#!/usr/bin/perl
# BEGIN_ICS_COPYRIGHT8 ****************************************
# 
# Copyright (c) 2015, Intel Corporation
# 
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
# 
#     * Redistributions of source code must retain the above copyright notice,
#       this list of conditions and the following disclaimer.
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# END_ICS_COPYRIGHT8   ****************************************

# [ICS VERSION STRING: unknown]
use strict;
#use Term::ANSIColor;
#use Term::ANSIColor qw(:constants);
#use File::Basename;
#use Math::BigInt;

# =============================================================================
# The functions and constants below assist in editing hotplug and blacklists
# to prevent autoloading of drivers prior to startup scripts

my $HOTPLUG_HARDWARE_DIR = "/etc/sysconfig/hardware";

# if not existing file on OS, use this location and create empty file
# code in add_blacklist depends on pre-existance of file
my $HOTPLUG_BLACKLIST_FILE = "/etc/modprobe.d/opa-blacklist.conf";
my $HOTPLUG_BLACKLIST_PREFIX = "blacklist";
my $HOTPLUG_BLACKLIST_SPACE = " ";
my $HOTPLUG_BLACKLIST_SPACE_WILDCARD = "[ 	]*";

# check if the module is blacklisted
sub is_blacklisted($)
{
	my $module = shift();

	my $file = "${HOTPLUG_BLACKLIST_FILE}";
	my $found;

	if (! -f "$file")
	{
		return 0;
	}

	return ! system("grep -q $module $file");
}

# add to list to prevent automatic hotplug of driver
sub add_blacklist($)
{
	my $module = shift();

	my $file = "${HOTPLUG_BLACKLIST_FILE}";
	my $found;

	if (! -e "$file")
	{
		system("touch $file"); # Blacklist file missing, let's create it.
	} elsif (! -f "$file") {
		return; # Blacklist file exists but is not regular file, abort.
	}
	open (INPUT, "$file");
	open (OUTPUT, ">>$TMP_CONF");

	select (OUTPUT);
	while (($_=<INPUT>))
	{
		if (/^${HOTPLUG_BLACKLIST_PREFIX}${HOTPLUG_BLACKLIST_SPACE_WILDCARD}$module[ 	]*$/)
		{
			$found++;
		} 
		print $_;
	}
	if (!defined($found))
	{
		print "${HOTPLUG_BLACKLIST_PREFIX}${HOTPLUG_BLACKLIST_SPACE}$module\n";
	}
	select(STDOUT);

	close (INPUT);
	close (OUTPUT);
	system "mv $TMP_CONF $file";

	# also remove any hotplug config files which load the driver
	open hwconfig, "ls /$HOTPLUG_HARDWARE_DIR/hwcfg* 2>/dev/null |"
			|| Abort "Unable to open pipe\n";
	while (<hwconfig>) {
		chop;
		if ( ! system("grep -q \"MODULE.*'$module'\" $_ 2>/dev/null") ) {
			system "rm -f $_"
		}
	}
	close hwconfig;
}

sub remove_blacklist($)
{
	my($module) = shift();

	my($file) = "${HOTPLUG_BLACKLIST_FILE}";
	if (! -f "$file")
	{
		return;
	}
	open (INPUT, "$file");
	open (OUTPUT, ">>$TMP_CONF");

	select (OUTPUT);
	while (($_=<INPUT>))
	{
		if (/^${HOTPLUG_BLACKLIST_PREFIX}${HOTPLUG_BLACKLIST_SPACE_WILDCARD}$module[ 	]*$/)
		{
			next;
		} else {
			print $_;
		}
	}
	select(STDOUT);

	close (INPUT);
	close (OUTPUT);
	system "mv $TMP_CONF $file";
	if ( -z "$file" ) {
	   system("rm -f $file"); # blacklist file is empty, remove it.
	}
}

