#!/usr/bin/env perl

# The possible files which getting from local OS that may affect he genimage cross distor level 
#    /proc/self/oom_adj

BEGIN
{
    $::XCATROOT = $ENV{'XCATROOT'} ? $ENV{'XCATROOT'} : '/opt/xcat';
}
use lib "$::XCATROOT/lib/perl";

use File::Basename;
use File::Path;
use File::Copy qw/copy cp mv move/;
use File::Find;
use Getopt::Long;
use Cwd qw(realpath);
use File::Temp qw/mkdtemp/;
use FindBin;
use lib "$FindBin::Bin/../imgutils";
use imgutils;

#use strict;
Getopt::Long::Configure("bundling");
Getopt::Long::Configure("pass_through");

my $dracutmode; #Indicate whether this is a dracut style initrd
my $dracutdir = "dracut";  # The default directory name of dracut
my $prinic; #TODO be flexible on node primary nic
my $othernics; #TODO be flexible on node primary nic
my $netdriver;
my @yumdirs;
my $arch;
my %libhash;
my @filestoadd;
my $profile;
my $osver;
my $pathtofiles=dirname($0);
my $fullpath=realpath($pathtofiles);
my $name = basename($0);
my $onlyinitrd=0;
#that this method of calling genimage is no longer used
if ($name =~ /geninitrd/) {
   $onlyinitrd=1;
}
my $rootlimit;
my $tmplimit;
my $installroot = "/install";
my $kerneldir;
my $kernelver = ""; #`uname -r`;
my $basekernelver; # = $kernelver;
my $customdir=$fullpath;
$customdir =~ s/.*share\/xcat/$installroot\/custom/;
my $imagename;
my $pkglist;
my $srcdir;
my $destdir;
my $srcdir_otherpkgs;
my $otherpkglist;
my $postinstall_filename;
my $rootimg_dir;
my $permission; # the permission works only for statelite mode currently
my $tempfile;
my $prompt;


sub xdie {
   system("rm -rf /tmp/xcatinitrd.$$");
   die @_;
}

$SIG{INT} = $SIG{TERM} = sub { xdie "Interrupted" };
GetOptions(
   'a=s' => \$arch,
   'p=s' => \$profile,
   'o=s' => \$osver,
   'n=s' => \$netdriver,
   'i=s' => \$prinic,
   'r=s' => \$othernics,
   'l=s' => \$rootlimit,
   't=s' => \$tmplimit,
   'k=s' => \$kernelver,
   'permission=s' => \$permission,
   'kerneldir=s' => \$kerneldir,   
   'tempfile=s' =>\$tempfile, #internal flag
   'pkglist=s' => \$pkglist,   #internal flag
   'srcdir=s' => \$srcdir,   #internal flag
   'otherpkgdir=s' => \$srcdir_otherpkgs,  #internal flag
   'otherpkglist=s' => \$otherpkglist,      #internal flag
   'postinstall=s' => \$postinstall_filename,  #internal flag
   'rootimgdir=s' => \$destdir,   #internal flag
   'driverupdatesrc=s' => \$driverupdatesrc, #internal flag
   'interactive' =>\$prompt, 
   'onlyinitrd' =>\$onlyinitrd, 
);

if (@ARGV > 0) {
    $imagename=$ARGV[0];
}

my %updates_os = (); # the hash for updating osimage table
my %updates = (); # the hash for updating linuximage table


$permission = "755" unless ($permission);
$updates{'permission'} = $permission if ( $tempfile );

unless ($arch) {
    $arch = `uname -m`;
    chomp($arch);
	$arch = "x86" if ($arch =~ /i.86$/);
}

$srcdir="$installroot/$osver/$arch" unless ($srcdir);
$updates{'pkgdir'} = $srcdir if ($tempfile);

$srcdir_otherpkgs = "$installroot/post/otherpkgs/$osver/$arch" unless ($srcdir_otherpkgs);
$updates{'otherpkgdir'} = $srcdir_otherpkgs if ($tempfile);

$destdir="$installroot/netboot/$osver/$arch/$profile" unless ($destdir);
$updates{'rootimgdir'} = $destdir if ($tempfile);

$rootimg_dir="$destdir/rootimg";

$kerneldir = "$installroot/kernels" unless ($kerneldir);    # the default directory for 3rd-party kernel is "$installroot/kernels";
#$updates{'kerneldir'} = $kerneldir if ($tempfile);

# Get the subchannels of the given interface
my $subchn;
my $readChn;
my @chn;
if ($arch eq "s390x") {
	$subchn = `cat /etc/sysconfig/network-scripts/ifcfg-$prinic | grep "SUBCHANNELS"`;
 	
 	if (!$subchn) {
 		print "SUBCHANNELS need to be given in /etc/sysconfig/network-scripts/ifcfg-$prinic";
 		exit 1;
 	} else {
 		# Trim right
		$subchn =~ s/\s*$//;

		# Trim left
		$subchn =~ s/^\s*//;
		
		# Extract subchannels
 		$subchn =~ s/SUBCHANNELS=//g;
 		
 		# Extract read channel
 		@chn = split( ",", $subchn );
 		$readChn = @chn[0];
 	}
}

unless ($osver and $profile) {
   usage();
   exit 1;
}

my @ndrivers;
if ($netdriver) {
    foreach (split /,/,$netdriver) {
        if (/^allupdate$/) {
            next;
        }
       unless (/\.ko$/) {
          s/$/.ko/;
       }
       next if (/^$/);
       push @ndrivers, $_;
    }
    
    if ( ($updates{'netdrivers'} ne $netdriver) and ($tempfile) ) {
        $updates{'netdrivers'} = $netdriver;
    }
}

# Use the default list if not specified
unless (@ndrivers) {
    if ($arch eq 'x86' or $arch eq 'x86_64') {
        @ndrivers = qw/tg3 bnx2 bnx2x e1000 e1000e igb mlx_en virtio_net be2net/;
    } elsif ($arch eq 'ppc64') {
        @ndrivers = qw/e1000 e1000e igb ibmveth ehea/;
    } elsif ($arch eq 's390x') {   
    	@ndrivers = qw/qdio ccwgroup/;
    }
}

foreach (@ndrivers) {
   unless (/\.ko$/) {
      s/$/.ko/;
   }
}

unless ($onlyinitrd) {
   @yumdirs=();

   my @pkgdirs = split(",", $srcdir); 
   my $dir;
   foreach $dir (@pkgdirs) {
       find(\&isyumdir, <$dir/>);
       if (!grep /$dir/, @yumdirs) {
           print "The repository for $dir should be created before running the genimge. Try to run [createrepo $dir].\n";
       }
   }

   # Add the dir for kernel rpm to be installed
   if ($kernelver) {
      find(\&isyumdir, <$kerneldir/>);
      if (!grep /$kerneldir/, @yumdirs) {
         print "The repository for $kerneldir should be created before running the genimge. Try to run [createrepo $kerneldir].\n";
      }
   }
   unless (scalar(@yumdirs)) {
      print "Need $installroot/$osver/$arch/ available from a system that has ran copycds on $osver $arch\n";
      exit 1;
   }

   my $yumconfig;
   open($yumconfig,">","/tmp/genimage.$$.yum.conf");
   my $repnum=0;
   foreach $srcdir (@yumdirs) {
      print $yumconfig "[$osver-$arch-$repnum]\nname=$osver-$arch-$repnum\nbaseurl=file://$srcdir\ngpgpcheck=0\n\n";
      $repnum += 1;
   }
   $repnum-=1;
   close($yumconfig);
   mkpath "$rootimg_dir/etc";
   

   my $fd;
   open($fd,">>","$rootimg_dir/etc/fstab");
   print $fd "#Dummy fstab for rpm postscripts to see\n";
   close($fd);

   my $non_interactive;
   if (!$prompt) { $non_interactive="-y"; }

   my $yumcmd = "yum $non_interactive -c /tmp/genimage.$$.yum.conf --installroot=$rootimg_dir/ --disablerepo=* ";
   foreach (0..$repnum) {
      $yumcmd .= "--enablerepo=$osver-$arch-$_ ";
   }
   
   mkpath("$rootimg_dir/var/lib/yum");

   unless ($imagename) {
       $pkglist= imgutils::get_profile_def_filename($osver, $profile, $arch, $customdir, "pkglist");
       unless ($pkglist) {
           $pkglist= imgutils::get_profile_def_filename($osver, $profile, $arch, $pathtofiles, "pkglist");
       }
   }

   if ($pkglist) {
       $updates{'pkglist'} = $pkglist if ($tempfile);
   } else {
       print "Unable to find package list for $profile!";
       exit 1;
   }

   my %pkg_hash=imgutils::get_package_names($pkglist);
   my $index=1;
   my $pass;
    foreach $pass (sort (keys(%pkg_hash))) {
        my $pkgnames = "";
        foreach (keys(%{$pkg_hash{$pass}})) {
            if (($_ eq "PRE_REMOVE") || ($_ eq "POST_REMOVE") || ($_ eq "ENVLIST")) { next;} 
            my $pa=$pkg_hash{$pass}{$_};
            my @npa = ();
            # replace the kernel package with the name has the specific version
            foreach my $p (@$pa) {
                if ($p =~ /^kernel$/ && $kernelver) {
                    my $kernelname = "kernel-".$kernelver;
                    my $searchkern = $yumcmd . " list $kernelname -q";
                    my @kernpkgs = `$searchkern`;
                    my $found = 0;
                    foreach my $k (@kernpkgs) {
                        if ($k =~ /\s*kernel[^\s]*\s+([\w\.-]+)/) {
                            my $version = $1;
                            my $relversion = $kernelver;
                            $relversion =~ s/\.[^\.]+$//;
                            if ($version == $relversion) {
                                $found++;
                            }
                        }
                    }
                    if ($found eq 0) {
                        print "Cannot find the kernel with version $kernelver.\n";
                        exit 1;
                    }
                    push @npa, $kernelname;
                }
                elsif ($p =~ /^@/) {
                    push @npa, "\"$p\"";
                }
                else {
                    push @npa, $p;
                }
            }
            $pkgnames .= " " . join(' ', @npa);
        }
        my $envlist;
        if(exists $pkg_hash{$pass}{ENVLIST}){
            $envlist = join(' ', @{$pkg_hash{$pass}{ENVLIST}});
        }

        print "$envlist $yumcmd install $pkgnames\n";
        my $rc = system("$envlist $yumcmd install $pkgnames");
        if ($rc) { 
            print "yum invocation failed\n";
            exit 1;
        }
    }

   #Now let's handle extra packages
    unless ($imagename) {
        $otherpkglist = imgutils::get_profile_def_filename($osver, $profile, $arch, $customdir, "otherpkgs.pkglist");
        unless ($otherpkglist) { $otherpkglist=imgutils::get_profile_def_filename($osver, $profile, $arch, $pathtofiles, "otherpkgs.pkglist"); }
    }
    my %extra_hash=();
    if ($otherpkglist) {
        $updates{'otherpkglist'} = $otherpkglist if ($tempfile);
        %extra_hash = imgutils::get_package_names($otherpkglist);
    }
    my %extrapkgnames; 

    if (keys(%extra_hash) > 0) {
      open($yumconfig,">>","/tmp/genimage.$$.yum.conf");
      my $index=1;
      foreach $pass (sort (keys(%extra_hash))) {
        foreach (keys(%{$extra_hash{$pass}})) {
            if (($_ eq "PRE_REMOVE") || ($_ eq "POST_REMOVE") || ($_ eq "ENVLIST")) { next;} 
            print $yumconfig "[otherpkgs$index]\nname=otherpkgs$index\nbaseurl=file://$srcdir_otherpkgs/$_\ngpgpcheck=0\n\n";
            $index++;
            my $pa=$extra_hash{$pass}{$_};
            $extrapkgnames{$pass} .= " " . join(' ', @$pa);
        }
      }
      close($yumconfig);
      $index--;
      $yumcmd = "yum $non_interactive -c /tmp/genimage.$$.yum.conf --installroot=$rootimg_dir/ --disablerepo=* ";
      foreach (0..$repnum) {
          $yumcmd .= "--enablerepo=$osver-$arch-$_ ";
      }
      for (1..$index) {
          $yumcmd .= "--enablerepo=otherpkgs$_ ";
      } 

      foreach $pass (sort (keys(%extra_hash))) {
          my $envlist;
          if(exists($extra_hash{$pass}{ENVLIST})){
              $envlist = join(' ', @{$extra_hash{$pass}{ENVLIST}});
          }
          # remove the packages that are specified in the otherpkgs.list files with leading '-'
          my $yumcmd_remove= "$yumcmd erase ";
          if (exists ($extra_hash{$pass}{'PRE_REMOVE'})) {
              my $pa=$extra_hash{$pass}{'PRE_REMOVE'};
              my $rm_packges= join(' ', @$pa);
              if ($rm_packges) {
                  print "$envlist $yumcmd_remove $rm_packges\n";
                  $rc = system("$envlist $yumcmd_remove $rm_packges");
              }
          }

#          # mount /proc file system since several packages need it.
#          print "mount /proc file system\nchroot $rootimg_dir /bin/mount -t proc proc /proc\n";
#          system("chroot $rootimg_dir /bin/mount -t proc proc /proc");

          # install extra packages
          my $yumcmd_base = $yumcmd;
          $yumcmd .= "install ";
          # append extra pkg names to yum command 
          if ($extrapkgnames{$pass}) {
              $yumcmd .= " $extrapkgnames{$pass} ";
	      $yumcmd =~ s/ $/\n/;
    
	      # debug
	      #print "yumcmd=$yumcmd\n";
	      #my $repo=`cat /tmp/genimage.$$.yum.conf`;
	      #print "repo=$repo";
	      
	      print "$envlist $yumcmd\n"; 
	      my $rc = system("$envlist $yumcmd");
	      if ($rc) { 
		  print "yum invocation failed\n";
		  exit 1;
	      }
          } else {
	      print "No Packages marked for install\n";
          }

#          # umount /proc file system that just mounted
#          print "umount /proc file system\nchroot $rootimg_dir /bin/umount /proc\n";
#          system("chroot $rootimg_dir /bin/umount /proc");
	
          # remove the packages that are specified in the otherpkgs.list files with leading '--'
          if (exists ($extra_hash{$pass}{'POST_REMOVE'})) {
              my $pa=$extra_hash{$pass}{'POST_REMOVE'};
              my $rm_packges= join(' ', @$pa);
              if ($rm_packges) {
                  print "$envlist $yumcmd_remove $rm_packges\n";
                  $rc = system("$envlist $yumcmd_remove $rm_packges");
              }
          }
          $yumcmd = $yumcmd_base;
      }
   }

   # run yum update to update any installed rpms
   # needed when running genimage again after updating software in repositories
   my $yumcmd_update = $yumcmd_base . " update  ";
   $rc = system("$yumcmd_update");
   # ignore any return code

   postscripts(); #run 'postscripts'
}

#get the rpm version, if the rpm version is different then the db verison may change.
my $mnrpmver = `rpm --version | awk  '{print \$3}'`;
my $cnrpmver = `chroot $rootimg_dir rpm --version | awk '{print \$3}'`;
if ( $mnrpmver ne $cnrpmver ){
    #fine all db file witch should be rebuided
    my $filelist = `file $rootimg_dir/var/lib/rpm/* | grep 'Berkeley DB' | awk -F : '{print \$1}'`;

    my @files = split '\n', $filelist;

    system("rm -rf $rootimg_dir/var/lib/rpm/__db*");
    foreach  my $file ( @files ){
        my $filename = basename($file);
        #dump the db file to a normal test file with the db_dump on the mn
        system("db_dump $file > $rootimg_dir/tmp/$filename.dbtmp9");
        unlink("$rootimg_dir/var/lib/rpm/$filename");
        #chroot to the rootimage and run db_load
        system(" chroot $rootimg_dir db_load -f /tmp/$filename.dbtmp9 /var/lib/rpm/$filename");
    }
    system("rm -rf $rootimg_dir/tmp/*.dbtmp9");
    #rebuild rpm db file in rootimage for cn
    system(" chroot $rootimg_dir rpm --rebuilddb");
}

# Default to the first kernel found in the install image if nothing specified explicitly.
# A more accurate guess than whatever the image build server happens to be running
# If specified, that takes precedence.
# if image has one, that is used
# if all else fails, resort to uname -r like this script did before

# Kernel name for s390x should be the same: vmlinuz-2.6.18-164.el5
my @KVERS= <$rootimg_dir/boot/vmlinuz-*>;
foreach (@KVERS) {
    s/vmlinuz-//;
}

@KVERS= <$rootimg_dir/lib/modules/*> unless (scalar(@KVERS));

$basekernelver = basename(pop @KVERS) if (scalar(@KVERS));

$basekernelver = `uname -r` unless ($basekernelver);

$kernelver = $basekernelver unless ($kernelver);
chomp($kernelver);

#$updates{'kernelver'} = $kernelver if ($tempfile);

# copy the kernel to $destdir
if ( -e "$rootimg_dir/boot/vmlinux-$kernelver") {
    cp("$rootimg_dir/boot/vmlinux-$kernelver", "$destdir/kernel");
} elsif ( -e "$rootimg_dir/boot/vmlinuz-$kernelver") {
    cp("$rootimg_dir/boot/vmlinuz-$kernelver", "$destdir/kernel");
} elsif ( -e "$rootimg_dir/boot/image-$kernelver") {
    cp("$rootimg_dir/boot/image-$kernelver", "$destdir/kernel");
} else {
    xdie("couldn't find the kernel file matched $kernelver in $rootimg_dir/boot");
}

# Load driver update disk, and copy them to the root image
my @dd_drivers = &load_dd();

# Push the drivers into the @ndrivers base on the order
my @new_order = ();
foreach my $dd (@dd_drivers) {
    unless (grep { $_ eq $dd} @ndrivers) {
        push @new_order, $dd;
    }
    print "Added driver $dd from driver update disk or driver rpm\n";
}

foreach my $driver (@ndrivers) {
    print "Added driver $driver from root image\n";
}

if (@new_order) {
    @ndrivers = (@new_order, @ndrivers);
}

open($moddeps,"<","$rootimg_dir/lib/modules/$kernelver/modules.dep");
my @moddeps = <$moddeps>;
my @checkdeps = @ndrivers;
while (scalar @checkdeps) {
    my $driver = pop @checkdeps;
    my @lines = grep /\/$driver:/,@moddeps;
    foreach (@lines) {
        chomp;
        s/.*://;
        s/^\s*//;
        my @deps = split /\s+/,$_;
        my $dep;
        foreach $dep (@deps) {
            $dep =~ s/.*\///;
            unless (grep { $_ eq $dep } @ndrivers) { #only add if not added
                unshift (@checkdeps,$dep); #recursively check dependencies
                unshift (@ndrivers,$dep);
                print "Added $dep as an autodetected depedency\n";
            }
        }
    }
}
close($moddeps);
unlink "/tmp/genimage.$$.yum.conf";
if (-d "$rootimg_dir/usr/share/dracut") {
    $dracutmode = 1;
    # get dracut version
    my $dracutver = `rpm --root $rootimg_dir -qi dracut | grep Version | awk -F' ' '{print \$3}'`;
    chomp($dracutver);
    if ($dracutver =~ /^\d\d\d$/) {
        if ($dracutver >= "009") {
            $dracutdir = "dracut_009";
        } else {
            $dracutdir = "dracut";  # The default directory
        }
    }
    print "Enter the dracut mode. Dracut version: $dracutver. Dracut directory: $dracutdir.\n";
}

#-- run postinstall script
unless ($imagename) {
    $postinstall_filename= imgutils::get_profile_def_filename($osver, $profile, $arch, $customdir, "postinstall");
    unless ($postinstall_filename) {
        $postinstall_filename= imgutils::get_profile_def_filename($osver, $profile, $arch, $pathtofiles, "postinstall");
    }
} 

if ( $postinstall_filename ) {

    #For Mellonax IB script. In diskless image, the uname -r not returning the rootimg level, 
    #because the "uname -r" only returns the version of the kernel in use
    #create a temporary uname script. for every flag except for -r, it should just call the real 
    #uname with the same flags and return that info.
    if(!( -e "$rootimg_dir/bin/orig_uname")) {
        system("mv $rootimg_dir/bin/uname $rootimg_dir/bin/orig_uname");
    }
    my $tmpuname;
    open($tmpuname,">","$rootimg_dir/bin/uname");
    print $tmpuname <<EOS_UNAME;
#!/bin/sh

if [[ \$\# -eq 1 && \$1 == "-r" ]]; then
    echo $kernelver
    exit 0
fi

res=`/bin/orig_uname \$\*`
echo \$res

EOS_UNAME

    close($tmpuname);
    system("chmod +x $rootimg_dir/bin/uname");


    $updates{'postinstall'} = $postinstall_filename if ($tempfile);

    foreach my $postinstall ( split /,/, $postinstall_filename ) {
        if ( !-x $postinstall ) {
            print "postinstall script $postinstall is not executable\n";
            exit 1;
        }
        my $rc = system($postinstall, $rootimg_dir,$osver,$arch,$profile);
        if($rc) {
            print "postinstall script $postinstall failed\n";
            exit 1;
        }
    }
    # restore the orig uname
    system("mv $rootimg_dir/bin/orig_uname $rootimg_dir/bin/uname");

}

# all the attributes have been gathered
# now, update the linuximage and osimage tables
# TODO: do statelite and stateless share the same attributes?
#BEGIN: PLEASE DO NOT CHANGE THE FOLLOWING CODE, genimage PLUGIN NEEDS TO PARSE THR OUTPUT
if ($tempfile) {
    open(FILE, ">>$tempfile");
    if ($imagename) {
	if (keys(%updates) > 0) {
	    print FILE "The output for table updates starts here\n";
	    print FILE "table::linuximage\n";
	    print FILE "imagename::$imagename\n";
	    my @a=%updates;
	    print FILE join('::',@a) . "\n";
	    print FILE "The output for table updates ends here\n";
	}
    } else {
	$updates_os{'profile'} = $profile;
	$updates_os{'imagetype'} = 'linux';
	$updates_os{'provmethod'} = 'netboot';
	$updates_os{'osname'} = 'Linux';
	$updates_os{'osvers'} = $osver;
	$updates_os{'osarch'} = $arch;
	# update the imagename for stateless 
	print FILE "The output for table updates starts here\n";
	print FILE "table::osimage\n";
	print FILE "imagename::$osver-$arch-netboot-$profile\n";
	my @a=%updates_os;
	print FILE join('::',@a) . "\n";
	print FILE "The output for table updates ends here\n";
	
	print FILE "The output for table updates starts here\n";
	print FILE "table::linuximage\n";
	print FILE "imagename::$osver-$arch-netboot-$profile\n";
	my @a=%updates;
	print FILE join('::',@a) . "\n";
	print FILE "The output for table updates ends here\n";
	
	# update the imagename for statelite   
	$updates_os{'provmethod'} = 'statelite';
	print FILE "The output for table updates starts here\n";
	print FILE "table::osimage\n";
	print FILE "imagename::$osver-$arch-statelite-$profile\n";
	my @a=%updates_os;
	print FILE join('::',@a) . "\n";
	print FILE "The output for table updates ends here\n";
	
	print FILE "The output for table updates starts here\n";
	print FILE "table::linuximage\n";
	print FILE "imagename::$osver-$arch-statelite-$profile\n";
	my @a=%updates;
	print FILE join('::',@a) . "\n";
	print FILE "The output for table updates ends here\n";
    }
    close FILE;
}
#END


# statelite .statelite directory added here.
# this is where tmpfs will be created.

mkpath "$rootimg_dir/.statelite";  # create place for NFS mounts.	

# this script will get the directories.	
# TODO: the file is re-copied in liteimg.pm
my $cwd = $FindBin::Bin;
unless (-f "$cwd/../add-on/statelite/rc.statelite") {
	print "Can't find $cwd/../add-on/statelite/rc.statelite!\n";
	exit 1;
}

system("cp $cwd/../add-on/statelite/rc.statelite $rootimg_dir/etc/init.d/statelite");
system("cp $cwd/../add-on/statelite/rc.localdisk $rootimg_dir/etc/init.d/localdisk");
# also need to add this file:
# may have already been made into a symbolic link, if so ignore it

unless ($dracutmode) { #in dracut mode, we delegate all this activity
    unless (-l "$rootimg_dir/var/lib/dhclient" ) {
    	mkpath "$rootimg_dir/var/lib/dhclient/";
    	system("touch $rootimg_dir/var/lib/dhclient/dhclient-$prinic.leases");
    }
    
    unless (-l "$rootimg_dir/var/lib/dhcp" ) {
    	mkpath "$rootimg_dir/var/lib/dhcp/";
    	system("touch $rootimg_dir/var/lib/dhcp/dhclient-$prinic.leases");
    }
}

#if ($dracutmode) {
    # modify etc/rc.sysinit, prevent remounting
    # TODO: need to find one way to prevent remounting
    if (-f "$rootimg_dir/etc/rc.sysinit") {
        my $SYSINITFILE;
        my $TMPSYSINITFILE;
        # backup etc/rc.sysinit file before modifing it
        system("cp -a $rootimg_dir/etc/rc.sysinit $rootimg_dir/etc/rc.sysinit.backup");
        open($SYSINITFILE, "$rootimg_dir/etc/rc.sysinit");
        open($TMPSYSINITFILE, '>', "/tmp/rc.sysinit.tmp");
        # find the following lines,
        # if remount_needed ; then
        #   action $"Remounting root filesystem in read-write mode: " mount -n -o remount,rw /
        # fi
        # and change "if remount_needed ; then" to "if false; then"
        while(<$SYSINITFILE>) {
            if ($_ eq "if remount_needed ; then\n") {
                $_ = "if false; then\n";
            }
            print $TMPSYSINITFILE $_;
        }
        close($SYSINITFILE);
        close($TMPSYSINITFILE);
        cp("/tmp/rc.sysinit.tmp", "$rootimg_dir/etc/rc.sysinit");
    }
#}

# before mkinitrd, run depmod to generate modules.dep 
system("chroot $rootimg_dir depmod $kernelver");

# for the genimage-enchement, need to create two initial ramdisks,
# one is for stateless
# the other one is for statelite

if ($dracutmode) {
    mkinitrd_dracut("statelite");
    mkinitrd_dracut("stateless");
} else {
    mkinitrd("statelite");
    mkinitrd("stateless");
}

sub getlibs {
    my $file = shift;
    my $liblist = `chroot $rootimg_dir ldd $file`;
    if ($liblist =~ /not a dynamic executable/) {
        return;
    }
    my @libs = split/\n/,$liblist;
    my @return;
    foreach (@libs) {
        unless (/=>/) {
            (my $wjnk, my $lib,my $jnk) = split /\s+/,$_,3;
            $lib =~ s/^\///;
            $libhash{$lib}=1;
            next;
        }
        (my $temp1,my $temp2) = split />/,$_,2;
        (my $whitespace,$temp1,$temp2) = split /\s+/,$temp2,4;
        unless ($temp1 =~ /\//) {
            next;
        }
        $temp1 =~ s/^\///;
        $libhash{$temp1}=1;
   }
}

sub mkinitrd_dracut {
    my ($mode) = @_; # the mode is for statelite or stateless
    my $dracutmpath = "$rootimg_dir/usr/share/dracut/modules.d/97xcat";
    mkpath($dracutmpath);

    my $perm = (stat("$fullpath/$dracutdir/check"))[2];
    cp("$fullpath/$dracutdir/check", $dracutmpath);
    chmod($perm&07777, "$dracutmpath/check");

    foreach (@ndrivers) { s/\.ko$//; }
    # Add drivers to support local disk
    push @ndrivers, "ext3";
    push @ndrivers, "ext4";
    my $add_drivers = join(' ', @ndrivers);
    my $DRACUTCONF;

    if ($mode eq "statelite") {
        # for statelite
        cp("$fullpath/$dracutdir/install.statelite","$dracutmpath/install");
        $perm = (stat("$fullpath/$dracutdir/install.statelite"))[2];
        chmod($perm&07777, "$dracutmpath/install");

        cp("$fullpath/$dracutdir/xcat-prepivot.sh",$dracutmpath);
        $perm = (stat("$fullpath/$dracutdir/xcat-prepivot.sh"))[2];
        chmod($perm&07777, "$dracutmpath/xcat-prepivot.sh");

        # update etc/dracut.conf
        open($DRACUTCONF, '>', "$rootimg_dir/etc/dracut.conf");
        if (-d glob("$rootimg_dir/usr/share/dracut/modules.d/[0-9]*fadump")){
            print $DRACUTCONF qq{dracutmodules+="xcat nfs base network kernel-modules fadump"\n};
        }
        else{
            print $DRACUTCONF qq{dracutmodules+="xcat nfs base network kernel-modules"\n};
        }
        print $DRACUTCONF qq{add_drivers+="$add_drivers"\n};
        print $DRACUTCONF qq{filesystems+="nfs"\n};
        close $DRACUTCONF;
    } elsif ($mode eq "stateless") {
        cp("$fullpath/$dracutdir/install.netboot","$dracutmpath/install");
        $perm = (stat("$fullpath/$dracutdir/install.netboot"))[2];
        chmod($perm&07777, "$dracutmpath/install");

        cp("$fullpath/$dracutdir/xcat-cmdline.sh","$dracutmpath/");
        $perm = (stat("$fullpath/$dracutdir/xcat-cmdline.sh"))[2];
        chmod($perm&07777, "$dracutmpath/xcat-cmdline.sh");

        if ($prinic) {
            my $optspec;
            open($optspec,'>>',"$dracutmpath/xcat-cmdline.sh");
            print $optspec "PRINIC=$prinic\n";
            close $optspec;
        }

        cp("$fullpath/$dracutdir/xcatroot","$dracutmpath/");
        $perm = (stat("$fullpath/$dracutdir/xcatroot"))[2];
        chmod($perm&07777, "$dracutmpath/xcatroot");

        cp("$fullpath/$dracutdir/installkernel", "$dracutmpath/");
        $perm = (stat("$fullpath/$dracutdir/installkernel"))[2];
        chmod($perm&07777, "$dracutmpath/installkernel");

        # update etc/dracut.conf
        open($DRACUTCONF, '>', "$rootimg_dir/etc/dracut.conf");
        if (-d glob("$rootimg_dir/usr/share/dracut/modules.d/[0-9]*fadump")){
            print $DRACUTCONF qq{dracutmodules+="xcat nfs base network kernel-modules fadump"\n};
        }
        else{
            print $DRACUTCONF qq{dracutmodules+="xcat nfs base network kernel-modules"\n};
        }
        print $DRACUTCONF qq{add_drivers+="$add_drivers"\n};
        close $DRACUTCONF;
    } else {
        xdie "the mode: $mode is not supported by genimage";
    }

    my $additional_options=undef;
    if($rootlimit)
    {
	open(my $ETC_CMDLINE,">","$rootimg_dir/tmp/cmdline");
	print $ETC_CMDLINE qq{rootlimit=$rootlimit\n};
	close $ETC_CMDLINE;
	$additional_options= qq{--include /tmp/cmdline /etc/cmdline};
    }

    system("chroot $rootimg_dir dracut $additional_options -f /tmp/initrd.$$.gz $kernelver");
    print "the initial ramdisk for $mode is generated successfully.\n";
    move("$rootimg_dir/tmp/initrd.$$.gz", "$destdir/initrd-$mode.gz"); 
}

sub mkinitrd {
    my ($mode) = @_; # statelite or stateless

    if($mode eq "statelite") {
        push @ndrivers, "nfs.ko";

        open($moddeps,"<","$rootimg_dir/lib/modules/$kernelver/modules.dep");
        my @moddeps = <$moddeps>;
        my @checkdeps = ("nfs.ko");
        while (scalar @checkdeps) {
            my $driver = pop @checkdeps;
            my @lines = grep /\/$driver:/,@moddeps;
            foreach (@lines) {
                chomp;
                s/.*://;
                s/^\s*//;
                my @deps = split /\s+/,$_;
                my $dep;
                foreach $dep (@deps) {
                    $dep =~ s/.*\///;
                    unless (grep { $_ eq $dep } @ndrivers) { #only add if not added
                        unshift (@checkdeps,$dep); #recursively check dependencies
                        unshift (@ndrivers,$dep);
                        print "Added $dep as an autodetected depedency\n";
                    }
                }
            }
        }
    
        # Additional modules needed on s390x
        if ($arch eq "s390x") {
            # The network drivers need to be loaded in this order
            unshift @ndrivers, "ccwgroup.ko";
            unshift @ndrivers, "qdio.ko";
        }
    }
    
	mkpath("/tmp/xcatinitrd.$$/bin");
	
    symlink("bin","/tmp/xcatinitrd.$$/sbin");
	mkpath("/tmp/xcatinitrd.$$/usr/bin");
	mkpath("/tmp/xcatinitrd.$$/usr/sbin");
	mkpath("/tmp/xcatinitrd.$$/usr/lib");
	mkpath("/tmp/xcatinitrd.$$/usr/lib64");
	mkpath("/tmp/xcatinitrd.$$/lib/firmware");
	mkpath("/tmp/xcatinitrd.$$/lib64/firmware");
	mkpath("/tmp/xcatinitrd.$$/proc");
	mkpath("/tmp/xcatinitrd.$$/sys");
	mkpath("/tmp/xcatinitrd.$$/dev/mapper");
	mkpath("/tmp/xcatinitrd.$$/sysroot");
	mkpath("/tmp/xcatinitrd.$$/etc/ld.so.conf.d");
	mkpath("/tmp/xcatinitrd.$$/var/lib/dhclient");
	my $inifile;

# start writing to the init script.
	open($inifile,">","/tmp/xcatinitrd.$$/init");
	print $inifile "#!/sbin/busybox.anaconda sh\n";
	
# add some functions
 	print $inifile <<EOS1; 	
NEWROOT="/sysroot"
SHELL="/bin/sh"
RWDIR=".statelite"


# Define some colors
RESET="\033[0m"
RED="\033[31m"
CYAN="\033[36m"
YELLOW="\033[33m\033[1m"
GREEN="\033[32m"
PINK="\033[35m\033[1m"
MAGENTA="\033[35m"
BROWN="\033[33m"
NORMAL=\$RESET

# This function is used to mount files/directories from the .statelite directory 
#  over the root directory.
# This function is stolen from redhat
shell() {
        echo ''
        echo -e "\$YELLOW Entering rescue/debug init shell."
        echo -e " Exit shell to continue booting.\$RESET"
        \$SHELL
}

fancydisplay () {
        clear
        echo -e "\$CYAN"
echo '
             ..                                               :iiii,
           :tLL;                                             .,:...,.
          .j;:tLt.   :.                               .;j:   ij::::;.
        :tt;:::,ii:.jEEGi                           :tDEEG:.ti,::::;t:
       .,,,,,,,,,,,tLEEEEj:                        tDEEEEDtj;,,,::::::
        .:,,::::::,;fDEEEEEL,.                .,ijDEDDDEEGt,,,,:,ijj;
          ....   ..:;jDDLGDEEEGGGfjjjjjjfffLGDEEDEEDLjfGDt,:..
                     .iftffGDLLDEEEDDDEEDDDDEDEEGLfLjjtti:
                       ,fii;jGDGffLjifLGLjtfffffGDEDGfji
                        ;DEEGffDDDjiii;;ii;,tGDEGjfEEEEf.
                       ,GEGGftiGEEEDt:,;,;;LEEDGjLEEEEEEG
                      ;DEDGjtjfitjGGjfDGj;jLLiitfGDEGjEEDj
                      fGjjtfLfji;itjfGDjLDfjjjji;tGGLDEEDj
                      fEDGffjti;ittjjjjtjjjjt:,,iiGGGGjtf.
                      :fGGLfLLfLGf;i;ijffj,,tjLGDDGLfjtf,
                    :;tLfjiiffLGDDDGLGEEEEjfGDDGGLfjfff:
             .. ,;tLLLLLL,;tijfLGGGjfDEEEEDLLGGGLLLjtjLLfi,.
         .jffLLLLGGLfjj;:  :,;ijLGLfjGEDDEGtfGGLfjj:.,jjLGGLti;,,;fj,
         ,fGGGGGGLj,.          ;jGGGGLLjffftjLj;..     .,tfGGGGGGGGGGi
          ,jGDDDj,.              :tLGLGGLGDLjt,           :iLGGDDDDGLif
          ,LDDDL,                 .;LDDDDGfff,              ,;iGDDj;,..
          ;fGGGf,                    ,;;;;,:                 tf;jL,
           ;.:::,               Powered by xCAT               ,j.:;
'
        echo -e "\$RESET"
        echo -e "\$YELLOW"
echo '
                            _________     ________________
                     ___  __\\_   ___ \\   /  _  \\__    ___/
                     \\  \\/  /    \\  \\/  /  /_\\  \\|    |   
                      >    <\\     \\____/    |    \\    |   
                     /__/\\_ \\\\______  /\\____|__  /____|   
                           \\/       \\/         \\/         
'
        echo -e "\$RESET"
}

EOS1


   print $inifile "busybox.anaconda mount -t proc /proc /proc\n";
   print $inifile "busybox.anaconda --install\n";
   print $inifile "mount -t sysfs /sys /sys\n";
   print $inifile "mount -o mode=0755 -t tmpfs /dev /dev\n";
   print $inifile "mkdir /dev/pts\n";
   print $inifile "mount -t devpts -o gid=5,mode=620 /dev/pts /dev/pts\n";
   print $inifile "mkdir /dev/shm\n";
   print $inifile "mkdir /dev/mapper\n";
   print $inifile "mknod /dev/null c 1 3\n";
   print $inifile "mknod /dev/zero c 1 5\n";
   print $inifile "mknod /dev/systty c 4 0\n";
   print $inifile "mknod /dev/tty c 5 0\n";
   print $inifile "mknod /dev/console c 5 1\n";
   print $inifile "mknod /dev/ptmx c 5 2\n";
   print $inifile "mknod /dev/rtc c 10 135\n";
   print $inifile "mknod /dev/tty0 c 4 0\n";
   print $inifile "mknod /dev/tty1 c 4 1\n";
   print $inifile "mknod /dev/tty2 c 4 2\n";
   print $inifile "mknod /dev/tty3 c 4 3\n";
   print $inifile "mknod /dev/tty4 c 4 4\n";
   print $inifile "mknod /dev/tty5 c 4 5\n";
   print $inifile "mknod /dev/tty6 c 4 6\n";
   print $inifile "mknod /dev/tty7 c 4 7\n";
   print $inifile "mknod /dev/tty8 c 4 8\n";
   print $inifile "mknod /dev/tty9 c 4 9\n";
   print $inifile "mknod /dev/tty10 c 4 10\n";
   print $inifile "mknod /dev/tty11 c 4 11\n";
   print $inifile "mknod /dev/tty12 c 4 12\n";
   print $inifile "mknod /dev/ttyS0 c 4 64\n";
   print $inifile "mknod /dev/ttyS1 c 4 65\n";
   print $inifile "mknod /dev/ttyS2 c 4 66\n";
   print $inifile "mknod /dev/ttyS3 c 4 67\n";

   foreach (@ndrivers) {
		print $inifile "insmod /lib/$_\n";
   }
      
      
# Start udev on s390x
if ($arch eq "s390x") {
	print $inifile <<EOMS;
# Start udev to find devices attached to node
echo `/sbin/udevd --daemon`
echo `/sbin/udevtrigger`
echo `/sbin/udevsettle`
sleep 1
echo `/sbin/depmod`

# Setup network scripts
echo "NETWORKING=yes" > /etc/sysconfig/network

echo "ONBOOT=yes" > /etc/sysconfig/network-scripts/ifcfg-$prinic
echo "BOOTPROTO=dhcp" >> /etc/sysconfig/network-scripts/ifcfg-$prinic
echo "DEVICE=$prinic" >> /etc/sysconfig/network-scripts/ifcfg-$prinic
echo 'OPTIONS="layer2=1"' >> /etc/sysconfig/network-scripts/ifcfg-$prinic
echo "SUBCHANNELS=$subchn" >> /etc/sysconfig/network-scripts/ifcfg-$prinic

# Turn on network devices
echo $subchn > /sys/bus/ccwgroup/drivers/qeth/group
echo 1 > /sys/bus/ccwgroup/drivers/qeth/$readChn/layer2
echo 1 > /sys/bus/ccwgroup/drivers/qeth/$readChn/online
echo "alias $prinic qeth" >> /etc/modprobe.conf
echo `ifup $prinic`
sleep 4
EOMS
}

   print $inifile <<EOMS;
# check and see if debug is specified on command line
grep '\(debug\)' /proc/cmdline > /dev/null && export DEBUG=1

# check the kernel parameter at first

# if one parameter for the booting device is there, we will use it
# TODO
# ( netdevice is recognized by SLES, )
# ( Dracut has one "network" module to handle the booting network devices, which use "ifname" )
# ( What should the other redhat versions use ?  netdev=<eth0> and BOOTIF=<mac address> )

# besides this action, the following code is also used to get the XCAT= value, which is for XCAT server
# TODO: does "anaconda.busybox sh" support "set " ?

PRINIC=$prinic

for i in `cat /proc/cmdline`; do
    KEY=`echo \$i |awk -F= '{print \$1}'`
    if [ "\$KEY" == 'netdev' ]; then
        NETDEV=`echo \$i |awk -F= '{print \$2}'`
    elif [ "\$KEY" == 'BOOTIF' ]; then
        VALUE=`echo \$i |awk -F= '{print \$2}'|sed -e s/^01-// -e s/-/:/g`
        BOOTIF=`ifconfig -a|grep -i "hwaddr \$VALUE"|awk '{print \$1}'`
    elif [ "\$KEY" == 'XCAT' ]; then
        VALUE=`echo \$i |awk -F= '{print \$2}'`
        # format: XCAT=xcatmaster:3001
        XCATSERVER=\$VALUE
    fi
done

if [ -z "\$IFACE" ]; then
    if [ ! -z "\$NETDEV" ]; then
        IFACE=\$NETDEV
    elif [ ! -z "\$BOOTIF" ]; then
        IFACE=\$BOOTIF
    elif [ ! -z "\$PRINIC" ]; then
        IFACE=\$PRINIC
    else
        echo "\${RED}Couldn't find the proper booting device, switch to shell...\${RESET}"
        shell
        exit
    fi
fi

export IFACE=\$IFACE
echo network --device \$IFACE --bootproto dhcp >> /bin/netstart

netstart \$IFACE
while ! ifconfig | grep inet; do
    echo -e "\${RED}Failed to acquire address, retrying \${RESET}"
    sleep 5
    netstart \$IFACE
done
ifconfig lo 127.0.0.1
ifconfig lo up
cd /
for i in `cat /proc/cmdline`; do
   KEY=`echo \$i |awk -F= '{print \$1}'`
   if [ "\$KEY" == 'imgurl' ]; then
      VALUE=`echo \$i |awk -F= '{print \$2}'`
      if [ "http" == "`echo \$VALUE|awk -F: '{print \$1}'`" ]; then
        #NOTE needs FT retry code to scale
        #NOTE: should prob have max count
        FILENAME=`echo \$VALUE|awk -F/ '{print \$NF}'`
        while [ ! -r "\$FILENAME" ]; do
          echo Getting \$VALUE...
          if ! wget \$VALUE; then
            ST=`expr \$RANDOM % 5`
            sleep \$ST
            rm -f \$FILENAME
          fi
        done
      fi
      if [ "nfs" == "`echo \$VALUE|awk -F: '{print \$1}'`" ]; then
        NFS=1
        SERVER=`echo \$VALUE|awk -F/ '{print \$3}'`
        ROOTDIR=`echo \$VALUE|awk -F/ '{for(i=4;i<=NF;i++) printf "/%s",\$i}'`
      fi
   # for NFS root 
   elif [ "\$KEY" == 'NFSROOT' ]; then
	NFSROOT=1
	VALUE=`echo \$i |awk -F= '{print \$2}'`
	SERVER=`echo \$VALUE|awk -F: '{print \$1}'`
	ROOTDIR=`echo \$VALUE|awk -F/ '{for(i=2;i<=NF;i++) printf "/%s",\$i}'`
   elif [ "\$KEY" == 'STATEMNT' ]; then
	STATELITE=1
	VALUE=`echo \$i |awk -F= '{print \$2}'`
    # the VALUE may be null
    if [ ! -z \$VALUE ]; then
	    SNAPSHOTSERVER=`echo \$VALUE|awk -F: '{print \$1}'`
	    SNAPSHOTROOT=`echo \$VALUE|awk -F/ '{for(i=2;i<=NF;i++) printf "/%s",\$i}'`
	    # may be that there is not server and just a directory.
	    if [ -z \$SNAPSHOTROOT ]
	    then
		    SNAPSHOTROOT=\$SNAPSHOTSERVER
		    SNAPSHOTSERVER=
	    fi
    fi
   fi
done

# show xCAT logo
fancydisplay


echo 0 > /proc/sys/vm/zone_reclaim_mode #Avoid kernel bug

# STATELITE code here:
if [ "\$STATELITE" = "1" ]; then
    echo Setting up Statelite
    # for loop back mouting capability!
    mknod /dev/loop0 b 7 0
    mkdir -p \$NEWROOT
    MAXTRIES=5
    ITER=0
    ME=`hostname`
    if [ "\$NFSROOT" = "1" ]; then
        while ! mount.nfs \${SERVER}:\${ROOTDIR}/rootimg \$NEWROOT -r -n -o nolock,rsize=32768,tcp,nfsvers=3,timeo=14; do
            ITER=\$(expr \$ITER + 1)
            if [ "\$ITER" == "\$MAXTRIES" ]; then
                echo "You are dead. rpower \$ME boot to play again."
                echo "Possible problems:
1. This initrd wasn't craeted for the statelite node?
2. Is DNS set up? Maybe that's why I can't mount \${SERVER}.
3. The nfs modules aren't set right in this initfs?"
                shell
                exit
            fi
            echo -e "\${RED}Could not mount \$SERVER:\$ROOTDIR on \$NEWROOT \$RESET"
            RS=`expr \$RANDOM % 30`
            echo -e "Trying again in \$RS seconds"
            sleep \$RS
        done
    elif [ "\$NFS" = "1" ]; then
        echo -e "\${RED}The \"imgurl=\" value should not be nfs-type if statelite mode is enabled \$RESET"
        shell
        exit
    else
        # for statelite mode on top of the ramdisk
EOMS
    print $inifile "if [ -r /rootimg-statelite.gz ]; then\n";
    print $inifile "echo Setting up RAM-root tmpfs.\n";
    if ($rootlimit) {
        print $inifile "    mount -o size=$rootlimit,mode=755 -t tmpfs rootfs \$NEWROOT \n";
    } else {
        print $inifile "    mount -o mode=755 -t tmpfs rootfs \$NEWROOT\n";
    }
    print $inifile <<EOMS;
            modprobe nfs
            cd \$NEWROOT
            echo -n "Extracting root file system:"
            if [ -x /bin/cpio ]; then
                gzip -cd /rootimg-statelite.gz |/bin/cpio -idum
            else
                gzip -cd /rootimg-statelite.gz |cpio -idum
            fi
            echo Done
        else
            echo -e "\${RED} Couldnot find rootimg-statelite.gz for statelite on top of ramdisk \$RESET"
            shell
            exit
        fi

    fi
    # now we need to mount the rest of the system. 
    if [ ! -e "\$NEWROOT/\$RWDIR" ]; then
        echo ""
        echo -e "\${RED}Hmmm... this NFS root directories doesn't have a /\$RWDIR directory for me to mount a rw filesystem. You'd better to create it... \${NORMAL}"
        echo ""
        shell
        exit
    fi

    while [ ! -e "\$NEWROOT/etc/init.d/statelite" ]; do
        echo ""
        echo -e "\${RED}Hmmm... \$NEWROOT/etc/init.d/statelite doesn't exist. Perhaps you didn't run liteimg for the current osimage"
        echo ""
        shell
        exit
    done

    mount -t tmpfs rw -o mode=$permission \$NEWROOT/\$RWDIR
    mkdir -p \$NEWROOT/\$RWDIR/tmpfs

    # mount the SNAPSHOT directory here for persistent use.
    if [ ! -z \$SNAPSHOTSERVER ]; then
        mkdir -p \$NEWROOT/\$RWDIR/persistent
        MAXTRIES=5
        ITER=0
        while ! mount \$SNAPSHOTSERVER:\$SNAPSHOTROOT \$NEWROOT/\$RWDIR/persistent -o nolock,rsize=32768; do
            ITER=\$(expr \$ITER + 1 )
            if [ "\$ITER" == "\$MAXTRIES" ]; then
                echo "You're dead. rpower \$ME boot to play again."
                echo "Possible problems:
1.  \$SNAPSHOTSERVER is not exporting \$SNAPSHOTROOT ?
2.  IS DNS set up? Maybe that's why I can't mount \$SNAPSHOTSERVER.";
                shell
                exit
            fi
            echo -e "\${RED}Hmmm... Can't mount \$SNAPSHOTSERVER:\$SNAPSHOTROOT. \${NORMAL}"
            RS=\$(expr \$RANDOM % 20 )
            echo -e "Trying again in \$RS seconds"
            sleep \$RS
        done
    fi

    # have to preserve the initial DHCP request.
    if [ ! -d \$NEWROOT/\$RWDIR/tmpfs/var/lib/dhclient ]; then
        mkdir -p \$NEWROOT/\$RWDIR/tmpfs/var/lib/dhclient
    fi

    if [ ! -d \$NEWROOT/\$RWDIR/tmpfs/var/lib/dhcp ]; then
        mkdir -p \$NEWROOT/\$RWDIR/tmpfs/var/lib/dhcp
    fi

    cp -fp /var/lib/dhclient/dhclient.leases \$NEWROOT/\$RWDIR/tmpfs/var/lib/dhclient/dhclient-\$IFACE.leases
    cp -fp /var/lib/dhclient/dhclient.leases \$NEWROOT/\$RWDIR/tmpfs/var/lib/dhcp/dhclient-\$IFACE.leases

    [ -e /etc/ntp.conf ] && mkdir -p \$NEWROOT/\$RWDIR/tmpfs/etc && cp /etc/ntp.conf \$NEWROOT/\$RWDIR/tmpfs/etc/
    [ -e /etc/ntp/step-kickers ] && mkdir -p \$NEWROOT/\$RWDIR/tmpfs/etc/ntp && cp /etc/ntp/step-kickers \$NEWROOT/\$RWDIR/tmpfs/etc/ntp
    [ -e /etc/resolv.conf ] && mkdir -p \$NEWROOT/\$RWDIR/tmpfs/etc && cp /etc/resolv.conf \$NEWROOT/\$RWDIR/tmpfs/etc/

    while [ ! -e \$NEWROOT/etc/init.d/statelite ]; do
        echo -e "\${RED} \$NEWROOT/etc/init.d/statelite doesn't exist in the osimge! \${NORMAL}"
        shell
    done

    # do all the mounts
    \$NEWROOT/etc/init.d/statelite

    # give the debug shell just before we go if specified!
    grep '\(shell\)' /proc/cmdline >/dev/null && shell

    echo 0x100 > /proc/sys/kernel/real-root-dev
    export keep_old_ip=yes
    mount -n --bind /dev/ \$NEWROOT/dev

    umount /sys
    umount /proc

    if ! exec /sbin/switch_root -c /dev/console \$NEWROOT /sbin/init; then
        echo ""
        echo -e "\${RED}Couldn't switch_root. Something must be wrong with the root image.\${RESET}"
        shell
    fi

fi
# END NFSROOT/Statelite code

if [ -r /rootimg.sfs ]; then
  echo Setting up squashfs with ram overlay.
  mknod /dev/loop0 b 7 0
  mkdir -p /ro
  mkdir -p /rw
  mount -t squashfs /rootimg.sfs /ro
  mount -t tmpfs rw /rw
  mount -t aufs -o dirs=/rw:/ro mergedroot \$NEWROOT
  mkdir -p \$NEWROOT/ro
  mkdir -p \$NEWROOT/rw
  mount --move /ro \$NEWROOT/ro
  mount --move /rw \$NEWROOT/rw
EOMS
   print $inifile "elif [ -r /rootimg.gz ]; then\n";
   print $inifile "echo Setting up RAM-root tmpfs.\n";
   if ($rootlimit) {
      print $inifile "  mount -o size=$rootlimit,mode=755 -t tmpfs rootfs \$NEWROOT\n";
   } else {
      print $inifile "  mount -o  mode=755 -t tmpfs rootfs \$NEWROOT\n";
   }
   print $inifile "  cd \$NEWROOT\n";
   print $inifile "  echo -n \"Extracting root filesystem:\"\n";
   print $inifile "  if [ -x /bin/cpio ]; then\n";
   print $inifile "  zcat /rootimg.gz |/bin/cpio -idum\n";
   print $inifile "  else\n";
   print $inifile "  zcat /rootimg.gz |cpio -idum\n";
   print $inifile "  fi\n";
   print $inifile "  echo Done\n";
   print $inifile "else\n";
   print $inifile "  echo -n Failed to download image, panicing in 5...\n";
   print $inifile "  for i in 4 3 2 1 0; do\n";
   print $inifile "    /bin/sleep 5\n";
   print $inifile "    echo -n \$i...\n";
   print $inifile "  done\n";
   print $inifile "  echo\n";
 print $inifile <<EOMS;
  echo "You're dead.  rpower nodename reset to play again.

* Did you packimage with -m cpio, -m squashfs, or -m nfs?
* If using -m squashfs did you include aufs.ko with geninitrd?
  e.g.:  -n tg3,squashfs,aufs,loop
* If using -m nfs did you export NFS and sync rootimg?  And
  did you include the aufs and nfs modules in the proper order:
  e.g.:  -n tg3,aufs,loop,sunrpc,lockd,nfs_acl,nfs

"
  sleep 5
EOMS
   print $inifile "  exit\n";
   print $inifile "fi\n";
   print $inifile "cd /\n";
   print $inifile "cp /var/lib/dhclient/dhclient.leases \$NEWROOT/dev/.dhclient-\$IFACE.leases\n";
   print $inifile "cp /var/lib/dhclient/dhclient.leases \$NEWROOT/var/lib/dhclient/dhclient-\$IFACE.leases\n";
   print $inifile 'if [ -z "$SNAPSHOTSERVER" ]; then cp /etc/resolv.conf $NEWROOT/etc/resolv.conf; fi'."\n";
   print $inifile "mknod \$NEWROOT/dev/console c 5 1\n";
   print $inifile "exec switch_root -c /dev/console \$NEWROOT /sbin/init\n";
   close($inifile);

   open($inifile,">"."/tmp/xcatinitrd.$$/bin/netstart");
   print $inifile "#!/sbin/nash\n";
   close($inifile);
   chmod(0755,"/tmp/xcatinitrd.$$/init");
   chmod(0755,"/tmp/xcatinitrd.$$/bin/netstart");
   @filestoadd=();
   foreach (@ndrivers) {
     if (-f "$customdir/$_") {
        push @filestoadd,[$_,"lib/$_"];
     } elsif (-f "$pathtofiles/$_") {
        push @filestoadd,[$_,"lib/$_"];
     }
   }
   # add rsync for statelite
   foreach ("bin/cpio","sbin/nash","sbin/busybox.anaconda","sbin/rmmod", "bin/bash", "usr/sbin/chroot", "sbin/mount.nfs", "usr/bin/rsync", "usr/bin/wc") {
      getlibs($_);
      push @filestoadd,$_;
   }
   
    # Additional binaries needed for udev on s390x
    if ($arch eq "s390x") {
        foreach ("sbin/udevsettle", "sbin/udevtrigger", "sbin/udevd", "sbin/depmod") {
            getlibs($_);
            push @filestoadd,$_;
        }
    }
   
   if ($arch =~ /x86_64/) {
      push @filestoadd,"lib64/libnss_dns.so.2";
      push @filestoadd,"lib64/libresolv.so.2";
   } else {
      push @filestoadd,"lib/libnss_dns.so.2";
   }
   push @filestoadd,keys %libhash;

   find(\&isnetdriver, <$rootimg_dir/lib/modules/$kernelver/*>);
   my $pathonrootimage = "$rootimg_dir/tmpfiles";
   my $pathinrootimage = "/tmpfiles";
   mkpath($pathonrootimage);
   foreach (@filestoadd) {
      if (ref($_)) {
         #print "$_->[0], $_->[1]\n";
         my $srcfile = $_->[0];
         system("chroot $rootimg_dir cp $srcfile $pathinrootimage");
         my $srcpath = "$pathonrootimage/".basename($_->[0]);
         if (-f "$customdir/".$_->[0]) {
            $srcpath="$customdir/".$_->[0];
         } elsif (-f "$pathtofiles/".$_->[0]) {
            $srcpath="$pathtofiles/".$_->[0];
         }
         mkpath(dirname("/tmp/xcatinitrd.$$/".$_->[1]));
         copy($srcpath,"/tmp/xcatinitrd.$$/".$_->[1]);
         chmod 0755,"/tmp/xcatinitrd.$$/".$_->[1];
      } else {
         #print "$_\n";
         system("chroot $rootimg_dir cp $_ $pathinrootimage");
         my $srcpath = "$pathonrootimage/".basename($_);
         if (-f "$customdir/$_") {
            $srcpath = "$customdir/$_";
         } elsif (-f "$pathtofiles/$_") {
            $srcpath = "$pathtofiles/$_";
         }
         mkpath(dirname("/tmp/xcatinitrd.$$/$_"));
         copy("$srcpath","/tmp/xcatinitrd.$$/$_");
         chmod 0755,"/tmp/xcatinitrd.$$/".$_;
      }
   }
   rmtree($pathonrootimage);

   # Copy udev and network scripts into initrd for s390x, which also works for other platforms
   # udev
   system("mkdir -p /tmp/xcatinitrd.$$/etc/udev");
   system("cp -r $rootimg_dir/etc/udev/* /tmp/xcatinitrd.$$/etc/udev");
   system("mkdir -p /tmp/xcatinitrd.$$/lib/udev");
   system("cp -r $rootimg_dir/lib/udev/* /tmp/xcatinitrd.$$/lib/udev");
   system("mkdir -p /tmp/xcatinitrd.$$/proc/self");
   system("cp -r /proc/self/oom_adj /tmp/xcatinitrd.$$/proc/self");
   
   # Network related scripts
   system("mkdir -p /tmp/xcatinitrd.$$/etc/sysconfig");
   system("cp -r $rootimg_dir/etc/sysconfig/* /tmp/xcatinitrd.$$/etc/sysconfig");
   system("mkdir -p /tmp/xcatinitrd.$$/sbin");
   system("cp -r $rootimg_dir/sbin/* /tmp/xcatinitrd.$$/sbin");
   system("mkdir -p /tmp/xcatinitrd.$$/lib/modules/$kernelver");
   system("cp -r $rootimg_dir/lib/modules/$kernelver/modules.dep /tmp/xcatinitrd.$$/lib/modules/$kernelver/modules.dep");
   system("mkdir -p /tmp/xcatinitrd.$$/etc/init.d");
   system("cp -r $rootimg_dir/etc/init.d/* /tmp/xcatinitrd.$$/etc/init.d");
   system("mkdir -p /tmp/xcatinitrd.$$/lib64");
   system("cp -r $rootimg_dir/lib64/* /tmp/xcatinitrd.$$/lib64");
   system("mkdir -p /tmp/xcatinitrd.$$/var/run/netreport");
	
   #copy("$rootimg_dir/lib/modules/*d","/tmp/xcatinitrd.$$/$_");
   system("cd /tmp/xcatinitrd.$$;find .|cpio -H newc -o|gzip -9 -c - > $destdir/initrd-$mode.gz");
   system("rm -rf /tmp/xcatinitrd.$$");

}

sub isyumdir {
   if ($File::Find::name =~ /\/repodata$/) {
      my $location = $File::Find::name;
      $location =~ s/\/repodata$//;
      push @yumdirs,$location;
   }
}

sub isnetdriver {
   foreach (@ndrivers) {
      if ($File::Find::name =~ /\/$_/) {
         my $filetoadd = $File::Find::name;
         $filetoadd =~ s!$rootimg_dir/!!;
         push @filestoadd,[$filetoadd,"lib/$_"];
      }
   }
}

sub postscripts {
   generic_post();

   # TODO: workaround for kdump on RHEL6
   # add one fake command: fsck.nfs
   unless ( -x "$rootimg_dir/sbin/fsck.nfs" ) {
        system("echo true > $rootimg_dir/sbin/fsck.nfs; chmod a+x $rootimg_dir/sbin/fsck.nfs");
   }
   

   if( ! -d "$rootimg_dir/opt/xcat/") {
       mkdir "$rootimg_dir/opt/xcat/";
   }
   copy ("$installroot/postscripts/xcatdsklspost", "$rootimg_dir/opt/xcat/");
   chmod '0755', "$rootimg_dir/opt/xcat/xcatdsklspost";
}


sub using_systemd {
    my $os = shift;
    if ($os =~ /fedora(\d+)/) {
        if ($1 >= 15) {
          return 1;
        }
    }

    return 0;
}


sub generic_post { #This function is meant to leave the image in a state approximating a normal install
   my $cfgfile;
   unlink("$rootimg_dir/dev/null");
   system("mknod $rootimg_dir/dev/null c 1 3");
   open($cfgfile,">","$rootimg_dir/etc/fstab");
   print $cfgfile "devpts  /dev/pts devpts   gid=5,mode=620 0 0\n";
   print $cfgfile "tmpfs   /dev/shm tmpfs    defaults       0 0\n";
   print $cfgfile "proc    /proc    proc     defaults       0 0\n";
   print $cfgfile "sysfs   /sys     sysfs    defaults       0 0\n";

   if (!&using_systemd($osver)) {
      if ($tmplimit) {
         print $cfgfile "tmpfs   /tmp     tmpfs    defaults,size=$tmplimit       0 2\n";
         print $cfgfile "tmpfs   /var/tmp     tmpfs    defaults,size=$tmplimit       0 2\n";
      } else {
         print $cfgfile "tmpfs   /tmp     tmpfs    defaults,size=10m             0 2\n";
         print $cfgfile "tmpfs   /var/tmp     tmpfs    defaults,size=10m       0 2\n";
      }
   }

   my $rootfs_name=$profile."_".$arch;
   print $cfgfile "$rootfs_name    /   tmpfs   rw  0 1\n";

   close($cfgfile);
   open($cfgfile,">","$rootimg_dir/etc/sysconfig/network");
   print $cfgfile "NETWORKING=yes\n";
   close($cfgfile);
   open($cfgfile,">","$rootimg_dir/etc/resolv.conf");
   print $cfgfile "#Dummy resolv.conf to make boot cleaner";
   close($cfgfile);

   # Create the ifcfg-x file for diskless node. But keep the ONBOOT=no
   # to skip the break of nfs-based boot
   if ($prinic) {
     open($cfgfile,">","$rootimg_dir/etc/sysconfig/network-scripts/ifcfg-$prinic");
     print $cfgfile "ONBOOT=no\nBOOTPROTO=dhcp\nDEVICE=$prinic\n";
     close($cfgfile);
   }
   foreach (split /,/,$othernics) {
      if (/^$/) { next; }
      open($cfgfile,">","$rootimg_dir/etc/sysconfig/network-scripts/ifcfg-$_");
      print $cfgfile "ONBOOT=yes\nBOOTPROTO=dhcp\nDEVICE=$_\n";
      close($cfgfile);
   }
   
   # securetty not needed on s390x
   if ($arch ne "s390x") {
      open($cfgfile,">>","$rootimg_dir/etc/securetty");
      print $cfgfile "ttyS0\n";
      print $cfgfile "ttyS1\n";
      close($cfgfile);
   }
	
   my @passwd;
   open($cfgfile,"<","$rootimg_dir/etc/passwd");
   @passwd = <$cfgfile>;
   close($cfgfile);
   open($cfgfile,">","$rootimg_dir/etc/passwd");
   foreach (@passwd) {
      if (/^root:/) {
         s/^root:\*/root:x/
      }
      print $cfgfile $_;
   }
   close($cfgfile);
   foreach (<$rootimg_dir/etc/skel/.*>) {
      if (basename($_) eq '.' or basename($_) eq '..') {
         next;
      }
      copy $_,"$rootimg_dir/root/";
   }
   unless (  -r <$rootimg_dir/etc/rc3.d/S??network>) {
       symlink  "/etc/init.d/network","$rootimg_dir/etc/rc3.d/S10network";
   }
   
   # gettyset is not found on s390x
   if ($arch ne "s390x") {
      if (!&using_systemd($osver)) {
         open($cfgfile,">","$rootimg_dir/etc/init.d/gettyset");
         print $cfgfile "#!/bin/bash\n"; 
         print $cfgfile "for i in `cat /proc/cmdline`; do\n"; 
         print $cfgfile '  KEY=`echo $i|cut -d= -f 1`'."\n";
         print $cfgfile "  if [ \"\$KEY\" == \"console\" -a \"\$i\" != \"console=tty0\" ]; then\n";
         print $cfgfile "    VALUE=`echo \$i | cut -d= -f 2`\n"; 
         print $cfgfile "     COTTY=`echo \$VALUE|cut -d, -f 1`\n";
         print $cfgfile "     COSPEED=`echo \$VALUE|cut -d, -f 2|cut -dn -f 1`\n";
         print $cfgfile "     if echo \$VALUE | grep n8r; then\n";
         print $cfgfile "        FLOWFLAG=\"-h\"\n";
         print $cfgfile "     fi\n";
         print $cfgfile "     if [ -x /sbin/initctl ]; then\n";	# Upstart style
                                 # The syntax of next line is not correct, that means it does NOthing. (rh6 and higher)
                                 # And it should NOT work for rh6 and higher, otherwise it will cauase multiple agetty for ttySx
         print $cfgfile "        initctl emit --no-wait fedora.serial-console-available \$COTTY \$COSPEED\n";
         print $cfgfile "     else\n";
         print $cfgfile "       echo xco:2345:respawn:/sbin/agetty \$FLOWFLAG \$COTTY \$COSPEED xterm >> /etc/inittab\n";
         print $cfgfile "        init q\n";
         print $cfgfile "     fi\n";
         print $cfgfile "  fi\n";
         print $cfgfile "done\n";

         close($cfgfile);

         chmod(0755,"$rootimg_dir/etc/init.d/gettyset");
         system("cd $rootimg_dir/etc/rc3.d; ln -sf ../init.d/gettyset S60gettyset");
      }
		
      copy("$installroot/postscripts/xcatpostinit", "$rootimg_dir/etc/init.d/xcatpostinit");
      chmod(0755, "$rootimg_dir/etc/init.d/xcatpostinit");
      system("cd $rootimg_dir/etc/rc3.d; ln -sf ../init.d/xcatpostinit S61xcatpostinit");
   }
} 


my $driver_name;
my $real_path;
sub get_path ()
{
    if ($File::Find::name =~ /\/$driver_name/) {
        $real_path = $File::Find::name;
    }
}

my @all_real_path;
sub get_all_path ()
{
    if ($File::Find::name =~ /\/$driver_name/) {
        push @all_real_path, $File::Find::name;
    }
}

# Load driver disk and driver rpm to the initrd
# Get the driver disk or driver rpm from the osimage.driverupdatesrc
# The valid value: dud:/install/dud/dd.img,rpm:/install/rpm/d.rpm, if missing the tag: 'dud'/'rpm'
# the 'rpm' is default.
#
# If cannot find the driver disk from osimage.driverupdatesrc, will try to search driver disk 
# from /install/driverdisk/<os>/<arch>
#
# For driver rpm, the driver list will be gotten from osimage.netdrivers. If not set, copy all the drivers from driver 
# rpm to the initrd.
#
# Return the driver names by loading order

sub load_dd ()
{
    my @dd_list;
    my @rpm_list;
    my @driver_list;

    my $Injectalldriver;
    my @rpm_drivers;

    # Parse the parameters to the the source of Driver update disk and Driver rpm, and driver list as well
    if ($driverupdatesrc) {
        my @srcs = split(',', $driverupdatesrc);
        foreach my $src (@srcs) {
            if ($src =~ /dud:(.*)/i) {
                push @dd_list, $1;
            } elsif ($src =~ /rpm:(.*)/i) {
                push @rpm_list, $1;
            } else {
                push @rpm_list, $src;
            }
        }
    }
    if (! @dd_list) {
        # get Driver update disk from the default path if not specified in osimage
        # check the Driver Update Disk images, it can be .img or .iso
        if (-d "$installroot/driverdisk/$osver/$arch") {
            @dd_list = `find $installroot/driverdisk/$osver/$arch -type f`;
        }
    }

    foreach (split /,/,$netdriver) {
        if (/^allupdate$/) {
            $Injectalldriver = 1;
            next;
        }
        unless (/\.ko$/) {
            s/$/.ko/;
        }
        push @driver_list, $_;
    }


    chomp(@dd_list);
    chomp(@rpm_list);

    unless (@dd_list || (@rpm_list && ($Injectalldriver || @driver_list))) {
        return ();
    }

    # Create the work space for initrd hack
    my $dd_dir = mkdtemp("/tmp/ddtmpXXXXXXX");
    mkpath "$dd_dir/mnt";
    mkpath "$dd_dir/mods";
    
    my @dd_drivers = ();    #driver name
    
    # Loading drivers from each Driver Disk
    foreach my $dd (@dd_list) {
        my $rc = system ("mount -o loop $dd $dd_dir/mnt");
        if ($rc) {
            print "mount the Driver Disk $dd failed.\n";
            next;
        }
    
        if (! (-f "$dd_dir/mnt/rhdd" || -f "$dd_dir/mnt/modinfo"
                || -f "$dd_dir/mnt/modules.dep" || -f "$dd_dir/mnt/modules.cgz")) {
            print "The Driver Disk $dd has not correct format.\n";
            system ("umount -f $dd_dir/mnt");
            next;
        }
    
        # Load the modinfo
        open($modinfo, "<", "$dd_dir/mnt/modinfo");
        my @modinfo_lines = <$modinfo>;
        my $mod_ver = shift @modinfo_lines;
        chomp($mod_ver);
        if ($mod_ver !~ /^Version 0/) {
            print "The Driver Disk $dd has unknown version.\n";
            system ("umount -f $dd_dir/mnt");
            next;
        }
    
        foreach my $line (@modinfo_lines) {
            if ($line !~ /^Version/ && $line =~ /^(\w+)/) {
                chomp($line);
                if ($line =~ /^\s*$/) { next; }
                $line =~ s/$/\.ko/;
                push @dd_drivers, $line;
            }
        }
        close($modinfo);
   
        # Copy the firmware 
        if (-d "$dd_dir/mnt/firmware") {
            system ("cp -rf $dd_dir/mnt/firmware $rootimg_dir/lib/firmware");
        } 

        # Load the modules.cgz
        system ("cd $dd_dir/mods; gunzip -c $dd_dir/mnt/modules.cgz |cpio -id");
        if (! -d "$rootimg_dir/lib/modules/$kernelver/kernel/drivers/driverdisk") {
            mkpath "$rootimg_dir/lib/modules/$kernelver/kernel/drivers/driverdisk";
        }

        # Copy the drivers to the root image
        my @drivers = `find $dd_dir/mods/$kernelver/$arch/ -type f`;

        foreach my $d (@drivers) {
            chomp($d);
            $driver_name = $d;
            $driver_name =~ s/.*\///;
            $real_path = "";
            find (\&get_path, <$rootimg_dir/lib/modules/$kernelver/*>);
            if ($real_path eq "") {
                system ("cp $d $rootimg_dir/lib/modules/$kernelver/kernel/drivers/driverdisk");
            } else {
                system ("cp $d $real_path");
            }
        }

        rmtree "$dd_dir/mods/*";
    
        my $rc = system ("umount -f $dd_dir/mnt");
        if ($rc) {
            print "umount the directory $dd_dir/mnt failed\n";
            exit 1;
        }
    }

    # Loading the drivers from rpm packages
    if (@rpm_list && ($Injectalldriver || @driver_list)) {
        # Extract the files from rpm to the tmp dir
        mkpath "$dd_dir/rpm";
        foreach my $rpm (@rpm_list) {
            if (-r $rpm) {
                if (system ("cd $dd_dir/rpm; rpm2cpio $rpm | cpio -idum")) {
                    print "Error: Cannot extract the files from the rpm $rpm.\n";
                }
            } else {
                print "Error: Cannot read the rpm $rpm.\n";
            }
        }

        # To skip the conflict of files that some rpm uses the xxx.ko.new as the name of the driver
        # Change it back to xxx.ko here
        $driver_name = "\*ko.new";
        @all_real_path = ();
        find(\&get_all_path, <$dd_dir/rpm/*>);
        foreach my $file (@all_real_path) {
            my $newname = $file;
            $newname =~ s/\.new$//;
            if (system ("mv -f $file $newname")) {
                print "Error: Could not rename $file\n";

            }
        }

        # Copy the firmware to the rootimage
        if (-d "$dd_dir/rpm/lib/firmware") {
            system ("cp -rf $dd_dir/rpm/lib/firmware $rootimg_dir/lib");
        }
        # Copy the drivers to the rootimage
        if (-d "$dd_dir/rpm/lib/modules/$kernelver") {
          if (@driver_list) {
            foreach my $driver (@driver_list) {
              $driver_name = $driver;
              $real_path = "";
              find(\&get_path, <$dd_dir/rpm/lib/modules/$kernelver/*>);
              if ($real_path && $real_path =~ m!$dd_dir/rpm(/lib/modules/$kernelver/.*?)[^\/]*$!) {
                  # remove the old one if existing
                  @all_real_path = ();
                  find(\&get_all_path, <$rootimg_dir/lib/modules/$kernelver/*>);
                  foreach (@all_real_path) {
                      if (-r $_) {
                          unlink ($_);
                      }
                  }
                  
                  if (! -d "$rootimg_dir$1") {
                      mkpath "$rootimg_dir$1";
                  }
                  system ("cp -rf $real_path $rootimg_dir$1");
                  push @rpm_drivers, $driver;
              } else {
                  print "Error: cannot find the driver $driver from the driver rpms\n";
              }
            }
          } elsif ($Injectalldriver) {
            # copy all the drviers to the rootimage
            find(\&get_all_path, <$dd_dir/rpm/lib/modules/$kernelver/*>);
            my @all_drivers = @all_real_path;
            foreach my $new_driver (@all_drivers) {
              if (basename($new_driver) =~ /\.ko$/) {
                  # remove the old one if existing
                  $driver_name = basename($new_driver);
                  @all_real_path = ();
                  find(\&get_all_path, <$rootimg_dir/lib/modules/$kernelver/*>);
                  foreach my $old_driver (@all_real_path) {
                      if (-r $old_driver) {
                          unlink ($old_driver);
                      }
                  }
                  push @rpm_drivers, basename($new_driver);
              }
            }
            
            system ("cp -rf $dd_dir/rpm/lib/modules/$kernelver $rootimg_dir/lib/modules/");
          }
        } else {
          print "Warning: cannot find the kernel $kernelver from drvier rpms\n";
        }

        push @dd_drivers, @rpm_drivers;
    }

    # Generate the dependency relationship
    system ("chroot '$rootimg_dir' depmod $kernelver");

    # Clean the env
    rmtree "$dd_dir";

    return @dd_drivers;
}

sub usage {
    print 'Usage: genimage [ -i <nodebootif> ] [ -n <nodenetdrivers> ] [-r <otherifaces>] -o <osver> -p <profile> -k <kernelver> [--permission <permission>] [--interactive]'."\n";
   print "       --permission only works with statelite mode\n";
   print "Examples:\n";
   print " genimage -i eth0 -n tg3 -o centos5.1 -p compute \n";
   print " genimage -i eth0 -r eth1,eth2 -n tg3,bnx2 -o centos5.1 -p compute --interactive\n";
   print " genimage -i eth0 -n igb,e1000e,e1000,bnx2,tg3 -o centos5.4 -p nfsroot\n";
   print " genimage -i eth0 -n igb,e1000e,e1000,bnx2,tg3 -o centos5.4 -p nfsroot --permission 777\n";

    return 0;
}