--- /dev/null
+/*-*- 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 "logind-machine.h"
+#include "util.h"
+#include "mkdir.h"
+#include "cgroup-util.h"
+#include "hashmap.h"
+#include "strv.h"
+#include "fileio.h"
+#include "special.h"
+#include <systemd/sd-messages.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->cgroup_path) {
+ hashmap_remove(m->manager->machine_cgroups, m->cgroup_path);
+ free(m->cgroup_path);
+ }
+
+ hashmap_remove(m->manager->machines, m->name);
+
+ free(m->name);
+ free(m->state_file);
+ free(m->service);
+ free(m->slice);
+ 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->cgroup_path)
+ fprintf(f, "CGROUP=%s\n", m->cgroup_path);
+
+ if (m->service)
+ fprintf(f, "SERVICE=%s\n", m->service);
+
+ if (m->slice)
+ fprintf(f, "SLICE=%s\n", m->slice);
+
+ 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,
+ "CGROUP", &m->cgroup_path,
+ "SERVICE", &m->service,
+ "SLICE", &m->slice,
+ "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_create_one_group(Machine *m, const char *controller, const char *path) {
+ int r;
+
+ assert(m);
+ assert(path);
+
+ if (m->leader > 0)
+ r = cg_create_and_attach(controller, path, m->leader);
+ else
+ r = -EINVAL;
+
+ if (r < 0) {
+ r = cg_create(controller, path, NULL);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+static int machine_create_cgroup(Machine *m) {
+ char **k;
+ int r;
+
+ assert(m);
+
+ if (!m->slice) {
+ m->slice = strdup(SPECIAL_MACHINE_SLICE);
+ if (!m->slice)
+ return log_oom();
+ }
+
+ if (!m->cgroup_path) {
+ _cleanup_free_ char *escaped = NULL, *slice = NULL;
+ char *name;
+
+ name = strappenda(m->name, ".machine");
+
+ escaped = cg_escape(name);
+ if (!escaped)
+ return log_oom();
+
+ r = cg_slice_to_path(m->slice, &slice);
+ if (r < 0)
+ return r;
+
+ m->cgroup_path = strjoin(m->manager->cgroup_root, "/", slice, "/", escaped, NULL);
+ if (!m->cgroup_path)
+ return log_oom();
+ }
+
+ r = machine_create_one_group(m, SYSTEMD_CGROUP_CONTROLLER, m->cgroup_path);
+ if (r < 0) {
+ log_error("Failed to create cgroup "SYSTEMD_CGROUP_CONTROLLER":%s: %s", m->cgroup_path, strerror(-r));
+ return r;
+ }
+
+ STRV_FOREACH(k, m->manager->controllers) {
+
+ if (strv_contains(m->manager->reset_controllers, *k))
+ continue;
+
+ r = machine_create_one_group(m, *k, m->cgroup_path);
+ if (r < 0)
+ log_warning("Failed to create cgroup %s:%s: %s", *k, m->cgroup_path, strerror(-r));
+ }
+
+ if (m->leader > 0) {
+ STRV_FOREACH(k, m->manager->reset_controllers) {
+ r = cg_attach(*k, "/", m->leader);
+ if (r < 0)
+ log_warning("Failed to reset controller %s: %s", *k, strerror(-r));
+ }
+ }
+
+ r = hashmap_put(m->manager->machine_cgroups, m->cgroup_path, m);
+ if (r < 0)
+ log_warning("Failed to create mapping between cgroup and machine");
+
+ return 0;
+}
+
+int machine_start(Machine *m) {
+ int r;
+
+ assert(m);
+
+ if (m->started)
+ return 0;
+
+ 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);
+
+ /* Create cgroup */
+ r = machine_create_cgroup(m);
+ if (r < 0)
+ return r;
+
+ 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_terminate_cgroup(Machine *m) {
+ int r;
+ char **k;
+
+ assert(m);
+
+ if (!m->cgroup_path)
+ return 0;
+
+ cg_trim(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_path, false);
+
+ r = cg_kill_recursive_and_wait(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_path, true);
+ if (r < 0)
+ log_error("Failed to kill machine cgroup: %s", strerror(-r));
+
+ STRV_FOREACH(k, m->manager->controllers)
+ cg_trim(*k, m->cgroup_path, true);
+
+ hashmap_remove(m->manager->machine_cgroups, m->cgroup_path);
+
+ free(m->cgroup_path);
+ m->cgroup_path = NULL;
+
+ 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_terminate_cgroup(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) {
+ int r;
+
+ assert(m);
+
+ if (drop_not_started && !m->started)
+ return 0;
+
+ if (m->cgroup_path) {
+ r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_path, false);
+ if (r < 0)
+ return r;
+
+ if (r <= 0)
+ return 1;
+ }
+
+ 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;
+}
+
+int machine_kill(Machine *m, KillWho who, int signo) {
+ _cleanup_set_free_ Set *pid_set = NULL;
+ int r = 0;
+
+ assert(m);
+
+ if (!m->cgroup_path)
+ return -ESRCH;
+
+ if (m->leader <= 0 && who == KILL_LEADER)
+ return -ESRCH;
+
+ if (m->leader > 0)
+ if (kill(m->leader, signo) < 0)
+ r = -errno;
+
+ if (who == KILL_ALL) {
+ int q;
+
+ pid_set = set_new(trivial_hash_func, trivial_compare_func);
+ if (!pid_set)
+ return log_oom();
+
+ if (m->leader > 0) {
+ q = set_put(pid_set, LONG_TO_PTR(m->leader));
+ if (q < 0)
+ r = q;
+ }
+
+ q = cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_path, signo, false, true, false, pid_set);
+ if (q < 0 && (q != -EAGAIN && q != -ESRCH && q != -ENOENT))
+ r = q;
+ }
+
+ return r;
+}
+
+static const char* const machine_class_table[_MACHINE_CLASS_MAX] = {
+ [MACHINE_CONTAINER] = "container",
+ [MACHINE_VM] = "vm"
+};
+
+DEFINE_STRING_TABLE_LOOKUP(machine_class, MachineClass);
~ianmdlvl / elogind.git / blobdiff