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-rw-r--r--src/grp-system/systemd-shutdown/Makefile39
-rw-r--r--src/grp-system/systemd-shutdown/halt.target17
-rw-r--r--src/grp-system/systemd-shutdown/kexec.target17
-rw-r--r--src/grp-system/systemd-shutdown/poweroff.target19
-rw-r--r--src/grp-system/systemd-shutdown/reboot.target19
-rw-r--r--src/grp-system/systemd-shutdown/shutdown.c446
-rw-r--r--src/grp-system/systemd-shutdown/systemd-halt.service.in17
-rw-r--r--src/grp-system/systemd-shutdown/systemd-kexec.service.in17
-rw-r--r--src/grp-system/systemd-shutdown/systemd-poweroff.service.in17
-rw-r--r--src/grp-system/systemd-shutdown/systemd-reboot.service.in17
-rw-r--r--src/grp-system/systemd-shutdown/systemd-shutdown.xml119
-rw-r--r--src/grp-system/systemd-shutdown/umount.c616
-rw-r--r--src/grp-system/systemd-shutdown/umount.h28
13 files changed, 1388 insertions, 0 deletions
diff --git a/src/grp-system/systemd-shutdown/Makefile b/src/grp-system/systemd-shutdown/Makefile
new file mode 100644
index 0000000000..f68758174a
--- /dev/null
+++ b/src/grp-system/systemd-shutdown/Makefile
@@ -0,0 +1,39 @@
+# -*- Mode: makefile; indent-tabs-mode: t -*-
+#
+# This file is part of systemd.
+#
+# Copyright 2010-2012 Lennart Poettering
+# Copyright 2010-2012 Kay Sievers
+# Copyright 2013 Zbigniew Jędrzejewski-Szmek
+# Copyright 2013 David Strauss
+# Copyright 2016 Luke Shumaker
+#
+# 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 $(dir $(lastword $(MAKEFILE_LIST)))/../../../config.mk
+include $(topsrcdir)/build-aux/Makefile.head.mk
+
+rootlibexec_PROGRAMS += systemd-shutdown
+systemd_shutdown_SOURCES = \
+ src/core/umount.c \
+ src/core/umount.h \
+ src/core/shutdown.c \
+ src/core/mount-setup.c \
+ src/core/mount-setup.h \
+ src/core/killall.h \
+ src/core/killall.c
+
+systemd_shutdown_LDADD = \
+ libsystemd-shared.la
+
+include $(topsrcdir)/build-aux/Makefile.tail.mk
diff --git a/src/grp-system/systemd-shutdown/halt.target b/src/grp-system/systemd-shutdown/halt.target
new file mode 100644
index 0000000000..a21d984b26
--- /dev/null
+++ b/src/grp-system/systemd-shutdown/halt.target
@@ -0,0 +1,17 @@
+# This file is part of systemd.
+#
+# 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.
+
+[Unit]
+Description=Halt
+Documentation=man:systemd.special(7)
+DefaultDependencies=no
+Requires=systemd-halt.service
+After=systemd-halt.service
+AllowIsolate=yes
+
+[Install]
+Alias=ctrl-alt-del.target
diff --git a/src/grp-system/systemd-shutdown/kexec.target b/src/grp-system/systemd-shutdown/kexec.target
new file mode 100644
index 0000000000..90795d0c5a
--- /dev/null
+++ b/src/grp-system/systemd-shutdown/kexec.target
@@ -0,0 +1,17 @@
+# This file is part of systemd.
+#
+# 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.
+
+[Unit]
+Description=Reboot via kexec
+Documentation=man:systemd.special(7)
+DefaultDependencies=no
+Requires=systemd-kexec.service
+After=systemd-kexec.service
+AllowIsolate=yes
+
+[Install]
+Alias=ctrl-alt-del.target
diff --git a/src/grp-system/systemd-shutdown/poweroff.target b/src/grp-system/systemd-shutdown/poweroff.target
new file mode 100644
index 0000000000..dd92d816ca
--- /dev/null
+++ b/src/grp-system/systemd-shutdown/poweroff.target
@@ -0,0 +1,19 @@
+# This file is part of systemd.
+#
+# 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.
+
+[Unit]
+Description=Power-Off
+Documentation=man:systemd.special(7)
+DefaultDependencies=no
+Requires=systemd-poweroff.service
+After=systemd-poweroff.service
+AllowIsolate=yes
+JobTimeoutSec=30min
+JobTimeoutAction=poweroff-force
+
+[Install]
+Alias=ctrl-alt-del.target
diff --git a/src/grp-system/systemd-shutdown/reboot.target b/src/grp-system/systemd-shutdown/reboot.target
new file mode 100644
index 0000000000..668b98d9e4
--- /dev/null
+++ b/src/grp-system/systemd-shutdown/reboot.target
@@ -0,0 +1,19 @@
+# This file is part of systemd.
+#
+# 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.
+
+[Unit]
+Description=Reboot
+Documentation=man:systemd.special(7)
+DefaultDependencies=no
+Requires=systemd-reboot.service
+After=systemd-reboot.service
+AllowIsolate=yes
+JobTimeoutSec=30min
+JobTimeoutAction=reboot-force
+
+[Install]
+Alias=ctrl-alt-del.target
diff --git a/src/grp-system/systemd-shutdown/shutdown.c b/src/grp-system/systemd-shutdown/shutdown.c
new file mode 100644
index 0000000000..11e2143089
--- /dev/null
+++ b/src/grp-system/systemd-shutdown/shutdown.c
@@ -0,0 +1,446 @@
+/***
+ This file is part of systemd.
+
+ Copyright 2010 ProFUSION embedded systems
+
+ 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 <errno.h>
+#include <getopt.h>
+#include <signal.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <sys/mman.h>
+#include <sys/mount.h>
+#include <sys/reboot.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include <linux/reboot.h>
+
+#include "core/killall.h"
+#include "systemd-basic/alloc-util.h"
+#include "systemd-basic/cgroup-util.h"
+#include "systemd-basic/def.h"
+#include "systemd-basic/fileio.h"
+#include "systemd-basic/log.h"
+#include "systemd-basic/missing.h"
+#include "systemd-basic/parse-util.h"
+#include "systemd-basic/process-util.h"
+#include "systemd-basic/string-util.h"
+#include "systemd-basic/terminal-util.h"
+#include "systemd-basic/util.h"
+#include "systemd-basic/virt.h"
+#include "systemd-shared/switch-root.h"
+#include "systemd-shared/watchdog.h"
+
+#include "umount.h"
+
+#define FINALIZE_ATTEMPTS 50
+
+static char* arg_verb;
+static uint8_t arg_exit_code;
+
+static int parse_argv(int argc, char *argv[]) {
+ enum {
+ ARG_LOG_LEVEL = 0x100,
+ ARG_LOG_TARGET,
+ ARG_LOG_COLOR,
+ ARG_LOG_LOCATION,
+ ARG_EXIT_CODE,
+ };
+
+ static const struct option options[] = {
+ { "log-level", required_argument, NULL, ARG_LOG_LEVEL },
+ { "log-target", required_argument, NULL, ARG_LOG_TARGET },
+ { "log-color", optional_argument, NULL, ARG_LOG_COLOR },
+ { "log-location", optional_argument, NULL, ARG_LOG_LOCATION },
+ { "exit-code", required_argument, NULL, ARG_EXIT_CODE },
+ {}
+ };
+
+ int c, r;
+
+ assert(argc >= 1);
+ assert(argv);
+
+ /* "-" prevents getopt from permuting argv[] and moving the verb away
+ * from argv[1]. Our interface to initrd promises it'll be there. */
+ while ((c = getopt_long(argc, argv, "-", options, NULL)) >= 0)
+ switch (c) {
+
+ case ARG_LOG_LEVEL:
+ r = log_set_max_level_from_string(optarg);
+ if (r < 0)
+ log_error("Failed to parse log level %s, ignoring.", optarg);
+
+ break;
+
+ case ARG_LOG_TARGET:
+ r = log_set_target_from_string(optarg);
+ if (r < 0)
+ log_error("Failed to parse log target %s, ignoring", optarg);
+
+ break;
+
+ case ARG_LOG_COLOR:
+
+ if (optarg) {
+ r = log_show_color_from_string(optarg);
+ if (r < 0)
+ log_error("Failed to parse log color setting %s, ignoring", optarg);
+ } else
+ log_show_color(true);
+
+ break;
+
+ case ARG_LOG_LOCATION:
+ if (optarg) {
+ r = log_show_location_from_string(optarg);
+ if (r < 0)
+ log_error("Failed to parse log location setting %s, ignoring", optarg);
+ } else
+ log_show_location(true);
+
+ break;
+
+ case ARG_EXIT_CODE:
+ r = safe_atou8(optarg, &arg_exit_code);
+ if (r < 0)
+ log_error("Failed to parse exit code %s, ignoring", optarg);
+
+ break;
+
+ case '\001':
+ if (!arg_verb)
+ arg_verb = optarg;
+ else
+ log_error("Excess arguments, ignoring");
+ break;
+
+ case '?':
+ return -EINVAL;
+
+ default:
+ assert_not_reached("Unhandled option code.");
+ }
+
+ if (!arg_verb) {
+ log_error("Verb argument missing.");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int switch_root_initramfs(void) {
+ if (mount("/run/initramfs", "/run/initramfs", NULL, MS_BIND, NULL) < 0)
+ return log_error_errno(errno, "Failed to mount bind /run/initramfs on /run/initramfs: %m");
+
+ if (mount(NULL, "/run/initramfs", NULL, MS_PRIVATE, NULL) < 0)
+ return log_error_errno(errno, "Failed to make /run/initramfs private mount: %m");
+
+ /* switch_root with MS_BIND, because there might still be processes lurking around, which have open file descriptors.
+ * /run/initramfs/shutdown will take care of these.
+ * Also do not detach the old root, because /run/initramfs/shutdown needs to access it.
+ */
+ return switch_root("/run/initramfs", "/oldroot", false, MS_BIND);
+}
+
+int main(int argc, char *argv[]) {
+ bool need_umount, need_swapoff, need_loop_detach, need_dm_detach;
+ bool in_container, use_watchdog = false;
+ _cleanup_free_ char *cgroup = NULL;
+ char *arguments[3];
+ unsigned retries;
+ int cmd, r;
+ static const char* const dirs[] = {SYSTEM_SHUTDOWN_PATH, NULL};
+
+ log_parse_environment();
+ r = parse_argv(argc, argv);
+ if (r < 0)
+ goto error;
+
+ /* journald will die if not gone yet. The log target defaults
+ * to console, but may have been changed by command line options. */
+
+ log_close_console(); /* force reopen of /dev/console */
+ log_open();
+
+ umask(0022);
+
+ if (getpid() != 1) {
+ log_error("Not executed by init (PID 1).");
+ r = -EPERM;
+ goto error;
+ }
+
+ if (streq(arg_verb, "reboot"))
+ cmd = RB_AUTOBOOT;
+ else if (streq(arg_verb, "poweroff"))
+ cmd = RB_POWER_OFF;
+ else if (streq(arg_verb, "halt"))
+ cmd = RB_HALT_SYSTEM;
+ else if (streq(arg_verb, "kexec"))
+ cmd = LINUX_REBOOT_CMD_KEXEC;
+ else if (streq(arg_verb, "exit"))
+ cmd = 0; /* ignored, just checking that arg_verb is valid */
+ else {
+ r = -EINVAL;
+ log_error("Unknown action '%s'.", arg_verb);
+ goto error;
+ }
+
+ (void) cg_get_root_path(&cgroup);
+ in_container = detect_container() > 0;
+
+ use_watchdog = !!getenv("WATCHDOG_USEC");
+
+ /* Lock us into memory */
+ mlockall(MCL_CURRENT|MCL_FUTURE);
+
+ /* Synchronize everything that is not written to disk yet at this point already. This is a good idea so that
+ * slow IO is processed here already and the final process killing spree is not impacted by processes
+ * desperately trying to sync IO to disk within their timeout. */
+ if (!in_container)
+ sync();
+
+ log_info("Sending SIGTERM to remaining processes...");
+ broadcast_signal(SIGTERM, true, true);
+
+ log_info("Sending SIGKILL to remaining processes...");
+ broadcast_signal(SIGKILL, true, false);
+
+ need_umount = !in_container;
+ need_swapoff = !in_container;
+ need_loop_detach = !in_container;
+ need_dm_detach = !in_container;
+
+ /* Unmount all mountpoints, swaps, and loopback devices */
+ for (retries = 0; retries < FINALIZE_ATTEMPTS; retries++) {
+ bool changed = false;
+
+ if (use_watchdog)
+ watchdog_ping();
+
+ /* Let's trim the cgroup tree on each iteration so
+ that we leave an empty cgroup tree around, so that
+ container managers get a nice notify event when we
+ are down */
+ if (cgroup)
+ cg_trim(SYSTEMD_CGROUP_CONTROLLER, cgroup, false);
+
+ if (need_umount) {
+ log_info("Unmounting file systems.");
+ r = umount_all(&changed);
+ if (r == 0) {
+ need_umount = false;
+ log_info("All filesystems unmounted.");
+ } else if (r > 0)
+ log_info("Not all file systems unmounted, %d left.", r);
+ else
+ log_error_errno(r, "Failed to unmount file systems: %m");
+ }
+
+ if (need_swapoff) {
+ log_info("Deactivating swaps.");
+ r = swapoff_all(&changed);
+ if (r == 0) {
+ need_swapoff = false;
+ log_info("All swaps deactivated.");
+ } else if (r > 0)
+ log_info("Not all swaps deactivated, %d left.", r);
+ else
+ log_error_errno(r, "Failed to deactivate swaps: %m");
+ }
+
+ if (need_loop_detach) {
+ log_info("Detaching loop devices.");
+ r = loopback_detach_all(&changed);
+ if (r == 0) {
+ need_loop_detach = false;
+ log_info("All loop devices detached.");
+ } else if (r > 0)
+ log_info("Not all loop devices detached, %d left.", r);
+ else
+ log_error_errno(r, "Failed to detach loop devices: %m");
+ }
+
+ if (need_dm_detach) {
+ log_info("Detaching DM devices.");
+ r = dm_detach_all(&changed);
+ if (r == 0) {
+ need_dm_detach = false;
+ log_info("All DM devices detached.");
+ } else if (r > 0)
+ log_info("Not all DM devices detached, %d left.", r);
+ else
+ log_error_errno(r, "Failed to detach DM devices: %m");
+ }
+
+ if (!need_umount && !need_swapoff && !need_loop_detach && !need_dm_detach) {
+ if (retries > 0)
+ log_info("All filesystems, swaps, loop devices, DM devices detached.");
+ /* Yay, done */
+ goto initrd_jump;
+ }
+
+ /* If in this iteration we didn't manage to
+ * unmount/deactivate anything, we simply give up */
+ if (!changed) {
+ log_info("Cannot finalize remaining%s%s%s%s continuing.",
+ need_umount ? " file systems," : "",
+ need_swapoff ? " swap devices," : "",
+ need_loop_detach ? " loop devices," : "",
+ need_dm_detach ? " DM devices," : "");
+ goto initrd_jump;
+ }
+
+ log_debug("After %u retries, couldn't finalize remaining %s%s%s%s trying again.",
+ retries + 1,
+ need_umount ? " file systems," : "",
+ need_swapoff ? " swap devices," : "",
+ need_loop_detach ? " loop devices," : "",
+ need_dm_detach ? " DM devices," : "");
+ }
+
+ log_error("Too many iterations, giving up.");
+
+ initrd_jump:
+
+ arguments[0] = NULL;
+ arguments[1] = arg_verb;
+ arguments[2] = NULL;
+ execute_directories(dirs, DEFAULT_TIMEOUT_USEC, arguments);
+
+ if (!in_container && !in_initrd() &&
+ access("/run/initramfs/shutdown", X_OK) == 0) {
+ r = switch_root_initramfs();
+ if (r >= 0) {
+ argv[0] = (char*) "/shutdown";
+
+ setsid();
+ make_console_stdio();
+
+ log_info("Successfully changed into root pivot.\n"
+ "Returning to initrd...");
+
+ execv("/shutdown", argv);
+ log_error_errno(errno, "Failed to execute shutdown binary: %m");
+ } else
+ log_error_errno(r, "Failed to switch root to \"/run/initramfs\": %m");
+
+ }
+
+ if (need_umount || need_swapoff || need_loop_detach || need_dm_detach)
+ log_error("Failed to finalize %s%s%s%s ignoring",
+ need_umount ? " file systems," : "",
+ need_swapoff ? " swap devices," : "",
+ need_loop_detach ? " loop devices," : "",
+ need_dm_detach ? " DM devices," : "");
+
+ /* The kernel will automatically flush ATA disks and suchlike on reboot(), but the file systems need to be
+ * sync'ed explicitly in advance. So let's do this here, but not needlessly slow down containers. Note that we
+ * sync'ed things already once above, but we did some more work since then which might have caused IO, hence
+ * let's doit once more. */
+ if (!in_container)
+ sync();
+
+ if (streq(arg_verb, "exit")) {
+ if (in_container)
+ exit(arg_exit_code);
+ else {
+ /* We cannot exit() on the host, fallback on another
+ * method. */
+ cmd = RB_POWER_OFF;
+ }
+ }
+
+ switch (cmd) {
+
+ case LINUX_REBOOT_CMD_KEXEC:
+
+ if (!in_container) {
+ /* We cheat and exec kexec to avoid doing all its work */
+ pid_t pid;
+
+ log_info("Rebooting with kexec.");
+
+ pid = fork();
+ if (pid < 0)
+ log_error_errno(errno, "Failed to fork: %m");
+ else if (pid == 0) {
+
+ const char * const args[] = {
+ KEXEC, "-e", NULL
+ };
+
+ /* Child */
+
+ execv(args[0], (char * const *) args);
+ _exit(EXIT_FAILURE);
+ } else
+ wait_for_terminate_and_warn("kexec", pid, true);
+ }
+
+ cmd = RB_AUTOBOOT;
+ /* Fall through */
+
+ case RB_AUTOBOOT:
+
+ if (!in_container) {
+ _cleanup_free_ char *param = NULL;
+
+ r = read_one_line_file("/run/systemd/reboot-param", &param);
+ if (r < 0)
+ log_warning_errno(r, "Failed to read reboot parameter file: %m");
+
+ if (!isempty(param)) {
+ log_info("Rebooting with argument '%s'.", param);
+ syscall(SYS_reboot, LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, LINUX_REBOOT_CMD_RESTART2, param);
+ log_warning_errno(errno, "Failed to reboot with parameter, retrying without: %m");
+ }
+ }
+
+ log_info("Rebooting.");
+ break;
+
+ case RB_POWER_OFF:
+ log_info("Powering off.");
+ break;
+
+ case RB_HALT_SYSTEM:
+ log_info("Halting system.");
+ break;
+
+ default:
+ assert_not_reached("Unknown magic");
+ }
+
+ reboot(cmd);
+ if (errno == EPERM && in_container) {
+ /* If we are in a container, and we lacked
+ * CAP_SYS_BOOT just exit, this will kill our
+ * container for good. */
+ log_info("Exiting container.");
+ exit(0);
+ }
+
+ r = log_error_errno(errno, "Failed to invoke reboot(): %m");
+
+ error:
+ log_emergency_errno(r, "Critical error while doing system shutdown: %m");
+ freeze();
+}
diff --git a/src/grp-system/systemd-shutdown/systemd-halt.service.in b/src/grp-system/systemd-shutdown/systemd-halt.service.in
new file mode 100644
index 0000000000..d55d622c1c
--- /dev/null
+++ b/src/grp-system/systemd-shutdown/systemd-halt.service.in
@@ -0,0 +1,17 @@
+# This file is part of systemd.
+#
+# 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.
+
+[Unit]
+Description=Halt
+Documentation=man:systemd-halt.service(8)
+DefaultDependencies=no
+Requires=shutdown.target umount.target final.target
+After=shutdown.target umount.target final.target
+
+[Service]
+Type=oneshot
+ExecStart=@SYSTEMCTL@ --force halt
diff --git a/src/grp-system/systemd-shutdown/systemd-kexec.service.in b/src/grp-system/systemd-shutdown/systemd-kexec.service.in
new file mode 100644
index 0000000000..61303f917f
--- /dev/null
+++ b/src/grp-system/systemd-shutdown/systemd-kexec.service.in
@@ -0,0 +1,17 @@
+# This file is part of systemd.
+#
+# 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.
+
+[Unit]
+Description=Reboot via kexec
+Documentation=man:systemd-halt.service(8)
+DefaultDependencies=no
+Requires=shutdown.target umount.target final.target
+After=shutdown.target umount.target final.target
+
+[Service]
+Type=oneshot
+ExecStart=@SYSTEMCTL@ --force kexec
diff --git a/src/grp-system/systemd-shutdown/systemd-poweroff.service.in b/src/grp-system/systemd-shutdown/systemd-poweroff.service.in
new file mode 100644
index 0000000000..3630719733
--- /dev/null
+++ b/src/grp-system/systemd-shutdown/systemd-poweroff.service.in
@@ -0,0 +1,17 @@
+# This file is part of systemd.
+#
+# 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.
+
+[Unit]
+Description=Power-Off
+Documentation=man:systemd-halt.service(8)
+DefaultDependencies=no
+Requires=shutdown.target umount.target final.target
+After=shutdown.target umount.target final.target
+
+[Service]
+Type=oneshot
+ExecStart=@SYSTEMCTL@ --force poweroff
diff --git a/src/grp-system/systemd-shutdown/systemd-reboot.service.in b/src/grp-system/systemd-shutdown/systemd-reboot.service.in
new file mode 100644
index 0000000000..d99bd3e701
--- /dev/null
+++ b/src/grp-system/systemd-shutdown/systemd-reboot.service.in
@@ -0,0 +1,17 @@
+# This file is part of systemd.
+#
+# 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.
+
+[Unit]
+Description=Reboot
+Documentation=man:systemd-halt.service(8)
+DefaultDependencies=no
+Requires=shutdown.target umount.target final.target
+After=shutdown.target umount.target final.target
+
+[Service]
+Type=oneshot
+ExecStart=@SYSTEMCTL@ --force reboot
diff --git a/src/grp-system/systemd-shutdown/systemd-shutdown.xml b/src/grp-system/systemd-shutdown/systemd-shutdown.xml
new file mode 100644
index 0000000000..d16e5d628f
--- /dev/null
+++ b/src/grp-system/systemd-shutdown/systemd-shutdown.xml
@@ -0,0 +1,119 @@
+<?xml version='1.0'?> <!--*-nxml-*-->
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+ "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+
+<!--
+ This file is part of systemd.
+
+ Copyright 2012 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/>.
+-->
+
+<refentry id="systemd-halt.service">
+
+ <refentryinfo>
+ <title>systemd-halt.service</title>
+ <productname>systemd</productname>
+
+ <authorgroup>
+ <author>
+ <contrib>Developer</contrib>
+ <firstname>Lennart</firstname>
+ <surname>Poettering</surname>
+ <email>lennart@poettering.net</email>
+ </author>
+ </authorgroup>
+ </refentryinfo>
+
+ <refmeta>
+ <refentrytitle>systemd-halt.service</refentrytitle>
+ <manvolnum>8</manvolnum>
+ </refmeta>
+
+ <refnamediv>
+ <refname>systemd-halt.service</refname>
+ <refname>systemd-poweroff.service</refname>
+ <refname>systemd-reboot.service</refname>
+ <refname>systemd-kexec.service</refname>
+ <refname>systemd-shutdown</refname>
+ <refpurpose>System shutdown logic</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <para><filename>systemd-halt.service</filename></para>
+ <para><filename>systemd-poweroff.service</filename></para>
+ <para><filename>systemd-reboot.service</filename></para>
+ <para><filename>systemd-kexec.service</filename></para>
+ <para><filename>/usr/lib/systemd/systemd-shutdown</filename></para>
+ <para><filename>/usr/lib/systemd/system-shutdown/</filename></para>
+ </refsynopsisdiv>
+
+ <refsect1>
+ <title>Description</title>
+
+ <para><filename>systemd-halt.service</filename> is a system
+ service that is pulled in by <filename>halt.target</filename> and
+ is responsible for the actual system halt. Similarly,
+ <filename>systemd-poweroff.service</filename> is pulled in by
+ <filename>poweroff.target</filename>,
+ <filename>systemd-reboot.service</filename> by
+ <filename>reboot.target</filename> and
+ <filename>systemd-kexec.service</filename> by
+ <filename>kexec.target</filename> to execute the respective
+ actions.</para>
+
+ <para>When these services are run, they ensure that PID 1 is
+ replaced by the
+ <filename>/usr/lib/systemd/systemd-shutdown</filename> tool which
+ is then responsible for the actual shutdown. Before shutting down,
+ this binary will try to unmount all remaining file systems,
+ disable all remaining swap devices, detach all remaining storage
+ devices and kill all remaining processes.</para>
+
+ <para>It is necessary to have this code in a separate binary
+ because otherwise rebooting after an upgrade might be broken — the
+ running PID 1 could still depend on libraries which are not
+ available any more, thus keeping the file system busy, which then
+ cannot be re-mounted read-only.</para>
+
+ <para>Immediately before executing the actual system
+ halt/poweroff/reboot/kexec <filename>systemd-shutdown</filename>
+ will run all executables in
+ <filename>/usr/lib/systemd/system-shutdown/</filename> and pass
+ one arguments to them: either <literal>halt</literal>,
+ <literal>poweroff</literal>, <literal>reboot</literal> or
+ <literal>kexec</literal>, depending on the chosen action. All
+ executables in this directory are executed in parallel, and
+ execution of the action is not continued before all executables
+ finished.</para>
+
+ <para>Note that <filename>systemd-halt.service</filename> (and the
+ related units) should never be executed directly. Instead, trigger
+ system shutdown with a command such as <literal>systemctl
+ halt</literal> or suchlike.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>See Also</title>
+ <para>
+ <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>reboot</refentrytitle><manvolnum>2</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemd-suspend.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+ </para>
+ </refsect1>
+
+</refentry>
diff --git a/src/grp-system/systemd-shutdown/umount.c b/src/grp-system/systemd-shutdown/umount.c
new file mode 100644
index 0000000000..1947b58c99
--- /dev/null
+++ b/src/grp-system/systemd-shutdown/umount.c
@@ -0,0 +1,616 @@
+/***
+ This file is part of systemd.
+
+ Copyright 2010 ProFUSION embedded systems
+
+ 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 <errno.h>
+#include <fcntl.h>
+#include <string.h>
+#include <sys/mount.h>
+#include <sys/swap.h>
+
+#include <linux/dm-ioctl.h>
+#include <linux/loop.h>
+
+#include <libudev.h>
+
+#include "core/mount-setup.h"
+#include "systemd-basic/alloc-util.h"
+#include "systemd-basic/escape.h"
+#include "systemd-basic/fd-util.h"
+#include "systemd-basic/list.h"
+#include "systemd-basic/path-util.h"
+#include "systemd-basic/string-util.h"
+#include "systemd-basic/util.h"
+#include "systemd-basic/virt.h"
+#include "systemd-shared/fstab-util.h"
+#include "systemd-shared/udev-util.h"
+
+#include "umount.h"
+
+typedef struct MountPoint {
+ char *path;
+ char *options;
+ dev_t devnum;
+ LIST_FIELDS(struct MountPoint, mount_point);
+} MountPoint;
+
+static void mount_point_free(MountPoint **head, MountPoint *m) {
+ assert(head);
+ assert(m);
+
+ LIST_REMOVE(mount_point, *head, m);
+
+ free(m->path);
+ free(m);
+}
+
+static void mount_points_list_free(MountPoint **head) {
+ assert(head);
+
+ while (*head)
+ mount_point_free(head, *head);
+}
+
+static int mount_points_list_get(MountPoint **head) {
+ _cleanup_fclose_ FILE *proc_self_mountinfo = NULL;
+ unsigned int i;
+ int r;
+
+ assert(head);
+
+ proc_self_mountinfo = fopen("/proc/self/mountinfo", "re");
+ if (!proc_self_mountinfo)
+ return -errno;
+
+ for (i = 1;; i++) {
+ _cleanup_free_ char *path = NULL, *options = NULL;
+ char *p = NULL;
+ MountPoint *m;
+ int k;
+
+ k = fscanf(proc_self_mountinfo,
+ "%*s " /* (1) mount id */
+ "%*s " /* (2) parent id */
+ "%*s " /* (3) major:minor */
+ "%*s " /* (4) root */
+ "%ms " /* (5) mount point */
+ "%*s" /* (6) mount flags */
+ "%*[^-]" /* (7) optional fields */
+ "- " /* (8) separator */
+ "%*s " /* (9) file system type */
+ "%*s" /* (10) mount source */
+ "%ms" /* (11) mount options */
+ "%*[^\n]", /* some rubbish at the end */
+ &path, &options);
+ if (k != 2) {
+ if (k == EOF)
+ break;
+
+ log_warning("Failed to parse /proc/self/mountinfo:%u.", i);
+ continue;
+ }
+
+ r = cunescape(path, UNESCAPE_RELAX, &p);
+ if (r < 0)
+ return r;
+
+ /* Ignore mount points we can't unmount because they
+ * are API or because we are keeping them open (like
+ * /dev/console). Also, ignore all mounts below API
+ * file systems, since they are likely virtual too,
+ * and hence not worth spending time on. Also, in
+ * unprivileged containers we might lack the rights to
+ * unmount these things, hence don't bother. */
+ if (mount_point_is_api(p) ||
+ mount_point_ignore(p) ||
+ path_startswith(p, "/dev") ||
+ path_startswith(p, "/sys") ||
+ path_startswith(p, "/proc")) {
+ free(p);
+ continue;
+ }
+
+ m = new0(MountPoint, 1);
+ if (!m) {
+ free(p);
+ return -ENOMEM;
+ }
+
+ m->path = p;
+ m->options = options;
+ options = NULL;
+
+ LIST_PREPEND(mount_point, *head, m);
+ }
+
+ return 0;
+}
+
+static int swap_list_get(MountPoint **head) {
+ _cleanup_fclose_ FILE *proc_swaps = NULL;
+ unsigned int i;
+ int r;
+
+ assert(head);
+
+ proc_swaps = fopen("/proc/swaps", "re");
+ if (!proc_swaps)
+ return (errno == ENOENT) ? 0 : -errno;
+
+ (void) fscanf(proc_swaps, "%*s %*s %*s %*s %*s\n");
+
+ for (i = 2;; i++) {
+ MountPoint *swap;
+ char *dev = NULL, *d;
+ int k;
+
+ k = fscanf(proc_swaps,
+ "%ms " /* device/file */
+ "%*s " /* type of swap */
+ "%*s " /* swap size */
+ "%*s " /* used */
+ "%*s\n", /* priority */
+ &dev);
+
+ if (k != 1) {
+ if (k == EOF)
+ break;
+
+ log_warning("Failed to parse /proc/swaps:%u.", i);
+ free(dev);
+ continue;
+ }
+
+ if (endswith(dev, " (deleted)")) {
+ free(dev);
+ continue;
+ }
+
+ r = cunescape(dev, UNESCAPE_RELAX, &d);
+ free(dev);
+ if (r < 0)
+ return r;
+
+ swap = new0(MountPoint, 1);
+ if (!swap) {
+ free(d);
+ return -ENOMEM;
+ }
+
+ swap->path = d;
+ LIST_PREPEND(mount_point, *head, swap);
+ }
+
+ return 0;
+}
+
+static int loopback_list_get(MountPoint **head) {
+ _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL;
+ struct udev_list_entry *item = NULL, *first = NULL;
+ _cleanup_udev_unref_ struct udev *udev = NULL;
+ int r;
+
+ assert(head);
+
+ udev = udev_new();
+ if (!udev)
+ return -ENOMEM;
+
+ e = udev_enumerate_new(udev);
+ if (!e)
+ return -ENOMEM;
+
+ r = udev_enumerate_add_match_subsystem(e, "block");
+ if (r < 0)
+ return r;
+
+ r = udev_enumerate_add_match_sysname(e, "loop*");
+ if (r < 0)
+ return r;
+
+ r = udev_enumerate_add_match_sysattr(e, "loop/backing_file", NULL);
+ if (r < 0)
+ return r;
+
+ r = udev_enumerate_scan_devices(e);
+ if (r < 0)
+ return r;
+
+ first = udev_enumerate_get_list_entry(e);
+ udev_list_entry_foreach(item, first) {
+ MountPoint *lb;
+ _cleanup_udev_device_unref_ struct udev_device *d;
+ char *loop;
+ const char *dn;
+
+ d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item));
+ if (!d)
+ return -ENOMEM;
+
+ dn = udev_device_get_devnode(d);
+ if (!dn)
+ continue;
+
+ loop = strdup(dn);
+ if (!loop)
+ return -ENOMEM;
+
+ lb = new0(MountPoint, 1);
+ if (!lb) {
+ free(loop);
+ return -ENOMEM;
+ }
+
+ lb->path = loop;
+ LIST_PREPEND(mount_point, *head, lb);
+ }
+
+ return 0;
+}
+
+static int dm_list_get(MountPoint **head) {
+ _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL;
+ struct udev_list_entry *item = NULL, *first = NULL;
+ _cleanup_udev_unref_ struct udev *udev = NULL;
+ int r;
+
+ assert(head);
+
+ udev = udev_new();
+ if (!udev)
+ return -ENOMEM;
+
+ e = udev_enumerate_new(udev);
+ if (!e)
+ return -ENOMEM;
+
+ r = udev_enumerate_add_match_subsystem(e, "block");
+ if (r < 0)
+ return r;
+
+ r = udev_enumerate_add_match_sysname(e, "dm-*");
+ if (r < 0)
+ return r;
+
+ r = udev_enumerate_scan_devices(e);
+ if (r < 0)
+ return r;
+
+ first = udev_enumerate_get_list_entry(e);
+ udev_list_entry_foreach(item, first) {
+ MountPoint *m;
+ _cleanup_udev_device_unref_ struct udev_device *d;
+ dev_t devnum;
+ char *node;
+ const char *dn;
+
+ d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item));
+ if (!d)
+ return -ENOMEM;
+
+ devnum = udev_device_get_devnum(d);
+ dn = udev_device_get_devnode(d);
+ if (major(devnum) == 0 || !dn)
+ continue;
+
+ node = strdup(dn);
+ if (!node)
+ return -ENOMEM;
+
+ m = new(MountPoint, 1);
+ if (!m) {
+ free(node);
+ return -ENOMEM;
+ }
+
+ m->path = node;
+ m->devnum = devnum;
+ LIST_PREPEND(mount_point, *head, m);
+ }
+
+ return 0;
+}
+
+static int delete_loopback(const char *device) {
+ _cleanup_close_ int fd = -1;
+ int r;
+
+ fd = open(device, O_RDONLY|O_CLOEXEC);
+ if (fd < 0)
+ return errno == ENOENT ? 0 : -errno;
+
+ r = ioctl(fd, LOOP_CLR_FD, 0);
+ if (r >= 0)
+ return 1;
+
+ /* ENXIO: not bound, so no error */
+ if (errno == ENXIO)
+ return 0;
+
+ return -errno;
+}
+
+static int delete_dm(dev_t devnum) {
+ _cleanup_close_ int fd = -1;
+ int r;
+ struct dm_ioctl dm = {
+ .version = {DM_VERSION_MAJOR,
+ DM_VERSION_MINOR,
+ DM_VERSION_PATCHLEVEL},
+ .data_size = sizeof(dm),
+ .dev = devnum,
+ };
+
+ assert(major(devnum) != 0);
+
+ fd = open("/dev/mapper/control", O_RDWR|O_CLOEXEC);
+ if (fd < 0)
+ return -errno;
+
+ r = ioctl(fd, DM_DEV_REMOVE, &dm);
+ return r >= 0 ? 0 : -errno;
+}
+
+static int mount_points_list_umount(MountPoint **head, bool *changed, bool log_error) {
+ MountPoint *m, *n;
+ int n_failed = 0;
+
+ assert(head);
+
+ LIST_FOREACH_SAFE(mount_point, m, n, *head) {
+
+ /* If we are in a container, don't attempt to
+ read-only mount anything as that brings no real
+ benefits, but might confuse the host, as we remount
+ the superblock here, not the bind mount. */
+ if (detect_container() <= 0) {
+ _cleanup_free_ char *options = NULL;
+ /* MS_REMOUNT requires that the data parameter
+ * should be the same from the original mount
+ * except for the desired changes. Since we want
+ * to remount read-only, we should filter out
+ * rw (and ro too, because it confuses the kernel) */
+ (void) fstab_filter_options(m->options, "rw\0ro\0", NULL, NULL, &options);
+
+ /* We always try to remount directories
+ * read-only first, before we go on and umount
+ * them.
+ *
+ * Mount points can be stacked. If a mount
+ * point is stacked below / or /usr, we
+ * cannot umount or remount it directly,
+ * since there is no way to refer to the
+ * underlying mount. There's nothing we can do
+ * about it for the general case, but we can
+ * do something about it if it is aliased
+ * somehwere else via a bind mount. If we
+ * explicitly remount the super block of that
+ * alias read-only we hence should be
+ * relatively safe regarding keeping the fs we
+ * can otherwise not see dirty. */
+ log_info("Remounting '%s' read-only with options '%s'.", m->path, options);
+ (void) mount(NULL, m->path, NULL, MS_REMOUNT|MS_RDONLY, options);
+ }
+
+ /* Skip / and /usr since we cannot unmount that
+ * anyway, since we are running from it. They have
+ * already been remounted ro. */
+ if (path_equal(m->path, "/")
+#ifndef HAVE_SPLIT_USR
+ || path_equal(m->path, "/usr")
+#endif
+ || path_startswith(m->path, "/run/initramfs")
+ )
+ continue;
+
+ /* Trying to umount. We don't force here since we rely
+ * on busy NFS and FUSE file systems to return EBUSY
+ * until we closed everything on top of them. */
+ log_info("Unmounting %s.", m->path);
+ if (umount2(m->path, 0) == 0) {
+ if (changed)
+ *changed = true;
+
+ mount_point_free(head, m);
+ } else if (log_error) {
+ log_warning_errno(errno, "Could not unmount %s: %m", m->path);
+ n_failed++;
+ }
+ }
+
+ return n_failed;
+}
+
+static int swap_points_list_off(MountPoint **head, bool *changed) {
+ MountPoint *m, *n;
+ int n_failed = 0;
+
+ assert(head);
+
+ LIST_FOREACH_SAFE(mount_point, m, n, *head) {
+ log_info("Deactivating swap %s.", m->path);
+ if (swapoff(m->path) == 0) {
+ if (changed)
+ *changed = true;
+
+ mount_point_free(head, m);
+ } else {
+ log_warning_errno(errno, "Could not deactivate swap %s: %m", m->path);
+ n_failed++;
+ }
+ }
+
+ return n_failed;
+}
+
+static int loopback_points_list_detach(MountPoint **head, bool *changed) {
+ MountPoint *m, *n;
+ int n_failed = 0, k;
+ struct stat root_st;
+
+ assert(head);
+
+ k = lstat("/", &root_st);
+
+ LIST_FOREACH_SAFE(mount_point, m, n, *head) {
+ int r;
+ struct stat loopback_st;
+
+ if (k >= 0 &&
+ major(root_st.st_dev) != 0 &&
+ lstat(m->path, &loopback_st) >= 0 &&
+ root_st.st_dev == loopback_st.st_rdev) {
+ n_failed++;
+ continue;
+ }
+
+ log_info("Detaching loopback %s.", m->path);
+ r = delete_loopback(m->path);
+ if (r >= 0) {
+ if (r > 0 && changed)
+ *changed = true;
+
+ mount_point_free(head, m);
+ } else {
+ log_warning_errno(errno, "Could not detach loopback %s: %m", m->path);
+ n_failed++;
+ }
+ }
+
+ return n_failed;
+}
+
+static int dm_points_list_detach(MountPoint **head, bool *changed) {
+ MountPoint *m, *n;
+ int n_failed = 0, k;
+ struct stat root_st;
+
+ assert(head);
+
+ k = lstat("/", &root_st);
+
+ LIST_FOREACH_SAFE(mount_point, m, n, *head) {
+ int r;
+
+ if (k >= 0 &&
+ major(root_st.st_dev) != 0 &&
+ root_st.st_dev == m->devnum) {
+ n_failed++;
+ continue;
+ }
+
+ log_info("Detaching DM %u:%u.", major(m->devnum), minor(m->devnum));
+ r = delete_dm(m->devnum);
+ if (r >= 0) {
+ if (changed)
+ *changed = true;
+
+ mount_point_free(head, m);
+ } else {
+ log_warning_errno(errno, "Could not detach DM %s: %m", m->path);
+ n_failed++;
+ }
+ }
+
+ return n_failed;
+}
+
+int umount_all(bool *changed) {
+ int r;
+ bool umount_changed;
+ LIST_HEAD(MountPoint, mp_list_head);
+
+ LIST_HEAD_INIT(mp_list_head);
+ r = mount_points_list_get(&mp_list_head);
+ if (r < 0)
+ goto end;
+
+ /* retry umount, until nothing can be umounted anymore */
+ do {
+ umount_changed = false;
+
+ mount_points_list_umount(&mp_list_head, &umount_changed, false);
+ if (umount_changed)
+ *changed = true;
+
+ } while (umount_changed);
+
+ /* umount one more time with logging enabled */
+ r = mount_points_list_umount(&mp_list_head, &umount_changed, true);
+ if (r <= 0)
+ goto end;
+
+ end:
+ mount_points_list_free(&mp_list_head);
+
+ return r;
+}
+
+int swapoff_all(bool *changed) {
+ int r;
+ LIST_HEAD(MountPoint, swap_list_head);
+
+ LIST_HEAD_INIT(swap_list_head);
+
+ r = swap_list_get(&swap_list_head);
+ if (r < 0)
+ goto end;
+
+ r = swap_points_list_off(&swap_list_head, changed);
+
+ end:
+ mount_points_list_free(&swap_list_head);
+
+ return r;
+}
+
+int loopback_detach_all(bool *changed) {
+ int r;
+ LIST_HEAD(MountPoint, loopback_list_head);
+
+ LIST_HEAD_INIT(loopback_list_head);
+
+ r = loopback_list_get(&loopback_list_head);
+ if (r < 0)
+ goto end;
+
+ r = loopback_points_list_detach(&loopback_list_head, changed);
+
+ end:
+ mount_points_list_free(&loopback_list_head);
+
+ return r;
+}
+
+int dm_detach_all(bool *changed) {
+ int r;
+ LIST_HEAD(MountPoint, dm_list_head);
+
+ LIST_HEAD_INIT(dm_list_head);
+
+ r = dm_list_get(&dm_list_head);
+ if (r < 0)
+ goto end;
+
+ r = dm_points_list_detach(&dm_list_head, changed);
+
+ end:
+ mount_points_list_free(&dm_list_head);
+
+ return r;
+}
diff --git a/src/grp-system/systemd-shutdown/umount.h b/src/grp-system/systemd-shutdown/umount.h
new file mode 100644
index 0000000000..4e2215a47d
--- /dev/null
+++ b/src/grp-system/systemd-shutdown/umount.h
@@ -0,0 +1,28 @@
+#pragma once
+
+/***
+ This file is part of systemd.
+
+ Copyright 2010 ProFUSION embedded systems
+
+ 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/>.
+***/
+
+int umount_all(bool *changed);
+
+int swapoff_all(bool *changed);
+
+int loopback_detach_all(bool *changed);
+
+int dm_detach_all(bool *changed);
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-21 22:51:52 +0000