#!/usr/bin/perl

my $SRCROOT = $ENV{SRCROOT};
my $DSTROOT = $ENV{DSTROOT};

my $SERVERVERSIONPLIST = "/System/Library/CoreServices/ServerVersion.plist";
my $BOOTPLIST = "/Library/Preferences/SystemConfiguration/com.apple.Boot.plist";

my $PLISTBUDDY = "/usr/libexec/PlistBuddy";
my $CHOWN = "/usr/sbin/chown";
my $CHMOD = "/bin/chmod";

# The Boot.plist needs to be processed if we are migrating from a pre-Lion server

if (CheckVersion("${SRCROOT}${SERVERVERSIONPLIST}", "10.7", "ProductVersion", "<")) {
	
	# Boot.plist has already been copied to the destination so we look there
	
	my $bootplistAlreadyExisted = (-e "${DSTROOT}${BOOTPLIST}");
	
	my $kernelFlags = `$PLISTBUDDY -c "print 'Kernel Flags'" "${DSTROOT}${BOOTPLIST}" 2>&1`;
	
	$kernelFlags = "" if $?;
	
	chomp($kernelFlags);
	
	my @kernelFlags = split(/ /, $kernelFlags);
	my @newKernelFlags = ();
	
	foreach my $flag (@kernelFlags) {
		
		# Don't migrate "srv" and "serverperfmode"
		
		if ($flag !~ /^srv=/ && $flag !~ /^serverperfmode=/) {
			
			push(@newKernelFlags, $flag);
		}
	}
	
	# Enable "serverperfmode" by default
	
	push(@newKernelFlags, "serverperfmode=1");
	
	my $newKernelFlags = join(" ", @newKernelFlags);
	
	`$PLISTBUDDY -c "delete 'Kernel Flags'" "${DSTROOT}${BOOTPLIST}" 2>&1`;
	
	`$PLISTBUDDY -c "add 'Kernel Flags' string '${newKernelFlags}'" "${DSTROOT}${BOOTPLIST}" 2>&1`;
	
	# Set default permissions if the Boot.plist didn't already exist
	
	if (!$bootplistAlreadyExisted) {
		
		`$CHOWN root:admin "${DSTROOT}${BOOTPLIST}"`;
		`$CHMOD 644 "${DSTROOT}${BOOTPLIST}"`;
	}
}

sub CheckVersion
{
    my $path            = $_[0];
    my $version         = $_[1];
    my $keyName         = $_[2];
    my $operator        = $_[3];

    if (! -e $path) {
        return 0;
    }

    if (!$operator) {
        $operator = "==";
    }

    my $oldSeperator = $/;
    $/ = \0;

    open( PLIST, "$path") || do {
        return 0;
    };

    $plistData = <PLIST>;
    $plistData =~ /<dict>(.*?)<\/dict>/gis;

    @items = split(/<key>/, $plistData);

    shift @items;
    foreach $item (@items) {
        $item =~ /(.*?)<\/key>.*?<string>(.*?)<\/string>/gis;
        $versiondata{ $1 } = $2;
    }

    close(PLIST);

    $/ = $oldSeperator;

    @theVersionArray = split(/\./, $versiondata{$keyName});
    for ($i = 0; $i < 3; $i++) {
        if(!$theVersionArray[$i]) {
            $theVersionArray[$i] = '0';
        }
    }

    @versionArray = split(/\./, $version);
    
    my $actualVersion;

    for ($i = 0; $i < 3; $i++) {
        if (($theVersionArray[$i] != $versionArray[$i]) or ($i == 2)) {

            $actualVersion = $theVersionArray[$i];
            $version = $versionArray[$i];

            last;
        }
    }

	if( $operator eq  '<' ){ return int($actualVersion)  < int($version); }
	if( $operator eq 'lt' ){ return int($actualVersion)  < int($version); }
	if( $operator eq  '>' ){ return int($actualVersion)  > int($version); }
	if( $operator eq 'gt' ){ return int($actualVersion)  > int($version); }
	if( $operator eq '<=' ){ return int($actualVersion) <= int($version); }
	if( $operator eq 'le' ){ return int($actualVersion) <= int($version); }
	if( $operator eq '>=' ){ return int($actualVersion) >= int($version); }
	if( $operator eq 'ge' ){ return int($actualVersion) >= int($version); }
	if( $operator eq '==' ){ return int($actualVersion) == int($version); }
	if( $operator eq 'eq' ){ return int($actualVersion) == int($version); }
	if( $operator eq '!=' ){ return int($actualVersion) != int($version); }
	if( $operator eq 'ne' ){ return int($actualVersion) != int($version); }
}