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