43 lines
1.2 KiB
Text
43 lines
1.2 KiB
Text
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#! /usr/bin/perl -w
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use strict;
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use Fcntl 'SEEK_SET';
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# Read Pintos.pm from the same directory as this program.
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BEGIN { my $self = $0; $self =~ s%/+[^/]*$%%; require "$self/Pintos.pm"; }
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# Get command-line arguments.
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usage (0) if @ARGV == 1 && $ARGV[0] eq '--help';
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usage (1) if @ARGV < 2 || $ARGV[1] ne '--';
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my ($disk, undef, @kernel_args) = @ARGV;
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# Open disk.
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my ($handle);
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open ($handle, '+<', $disk) or die "$disk: open: $!\n";
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# Check that it's a partitioned disk with a Pintos loader.
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my ($buffer) = read_fully ($handle, $disk, 512);
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unpack ("x510 v", $buffer) == 0xaa55 or die "$disk: not a partitioned disk\n";
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$buffer =~ /Pintos/ or die "$disk: does not contain Pintos loader\n";
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# Write the command line.
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our ($LOADER_SIZE);
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sysseek ($handle, $LOADER_SIZE, SEEK_SET) == $LOADER_SIZE
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or die "$disk: seek: $!\n";
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write_fully ($handle, $disk, make_kernel_command_line (@kernel_args));
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# Close disk.
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close ($handle) or die "$disk: close: $!\n";
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exit 0;
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sub usage {
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print <<'EOF';
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pintos-set-cmdline, a utility for changing the command line in Pintos disks
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Usage: pintos-set-cmdline DISK -- [ARGUMENT...]
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where DISK is a bootable disk containing a Pintos loader
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and each ARGUMENT is inserted into the command line written to DISK.
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EOF
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exit ($_[0]);
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}
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