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add the -x option to extract the filesystem image from the kernel

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This commit is contained in:
dbj 2002-09-26 10:40:59 +00:00
parent 8b125f54cb
commit 2cbb8bc3bf
2 changed files with 66 additions and 25 deletions
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13
gnu/usr.sbin/mdsetimage/mdsetimage.8
View File

@ -1,4 +1,4 @@
.\" $NetBSD: mdsetimage.8,v 1.3 2002/02/23 17:01:20 wiz Exp $
.\" $NetBSD: mdsetimage.8,v 1.4 2002/09/26 10:40:59 dbj Exp $
.\"
.\" Copyright (c) 1996 Christopher G. Demetriou
.\" All rights reserved.
@ -38,6 +38,7 @@
.Op Fl b Ar bfdname
.Op Fl s
.Op Fl v
.Op Fl x
.Ar kernel
.Ar image
.Sh DESCRIPTION
@ -69,6 +70,16 @@ flag is given,
.Nm
will print out status information as
it is copying the image.
.Pp
If the
.Fl x
flag is given,
.Nm
will extract the disk image from
.Ar kernel
into the file
.Ar image .
This is the opposite of the default behavior.
.Sh SEE ALSO
.Xr md 4 ,
.Xr mdconfig 8

56
gnu/usr.sbin/mdsetimage/mdsetimage.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: mdsetimage.c,v 1.7 2002/09/13 15:29:08 thorpej Exp $ */
/* $NetBSD: mdsetimage.c,v 1.8 2002/09/26 10:40:59 dbj Exp $ */
/* from: NetBSD: mdsetimage.c,v 1.15 2001/03/21 23:46:48 cgd Exp $ */
/*
@ -38,7 +38,7 @@ __COPYRIGHT(
#endif /* not lint */
#if defined(__RCSID) && !defined(lint)
__RCSID("$NetBSD: mdsetimage.c,v 1.7 2002/09/13 15:29:08 thorpej Exp $");
__RCSID("$NetBSD: mdsetimage.c,v 1.8 2002/09/26 10:40:59 dbj Exp $");
#endif /* not lint */
#if HAVE_CONFIG_H
@ -78,6 +78,7 @@ static void usage __P((void)) __attribute__((noreturn));
static int find_md_root __P((bfd *, struct symbols symbols[]));
int verbose;
int extract;
int setsize;
static const char *progname;
@ -103,7 +104,7 @@ main(argc, argv)
setprogname(argv[0]);
while ((ch = getopt(argc, argv, "b:sv")) != -1)
while ((ch = getopt(argc, argv, "b:svx")) != -1)
switch (ch) {
case 'b':
bfdname = optarg;
@ -114,6 +115,9 @@ main(argc, argv)
case 'v':
verbose = 1;
break;
case 'x':
extract = 1;
break;
case '?':
default:
usage();
@ -126,8 +130,13 @@ main(argc, argv)
kfile = argv[0];
fsfile = argv[1];
if (extract) {
if ((kfd = open(kfile, O_RDONLY, 0)) == -1)
err(1, "open %s", kfile);
} else {
if ((kfd = open(kfile, O_RDWR, 0)) == -1)
err(1, "open %s", kfile);
}
bfd_init();
if ((abfd = bfd_fdopenr(kfile, bfdname, kfd)) == NULL) {
@ -161,6 +170,11 @@ main(argc, argv)
munmap(mappedkfile, ksb.st_size);
if (extract) {
if ((fsfd = open(fsfile, O_WRONLY|O_CREAT, 0777)) == -1)
err(1, "open %s", fsfile);
left_to_copy = md_root_size;
} else {
if ((fsfd = open(fsfile, O_RDONLY, 0)) == -1)
err(1, "open %s", fsfile);
if (fstat(fsfd, &fssb) == -1)
@ -170,36 +184,52 @@ main(argc, argv)
if (fssb.st_size > md_root_size)
errx(1, "fs image (%lld bytes) too big for buffer (%lu bytes)",
(long long)fssb.st_size, (unsigned long)md_root_size);
left_to_copy = fssb.st_size;
}
if (verbose)
fprintf(stderr, "copying image from %s into %s\n", fsfile,
kfile);
fprintf(stderr, "copying image %s %s %s\n", fsfile,
(extract ? "from" : "into"), kfile);
left_to_copy = fssb.st_size;
if (lseek(kfd, md_root_offset, SEEK_SET) != md_root_offset)
err(1, "seek %s", kfile);
while (left_to_copy > 0) {
char buf[CHUNKSIZE];
ssize_t todo;
int rfd;
int wfd;
const char *rfile;
const char *wfile;
if (extract) {
rfd = kfd;
rfile = kfile;
wfd = fsfd;
wfile = fsfile;
} else {
rfd = fsfd;
rfile = fsfile;
wfd = kfd;
wfile = kfile;
}
todo = (left_to_copy > CHUNKSIZE) ? CHUNKSIZE : left_to_copy;
if ((rv = read(fsfd, buf, todo)) != todo) {
if ((rv = read(rfd, buf, todo)) != todo) {
if (rv == -1)
err(1, "read %s", fsfile);
err(1, "read %s", rfile);
else
errx(1, "unexpected EOF reading %s", fsfile);
errx(1, "unexpected EOF reading %s", rfile);
}
if ((rv = write(kfd, buf, todo)) != todo) {
if ((rv = write(wfd, buf, todo)) != todo) {
if (rv == -1)
err(1, "write %s", kfile);
err(1, "write %s", wfile);
else
errx(1, "short write writing %s", kfile);
errx(1, "short write writing %s", wfile);
}
left_to_copy -= todo;
}
if (verbose)
fprintf(stderr, "done copying image\n");
if (setsize) {
if (setsize && !extract) {
char buf[sizeof(uint32_t)];
if (verbose)