./tools/notsd-move

1 files changed, 442 insertions, 0 deletions

diff --git a/src/grp-system/systemd-shutdown/shutdown.c b/src/grp-system/systemd-shutdown/shutdown.c
new file mode 100644
index 0000000000..516128e2d1
--- /dev/null
+++ b/src/grp-system/systemd-shutdown/shutdown.c
@@ -0,0 +1,442 @@
+/***
+  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 "basic/alloc-util.h"
+#include "basic/cgroup-util.h"
+#include "basic/def.h"
+#include "basic/fileio.h"
+#include "basic/log.h"
+#include "basic/missing.h"
+#include "basic/parse-util.h"
+#include "basic/process-util.h"
+#include "basic/string-util.h"
+#include "basic/terminal-util.h"
+#include "basic/util.h"
+#include "basic/virt.h"
+#include "killall.h"
+#include "shared/switch-root.h"
+#include "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);
+
+        use_watchdog = !!getenv("WATCHDOG_USEC");
+
+        /* lock us into memory */
+        mlockall(MCL_CURRENT|MCL_FUTURE);
+
+        log_info("Sending SIGTERM to remaining processes...");
+        broadcast_signal(SIGTERM, true, true);
+
+        log_info("Sending SIGKILL to remaining processes...");
+        broadcast_signal(SIGKILL, true, false);
+
+        in_container = detect_container() > 0;
+
+        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 automaticall flush ATA disks and suchlike
+         * on reboot(), but the file systems need to be synce'd
+         * explicitly in advance. So let's do this here, but not
+         * needlessly slow down containers. */
+        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();
+}