if (r < 0)
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return r;
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r = bus_match_signal_async(m->bus, NULL, bus_systemd_mgr, "JobRemoved", match_job_removed, NULL, m);
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if (r < 0)
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return log_error_errno(r, "Failed to add match for JobRemoved: %m");
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r = bus_match_signal_async(m->bus, NULL, bus_systemd_mgr, "UnitRemoved", match_unit_removed, NULL, m);
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if (r < 0)
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return log_error_errno(r, "Failed to request match for UnitRemoved: %m");
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r = sd_bus_match_signal_async(
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m->bus,
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NULL,
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"org.freedesktop.systemd1",
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NULL,
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"org.freedesktop.DBus.Properties",
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"PropertiesChanged",
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match_properties_changed, NULL, m);
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if (r < 0)
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return log_error_errno(r, "Failed to request match for PropertiesChanged: %m");
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r = bus_match_signal_async(m->bus, NULL, bus_systemd_mgr, "Reloading", match_reloading, NULL, m);
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if (r < 0)
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return log_error_errno(r, "Failed to request match for Reloading: %m");
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r = bus_call_method_async(m->bus, NULL, bus_systemd_mgr, "Subscribe", NULL, NULL, NULL);
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if (r < 0)
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return log_error_errno(r, "Failed to enable subscription: %m");
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r = bus_log_control_api_register(m->bus);
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if (r < 0)
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return r;
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r = sd_bus_request_name_async(m->bus, NULL, "org.freedesktop.machine1", 0, NULL, NULL);
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if (r < 0)
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return log_error_errno(r, "Failed to request name: %m");
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r = sd_bus_attach_event(m->bus, m->event, 0);
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if (r < 0)
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return log_error_errno(r, "Failed to attach bus to event loop: %m");
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return 0;
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}
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static void manager_gc(Manager *m, bool drop_not_started) {
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Machine *machine;
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assert(m);
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while ((machine = m->machine_gc_queue)) {
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LIST_REMOVE(gc_queue, m->machine_gc_queue, machine);
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machine->in_gc_queue = false;
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/* First, if we are not closing yet, initiate stopping */
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if (machine_may_gc(machine, drop_not_started) &&
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machine_get_state(machine) != MACHINE_CLOSING)
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machine_stop(machine);
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/* Now, the stop probably made this referenced
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* again, but if it didn't, then it's time to let it
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* go entirely. */
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if (machine_may_gc(machine, drop_not_started)) {
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machine_finalize(machine);
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machine_free(machine);
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}
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}
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}
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static int manager_startup(Manager *m) {
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Machine *machine;
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Iterator i;
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int r;
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assert(m);
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/* Connect to the bus */
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r = manager_connect_bus(m);
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if (r < 0)
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return r;
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/* Set up Varlink service */
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r = manager_varlink_init(m);
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if (r < 0)
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return r;
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/* Deserialize state */
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manager_enumerate_machines(m);
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/* Remove stale objects before we start them */
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manager_gc(m, false);
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/* And start everything */
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HASHMAP_FOREACH(machine, m->machines, i)
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machine_start(machine, NULL, NULL);
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return 0;
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}
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static bool check_idle(void *userdata) {
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Manager *m = userdata;
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if (m->operations)
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return false;
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if (varlink_server_current_connections(m->varlink_server) > 0)
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return false;
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manager_gc(m, true);
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return hashmap_isempty(m->machines);
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}
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static int manager_run(Manager *m) {
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assert(m);
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return bus_event_loop_with_idle(
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m->event,
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m->bus,
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"org.freedesktop.machine1",
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DEFAULT_EXIT_USEC,
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check_idle, m);
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}
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static int run(int argc, char *argv[]) {
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_cleanup_(manager_unrefp) Manager *m = NULL;
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int r;
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log_set_facility(LOG_AUTH);
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log_setup_service();
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r = service_parse_argv("systemd-machined.service",
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"Manage registrations of local VMs and containers.",
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BUS_IMPLEMENTATIONS(&manager_object,
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&log_control_object),
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argc, argv);
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if (r <= 0)
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return r;
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umask(0022);
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/* Always create the directories people can create inotify watches in. Note that some applications might check
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* for the existence of /run/systemd/machines/ to determine whether machined is available, so please always
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* make sure this check stays in. */
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(void) mkdir_label("/run/systemd/machines", 0755);
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assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGCHLD, SIGTERM, SIGINT, -1) >= 0);
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r = manager_new(&m);
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if (r < 0)
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return log_error_errno(r, "Failed to allocate manager object: %m");
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r = manager_startup(m);
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if (r < 0)
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return log_error_errno(r, "Failed to fully start up daemon: %m");
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log_debug("systemd-machined running as pid "PID_FMT, getpid_cached());
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(void) sd_notify(false,
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"READY=1\n"
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"STATUS=Processing requests...");
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r = manager_run(m);
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log_debug("systemd-machined stopped as pid "PID_FMT, getpid_cached());
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(void) sd_notify(false,
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"STOPPING=1\n"
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"STATUS=Shutting down...");
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return r;
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}
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DEFINE_MAIN_FUNCTION(run);
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