628 lines
16 KiB
C
628 lines
16 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2011 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include "sd-messages.h"
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#include "util.h"
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#include "mkdir.h"
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#include "hashmap.h"
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#include "fileio.h"
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#include "special.h"
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#include "unit-name.h"
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#include "bus-util.h"
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#include "bus-error.h"
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#include "machine.h"
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#include "machine-dbus.h"
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#include "formats-util.h"
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Machine* machine_new(Manager *manager, MachineClass class, const char *name) {
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Machine *m;
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assert(manager);
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assert(class < _MACHINE_CLASS_MAX);
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assert(name);
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/* Passing class == _MACHINE_CLASS_INVALID here is fine. It
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* means as much as "we don't know yet", and that we'll figure
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* it out later when loading the state file. */
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m = new0(Machine, 1);
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if (!m)
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return NULL;
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m->name = strdup(name);
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if (!m->name)
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goto fail;
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if (class != MACHINE_HOST) {
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m->state_file = strappend("/run/systemd/machines/", m->name);
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if (!m->state_file)
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goto fail;
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}
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m->class = class;
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if (hashmap_put(manager->machines, m->name, m) < 0)
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goto fail;
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m->manager = manager;
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return m;
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fail:
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free(m->state_file);
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free(m->name);
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free(m);
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return NULL;
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}
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void machine_free(Machine *m) {
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assert(m);
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while (m->operations)
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machine_operation_unref(m->operations);
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if (m->in_gc_queue)
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LIST_REMOVE(gc_queue, m->manager->machine_gc_queue, m);
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machine_release_unit(m);
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free(m->scope_job);
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(void) hashmap_remove(m->manager->machines, m->name);
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if (m->manager->host_machine == m)
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m->manager->host_machine = NULL;
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if (m->leader > 0)
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(void) hashmap_remove_value(m->manager->machine_leaders, UINT_TO_PTR(m->leader), m);
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sd_bus_message_unref(m->create_message);
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free(m->name);
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free(m->state_file);
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free(m->service);
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free(m->root_directory);
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free(m->netif);
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free(m);
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}
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int machine_save(Machine *m) {
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_cleanup_free_ char *temp_path = NULL;
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_cleanup_fclose_ FILE *f = NULL;
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int r;
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assert(m);
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if (!m->state_file)
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return 0;
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if (!m->started)
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return 0;
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r = mkdir_safe_label("/run/systemd/machines", 0755, 0, 0);
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if (r < 0)
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goto fail;
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r = fopen_temporary(m->state_file, &f, &temp_path);
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if (r < 0)
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goto fail;
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(void) fchmod(fileno(f), 0644);
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fprintf(f,
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"# This is private data. Do not parse.\n"
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"NAME=%s\n",
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m->name);
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if (m->unit) {
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_cleanup_free_ char *escaped;
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escaped = cescape(m->unit);
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if (!escaped) {
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r = -ENOMEM;
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goto fail;
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}
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fprintf(f, "SCOPE=%s\n", escaped); /* We continue to call this "SCOPE=" because it is internal only, and we want to stay compatible with old files */
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}
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if (m->scope_job)
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fprintf(f, "SCOPE_JOB=%s\n", m->scope_job);
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if (m->service) {
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_cleanup_free_ char *escaped;
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escaped = cescape(m->service);
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if (!escaped) {
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r = -ENOMEM;
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goto fail;
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}
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fprintf(f, "SERVICE=%s\n", escaped);
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}
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if (m->root_directory) {
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_cleanup_free_ char *escaped;
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escaped = cescape(m->root_directory);
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if (!escaped) {
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r = -ENOMEM;
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goto fail;
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}
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fprintf(f, "ROOT=%s\n", escaped);
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}
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if (!sd_id128_equal(m->id, SD_ID128_NULL))
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fprintf(f, "ID=" SD_ID128_FORMAT_STR "\n", SD_ID128_FORMAT_VAL(m->id));
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if (m->leader != 0)
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fprintf(f, "LEADER="PID_FMT"\n", m->leader);
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if (m->class != _MACHINE_CLASS_INVALID)
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fprintf(f, "CLASS=%s\n", machine_class_to_string(m->class));
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if (dual_timestamp_is_set(&m->timestamp))
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fprintf(f,
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"REALTIME="USEC_FMT"\n"
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"MONOTONIC="USEC_FMT"\n",
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m->timestamp.realtime,
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m->timestamp.monotonic);
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if (m->n_netif > 0) {
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unsigned i;
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fputs("NETIF=", f);
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for (i = 0; i < m->n_netif; i++) {
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if (i != 0)
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fputc(' ', f);
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fprintf(f, "%i", m->netif[i]);
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}
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fputc('\n', f);
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}
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r = fflush_and_check(f);
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if (r < 0)
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goto fail;
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if (rename(temp_path, m->state_file) < 0) {
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r = -errno;
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goto fail;
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}
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if (m->unit) {
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char *sl;
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/* Create a symlink from the unit name to the machine
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* name, so that we can quickly find the machine for
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* each given unit. Ignore error. */
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sl = strjoina("/run/systemd/machines/unit:", m->unit);
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(void) symlink(m->name, sl);
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}
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return 0;
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fail:
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(void) unlink(m->state_file);
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if (temp_path)
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(void) unlink(temp_path);
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return log_error_errno(r, "Failed to save machine data %s: %m", m->state_file);
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}
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static void machine_unlink(Machine *m) {
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assert(m);
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if (m->unit) {
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char *sl;
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sl = strjoina("/run/systemd/machines/unit:", m->unit);
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(void) unlink(sl);
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}
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if (m->state_file)
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(void) unlink(m->state_file);
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}
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int machine_load(Machine *m) {
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_cleanup_free_ char *realtime = NULL, *monotonic = NULL, *id = NULL, *leader = NULL, *class = NULL, *netif = NULL;
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int r;
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assert(m);
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if (!m->state_file)
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return 0;
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r = parse_env_file(m->state_file, NEWLINE,
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"SCOPE", &m->unit,
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"SCOPE_JOB", &m->scope_job,
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"SERVICE", &m->service,
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"ROOT", &m->root_directory,
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"ID", &id,
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"LEADER", &leader,
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"CLASS", &class,
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"REALTIME", &realtime,
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"MONOTONIC", &monotonic,
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"NETIF", &netif,
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NULL);
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if (r < 0) {
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if (r == -ENOENT)
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return 0;
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return log_error_errno(r, "Failed to read %s: %m", m->state_file);
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}
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if (id)
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sd_id128_from_string(id, &m->id);
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if (leader)
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parse_pid(leader, &m->leader);
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if (class) {
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MachineClass c;
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c = machine_class_from_string(class);
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if (c >= 0)
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m->class = c;
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}
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if (realtime) {
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unsigned long long l;
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if (sscanf(realtime, "%llu", &l) > 0)
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m->timestamp.realtime = l;
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}
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if (monotonic) {
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unsigned long long l;
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if (sscanf(monotonic, "%llu", &l) > 0)
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m->timestamp.monotonic = l;
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}
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if (netif) {
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size_t l, allocated = 0, nr = 0;
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const char *word, *state;
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int *ni = NULL;
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FOREACH_WORD(word, l, netif, state) {
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char buf[l+1];
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int ifi;
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*(char*) (mempcpy(buf, word, l)) = 0;
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if (safe_atoi(buf, &ifi) < 0)
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continue;
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if (ifi <= 0)
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continue;
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if (!GREEDY_REALLOC(ni, allocated, nr+1)) {
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free(ni);
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return log_oom();
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}
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ni[nr++] = ifi;
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}
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free(m->netif);
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m->netif = ni;
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m->n_netif = nr;
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}
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return r;
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}
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static int machine_start_scope(Machine *m, sd_bus_message *properties, sd_bus_error *error) {
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int r = 0;
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assert(m);
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assert(m->class != MACHINE_HOST);
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if (!m->unit) {
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_cleanup_free_ char *escaped = NULL;
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char *scope, *description, *job = NULL;
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escaped = unit_name_escape(m->name);
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if (!escaped)
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return log_oom();
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scope = strjoin("machine-", escaped, ".scope", NULL);
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if (!scope)
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return log_oom();
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description = strjoina(m->class == MACHINE_VM ? "Virtual Machine " : "Container ", m->name);
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r = manager_start_scope(m->manager, scope, m->leader, SPECIAL_MACHINE_SLICE, description, properties, error, &job);
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if (r < 0) {
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log_error("Failed to start machine scope: %s", bus_error_message(error, r));
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free(scope);
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return r;
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} else {
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m->unit = scope;
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free(m->scope_job);
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m->scope_job = job;
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}
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}
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if (m->unit)
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hashmap_put(m->manager->machine_units, m->unit, m);
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return r;
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}
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int machine_start(Machine *m, sd_bus_message *properties, sd_bus_error *error) {
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int r;
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assert(m);
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if (!IN_SET(m->class, MACHINE_CONTAINER, MACHINE_VM))
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return -EOPNOTSUPP;
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if (m->started)
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return 0;
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r = hashmap_put(m->manager->machine_leaders, UINT_TO_PTR(m->leader), m);
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if (r < 0)
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return r;
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/* Create cgroup */
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r = machine_start_scope(m, properties, error);
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if (r < 0)
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return r;
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log_struct(LOG_INFO,
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LOG_MESSAGE_ID(SD_MESSAGE_MACHINE_START),
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"NAME=%s", m->name,
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"LEADER="PID_FMT, m->leader,
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LOG_MESSAGE("New machine %s.", m->name),
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NULL);
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if (!dual_timestamp_is_set(&m->timestamp))
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dual_timestamp_get(&m->timestamp);
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m->started = true;
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/* Save new machine data */
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machine_save(m);
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machine_send_signal(m, true);
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return 0;
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}
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static int machine_stop_scope(Machine *m) {
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_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
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char *job = NULL;
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int r;
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assert(m);
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assert(m->class != MACHINE_HOST);
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if (!m->unit)
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return 0;
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r = manager_stop_unit(m->manager, m->unit, &error, &job);
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if (r < 0) {
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log_error("Failed to stop machine scope: %s", bus_error_message(&error, r));
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return r;
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}
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free(m->scope_job);
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m->scope_job = job;
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return 0;
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}
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int machine_stop(Machine *m) {
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int r;
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assert(m);
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if (!IN_SET(m->class, MACHINE_CONTAINER, MACHINE_VM))
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return -EOPNOTSUPP;
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r = machine_stop_scope(m);
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m->stopping = true;
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machine_save(m);
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return r;
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}
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int machine_finalize(Machine *m) {
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assert(m);
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if (m->started)
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log_struct(LOG_INFO,
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LOG_MESSAGE_ID(SD_MESSAGE_MACHINE_STOP),
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"NAME=%s", m->name,
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"LEADER="PID_FMT, m->leader,
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LOG_MESSAGE("Machine %s terminated.", m->name),
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NULL);
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machine_unlink(m);
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machine_add_to_gc_queue(m);
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if (m->started) {
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machine_send_signal(m, false);
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m->started = false;
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}
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return 0;
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}
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bool machine_check_gc(Machine *m, bool drop_not_started) {
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assert(m);
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if (m->class == MACHINE_HOST)
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return true;
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if (drop_not_started && !m->started)
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return false;
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if (m->scope_job && manager_job_is_active(m->manager, m->scope_job))
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return true;
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if (m->unit && manager_unit_is_active(m->manager, m->unit))
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return true;
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return false;
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}
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void machine_add_to_gc_queue(Machine *m) {
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assert(m);
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if (m->in_gc_queue)
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return;
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LIST_PREPEND(gc_queue, m->manager->machine_gc_queue, m);
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m->in_gc_queue = true;
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}
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MachineState machine_get_state(Machine *s) {
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assert(s);
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if (s->class == MACHINE_HOST)
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return MACHINE_RUNNING;
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if (s->stopping)
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return MACHINE_CLOSING;
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if (s->scope_job)
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return MACHINE_OPENING;
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return MACHINE_RUNNING;
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}
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int machine_kill(Machine *m, KillWho who, int signo) {
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assert(m);
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if (!IN_SET(m->class, MACHINE_VM, MACHINE_CONTAINER))
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return -EOPNOTSUPP;
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if (!m->unit)
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return -ESRCH;
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if (who == KILL_LEADER) {
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/* If we shall simply kill the leader, do so directly */
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if (kill(m->leader, signo) < 0)
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return -errno;
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return 0;
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}
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/* Otherwise make PID 1 do it for us, for the entire cgroup */
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return manager_kill_unit(m->manager, m->unit, signo, NULL);
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}
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int machine_openpt(Machine *m, int flags) {
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assert(m);
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switch (m->class) {
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case MACHINE_HOST: {
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int fd;
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fd = posix_openpt(flags);
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if (fd < 0)
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return -errno;
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if (unlockpt(fd) < 0)
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return -errno;
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return fd;
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}
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case MACHINE_CONTAINER:
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if (m->leader <= 0)
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return -EINVAL;
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return openpt_in_namespace(m->leader, flags);
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default:
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return -EOPNOTSUPP;
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}
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}
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MachineOperation *machine_operation_unref(MachineOperation *o) {
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if (!o)
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return NULL;
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sd_event_source_unref(o->event_source);
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safe_close(o->errno_fd);
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if (o->pid > 1)
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(void) kill(o->pid, SIGKILL);
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sd_bus_message_unref(o->message);
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if (o->machine) {
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LIST_REMOVE(operations, o->machine->operations, o);
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o->machine->n_operations--;
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}
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free(o);
|
|
return NULL;
|
|
}
|
|
|
|
void machine_release_unit(Machine *m) {
|
|
assert(m);
|
|
|
|
if (!m->unit)
|
|
return;
|
|
|
|
(void) hashmap_remove(m->manager->machine_units, m->unit);
|
|
m->unit = mfree(m->unit);
|
|
}
|
|
|
|
static const char* const machine_class_table[_MACHINE_CLASS_MAX] = {
|
|
[MACHINE_CONTAINER] = "container",
|
|
[MACHINE_VM] = "vm",
|
|
[MACHINE_HOST] = "host",
|
|
};
|
|
|
|
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);
|