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2009-12-21 Robert Millan <rmh.grub@aybabtu.com>

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* util/mkisofs/msdos_partition.h: New file (based on
        include/grub/msdos_partition.h).
        * util/mkisofs/mkisofs.c (use_protective_msdos_label): New variable.
        (OPTION_PROTECTIVE_MSDOS_LABEL): New macro.
        (ld_options, main): Recognize --protective-msdos-label.
        * util/mkisofs/mkisofs.h (use_protective_msdos_label): New declaration.
        * util/mkisofs/write.c: Include `"msdos_partition.h"'.
        (padblock_write): If `use_protective_msdos_label' is set, patch a
        protective DOS-style label in the output image.

        * util/grub-mkrescue.in: Use --protective-msdos-label.
This commit is contained in:
Robert Millan 2009-12-21 20:22:12 +00:00
parent e930981361
commit 9b214e3a53
6 changed files with 129 additions and 6 deletions
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33
util/mkisofs/write.c
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@ -21,11 +21,10 @@
along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <string.h>
#include <stdlib.h>
#include "config.h"
#include "mkisofs.h"
#include "iso9660.h"
#include <time.h>
#include <errno.h>
@ -37,6 +36,10 @@
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "mkisofs.h"
#include "iso9660.h"
#include "msdos_partition.h"
#ifdef __SVR4
extern char * strdup(const char *);
@ -1424,7 +1427,6 @@ static int FDECL1(dirtree_cleanup, FILE *, outfile)
static int FDECL1(padblock_write, FILE *, outfile)
{
char *buffer;
int i;
buffer = e_malloc (2048 * PADBLOCK_SIZE);
memset (buffer, 0, 2048 * PADBLOCK_SIZE);
@ -1437,6 +1439,29 @@ static int FDECL1(padblock_write, FILE *, outfile)
fread (buffer, 2048 * PADBLOCK_SIZE, 1, fp);
}
if (use_protective_msdos_label)
{
struct msdos_partition_mbr *mbr = (void *) buffer;
memset (mbr->entries, 0, sizeof(mbr->entries));
/* Some idiotic BIOSes refuse to boot if they don't find at least
one partition with active bit set. */
mbr->entries[0].flag = 0x80;
/* Doesn't really matter, as long as it's non-zero. It seems that
0xCD is used elsewhere, so we follow suit. */
mbr->entries[0].type = 0xcd;
/* Start immediately (sector 1). */
mbr->entries[0].start = 1;
/* We don't know yet. Let's keep it safe. */
mbr->entries[0].length = UINT32_MAX;
mbr->signature = MSDOS_PARTITION_SIGNATURE;
}
xfwrite (buffer, 1, 2048 * PADBLOCK_SIZE, outfile);
last_extent_written += PADBLOCK_SIZE;