diff options
Diffstat (limited to 'src/login/logind-machine.c')
| -rw-r--r-- | src/login/logind-machine.c | 455 |
1 files changed, 455 insertions, 0 deletions
diff --git a/src/login/logind-machine.c b/src/login/logind-machine.c new file mode 100644 index 0000000000..347e5aa022 --- /dev/null +++ b/src/login/logind-machine.c @@ -0,0 +1,455 @@ +/*-*- 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); |