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add a new from-scratch (actually, from mkbootimage, but that's close

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enough) implementation of installboot(8) which installs the new file
system specific boot blocks.
This commit is contained in:
cgd 1999-04-05 03:07:37 +00:00
parent 180d6f8b19
commit a50cfa8576
2 changed files with 270 additions and 0 deletions
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5
sys/arch/alpha/stand/installboot/Makefile Normal file
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# $NetBSD: Makefile,v 1.12 1999/04/05 03:07:37 cgd Exp $
PROG= installboot
.include <bsd.prog.mk>

265
sys/arch/alpha/stand/installboot/installboot.c Normal file
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/* $NetBSD: installboot.c,v 1.14 1999/04/05 03:07:37 cgd Exp $ */
/*
* Copyright (c) 1999 Christopher G. Demetriou. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Christopher G. Demetriou
* for the NetBSD Project.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/param.h> /* XXX for roundup, howmany */
#include <sys/stat.h>
#include <sys/disklabel.h>
#include <assert.h>
#include <err.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
static void usage(void);
static void clr_bootstrap(const char *disk);
static void set_bootstrap(const char *disk, const char *bootstrap);
extern char *__progname;
int verbose, nowrite;
static void
usage()
{
fprintf(stderr, "usage:\n");
fprintf(stderr, "\t%s [-n] [-v] disk bootstrap\n", __progname);
fprintf(stderr, "\t%s [-n] [-v] -c disk\n", __progname);
exit(EXIT_FAILURE);
}
int
main(int argc, char **argv)
{
const char *disk, *bootstrap;
int c, clearflag;
clearflag = verbose = nowrite = 0;
while ((c = getopt(argc, argv, "cnv")) != -1) {
switch (c) {
case 'c':
/* Clear any existing boot block */
clearflag = 1;
break;
case 'n':
/* Do not actually write the boot file */
nowrite = 1;
break;
case 'v':
/* Chat */
verbose = 1;
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
if ((clearflag && argc != 1) || (!clearflag && argc != 2))
usage();
disk = argv[0];
bootstrap = argv[1]; /* NULL if argc == 1 */
if (verbose) {
fprintf(stderr, "disk: %s\n", disk);
fprintf(stderr, "bootstrap: %s\n",
bootstrap != NULL ? bootstrap : "to be cleared");
}
if (sizeof (struct boot_block) != BOOT_BLOCK_BLOCKSIZE)
errx(EXIT_FAILURE,
"boot_block structure badly sized (build error)");
if (clearflag)
clr_bootstrap(disk);
else
set_bootstrap(disk, bootstrap);
exit(EXIT_SUCCESS);
}
static void
clr_bootstrap(const char *disk)
{
struct boot_block bb;
u_int64_t cksum;
ssize_t rv;
int diskfd;
if ((diskfd = open(disk, nowrite ? O_RDONLY : O_RDWR)) == -1)
err(EXIT_FAILURE, "open %s", disk);
rv = pread(diskfd, &bb, sizeof bb, BOOT_BLOCK_OFFSET);
if (rv == -1)
err(EXIT_FAILURE, "read %s", disk);
else if (rv != sizeof bb)
errx(EXIT_FAILURE, "read %s: short read", disk);
CHECKSUM_BOOT_BLOCK(&bb, &cksum);
if (cksum != bb.bb_cksum) {
fprintf(stderr,
"old boot block checksum invalid (was %#llx, calculated %#llx)\n",
(unsigned long long)bb.bb_cksum,
(unsigned long long)cksum);
fprintf(stderr, "boot block invalid\n");
goto done;
} else if (verbose) {
fprintf(stderr, "old boot block checksum: %#llx\n",
(unsigned long long)bb.bb_cksum);
fprintf(stderr, "old boot block start sector: %#llx\n",
(unsigned long long)bb.bb_secstart);
fprintf(stderr, "old boot block size: %#llx\n",
(unsigned long long)bb.bb_secsize);
}
bb.bb_secstart = bb.bb_secsize = 0;
CHECKSUM_BOOT_BLOCK(&bb, &bb.bb_cksum);
fprintf(stderr, "new boot block checksum: %#llx\n",
(unsigned long long)bb.bb_cksum);
fprintf(stderr, "new boot block start sector: %#llx\n",
(unsigned long long)bb.bb_secstart);
fprintf(stderr, "new boot block size: %#llx\n",
(unsigned long long)bb.bb_secsize);
if (nowrite) {
if (verbose)
fprintf(stderr, "not writing\n");
goto done;
}
if (verbose)
fprintf(stderr, "writing\n");
rv = pwrite(diskfd, &bb, sizeof bb, BOOT_BLOCK_OFFSET);
if (rv == -1)
err(EXIT_FAILURE, "write %s", disk);
else if (rv != sizeof bb)
errx(EXIT_FAILURE, "write %s: short write", disk);
done:
(void)close(diskfd);
}
static void
set_bootstrap(const char *disk, const char *bootstrap)
{
struct stat bootstrapsb;
struct boot_block bb;
int bootstrapfd, diskfd;
char *bootstrapbuf;
size_t bootstrapsize;
ssize_t rv;
/* Open the input file and check it out */
if ((bootstrapfd = open(bootstrap, O_RDONLY)) == -1)
err(EXIT_FAILURE, "open %s", bootstrap);
if (fstat(bootstrapfd, &bootstrapsb) == -1)
err(EXIT_FAILURE, "fstat %s", bootstrap);
if (!S_ISREG(bootstrapsb.st_mode))
errx(EXIT_FAILURE, "%s must be a regular file", bootstrap);
/*
* Allocate a buffer, with space to round up the input file
* to the next block size boundary, and with space for the boot
* block.
*/
bootstrapsize = roundup(bootstrapsb.st_size, BOOT_BLOCK_BLOCKSIZE);
bootstrapbuf = malloc(bootstrapsize);
if (bootstrapbuf == NULL)
err(EXIT_FAILURE, "allocating buffer to hold bootstrap");
memset(bootstrapbuf, 0, bootstrapsize);
/* read the file into the buffer */
rv = read(bootstrapfd, bootstrapbuf, bootstrapsb.st_size);
if (rv == -1)
err(EXIT_FAILURE, "read %s", bootstrap);
else if (rv != bootstrapsb.st_size)
errx(EXIT_FAILURE, "read %s: short read", bootstrap);
(void)close(bootstrapfd);
if ((diskfd = open(disk, nowrite ? O_RDONLY : O_RDWR)) == -1)
err(EXIT_FAILURE, "open %s", disk);
rv = pread(diskfd, &bb, sizeof bb, BOOT_BLOCK_OFFSET);
if (rv == -1)
err(EXIT_FAILURE, "read %s", disk);
else if (rv != sizeof bb)
errx(EXIT_FAILURE, "read %s: short read", disk);
/* fill in the updated boot block fields, and checksum boot block */
bb.bb_secsize = howmany(bootstrapsb.st_size, BOOT_BLOCK_BLOCKSIZE);
bb.bb_secstart = 1;
CHECKSUM_BOOT_BLOCK(&bb, &bb.bb_cksum);
if (verbose) {
fprintf(stderr, "bootstrap starting sector: %llu\n",
(unsigned long long)bb.bb_secstart);
fprintf(stderr, "bootstrap sector count: %llu\n",
(unsigned long long)bb.bb_secsize);
fprintf(stderr, "new boot block checksum: %#llx\n",
(unsigned long long)bb.bb_cksum);
}
if (nowrite) {
if (verbose)
fprintf(stderr, "not writing\n");
goto done;
}
if (verbose)
fprintf(stderr, "writing bootstrap\n");
rv = pwrite(diskfd, bootstrapbuf, bootstrapsize,
BOOT_BLOCK_OFFSET + BOOT_BLOCK_BLOCKSIZE);
if (rv == -1)
err(EXIT_FAILURE, "write %s", disk);
else if (rv != sizeof bb)
errx(EXIT_FAILURE, "write %s: short write", disk);
if (verbose)
fprintf(stderr, "writing boot block\n");
rv = pwrite(diskfd, &bb, sizeof bb, BOOT_BLOCK_OFFSET);
if (rv == -1)
err(EXIT_FAILURE, "write %s", disk);
else if (rv != sizeof bb)
errx(EXIT_FAILURE, "write %s: short write", disk);
done:
(void)close(diskfd);
}