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Support for writing MBR in the system area, to make hybrid boot images.

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With the specified isolinux option, a MBR is written to the system area, and this 
allows the image to boot from either CD/DVD or USB sticks.

This is also supported on overwriteable media (note that system area is always
overwritten), but it should not work on multisession media.
This commit is contained in:
Vreixo Formoso
2008-10-19 16:03:13 +02:00
parent 7db39f99b6
commit 7e97a45b20
5 changed files with 132 additions and 22 deletions
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21
libisofs/ecma119.c
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@@ -19,6 +19,7 @@
#include "messages.h"
#include "rockridge.h"
#include "util.h"
#include "system_area.h"
#include "libburn/libburn.h"
@@ -784,10 +785,14 @@ void *write_function(void *arg)
target->bytes_written = (off_t) 0;
target->percent_written = 0;
/* Write System Area, 16 blocks of zeros (ECMA-119, 6.2.1) */
memset(buf, 0, BLOCK_SIZE);
for (i = 0; i < 16; ++i) {
res = iso_write(target, buf, BLOCK_SIZE);
/* Write System Area (ECMA-119, 6.2.1) */
{
uint8_t sa[16 * BLOCK_SIZE];
res = iso_write_system_area(target, sa);
if (res < 0) {
goto write_error;
}
res = iso_write(target, sa, 16 * BLOCK_SIZE);
if (res < 0) {
goto write_error;
}
@@ -1054,6 +1059,14 @@ int ecma119_image_new(IsoImage *src, IsoWriteOpts *opts, Ecma119Image **img)
}
}
/* write the system area */
ret = iso_write_system_area(target, opts->overwrite);
if (ret < 0) {
iso_msg_debug(target->image->id,
"Error writing system area to overwrite buffer");
goto target_cleanup;
}
/* skip the first 16 blocks (system area) */
buf = opts->overwrite + 16 * BLOCK_SIZE;
voldesc_size *= BLOCK_SIZE;