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Diffstat (limited to 'src/machine/machine.c')
| -rw-r--r-- | src/machine/machine.c | 411 |
1 files changed, 411 insertions, 0 deletions
diff --git a/src/machine/machine.c b/src/machine/machine.c new file mode 100644 index 000000000..7d64abe5d --- /dev/null +++ b/src/machine/machine.c @@ -0,0 +1,411 @@ +/*-*- 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 "hashmap.h" +#include "strv.h" +#include "fileio.h" +#include "special.h" +#include "unit-name.h" +#include "dbus-common.h" +#include "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) { + char *escaped = NULL; + + escaped = unit_name_escape(m->name); + if (!escaped) + return log_oom(); + + m->scope = strjoin("machine-", escaped, ".scope", NULL); + free(escaped); + + 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); + } else { + 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); + +static const char* const kill_who_table[_KILL_WHO_MAX] = { + [KILL_LEADER] = "leader", + [KILL_ALL] = "all" +}; + +DEFINE_STRING_TABLE_LOOKUP(kill_who, KillWho); |