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| author | Pascal Terjan <pterjan@mandriva.com> | 2009-04-24 19:00:05 +0200 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2009-05-01 11:02:05 -0700 |
| commit | 9a7045801f4dcc4d54f5eeab35018b361cbd45c2 (patch) | |
| tree | 5381b1ae5de297e4838b2c6164f6b6b2e4513aa9 /utils | |
| parent | a54e6fe85a89324e106e4c3d17c3f51c28e4ef4f (diff) | |
| download | syslinux-9a7045801f4dcc4d54f5eeab35018b361cbd45c2.tar.gz | |
isohybrid: preserve MBR id in isohybrid
When running isohybrid again it's nice to preserve the MBR id
There was some partial code to support setting the id using non
existing to_int, but no way to use it.
Signed-off-by: Pascal Terjan <pterjan@mandriva.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'utils')
| -rw-r--r-- | utils/isohybrid.in | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/utils/isohybrid.in b/utils/isohybrid.in index e98c59f6..83f9dc02 100644 --- a/utils/isohybrid.in +++ b/utils/isohybrid.in @@ -100,6 +100,13 @@ if ($c > 1024) { $cc = $c; } +# Preserve id when run again +seek(FILE, 440, SEEK_SET) or die "$0: $file: $!\n"; +read(FILE, $id, 4); +if ($id eq "\x00\x00\x00\x00") { + $id = pack("V", get_random()); +} + # Print the MBR and partition table seek(FILE, 0, SEEK_SET) or die "$0: $file: $!\n"; @@ -117,12 +124,7 @@ if ( length($mbr) > 432 ) { $mbr .= "\0" x (432 - length($mbr)); $mbr .= pack("VV", $de_lba*4, 0); # Offset 432: LBA of isolinux.bin -if (defined($id)) { - $id = to_int($id); -} else { - $id = get_random(); -} -$mbr .= pack("V", $id); # Offset 440: MBR ID +$mbr .= $id; # Offset 440: MBR ID $mbr .= "\0\0"; # Offset 446: actual partition table # Print partition table |