#!/usr/bin/perl -w

=head1 NAME

dh_installmodules - register kernel modules

=cut

use strict;
use Debian::Debhelper::Dh_Lib;
use File::Find;

=head1 SYNOPSIS

B<dh_installmodules> [S<I<debhelper options>>] [B<-n>] [B<--name=>I<name>]

=head1 DESCRIPTION

B<dh_installmodules> is a debhelper program that is responsible for
registering kernel modules.

Kernel modules are searched for in the package build directory and if
found, F<preinst>, F<postinst> and F<postrm> commands are automatically generated to
run B<depmod> and register the modules when the package is installed. 
These commands are inserted into the maintainer scripts by
L<dh_installdeb(1)>.

=head1 FILES

=over 4

=item debian/I<package>.modprobe

Installed to etc/modprobe.d/I<package>.conf in the package build directory.

=back

=head1 OPTIONS

=over 4

=item B<-n>, B<--noscripts>

Do not modify F<preinst>/F<postinst>/F<postrm> scripts.

=item B<--name=>I<name>

When this parameter is used, B<dh_installmodules> looks for and
installs files named debian/I<package>.I<name>.modprobe instead
of the usual debian/I<package>.modprobe

=back

=head1 NOTES

Note that this command is not idempotent. L<dh_prep(1)> should be called
between invocations of this command. Otherwise, it may cause multiple
instances of the same text to be added to maintainer scripts.

=cut

init();

# Looks for kernel modules in the passed directory. If any are found,
# returns the kernel version (or versions) that the modules seem to be for.
sub find_kernel_modules {
	my $searchdir=shift;
	my %versions;

	return unless -d $searchdir;
	find(sub {
		if (/\.k?o$/) {
			my ($kvers)=$File::Find::dir=~m!lib/modules/([^/]+)/!;
			if (! defined $kvers || ! length $kvers) {
				warning("Cannot determine kernel version for module $File::Find::name");
			}
			else {
				$versions{$kvers}=1;
			}
		}
	}, $searchdir);

	return keys %versions;
}

# PROMISE: DH NOOP WITHOUT modprobe tmp(lib/modules)

foreach my $package (@{$dh{DOPACKAGES}}) {
	my $tmp=tmpdir($package);
	my $modprobe_file=pkgfile($package,"modprobe");

	if (! -e $tmp) {
		doit("install","-d",$tmp);
	}

	if ($modprobe_file) {
		if (! -e "$tmp/etc/modprobe.d") {
			doit("install","-d","$tmp/etc/modprobe.d");
		}
		my $old="/etc/modprobe.d/".pkgfilename($package);
		my $new=$old.".conf";
		doit("install","-m","0644",$modprobe_file,"$tmp/$new");
		autoscript($package,"preinst","preinst-moveconffile","s!#OLD#!$old!g;s!#PACKAGE#!$package!g");
		autoscript($package,"postinst","postinst-moveconffile","s!#OLD#!$old!g;s!#NEW#!$new!g");
	}
	
	if (! $dh{NOSCRIPTS}) {
		foreach my $kvers (find_kernel_modules("$tmp/lib/modules")) {
			autoscript($package,"postinst","postinst-modules","s/#KVERS#/$kvers/g");
			autoscript($package,"postrm","postrm-modules","s/#KVERS#/$kvers/g");
		}
	}
}

=head1 SEE ALSO

L<debhelper(7)>

This program is a part of debhelper.

=head1 AUTHOR

Joey Hess <joeyh@debian.org>

=cut