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syslinux/isolinux-config

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#! /usr/bin/perl
#
# Patch new base dir into isolinux.
#
# Makes some assumptions about memory layout in isolinux.
#
use Getopt::Long;
sub help;
$opt_base = undef;
$opt_help = undef;
GetOptions(
'help' => \$opt_help,
'base=s' => \$opt_base,
);
$file = shift;
help if $file eq '' || $opt_help;
open F, $file or die "$file: $!\n";
sysread F, $file_buf, -s($file);
close F;
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if((length $file_buf > (8 << 10)) && ($file_buf =~ m#(/boot(/[\x20-\xff]*)\x00*)\x00isolinux.cfg\x00#s)) {
$format = 1;
}
elsif((length $file_buf > (8 << 10)) && ($file_buf =~ m#(/boot(/[\x20-\xff]*)\x00*)\x00/boot/syslinux\x00#s)) {
$format = 2;
}
die "$file: is not isolinux\n" unless $format;
$start = length $`;
$base_buf = $1;
$old_base = $2;
if(defined $opt_base) {
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($base = $opt_base) =~ s#^/*##;
$base = "/boot/$base";
die "$opt_base: file name too long\n" if length($base) > length($base_buf);
$base_buf = $base . "\x00" x (length($base_buf) - length($base));
substr($file_buf, $start, length($base_buf)) = $base_buf;
open F, ">$file" or die "$file: $!\n";
syswrite F, $file_buf;
close F;
($old_base = $base) =~ s#^/boot##;
}
print "base=$old_base\n";
sub help
{
die
"usage: isolinux-config [options] isolinux_binary\n" .
"Configure isolinux.\n" .
"Options:\n" .
" --base dir\tset isolinux base directory to dir\n" .
" --help\tthis message\n";
}