| /*-*- 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 "sd-messages.h" |
| |
| #include "util.h" |
| #include "mkdir.h" |
| #include "hashmap.h" |
| #include "strv.h" |
| #include "fileio.h" |
| #include "special.h" |
| #include "unit-name.h" |
| #include "machine.h" |
| #include "bus-util.h" |
| #include "bus-error.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(gc_queue, m->manager->machine_gc_queue, m); |
| |
| if (m->unit) { |
| hashmap_remove(m->manager->machine_units, m->unit); |
| free(m->unit); |
| } |
| |
| free(m->scope_job); |
| |
| hashmap_remove(m->manager->machines, m->name); |
| |
| if (m->leader > 0) |
| hashmap_remove_value(m->manager->machine_leaders, UINT_TO_PTR(m->leader), m); |
| |
| sd_bus_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->unit) |
| fprintf(f, "SCOPE=%s\n", m->unit); /* We continue to call this "SCOPE=" because it is internal only, and we want to stay compatible with old files */ |
| |
| 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="PID_FMT"\n", 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="USEC_FMT"\n" |
| "MONOTONIC="USEC_FMT"\n", |
| m->timestamp.realtime, |
| m->timestamp.monotonic); |
| |
| fflush(f); |
| |
| if (ferror(f) || rename(temp_path, m->state_file) < 0) { |
| r = -errno; |
| unlink(m->state_file); |
| unlink(temp_path); |
| } |
| |
| if (m->unit) { |
| char *sl; |
| |
| /* Create a symlink from the unit name to the machine |
| * name, so that we can quickly find the machine for |
| * each given unit */ |
| sl = strappenda("/run/systemd/machines/unit:", m->unit); |
| symlink(m->name, sl); |
| } |
| |
| finish: |
| if (r < 0) |
| log_error("Failed to save machine data %s: %s", m->state_file, strerror(-r)); |
| |
| return r; |
| } |
| |
| static void machine_unlink(Machine *m) { |
| assert(m); |
| |
| if (m->unit) { |
| |
| char *sl; |
| |
| sl = strappenda("/run/systemd/machines/unit:", m->unit); |
| unlink(sl); |
| } |
| |
| if (m->state_file) |
| unlink(m->state_file); |
| } |
| |
| 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->unit, |
| "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, sd_bus_message *properties, sd_bus_error *error) { |
| int r = 0; |
| |
| assert(m); |
| |
| if (!m->unit) { |
| _cleanup_free_ char *escaped = NULL; |
| char *scope, *description, *job = NULL; |
| |
| escaped = unit_name_escape(m->name); |
| if (!escaped) |
| return log_oom(); |
| |
| scope = strjoin("machine-", escaped, ".scope", NULL); |
| if (!scope) |
| return log_oom(); |
| |
| description = strappenda(m->class == MACHINE_VM ? "Virtual Machine " : "Container ", m->name); |
| |
| r = manager_start_scope(m->manager, scope, m->leader, SPECIAL_MACHINE_SLICE, description, properties, error, &job); |
| if (r < 0) { |
| log_error("Failed to start machine scope: %s", bus_error_message(error, r)); |
| free(scope); |
| return r; |
| } else { |
| m->unit = scope; |
| |
| free(m->scope_job); |
| m->scope_job = job; |
| } |
| } |
| |
| if (m->unit) |
| hashmap_put(m->manager->machine_units, m->unit, m); |
| |
| return r; |
| } |
| |
| int machine_start(Machine *m, sd_bus_message *properties, sd_bus_error *error) { |
| int r; |
| |
| assert(m); |
| |
| if (m->started) |
| return 0; |
| |
| r = hashmap_put(m->manager->machine_leaders, UINT_TO_PTR(m->leader), m); |
| if (r < 0) |
| return r; |
| |
| /* Create cgroup */ |
| r = machine_start_scope(m, properties, error); |
| 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) { |
| _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; |
| char *job = NULL; |
| int r; |
| |
| assert(m); |
| |
| if (!m->unit) |
| return 0; |
| |
| r = manager_stop_unit(m->manager, m->unit, &error, &job); |
| if (r < 0) { |
| log_error("Failed to stop machine scope: %s", bus_error_message(&error, r)); |
| 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; |
| |
| machine_unlink(m); |
| machine_add_to_gc_queue(m); |
| |
| if (m->started) |
| machine_send_signal(m, false); |
| |
| m->started = false; |
| |
| return r; |
| } |
| |
| bool machine_check_gc(Machine *m, bool drop_not_started) { |
| assert(m); |
| |
| if (drop_not_started && !m->started) |
| return false; |
| |
| if (m->scope_job && manager_job_is_active(m->manager, m->scope_job)) |
| return true; |
| |
| if (m->unit && manager_unit_is_active(m->manager, m->unit)) |
| return true; |
| |
| return false; |
| } |
| |
| void machine_add_to_gc_queue(Machine *m) { |
| assert(m); |
| |
| if (m->in_gc_queue) |
| return; |
| |
| LIST_PREPEND(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->unit) |
| return -ESRCH; |
| |
| if (who == KILL_LEADER) { |
| /* If we shall simply kill the leader, do so directly */ |
| |
| if (kill(m->leader, signo) < 0) |
| return -errno; |
| } |
| |
| /* Otherwise make PID 1 do it for us, for the entire cgroup */ |
| return manager_kill_unit(m->manager, m->unit, 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); |
| |
| static const char* const kill_who_table[_KILL_WHO_MAX] = { |
| [KILL_LEADER] = "leader", |
| [KILL_ALL] = "all" |
| }; |
| |
| DEFINE_STRING_TABLE_LOOKUP(kill_who, KillWho); |