Remove the old nextboot from Whistler. AFAIK this hasn't been useable in
quite a while and only works on i386.
This commit is contained in:
Gordon Tetlow
parent
d266a28647
commit
b60563db4e
@ -1,8 +0,0 @@
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# @(#)Makefile 1.1 (Julian Elischer) 3/28/93
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# $FreeBSD$
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PROG= nextboot
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WARNS= 0
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MAN= nextboot.8
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.include <bsd.prog.mk>
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@ -1,116 +0,0 @@
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.\" $FreeBSD$
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.Dd July 9, 1996
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.Dt NEXTBOOT 8
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.Os
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.Sh NAME
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.Nm nextboot
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.Nd install a default bootstring block on the boot disk
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.Sh SYNOPSIS
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.Nm
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.Op Fl b
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.Ar filename bootstring
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.Ar
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.Nm
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.Op Fl ed
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.Ar filename
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.Sh DESCRIPTION
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The
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.Fx
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program
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.Nm
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controls the actions of the boot blocks at the time of the next boot.
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If compiled with the correct option,
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the boot blocks will check the nameblock for a magic number and a
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default name to use for booting.
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If compiled to do so they will also
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delete the name from the block, ensuring that if the boot should fail,
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then it will not be tried again.
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It is the job of
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.Pa /etc/rc
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to use
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.Nm
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to re-install the string if that boot is found to have succeeded.
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This allows a one-time only boot string to be used for such applications
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as remote debugging, and installation of new, untrusted kernels.
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The nameblock is defined at compile time to be the second physical block
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on the disk.
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.Pp
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The following options are available:
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.Bl -tag -width indent
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.It Fl b
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Is used for bootstrapping (initially configuring) the nameblock.
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Without
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this,
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.Nm
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will refuse to write to a block that does not already contain the magic
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number.
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.It Fl d
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Disable (temporarily) an existing name block by changing a bit
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in the magic number.
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.It Fl e
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Restore the good magic number on a block disabled by
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.Fl d .
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.El
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.Pp
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The
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.Fl e
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and
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.Fl d
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flags are mutually exclusive.
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.Sh DESCRIPTION
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.Nm Nextboot
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first checks that the disk has an fdisk table and checks that none of the
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partitions defined in that table include the nameblock.
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If the name block is
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shown to be unused, it will install the bootstrings given as arguments,
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one after the other, each preceded by a small magic number, and NULL
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terminated.
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The end of the list of strings is delimited by a sequence of
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0xff bytes.
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If the boot blocks are compiled to write back the nameblock
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after each boot, it will zero out the supplied names as it uses them,
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one per boot,
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until it reaches the 0xff, at which time it will revert to the compiled in
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boot string.
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At this time the nameblock will contain only zeroed out names.
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.Pp
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An example of usage might be:
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.Bd -literal
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nextboot -b /dev/rwd0 1:sd(0,a)/boot/kernel/kernel.experimental \\
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wd(0,a)/boot/kernel.old/kernel
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.Ed
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.Pp
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Which would instruct the boot blocks at the next boot,
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to try boot the experimental kernel off the SCSI disk.
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If for any reason this failed, the next boot attempt would
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boot the kernel
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.Pa /boot/kernel.old/kernel
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off the IDE drive. (Assuming the write-back option were enabled) If this
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in turn failed.
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The compiled in default would be used.
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.Pp
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If the write-back feature is disabled, the nextboot program is a convenient way
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to change the default boot string.
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Note, that should the file specified in
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the nameblock be non-existent, then the name compiled into the boot blocks
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will be used for the boot rather than the next name in the nameblock.
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The
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nameblock is only consulted
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.Em once
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per boot.
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.Sh SEE ALSO
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.Xr boot 8 ,
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.Xr disklabel 8 ,
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.Xr fdisk 8
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.Sh BUGS
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This program works only in conjunction with the legacy boot code.
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.Pp
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The entire program should be made more user-friendly.
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The option of whether to write back or not should be stored on the
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disk and not a compile time option.
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I want to rethink this at some
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later stage to make it co-exist with disks that do not have
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a fdisk partitioning table (i.e. purely disklabel'd systems).
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.Pp
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Whether to write back or not should be specified at run-time in the nameblock
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so that the boot blocks need not be altered to get this feature.
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@ -1,202 +0,0 @@
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/*
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* Copyright (c) 1996 Whistle Communications
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* Whistle Communications allows free use of this software in its "as is"
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* condition. Whistle Communications disclaims any liability of any kind for
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* any damages whatsoever resulting from the use of this software.
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*/
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#ifndef lint
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/disklabel.h>
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#include <fcntl.h>
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#include <err.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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struct mboot
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{
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unsigned char padding[2]; /* force the longs to be long aligned */
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unsigned char bootinst[DOSPARTOFF];
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struct dos_partition parts[4];
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unsigned short int signature;
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};
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struct mboot mboot;
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#define NAMEBLOCK 1 /* 2nd block */
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#define BLOCKSIZE 512
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#define ENABLE_MAGIC 0xfadefeed
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#define DISABLE_MAGIC 0xfadefade
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static int bflag;
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static int eflag;
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static int dflag;
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#define BOOT_MAGIC 0xAA55
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static void
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usage(void) {
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fprintf (stderr, "%s\n%s\n",
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"usage: nextboot [-b] device bootstring [bootstring] ...",
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" nextboot {-e,-d} device");
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exit(1);
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}
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int
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main (int argc, char** argv)
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{
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int fd = -1;
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char namebuf[1024], *cp = namebuf;
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int i,j;
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int ch;
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int part;
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bflag = 0;
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while ((ch = getopt(argc, argv, "bde")) != -1) {
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switch(ch) {
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case 'b':
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bflag = 1;
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break;
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case 'd':
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dflag = 1;
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break;
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case 'e':
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eflag = 1;
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break;
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case '?':
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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if ( (dflag + eflag + bflag) > 1 ) {
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usage();
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}
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if (dflag + eflag){
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if(argc != 1 ) {
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usage();
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}
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} else {
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if (argc <2) {
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usage();
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}
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}
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if ((fd = open(argv[0], O_RDWR, 0)) < 0)
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errx(1, "can't open %s", argv[0]);
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argc--;
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argv++;
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/*******************************************
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* Check that we have an MBR
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*/
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if (lseek(fd,0,0) == -1)
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err(1, "lseek");
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if (read (fd,&mboot.bootinst[0],BLOCKSIZE ) != BLOCKSIZE)
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err(1, "read0");
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if (mboot.signature != (unsigned short)BOOT_MAGIC)
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errx(1, "no fdisk part.. not touching block 1");
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/*******************************************
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* And check that none of the partitions in it cover the name block;
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*/
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for ( part = 0; part < 4; part++) {
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if( mboot.parts[part].dp_size
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&& (mboot.parts[part].dp_start <= NAMEBLOCK)
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&& (mboot.parts[part].dp_start
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+ mboot.parts[part].dp_size > NAMEBLOCK))
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errx(1,
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"name sector lies within a Bios partition: aborting write");
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}
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/*******************************************
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* Now check the name sector itself to see if it's been initialized.
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*/
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if (lseek(fd,NAMEBLOCK * BLOCKSIZE,0) == -1)
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err(1, "lseek");
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if (read(fd,namebuf,BLOCKSIZE) != BLOCKSIZE)
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err(1, "read1");
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/*******************************************
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* check if we are just enabling or disabling
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* Remember the flags are exclusive..
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*/
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if(!bflag) { /* don't care what's there if bflag is set */
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switch(*(unsigned long *)cp)
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{
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case DISABLE_MAGIC:
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case ENABLE_MAGIC:
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break;
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default:
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errx(1, "namesector not initialized, use the -b flag");
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}
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}
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/*******************************************
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* If the z or r flag is set, damage or restore the magic number..
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* to disable/enable the feature
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*/
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if(dflag) {
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*(unsigned long *)cp = DISABLE_MAGIC;
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} else {
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*(unsigned long *)cp = ENABLE_MAGIC;
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}
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if ((!dflag) && (!eflag)) {
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/*******************************************
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* Create a new namesector in ram
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*/
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cp += 4;
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for ( i = 0 ; i < argc ; i++ ) {
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*cp++ = 'D';
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*cp++ = 'N';
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j = strlen(argv[i]);
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strncpy(cp,argv[i],j);
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cp += j;
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*cp++ = 0;
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}
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*cp++ = 0xff;
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*cp++ = 0xff;
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*cp++ = 0xff;
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namebuf[BLOCKSIZE-1] = 0; /* paranoid */
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namebuf[BLOCKSIZE] = 0xff;
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}
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/*******************************************
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* write it to disk.
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*/
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if (lseek(fd,NAMEBLOCK * BLOCKSIZE,0) == -1)
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err(1, "lseek");
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if(write (fd,namebuf,BLOCKSIZE ) != BLOCKSIZE)
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err(1, "write");
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#if 0
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/*******************************************
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* just to be safe/paranoid.. read it back..
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* and print it..
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*/
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if (lseek(fd,NAMEBLOCK * BLOCKSIZE,0) == -1)
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err(1, "lseek (second)");
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read (fd,namebuf,512);
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for (i = 0;i< 16;i++) {
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for ( j = 0; j < 16; j++) {
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printf("%02x ",(unsigned char )namebuf[(i*16) + j ]);
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}
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printf("\n");
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}
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#endif
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exit(0);
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}
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