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Add a -k option to reboot to specify the kernel to boot next time

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around.  If the kernel boots successfully, the record of this kernel
is erased, it is intended to be a one-shot option for testing
kernels.

This could be improved by having the loader remove the record of
the next kernel to boot, it is currently removed in /etc/rc immediately
after disks are mounted r/w.

I'd like to MFC this before the 4.6 freeze unless there is violent
objection.

Reviewed by:	Several on IRC
MFC after:	4 days
This commit is contained in:
Wes Peters 2002-04-26 07:31:04 +00:00
parent a182065f27
commit 1de372dcd4
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=95485
4 changed files with 39 additions and 6 deletions
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4
etc/rc
View File

@ -314,6 +314,10 @@ if [ -n "${diskless_mount}" -a -r "${diskless_mount}" ]; then
sh ${diskless_mount}
fi
# If we booted a special kernel remove the record so we will boot
# the default kernel next time
rm -f /boot/nextkernel
# Reseed /dev/random with previously stored entropy.
case ${entropy_dir} in
[Nn][Oo])

14
sbin/reboot/reboot.8
View File

@ -44,12 +44,16 @@
.Sh SYNOPSIS
.Nm halt
.Op Fl lnqp
.Op Fl k Ar kernel
.Nm
.Op Fl dlnqp
.Op Fl k Ar kernel
.Nm fasthalt
.Op Fl lnqp
.Op Fl k Ar kernel
.Nm fastboot
.Op Fl dlnqp
.Op Fl k Ar kernel
.Sh DESCRIPTION
The
.Nm halt
@ -72,6 +76,16 @@ The system is requested to create a crash dump. This option is
supported only when rebooting, and it has no effect unless a dump
device has previously been specified with
.Xr dumpon 8 .
.It Fl k Ar kernel
Boot the specified
.Ar kernel
on the next system boot. If the kernel boots successfully, the
.Em default
kernel will be booted on succesive boots, this is a one-shot option.
If the boot fails, the system will continue attempting to boot
.Ar kernel
until the boot process is interrupted and a valid kernel booted.
This may change in the future.
.It Fl l
The halt or reboot is
.Em not

25
sbin/reboot/reboot.c
View File

@ -51,6 +51,7 @@ static const char rcsid[] =
#include <signal.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <libutil.h>
#include <pwd.h>
#include <syslog.h>
@ -68,9 +69,9 @@ int
main(int argc, char *argv[])
{
struct passwd *pw;
int ch, howto, i, lflag, nflag, qflag, pflag, sverrno;
int ch, howto, i, fd, kflag, lflag, nflag, qflag, pflag, sverrno;
u_int pageins;
char *p;
char *kernel, *p;
const char *user;
if (strstr((p = rindex(*argv, '/')) ? p + 1 : *argv, "halt")) {
@ -78,12 +79,16 @@ main(int argc, char *argv[])
howto = RB_HALT;
} else
howto = 0;
lflag = nflag = qflag = 0;
while ((ch = getopt(argc, argv, "dlnpq")) != -1)
kflag = lflag = nflag = qflag = 0;
while ((ch = getopt(argc, argv, "dk:lnpq")) != -1)
switch(ch) {
case 'd':
howto |= RB_DUMP;
break;
case 'k':
kflag = 1;
kernel = optarg;
break;
case 'l':
lflag = 1;
break;
@ -117,6 +122,16 @@ main(int argc, char *argv[])
err(1, NULL);
}
if (kflag) {
fd = open("/boot/nextkernel", O_WRONLY | O_CREAT, 0444);
if (fd > -1) {
(void)write(fd, "kernel=\"", 8L);
(void)write(fd, kernel, strlen(kernel));
(void)write(fd, "\"\n", 2);
close(fd);
}
}
/* Log the reboot. */
if (!lflag) {
if ((user = getlogin()) == NULL)
@ -195,7 +210,7 @@ main(int argc, char *argv[])
void
usage()
{
(void)fprintf(stderr, "usage: %s [-dnpq]\n",
(void)fprintf(stderr, "usage: %s [-dnpq] [-k kernel]\n",
dohalt ? "halt" : "reboot");
exit(1);
}

2
sys/boot/forth/loader.conf
View File

@ -22,7 +22,7 @@ userconfig_script_load="NO"
userconfig_script_name="/boot/kernel.conf"
userconfig_script_type="userconfig_script"
loader_conf_files="/boot/device.hints /boot/loader.conf /boot/loader.conf.local"
loader_conf_files="/boot/device.hints /boot/loader.conf /boot/loader.conf.local /boot/nextkernel"
verbose_loading="NO" # Set to YES for verbose loader output