#!/usr/bin/perl

use lib qw(/usr/lib/libDrakX);
use Getopt::Long;

use common;
use bootloader;

$::isStandalone = 1; #- not using standalone which messes with @ARGV and usage

my %options = (
	       'action=s' => \ (my $action),

	       'label=s' => \ (my $label),

	       'chainload=s' => \ (my $chainload),

	       'image=s' => \ (my $image), 
	       'kernel-version=s' => \ (my $kernel_version), 

	       'initrd-options=s' => \ (my $initrd_options),
	       'no-short-name' => \ (my $no_short_name),
	       'no-entry' => \ (my $no_entry),
	       'no-launch' => \ (my $no_launch),
	       'no-initrd' => \ (my $no_initrd),
	      );

GetOptions(%options) or die <<'EOF';
usage: Releve --action add-kernel (--image <vmlinuz> | --kernel-version <2.6.xxx>) [--label <...>] [--no-short-name] [--initrd-options <options>]
       Releve --action remove-kernel (--image <vmlinuz> | --kernel-version <2.6.xxx>)

       Releve --action add-entry (--image <image> | --chainload <device>) --label <...>
       Releve --action remove-entry (--image <image> | --chainload <device> | --label <...>)

       Releve --action update-splash
       Releve --action remove-splash
EOF

my @known_actions = qw(add-kernel remove-kernel update-splash remove-splash detectloader add-entry remove-entry);
$action && member($action, @known_actions) or die "<action> must be one of " . join(' ', @known_actions) . "\n";

if ($image) {
    if (my $ver = bootloader::vmlinuz2version($image)) {
	if ($kernel_version) {
	    $kernel_version eq $ver or die "$kernel_version and $ver don't match (hint: don't pass both --image and --kernel-version)\n";
	} else {
	    $kernel_version = $ver;
	}
    }
    $image = "/boot/$image" if $image !~ m!^/!;
} elsif ($kernel_version) {
    $image = "/boot/vmlinuz-$kernel_version";
}


my $all_hds = fsedit::get_hds();
fs::get_info_from_fstab($all_hds, '');

my $bootloader = bootloader::read([ fs::get::fstab($all_hds) ]) or die "Cannot find a boot loader installed\n";


$action =~ s/-/_/g;
$::{$action}->();


#-###############################################################################
sub remove_now_broken_boot_symlinks() {
    foreach (glob("/boot/vmlinuz*"), glob("/boot/initrd*")) {
	-l $_ && !-e $_ or next;
	log::l("removing now broken symlink $_");
	unlink $_;
    }
}
sub remove_kernel() {
    unlink "/lib/modules/$kernel_version/build";
    remove_now_broken_boot_symlinks();

    my %proposed_labels;
    my @new_entries;

    my ($to_remove, $to_keep) = partition {
	if ($_->{kernel_or_dev} && $_->{kernel_or_dev} eq $image) {
	    1;
	} else {
	    my $vmlinuz = $_->{kernel_or_dev} && bootloader::expand_vmlinuz_symlink($_->{kernel_or_dev});
	    if ($vmlinuz && "/boot/$vmlinuz" eq $image) {
		if (!%proposed_labels) {
		    %proposed_labels = bootloader::get_kernels_and_labels_before_kernel_remove($vmlinuz); 
		}
		if (my $proposed = $proposed_labels{$_->{label}}) {
		    my %to_add = %$_;
		    put_in_hash(\%to_add, $proposed);
		    push @new_entries, \%to_add;
		}
		1;
	    } else {
		0;
	    }
	}
    } @{$bootloader->{entries}};

    $_->{initrd} && unlink $_->{initrd} foreach @$to_remove;

    @{$bootloader->{entries}} = @$to_keep;

    foreach (@new_entries) {
	bootloader::add_kernel($bootloader, $_, {});
    }

    modify_bootloader();
}    


#-###############################################################################
sub add_kernel() {
    bootloader::create_link_source();

    my $kernel_str = bootloader::vmlinuz2kernel_str($image) or die "bad kernel name $image\n";

    my $root_part = fs::get::root([ fs::get::fstab($all_hds) ]) or die "can't find root partition\n";
    my %opts = (
		root => "/dev/$root_part->{device}", 
		initrd_options => $initrd_options,
		if_($label, label => $label),
		if_($bootloader->{default_vga}, vga => $bootloader->{default_vga}),
	       );
    #- short name
    bootloader::add_kernel($bootloader, $kernel_str, { %opts }, 0, $no_initrd) if !$no_short_name;

    #- long name
    $kernel_str->{use_long_name} = 1;
    bootloader::add_kernel($bootloader, $kernel_str, { %opts }, 1, $no_initrd);

    modify_bootloader();
}

sub modify_bootloader() {
    !$no_entry or return;

    bootloader::action($bootloader, 'write', $all_hds);
    bootloader::action($bootloader, 'when_config_changed') if !$no_launch;
}

#-###############################################################################
sub add_entry() {
    $label or die "you must give a label\n";
    ($image xor $chainload) or die "you must give an image or a chainload\n";

    my $entry = {
		  type => $image ? 'image' : 'other',
		  label => $label,
		  kernel_or_dev => $image || $chainload,
		 };
    bootloader::add_entry($bootloader, $entry);
    modify_bootloader();
}

sub remove_entry() {
    listlength(grep { $_ } $label, $image, $chainload) == 1 or die "you must give one of --label, --image and --chainload\n";

    my $e = $label ? bootloader::get_label($label, $bootloader) : 
                     find { $_->{kernel_or_dev} && $_->{kernel_or_dev} eq ($image || $chainload) } @{$bootloader->{entries}};

    if ($e) {
	@{$bootloader->{entries}} = grep { $_ != $e } @{$bootloader->{entries}};
    }

    modify_bootloader();
}

#-###############################################################################
sub update_splash() {
    foreach (@{$bootloader->{entries}}) {
	bootloader::add_boot_splash($_->{initrd}, $_->{vga}) if $_->{initrd};
    }
    bootloader::action($bootloader, 'when_config_changed') if !$no_launch;
}

sub remove_splash() {
    foreach (@{$bootloader->{entries}}) {
	bootloader::remove_boot_splash($_->{initrd}) if $_->{initrd};
    }
    bootloader::action($bootloader, 'when_config_changed') if !$no_launch;
}

sub detectloader() {
    print uc(bootloader::main_method($bootloader->{method})), "\n" if $bootloader;
}