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Systemd/src/login/logind-machine.c

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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2011 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <systemd/sd-messages.h>
#include "util.h"
#include "mkdir.h"
#include "cgroup-util.h"
#include "hashmap.h"
#include "strv.h"
#include "fileio.h"
#include "special.h"
#include "unit-name.h"
#include "dbus-common.h"
#include "logind-machine.h"
Machine* machine_new(Manager *manager, const char *name) {
Machine *m;
assert(manager);
assert(name);
m = new0(Machine, 1);
if (!m)
return NULL;
m->name = strdup(name);
if (!m->name)
goto fail;
m->state_file = strappend("/run/systemd/machines/", m->name);
if (!m->state_file)
goto fail;
if (hashmap_put(manager->machines, m->name, m) < 0)
goto fail;
m->class = _MACHINE_CLASS_INVALID;
m->manager = manager;
return m;
fail:
free(m->state_file);
free(m->name);
free(m);
return NULL;
}
void machine_free(Machine *m) {
assert(m);
if (m->in_gc_queue)
LIST_REMOVE(Machine, gc_queue, m->manager->machine_gc_queue, m);
if (m->scope) {
hashmap_remove(m->manager->machine_units, m->scope);
free(m->scope);
}
free(m->scope_job);
hashmap_remove(m->manager->machines, m->name);
if (m->create_message)
dbus_message_unref(m->create_message);
free(m->name);
free(m->state_file);
free(m->service);
free(m->root_directory);
free(m);
}
int machine_save(Machine *m) {
_cleanup_free_ char *temp_path = NULL;
_cleanup_fclose_ FILE *f = NULL;
int r;
assert(m);
assert(m->state_file);
if (!m->started)
return 0;
r = mkdir_safe_label("/run/systemd/machines", 0755, 0, 0);
if (r < 0)
goto finish;
r = fopen_temporary(m->state_file, &f, &temp_path);
if (r < 0)
goto finish;
fchmod(fileno(f), 0644);
fprintf(f,
"# This is private data. Do not parse.\n"
"NAME=%s\n",
m->name);
if (m->scope)
fprintf(f, "SCOPE=%s\n", m->scope);
if (m->scope_job)
fprintf(f, "SCOPE_JOB=%s\n", m->scope_job);
if (m->service)
fprintf(f, "SERVICE=%s\n", m->service);
if (m->root_directory)
fprintf(f, "ROOT=%s\n", m->root_directory);
if (!sd_id128_equal(m->id, SD_ID128_NULL))
fprintf(f, "ID=" SD_ID128_FORMAT_STR "\n", SD_ID128_FORMAT_VAL(m->id));
if (m->leader != 0)
fprintf(f, "LEADER=%lu\n", (unsigned long) m->leader);
if (m->class != _MACHINE_CLASS_INVALID)
fprintf(f, "CLASS=%s\n", machine_class_to_string(m->class));
if (dual_timestamp_is_set(&m->timestamp))
fprintf(f,
"REALTIME=%llu\n"
"MONOTONIC=%llu\n",
(unsigned long long) m->timestamp.realtime,
(unsigned long long) m->timestamp.monotonic);
fflush(f);
if (ferror(f) || rename(temp_path, m->state_file) < 0) {
r = -errno;
unlink(m->state_file);
unlink(temp_path);
}
finish:
if (r < 0)
log_error("Failed to save machine data for %s: %s", m->name, strerror(-r));
return r;
}
int machine_load(Machine *m) {
_cleanup_free_ char *realtime = NULL, *monotonic = NULL, *id = NULL, *leader = NULL, *class = NULL;
int r;
assert(m);
r = parse_env_file(m->state_file, NEWLINE,
"SCOPE", &m->scope,
"SCOPE_JOB", &m->scope_job,
"SERVICE", &m->service,
"ROOT", &m->root_directory,
"ID", &id,
"LEADER", &leader,
"CLASS", &class,
"REALTIME", &realtime,
"MONOTONIC", &monotonic,
NULL);
if (r < 0) {
if (r == -ENOENT)
return 0;
log_error("Failed to read %s: %s", m->state_file, strerror(-r));
return r;
}
if (id)
sd_id128_from_string(id, &m->id);
if (leader)
parse_pid(leader, &m->leader);
if (class) {
MachineClass c;
c = machine_class_from_string(class);
if (c >= 0)
m->class = c;
}
if (realtime) {
unsigned long long l;
if (sscanf(realtime, "%llu", &l) > 0)
m->timestamp.realtime = l;
}
if (monotonic) {
unsigned long long l;
if (sscanf(monotonic, "%llu", &l) > 0)
m->timestamp.monotonic = l;
}
return r;
}
static int machine_start_scope(Machine *m) {
_cleanup_free_ char *description = NULL;
DBusError error;
char *job;
int r;
assert(m);
dbus_error_init(&error);
if (!m->scope) {
_cleanup_free_ char *escaped = NULL;
escaped = unit_name_escape(m->name);
if (!escaped)
return log_oom();
m->scope = strjoin("machine-", m->name, ".scope", NULL);
if (!m->scope)
return log_oom();
r = hashmap_put(m->manager->machine_units, m->scope, m);
if (r < 0)
log_warning("Failed to create mapping between unit and machine");
}
description = strappend(m->class == MACHINE_VM ? "Virtual Machine " : "Container ", m->name);
r = manager_start_scope(m->manager, m->scope, m->leader, SPECIAL_MACHINE_SLICE, description, &error, &job);
if (r < 0) {
log_error("Failed to start machine scope: %s", bus_error(&error, r));
dbus_error_free(&error);
}
free(m->scope_job);
m->scope_job = job;
return r;
}
int machine_start(Machine *m) {
int r;
assert(m);
if (m->started)
return 0;
/* Create cgroup */
r = machine_start_scope(m);
if (r < 0)
return r;
log_struct(LOG_INFO,
MESSAGE_ID(SD_MESSAGE_MACHINE_START),
"NAME=%s", m->name,
"LEADER=%lu", (unsigned long) m->leader,
"MESSAGE=New machine %s.", m->name,
NULL);
if (!dual_timestamp_is_set(&m->timestamp))
dual_timestamp_get(&m->timestamp);
m->started = true;
/* Save new machine data */
machine_save(m);
machine_send_signal(m, true);
return 0;
}
static int machine_stop_scope(Machine *m) {
DBusError error;
char *job;
int r;
assert(m);
dbus_error_init(&error);
if (!m->scope)
return 0;
r = manager_stop_unit(m->manager, m->scope, &error, &job);
if (r < 0) {
log_error("Failed to stop machine scope: %s", bus_error(&error, r));
dbus_error_free(&error);
return r;
}
free(m->scope_job);
m->scope_job = job;
return r;
}
int machine_stop(Machine *m) {
int r = 0, k;
assert(m);
if (m->started)
log_struct(LOG_INFO,
MESSAGE_ID(SD_MESSAGE_MACHINE_STOP),
"NAME=%s", m->name,
"LEADER=%lu", (unsigned long) m->leader,
"MESSAGE=Machine %s terminated.", m->name,
NULL);
/* Kill cgroup */
k = machine_stop_scope(m);
if (k < 0)
r = k;
unlink(m->state_file);
machine_add_to_gc_queue(m);
if (m->started)
machine_send_signal(m, false);
m->started = false;
return r;
}
int machine_check_gc(Machine *m, bool drop_not_started) {
assert(m);
if (drop_not_started && !m->started)
return 0;
if (m->scope_job)
return 1;
if (m->scope)
return manager_unit_is_active(m->manager, m->scope) != 0;
return 0;
}
void machine_add_to_gc_queue(Machine *m) {
assert(m);
if (m->in_gc_queue)
return;
LIST_PREPEND(Machine, gc_queue, m->manager->machine_gc_queue, m);
m->in_gc_queue = true;
}
MachineState machine_get_state(Machine *s) {
assert(s);
if (s->scope_job)
return s->started ? MACHINE_OPENING : MACHINE_CLOSING;
return MACHINE_RUNNING;
}
int machine_kill(Machine *m, KillWho who, int signo) {
assert(m);
if (!m->scope)
return -ESRCH;
return manager_kill_unit(m->manager, m->scope, who, signo, NULL);
}
static const char* const machine_class_table[_MACHINE_CLASS_MAX] = {
[MACHINE_CONTAINER] = "container",
[MACHINE_VM] = "vm"
};
DEFINE_STRING_TABLE_LOOKUP(machine_class, MachineClass);
static const char* const machine_state_table[_MACHINE_STATE_MAX] = {
[MACHINE_OPENING] = "opening",
[MACHINE_RUNNING] = "running",
[MACHINE_CLOSING] = "closing"
};
DEFINE_STRING_TABLE_LOOKUP(machine_state, MachineState);
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