shutdown: move shutdown to core since it replaces PID 1

1 files changed, 0 insertions, 492 deletions

diff --git a/src/shutdown.c b/src/shutdown.c
deleted file mode 100644
index cd478b0349..0000000000
--- a/src/shutdown.c
+++ /dev/null
@@ -1,492 +0,0 @@
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-/***
-  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 <sys/mman.h>
-#include <sys/types.h>
-#include <sys/reboot.h>
-#include <linux/reboot.h>
-#include <sys/wait.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <sys/mount.h>
-#include <sys/syscall.h>
-#include <fcntl.h>
-#include <dirent.h>
-#include <errno.h>
-#include <unistd.h>
-#include <signal.h>
-#include <stdbool.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "missing.h"
-#include "log.h"
-#include "umount.h"
-#include "util.h"
-#include "mkdir.h"
-#include "virt.h"
-#include "watchdog.h"
-
-#define TIMEOUT_USEC (5 * USEC_PER_SEC)
-#define FINALIZE_ATTEMPTS 50
-
-static bool ignore_proc(pid_t pid) {
-        char buf[PATH_MAX];
-        FILE *f;
-        char c;
-        size_t count;
-        uid_t uid;
-        int r;
-
-        /* We are PID 1, let's not commit suicide */
-        if (pid == 1)
-                return true;
-
-        r = get_process_uid(pid, &uid);
-        if (r < 0)
-                return true; /* not really, but better safe than sorry */
-
-        /* Non-root processes otherwise are always subject to be killed */
-        if (uid != 0)
-                return false;
-
-        snprintf(buf, sizeof(buf), "/proc/%lu/cmdline", (unsigned long) pid);
-        char_array_0(buf);
-
-        f = fopen(buf, "re");
-        if (!f)
-                return true; /* not really, but has the desired effect */
-
-        count = fread(&c, 1, 1, f);
-        fclose(f);
-
-        /* Kernel threads have an empty cmdline */
-        if (count <= 0)
-                return true;
-
-        /* Processes with argv[0][0] = '@' we ignore from the killing
-         * spree.
-         *
-         * http://www.freedesktop.org/wiki/Software/systemd/RootStorageDaemons */
-        if (count == 1 && c == '@')
-                return true;
-
-        return false;
-}
-
-static int killall(int sign) {
-        DIR *dir;
-        struct dirent *d;
-        unsigned int n_processes = 0;
-
-        dir = opendir("/proc");
-        if (!dir)
-                return -errno;
-
-        while ((d = readdir(dir))) {
-                pid_t pid;
-
-                if (parse_pid(d->d_name, &pid) < 0)
-                        continue;
-
-                if (ignore_proc(pid))
-                        continue;
-
-                if (kill(pid, sign) == 0)
-                        n_processes++;
-                else
-                        log_warning("Could not kill %d: %m", pid);
-        }
-
-        closedir(dir);
-
-        return n_processes;
-}
-
-static void wait_for_children(int n_processes, sigset_t *mask) {
-        usec_t until;
-
-        assert(mask);
-
-        until = now(CLOCK_MONOTONIC) + TIMEOUT_USEC;
-        for (;;) {
-                struct timespec ts;
-                int k;
-                usec_t n;
-
-                for (;;) {
-                        pid_t pid = waitpid(-1, NULL, WNOHANG);
-
-                        if (pid == 0)
-                                break;
-
-                        if (pid < 0 && errno == ECHILD)
-                                return;
-
-                        if (n_processes > 0)
-                                if (--n_processes == 0)
-                                        return;
-                }
-
-                n = now(CLOCK_MONOTONIC);
-                if (n >= until)
-                        return;
-
-                timespec_store(&ts, until - n);
-
-                if ((k = sigtimedwait(mask, NULL, &ts)) != SIGCHLD) {
-
-                        if (k < 0 && errno != EAGAIN) {
-                                log_error("sigtimedwait() failed: %m");
-                                return;
-                        }
-
-                        if (k >= 0)
-                                log_warning("sigtimedwait() returned unexpected signal.");
-                }
-        }
-}
-
-static void send_signal(int sign) {
-        sigset_t mask, oldmask;
-        int n_processes;
-
-        assert_se(sigemptyset(&mask) == 0);
-        assert_se(sigaddset(&mask, SIGCHLD) == 0);
-        assert_se(sigprocmask(SIG_BLOCK, &mask, &oldmask) == 0);
-
-        if (kill(-1, SIGSTOP) < 0 && errno != ESRCH)
-                log_warning("kill(-1, SIGSTOP) failed: %m");
-
-        n_processes = killall(sign);
-
-        if (kill(-1, SIGCONT) < 0 && errno != ESRCH)
-                log_warning("kill(-1, SIGCONT) failed: %m");
-
-        if (n_processes <= 0)
-                goto finish;
-
-        wait_for_children(n_processes, &mask);
-
-finish:
-        sigprocmask(SIG_SETMASK, &oldmask, NULL);
-}
-
-static void ultimate_send_signal(int sign) {
-        sigset_t mask, oldmask;
-        int r;
-
-        assert_se(sigemptyset(&mask) == 0);
-        assert_se(sigaddset(&mask, SIGCHLD) == 0);
-        assert_se(sigprocmask(SIG_BLOCK, &mask, &oldmask) == 0);
-
-        if (kill(-1, SIGSTOP) < 0 && errno != ESRCH)
-                log_warning("kill(-1, SIGSTOP) failed: %m");
-
-        r = kill(-1, sign);
-        if (r < 0 && errno != ESRCH)
-                log_warning("kill(-1, %s) failed: %m", signal_to_string(sign));
-
-        if (kill(-1, SIGCONT) < 0 && errno != ESRCH)
-                log_warning("kill(-1, SIGCONT) failed: %m");
-
-        if (r < 0)
-                goto finish;
-
-        wait_for_children(0, &mask);
-
-finish:
-        sigprocmask(SIG_SETMASK, &oldmask, NULL);
-}
-
-static int prepare_new_root(void) {
-        static const char dirs[] =
-                "/run/initramfs/oldroot\0"
-                "/run/initramfs/proc\0"
-                "/run/initramfs/sys\0"
-                "/run/initramfs/dev\0"
-                "/run/initramfs/run\0";
-
-        const char *dir;
-
-        if (mount("/run/initramfs", "/run/initramfs", NULL, MS_BIND, NULL) < 0) {
-                log_error("Failed to mount bind /run/initramfs on /run/initramfs: %m");
-                return -errno;
-        }
-
-        if (mount(NULL, "/run/initramfs", NULL, MS_PRIVATE, NULL) < 0) {
-                log_error("Failed to make /run/initramfs private mount: %m");
-                return -errno;
-        }
-
-        NULSTR_FOREACH(dir, dirs)
-                if (mkdir_p(dir, 0755) < 0 && errno != EEXIST) {
-                        log_error("Failed to mkdir %s: %m", dir);
-                        return -errno;
-                }
-
-        if (mount("/sys", "/run/initramfs/sys", NULL, MS_BIND, NULL) < 0) {
-                log_error("Failed to mount bind /sys on /run/initramfs/sys: %m");
-                return -errno;
-        }
-
-        if (mount("/proc", "/run/initramfs/proc", NULL, MS_BIND, NULL) < 0) {
-                log_error("Failed to mount bind /proc on /run/initramfs/proc: %m");
-                return -errno;
-        }
-
-        if (mount("/dev", "/run/initramfs/dev", NULL, MS_BIND, NULL) < 0) {
-                log_error("Failed to mount bind /dev on /run/initramfs/dev: %m");
-                return -errno;
-        }
-
-        if (mount("/run", "/run/initramfs/run", NULL, MS_BIND, NULL) < 0) {
-                log_error("Failed to mount bind /run on /run/initramfs/run: %m");
-                return -errno;
-        }
-
-        return 0;
-}
-
-static int pivot_to_new_root(void) {
-        int fd;
-
-        chdir("/run/initramfs");
-
-        /*
-          In case some evil process made "/" MS_SHARED
-          It works for pivot_root, but the ref count for the root device
-          is not decreasing :-/
-        */
-        if (mount(NULL, "/", NULL, MS_PRIVATE, NULL) < 0) {
-                log_error("Failed to make \"/\" private mount %m");
-                return -errno;
-        }
-
-        if (pivot_root(".", "oldroot") < 0) {
-                log_error("pivot failed: %m");
-                /* only chroot if pivot root succeded */
-                return -errno;
-        }
-
-        chroot(".");
-        log_info("Successfully changed into root pivot.");
-
-        fd = open("/dev/console", O_RDWR);
-        if (fd < 0)
-                log_error("Failed to open /dev/console: %m");
-        else {
-                make_stdio(fd);
-
-                /* Initialize the controlling terminal */
-                setsid();
-                ioctl(STDIN_FILENO, TIOCSCTTY, NULL);
-        }
-
-        return 0;
-}
-
-int main(int argc, char *argv[]) {
-        int cmd, r;
-        unsigned retries;
-        bool need_umount = true, need_swapoff = true, need_loop_detach = true, need_dm_detach = true;
-        bool killed_everbody = false, in_container, use_watchdog = false;
-
-        log_parse_environment();
-        log_set_target(LOG_TARGET_CONSOLE); /* syslog will die if not gone yet */
-        log_open();
-
-        umask(0022);
-
-        if (getpid() != 1) {
-                log_error("Not executed by init (pid 1).");
-                r = -EPERM;
-                goto error;
-        }
-
-        if (argc != 2) {
-                log_error("Invalid number of arguments.");
-                r = -EINVAL;
-                goto error;
-        }
-
-        in_container = detect_container(NULL) > 0;
-
-        if (streq(argv[1], "reboot"))
-                cmd = RB_AUTOBOOT;
-        else if (streq(argv[1], "poweroff"))
-                cmd = RB_POWER_OFF;
-        else if (streq(argv[1], "halt"))
-                cmd = RB_HALT_SYSTEM;
-        else if (streq(argv[1], "kexec"))
-                cmd = LINUX_REBOOT_CMD_KEXEC;
-        else {
-                log_error("Unknown action '%s'.", argv[1]);
-                r = -EINVAL;
-                goto error;
-        }
-
-        use_watchdog = !!getenv("WATCHDOG_USEC");
-
-        /* lock us into memory */
-        if (mlockall(MCL_CURRENT|MCL_FUTURE) != 0)
-                log_warning("Cannot lock process memory: %m");
-
-        log_info("Sending SIGTERM to remaining processes...");
-        send_signal(SIGTERM);
-
-        log_info("Sending SIGKILL to remaining processes...");
-        send_signal(SIGKILL);
-
-        if (in_container)
-                need_swapoff = false;
-
-        /* Unmount all mountpoints, swaps, and loopback devices */
-        for (retries = 0; retries < FINALIZE_ATTEMPTS; retries++) {
-                bool changed = false;
-
-                if (use_watchdog)
-                        watchdog_ping();
-
-                if (need_umount) {
-                        log_info("Unmounting file systems.");
-                        r = umount_all(&changed);
-                        if (r == 0)
-                                need_umount = false;
-                        else if (r > 0)
-                                log_info("Not all file systems unmounted, %d left.", r);
-                        else
-                                log_error("Failed to unmount file systems: %s", strerror(-r));
-                }
-
-                if (need_swapoff) {
-                        log_info("Disabling swaps.");
-                        r = swapoff_all(&changed);
-                        if (r == 0)
-                                need_swapoff = false;
-                        else if (r > 0)
-                                log_info("Not all swaps are turned off, %d left.", r);
-                        else
-                                log_error("Failed to turn off swaps: %s", strerror(-r));
-                }
-
-                if (need_loop_detach) {
-                        log_info("Detaching loop devices.");
-                        r = loopback_detach_all(&changed);
-                        if (r == 0)
-                                need_loop_detach = false;
-                        else if (r > 0)
-                                log_info("Not all loop devices detached, %d left.", r);
-                        else
-                                log_error("Failed to detach loop devices: %s", strerror(-r));
-                }
-
-                if (need_dm_detach) {
-                        log_info("Detaching DM devices.");
-                        r = dm_detach_all(&changed);
-                        if (r == 0)
-                                need_dm_detach = false;
-                        else if (r > 0)
-                                log_warning("Not all DM devices detached, %d left.", r);
-                        else
-                                log_error("Failed to detach DM devices: %s", strerror(-r));
-                }
-
-                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 */
-                        break;
-                }
-
-                /* If in this iteration we didn't manage to
-                 * unmount/deactivate anything, we either kill more
-                 * processes, or simply give up */
-                if (!changed) {
-
-                        if (killed_everbody) {
-                                /* Hmm, we already killed everybody,
-                                 * let's just give up */
-                                log_error("Cannot finalize remaining file systems and devices, giving up.");
-                                break;
-                        }
-
-                        log_warning("Cannot finalize remaining file systems and devices, trying to kill remaining processes.");
-                        ultimate_send_signal(SIGTERM);
-                        ultimate_send_signal(SIGKILL);
-                        killed_everbody = true;
-                }
-
-                log_debug("Couldn't finalize remaining file systems and devices after %u retries, trying again.", retries+1);
-        }
-
-        if (retries >= FINALIZE_ATTEMPTS)
-                log_error("Too many iterations, giving up.");
-
-        execute_directory(SYSTEM_SHUTDOWN_PATH, NULL, NULL);
-
-        /* If we are in a container, just exit, this will kill our
-         * container for good. */
-        if (in_container) {
-                log_error("Exiting container.");
-                exit(0);
-        }
-
-        if (access("/run/initramfs/shutdown", X_OK) == 0) {
-
-                if (prepare_new_root() >= 0 &&
-                    pivot_to_new_root() >= 0) {
-                        execv("/shutdown", argv);
-                        log_error("Failed to execute shutdown binary: %m");
-                }
-        }
-
-        sync();
-
-        if (cmd == LINUX_REBOOT_CMD_KEXEC) {
-                /* We cheat and exec kexec to avoid doing all its work */
-                pid_t pid = fork();
-
-                if (pid < 0)
-                        log_error("Could not fork: %m. Falling back to normal reboot.");
-                else if (pid > 0) {
-                        wait_for_terminate_and_warn("kexec", pid);
-                        log_warning("kexec failed. Falling back to normal reboot.");
-                } else {
-                        /* Child */
-                        const char *args[3] = { "/sbin/kexec", "-e", NULL };
-                        execv(args[0], (char * const *) args);
-                        return EXIT_FAILURE;
-                }
-
-                cmd = RB_AUTOBOOT;
-        }
-
-        reboot(cmd);
-        log_error("Failed to invoke reboot(): %m");
-        r = -errno;
-
-  error:
-        log_error("Critical error while doing system shutdown: %s", strerror(-r));
-
-        freeze();
-        return EXIT_FAILURE;
-}