[systemd-devel] [PATCH] shutdown: add kexec loading, avoid calling `kexec` binary unnessecarily
Shawn Landden
shawn at churchofgit.com
Wed Mar 11 17:22:18 PDT 2015
Still use helper when Xen Dom0, to avoid duplicating some hairy code.
I think the rbtree version was far more understandable as greedy_realloc0()
is very messy to do correctly.
Take fopenat() from lsof.
Add opendirat()
Future: generate BootLoaderSpec files for other kernel install locations
v5: fix syscall invocation from draft version
v6: usr either /boot/efi or /boot
---
Makefile.am | 4 +-
TODO | 3 -
man/systemctl.xml | 15 ++-
src/core/shutdown.c | 30 ++++--
src/shared/fileio.c | 69 +++++++++++++
src/shared/fileio.h | 5 +
src/shared/missing.h | 11 +++
src/shared/rpmvercmp.c | 26 +++--
src/shared/strv.c | 9 +-
src/systemctl/bootspec.c | 247 ++++++++++++++++++++++++++++++++++++++++++++++
src/systemctl/bootspec.h | 48 +++++++++
src/systemctl/systemctl.c | 57 ++++++++++-
12 files changed, 495 insertions(+), 29 deletions(-)
create mode 100644 src/systemctl/bootspec.c
create mode 100644 src/systemctl/bootspec.h
diff --git a/Makefile.am b/Makefile.am
index 353a7de..20a6484 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -2736,7 +2736,9 @@ systemd_escape_LDADD = \
# -----------------------------------------------------------------------------
systemctl_SOURCES = \
- src/systemctl/systemctl.c
+ src/systemctl/systemctl.c \
+ src/systemctl/bootspec.c \
+ src/systemctl/bootspec.h
systemctl_LDADD = \
libsystemd-units.la \
diff --git a/TODO b/TODO
index 6180077..9ba7be0 100644
--- a/TODO
+++ b/TODO
@@ -86,9 +86,6 @@ Features:
* maybe introduce WantsMountsFor=? Usecase:
http://lists.freedesktop.org/archives/systemd-devel/2015-January/027729.html
-* rework kexec logic to use new kexec_file_load() syscall, so that we
- don't have to call kexec tool anymore.
-
* The udev blkid built-in should expose a property that reflects
whether media was sensed in USB CF/SD card readers. This should then
be used to control SYSTEMD_READY=1/0 so that USB card readers aren't
diff --git a/man/systemctl.xml b/man/systemctl.xml
index 338c1d3..c550339 100644
--- a/man/systemctl.xml
+++ b/man/systemctl.xml
@@ -607,6 +607,15 @@ kobject-uevent 1 systemd-udevd-kernel.socket systemd-udevd.service
</varlistentry>
<varlistentry>
+ <term><command>list-kernels</command></term>
+
+ <listitem>
+ <para>List kernels ordered by version.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
<term><command>start <replaceable>PATTERN</replaceable>...</command></term>
<listitem>
@@ -1550,7 +1559,7 @@ kobject-uevent 1 systemd-udevd-kernel.socket systemd-udevd.service
</varlistentry>
<varlistentry>
- <term><command>kexec</command></term>
+ <term><command>kexec <optional><replaceable>VERSION</replaceable></optional><optional><replaceable>KERNEL-ARG</replaceable>...</optional></command></term>
<listitem>
<para>Shut down and reboot the system via kexec. This is
@@ -1560,6 +1569,10 @@ kobject-uevent 1 systemd-udevd-kernel.socket systemd-udevd.service
services is skipped, however all processes are killed and
all file systems are unmounted or mounted read-only,
immediately followed by the reboot.</para>
+
+ <para>Also allows specifying the version and optionally
+ extra kernel parameters to append. If no version is specified
+ then the most recent kernel is booted.</para>
</listitem>
</varlistentry>
diff --git a/src/core/shutdown.c b/src/core/shutdown.c
index 70a461e..616a70a 100644
--- a/src/core/shutdown.c
+++ b/src/core/shutdown.c
@@ -19,6 +19,7 @@
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
+#include <ctype.h>
#include <sys/mman.h>
#include <sys/reboot.h>
#include <linux/reboot.h>
@@ -173,15 +174,21 @@ int main(int argc, char *argv[]) {
goto error;
}
+ in_container = !!detect_virtualization(NULL);
+
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 {
+ else if (streq(arg_verb, "kexec")) {
+ if (in_container) {
+ log_warning("Can't kexec from container. Rebooting…");
+ cmd = RB_AUTOBOOT;
+ } else
+ cmd = LINUX_REBOOT_CMD_KEXEC;
+ } else {
r = -EINVAL;
log_error("Unknown action '%s'.", arg_verb);
goto error;
@@ -200,8 +207,6 @@ int main(int argc, char *argv[]) {
log_info("Sending SIGKILL to remaining processes...");
broadcast_signal(SIGKILL, true, false);
- in_container = detect_container(NULL) > 0;
-
need_umount = !in_container;
need_swapoff = !in_container;
need_loop_detach = !in_container;
@@ -341,11 +346,14 @@ int main(int argc, char *argv[]) {
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.");
- log_info("Rebooting with kexec.");
+ /* kexec-tools has a bunch of special code to make Xen Dom0 work,
+ * otherwise it is only doing stuff we have already done.
+ * This is true for Dom0 and DomU but we only get Dom0
+ * because of the !in_container check */
+ if (access("/proc/xen", F_OK) == 0) {
+ pid_t pid;
pid = fork();
if (pid < 0)
@@ -362,7 +370,9 @@ int main(int argc, char *argv[]) {
_exit(EXIT_FAILURE);
} else
wait_for_terminate_and_warn("kexec", pid, true);
- }
+
+ } else
+ reboot(cmd);
cmd = RB_AUTOBOOT;
/* Fall through */
diff --git a/src/shared/fileio.c b/src/shared/fileio.c
index ff6b1a7..0b12dce 100644
--- a/src/shared/fileio.c
+++ b/src/shared/fileio.c
@@ -815,3 +815,72 @@ int get_status_field(const char *filename, const char *pattern, char **field) {
return 0;
}
+
+DIR *opendirat(int dirfd, const char *name) {
+ int fd;
+
+ fd = openat(dirfd, name, O_DIRECTORY);
+ if (fd < 0)
+ return NULL; /*errno is set */
+
+ return fdopendir(fd);
+}
+
+/*
+ * Copyright 1997 Purdue Research Foundation, West Lafayette, Indiana
+ * 47907. All rights reserved.
+ *
+ * Written by Victor A. Abell
+ *
+ * This software is not subject to any license of the American Telephone
+ * and Telegraph Company or the Regents of the University of California.
+ *
+ * Permission is granted to anyone to use this software for any purpose on
+ * any computer system, and to alter it and redistribute it freely, subject
+ * to the following restrictions:
+ *
+ * 1. Neither the authors nor Purdue University are responsible for any
+ * consequences of the use of this software.
+ *
+ * 2. The origin of this software must not be misrepresented, either by
+ * explicit claim or by omission. Credit to the authors and Purdue
+ * University must appear in documentation and sources.
+ *
+ * 3. Altered versions must be plainly marked as such, and must not be
+ * misrepresented as being the original software.
+ *
+ * 4. This notice may not be removed or altered.
+ */
+
+static int fopen_to_open(const char *m) {
+ int flags;
+
+ if (strchr(m, '+'))
+ flags = O_RDWR;
+ else if (m[0] == 'r')
+ flags = O_RDONLY;
+ else if (m[0] == 'w' || m[0] == 'a')
+ flags = O_WRONLY;
+ else
+ return(0);
+
+ if (m[0] == 'a')
+ flags |= O_APPEND|O_CREAT;
+ if (m[0] == 'w')
+ flags |= O_TRUNC|O_CREAT;
+
+ flags |= O_NONBLOCK;
+
+ return flags;
+}
+
+FILE *fopenat(int dirfd, const char *path, const char *mode) {
+ int fd;
+ int flags = fopen_to_open(mode);
+
+ fd = openat(dirfd, path, flags);
+ if (fd < 0)
+ return NULL;
+
+ return fdopen(fd, mode);
+}
diff --git a/src/shared/fileio.h b/src/shared/fileio.h
index 5ae51c1..df174e2 100644
--- a/src/shared/fileio.h
+++ b/src/shared/fileio.h
@@ -22,6 +22,8 @@
***/
#include <stddef.h>
#include <stdio.h>
+#include <sys/types.h>
+#include <dirent.h>
#include "macro.h"
@@ -43,3 +45,6 @@ int write_env_file(const char *fname, char **l);
int executable_is_script(const char *path, char **interpreter);
int get_status_field(const char *filename, const char *pattern, char **field);
+
+DIR *opendirat(int dirfd, const char *name);
+FILE *fopenat(int dirfd, const char *path, const char *mode);
diff --git a/src/shared/missing.h b/src/shared/missing.h
index 802b495..4416a51 100644
--- a/src/shared/missing.h
+++ b/src/shared/missing.h
@@ -36,6 +36,7 @@
#include <linux/audit.h>
#include <linux/capability.h>
#include <linux/neighbour.h>
+#include <linux/kexec.h>
#ifdef HAVE_AUDIT
#include <libaudit.h>
@@ -789,3 +790,13 @@ static inline int kcmp(pid_t pid1, pid_t pid2, int type, unsigned long idx1, uns
#ifndef KCMP_FILE
#define KCMP_FILE 0
#endif
+
+/* v3.17 */
+#ifndef __NR_kexec_file_load
+#ifdef __x86_64__
+#define __NR_kexec_file_load 320
+#endif
+#endif
+#ifndef KEXEC_FILE_NO_INITRAMFS
+#define KEXEC_FILE_NO_INITRAMFS 0x00000004
+#endif
diff --git a/src/shared/rpmvercmp.c b/src/shared/rpmvercmp.c
index c69c2e3..1649929 100644
--- a/src/shared/rpmvercmp.c
+++ b/src/shared/rpmvercmp.c
@@ -13,18 +13,26 @@
/* return 1: a is newer than b */
/* 0: a and b are the same version */
/* -1: b is newer than a */
-int rpmvercmp(const char * a, const char * b)
-{
+int rpmvercmp(const char * a, const char * b) {
+ char oldch1, oldch2;
+ char abuf[strlen(a)+1], bbuf[strlen(b)+1];
+ char *str1 = abuf, *str2 = bbuf;
+ char * one, * two;
+ int rc;
+ int isnum;
+
+ if (!a) {
+ if (b)
+ return -1;
+ else
+ return 0;
+ }
+ if (!b)
+ return 1;
+
/* easy comparison to see if versions are identical */
if (streq_ptr(a, b)) return 0;
- char oldch1, oldch2;
- char abuf[strlen(a)+1], bbuf[strlen(b)+1];
- char *str1 = abuf, *str2 = bbuf;
- char * one, * two;
- int rc;
- int isnum;
-
strcpy(str1, a);
strcpy(str2, b);
diff --git a/src/shared/strv.c b/src/shared/strv.c
index ee45ad1..ed28b95 100644
--- a/src/shared/strv.c
+++ b/src/shared/strv.c
@@ -81,7 +81,14 @@ void strv_clear(char **l) {
}
void strv_free(char **l) {
- strv_clear(l);
+ char **k;
+
+ if (!l)
+ return;
+
+ for (k = l; *k; k++)
+ free(*k);
+
free(l);
}
diff --git a/src/systemctl/bootspec.c b/src/systemctl/bootspec.c
new file mode 100644
index 0000000..8194eaf
--- /dev/null
+++ b/src/systemctl/bootspec.c
@@ -0,0 +1,247 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2015 Shawn Landden
+
+ 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/>.
+***/
+
+/*
+ * Implements http://freedesktop.org/wiki/Specifications/BootLoaderSpec/
+ * for use with kexec
+ */
+
+#include <ctype.h>
+#include <dirent.h>
+#include <sys/utsname.h>
+#include <linux/kexec.h>
+
+#include "bootspec.h"
+#include "strv.h"
+#include "fileio.h"
+#include "rpmvercmp.h"
+
+void bootspec_free(struct BootSpec *s) {
+ if (!s)
+ return;
+
+ free(s->conf);
+ free(s);
+}
+
+static int bootspec_cmp(const void *left, const void *right) {
+ const struct BootSpec *l = left,
+ *r = right;
+
+ /* reverse sort to put highest version first */
+ return rpmvercmp(r->version, l->version);
+}
+
+int bootspec_getkernels(struct BootSpec **ret, size_t *cl, int *bootdir_fd_ret) {
+ int r = 0;
+ struct BootSpec *c;
+ _cleanup_closedir_ DIR *d = NULL;
+ struct dirent *dent;
+ size_t i = 1, ii = 2;
+ _cleanup_close_ int midfd = -1;
+ int bootdir_fd = -1;
+ ssize_t ss;
+ char mid_char[32 + 1];
+ sd_id128_t machine_id;
+
+ assert(ret);
+ assert(cl);
+
+ /* we assume that the EFI partition is mounted
+ * and at /boot/efi or /boot
+ */
+ errno = 0;
+ if (access("/boot/efi/loader/entries", R_OK|X_OK) == 0)
+ bootdir_fd = open("/boot/efi", O_DIRECTORY);
+ else if (access("/boot/loader/entries", R_OK|X_OK) == 0)
+ bootdir_fd = open("/boot", O_DIRECTORY);
+ if (bootdir_fd < 0)
+ return IN_SET(errno, 0, ENOENT) ? 0 : -errno;
+
+ midfd = open("/etc/machine-id", O_RDONLY);
+ if (midfd < 0)
+ return -errno;
+ ss = read(midfd, &mid_char, sizeof(mid_char));
+ if (ss < 0)
+ return -errno;
+ else if (ss != 33)
+ return -EBADF;
+ if (mid_char[32] == '\n')
+ mid_char[32] = '\0';
+ else
+ return -EBADF;
+ r = sd_id128_from_string(mid_char, &machine_id);
+ if (r < 0)
+ return r;
+
+ c = new0(struct BootSpec, i + 1);
+ if (!c)
+ return -ENOMEM;
+
+ d = opendirat(bootdir_fd, "loader/entries");
+ if (!d) {
+ if (errno == ENOENT)
+ return 0;
+ else
+ return -errno;
+ }
+
+ for (dent = readdir(d); dent != NULL; dent = readdir(d)) {
+ struct BootSpec *bs;
+ char *m, *l, *k;
+ _cleanup_fclose_ FILE *f = NULL;
+
+ if (!endswith(dent->d_name, ".conf"))
+ continue;
+
+ c = greedy_realloc0((void **)&c, &ii, i + 2, sizeof(struct BootSpec));
+ if (!c)
+ return -ENOMEM;
+ bs = &c[i - 1];
+
+ f = fopenat(dirfd(d), dent->d_name, "r");
+ if (!f)
+ return -errno;
+
+ r = read_full_stream(f, &bs->conf, NULL);
+ if (r < 0)
+ return r;
+
+ for (m = bs->conf; ; m = k + 1) {
+ if (m[0] == '#')
+ continue;
+
+ k = strchr(m, '\n');
+
+ if (k)
+ *k = '\0';
+ else
+ break;
+
+ if ((l = startswith(m, "title ")))
+ bs->title = l + strspn(l, WHITESPACE);
+ else if ((l = startswith(m, "version ")))
+ bs->version = l + strspn(l, WHITESPACE);
+ else if ((l = startswith(m, "machine-id ")))
+ (void)sd_id128_from_string(l + strspn(l, WHITESPACE), &bs->machine_id);
+ else if ((l = startswith(m, "options ")))
+ bs->options = l + strspn(l, WHITESPACE);
+ else if ((l = startswith(m, "linux ")))
+ bs->linux_loc = l + strspn(l, WHITESPACE);
+ else if ((l = startswith(m, "initrd ")))
+ bs->initrd = l + strspn(l, WHITESPACE);
+ else if ((l = startswith(m, "efi ")))
+ bs->efi = l + strspn(l, WHITESPACE);
+ else if ((l = startswith(m, "devicetree ")))
+ bs->devicetree = l + strspn(l, WHITESPACE);
+ else
+ continue;
+ }
+
+ /* not interested in EFI programs or kernels for other roots */
+ if (!bs->linux_loc || !sd_id128_equal(bs->machine_id, machine_id)) {
+ free(bs->conf);
+ zero(bs);
+ continue;
+ }
+
+ i++;
+ }
+
+ i--;
+
+ qsort(c, i, sizeof(struct BootSpec), bootspec_cmp);
+ *cl = i;
+ *ret = c;
+ if (bootdir_fd_ret)
+ *bootdir_fd_ret = bootdir_fd;
+
+ return r;
+}
+
+int kernel_load(char *version, char *append_cmdline, bool overwrite) {
+ int r = -ENOTSUP;
+
+/* only x86_64 and x32 in 3.18 */
+#ifdef __NR_kexec_file_load
+ if (!overwrite && !kexec_loaded()) {
+ struct utsname u;
+ char *cmdline = NULL;
+ _cleanup_close_ int vmlinuz_fd = -1, initrd_fd = -1, bootdir = -1;
+ struct BootSpec *a = NULL;
+ size_t al = 0;
+ struct BootSpec *c;
+
+ r = uname(&u);
+ if (r < 0)
+ return -errno;
+
+ r = bootspec_getkernels(&a, &al, &bootdir);
+ if (r < 0)
+ return r;
+
+ if (version) {
+ struct BootSpec q;
+
+ q.version = version;
+ c = bsearch(&q, a, al, sizeof(struct BootSpec), bootspec_cmp);
+ if (!c)
+ return -ENOENT;
+ } else
+ c = &a[0];
+
+ cmdline = strjoina(c->options, " ", append_cmdline);
+
+ vmlinuz_fd = openat(bootdir, c->linux_loc, O_RDONLY);
+ if (vmlinuz_fd < 0)
+ return -errno;
+
+ if (c->initrd) {
+ initrd_fd = openat(bootdir, c->initrd, O_RDONLY);
+ if (initrd_fd < 0)
+ return -errno;
+ }
+
+ if (initrd_fd < 0)
+ log_info("kexec: kexec -l %s --command-line=\"%s\"",
+ c->linux_loc,
+ cmdline);
+ else
+ log_info("kexec: kexec -l %s --initrd=%s --command-line=\"%s\"",
+ c->linux_loc,
+ c->initrd,
+ cmdline);
+
+ r = syscall(__NR_kexec_file_load, vmlinuz_fd, initrd_fd,
+ (unsigned long) strlen(cmdline) + 1, cmdline, initrd_fd < 0 ? KEXEC_FILE_NO_INITRAMFS : 0);
+ if (r < 0)
+ return -errno;
+
+ /* free array */
+ for (unsigned i=0;i<al;i++)
+ free((a[i]).conf);
+
+ free(a);
+ } else
+ r = 0;
+#endif
+ return r;
+}
diff --git a/src/systemctl/bootspec.h b/src/systemctl/bootspec.h
new file mode 100644
index 0000000..d8893a0
--- /dev/null
+++ b/src/systemctl/bootspec.h
@@ -0,0 +1,48 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#pragma once
+
+/***
+ This file is part of systemd.
+
+ Copyright 2015 Shawn Landden
+
+ 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 <stdbool.h>
+#include <errno.h>
+
+#include "sd-id128.h"
+
+struct BootSpec {
+ /* The others are just pointers into malloc()ed conf */
+ char *conf;
+
+ char *title;
+ char *version;
+ sd_id128_t machine_id;
+ char *options;
+ char *linux_loc; /* linux is a reserved keyword with gcc! (and clang!)
+ https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65128 */
+ char *initrd;
+ char *efi;
+ char *devicetree;
+};
+
+void bootspec_free(struct BootSpec *l);
+
+/* returns an array of struct BootSpec */
+int bootspec_getkernels(struct BootSpec **a, size_t *l, int *bootdir_fd_ret);
+int kernel_load(char *version, char *append_cmdline, bool overwrite);
diff --git a/src/systemctl/systemctl.c b/src/systemctl/systemctl.c
index 41f7b9f..1f283c8 100644
--- a/src/systemctl/systemctl.c
+++ b/src/systemctl/systemctl.c
@@ -68,6 +68,7 @@
#include "bus-common-errors.h"
#include "mkdir.h"
#include "dropin.h"
+#include "bootspec.h"
static char **arg_types = NULL;
static char **arg_states = NULL;
@@ -222,6 +223,27 @@ static int translate_bus_error_to_exit_status(int r, const sd_bus_error *error)
return EXIT_FAILURE;
}
+static int list_kernels(sd_bus *bus, char **args) {
+ int r;
+ _cleanup_free_ struct BootSpec *a = NULL;
+ size_t al = 0;
+ struct BootSpec *b;
+
+ r = bootspec_getkernels(&a, &al, NULL);
+ if (r < 0) {
+ log_error_errno(r, "Failed to enumerate boot entries: %m");
+ return r;
+ }
+
+ for (unsigned i=0;i<al;i++) {
+ b = &a[i];
+ printf("%s - %s\n", b->version, b->title);
+ free(b->conf);
+ }
+
+ return 0;
+}
+
static void warn_wall(enum action a) {
static const char *table[_ACTION_MAX] = {
[ACTION_HALT] = "The system is going down for system halt NOW!",
@@ -2934,10 +2956,24 @@ static int start_special(sd_bus *bus, char **args) {
return r;
}
+ if (a == ACTION_KEXEC) {
+ char *cmd_append = NULL;
+
+ if (args[1])
+ cmd_append = strv_join(&args[2], " ");
+
+ r = kernel_load(args[1], cmd_append, false);
+ if (r < 0) {
+ log_error_errno(r, "Failed to load kernel: %m");
+ return r;
+ }
+ }
+
if (arg_force >= 2 &&
(a == ACTION_HALT ||
a == ACTION_POWEROFF ||
- a == ACTION_REBOOT))
+ a == ACTION_REBOOT ||
+ a == ACTION_KEXEC))
return halt_now(a);
if (arg_force >= 1 &&
@@ -6038,6 +6074,7 @@ static void systemctl_help(void) {
" daemon-reload Reload systemd manager configuration\n"
" daemon-reexec Reexecute systemd manager\n\n"
"System Commands:\n"
+ " list-kernels List BootLoaderSpec kernels highest version first\n"
" is-system-running Check whether system is fully running\n"
" default Enter system default mode\n"
" rescue Enter system rescue mode\n"
@@ -6045,7 +6082,7 @@ static void systemctl_help(void) {
" halt Shut down and halt the system\n"
" poweroff Shut down and power-off the system\n"
" reboot [ARG] Shut down and reboot the system\n"
- " kexec Shut down and reboot the system with kexec\n"
+ " kexec [VERSION] [CMDLINE...] Shut down and reboot the system with kexec\n"
" exit Request user instance exit\n"
" switch-root ROOT [INIT] Change to a different root file system\n"
" suspend Suspend the system\n"
@@ -6966,6 +7003,7 @@ static int systemctl_main(sd_bus *bus, int argc, char *argv[], int bus_error) {
} bus;
} verbs[] = {
{ "list-units", MORE, 0, list_units },
+ { "list-kernels", EQUAL, 1, list_kernels },
{ "list-unit-files", MORE, 1, list_unit_files, NOBUS },
{ "list-sockets", MORE, 1, list_sockets },
{ "list-timers", MORE, 1, list_timers },
@@ -7004,7 +7042,7 @@ static int systemctl_main(sd_bus *bus, int argc, char *argv[], int bus_error) {
{ "halt", EQUAL, 1, start_special, FORCE },
{ "poweroff", EQUAL, 1, start_special, FORCE },
{ "reboot", MORE, 1, start_special, FORCE },
- { "kexec", EQUAL, 1, start_special },
+ { "kexec", MORE, 1, start_special },
{ "suspend", EQUAL, 1, start_special },
{ "hibernate", EQUAL, 1, start_special },
{ "hybrid-sleep", EQUAL, 1, start_special },
@@ -7222,6 +7260,11 @@ static int halt_now(enum action a) {
reboot(RB_POWER_OFF);
return -errno;
+ case ACTION_KEXEC:
+ log_info("Rebooting via kexec.");
+ reboot(LINUX_REBOOT_CMD_KEXEC);
+ /* fall through */
+
case ACTION_REBOOT: {
_cleanup_free_ char *param = NULL;
@@ -7377,10 +7420,16 @@ int main(int argc, char*argv[]) {
r = systemctl_main(bus, argc, argv, r);
break;
+ case ACTION_KEXEC:
+ r = kernel_load(NULL, NULL, false);
+ if (r < 0) {
+ log_error_errno(r, "Failed to load kernel: %m");
+ goto finish;
+ }
+ /* fall through */
case ACTION_HALT:
case ACTION_POWEROFF:
case ACTION_REBOOT:
- case ACTION_KEXEC:
r = halt_main(bus);
break;
--
2.2.1.209.g41e5f3a
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