xcat-core/xCAT-server/share/xcat/netboot/sles/genimage

#!/usr/bin/env perl
BEGIN
{
    $::XCATROOT = $ENV{'XCATROOT'} ? $ENV{'XCATROOT'} : '/opt/xcat';
}
use lib "$::XCATROOT/lib/perl";

use lib "../imgutils";

use File::Basename;
use File::Path;
use File::Copy;
use File::Find;
use Getopt::Long;
use Cwd qw(realpath);
use File::Temp qw/mkdtemp/;

use imgutils;

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

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 $onlyinitrd=0;
if ($name =~ /geninitrd/) {
   $onlyinitrd=1;
}
my $rootlimit;
my $tmplimit;
my $installroot = "/install";
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 $mode;
my $permission; #the permission works only for statelite mode currently

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

#-- fetch current version form CVS (overwrite locally changed versions)
# if (opendir(CVS,"$pathtofiles/CVS")){
#   close CVS;
#   my $cvsout = qx/cd $pathtofiles; cvs update -C 2>&1/;
#   chomp $cvsout;
#   if ( $cvsout ne "cvs update: Updating ." ) {
#     print "Difference of local copy from CVS detected\n";
#     print $cvsout,"\n";
#     print "Trying to re-run $name\n";
#     print("$pathtofiles/$name ",join(" ",@ARGV),"\n");
#     exec("$pathtofiles/$name",@ARGV);
#   }
# }


$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,
   'm=s' => \$mode,      #provide options for the mode of "genimage"
   'permission=s' => \$permission
);

if (@ARGV > 0) {
    $imagename=$ARGV[0];
    if ($arch or $osver or $profile) {
	print "-o, -p and -a options are not allowed when a image name is specified.\n";
        exit 1;
    }
    #load the module in memory
    eval {require("$::XCATROOT/lib/perl/xCAT/Table.pm")};
    if ($@) {
	print $@;
	exit 1;
    }
   
    #get the info from the osimage and linux 
    my $osimagetab=xCAT::Table->new('osimage', -create=>1);
    if (!$osimagetab) {
	print "The osimage table cannot be opened.\n";
	exit 1;
    }
    my $linuximagetab=xCAT::Table->new('linuximage', -create=>1);
    if (!$linuximagetab) {
	print "The linuximage table cannot be opened.\n";
	exit 1;
    }
    (my $ref) = $osimagetab->getAttribs({imagename => $imagename}, 'osvers', 'osarch', 'profile', 'provmethod');
    if (!$ref) {
	print "Cannot find image \'$imagename\' from the osimage table.\n";
	exit 1;
    }
    (my $ref1) = $linuximagetab->getAttribs({imagename => $imagename}, 'pkglist', 'pkgdir', 'otherpkglist', 'otherpkgdir', 'postinstall', 'rootimgdir');
    if (!$ref1) {
	print "Cannot find $imagename from the linuximage table\n";
	exit 1;
    }

    $osver=$ref->{'osvers'};
    $arch=$ref->{'osarch'};
    $profile=$ref->{'profile'};
    my $provmethod=$ref->{'provmethod'};
    
    unless ($osver and $arch and $profile and $provmethod) {
	print"osimage.osvers, osimage.osarch, osimage.profile and osimage.provmethod must be specified for the image $imagename in the database.\n";
	exit 1;
    }

    if ($provmethod ne 'netboot') {
	print "\'$imagename\' cannot be used to build diskless image. Make sure osimage.provmethod is 'netboot'.";
	exit 1;
    }

    if (! $ref1->{'pkglist'}) {
	print"A .pkglist file must be specified for image \'$imagename\' in the linuximage table.\n";
        exit 0;
    }
    $pkglist =$ref1->{'pkglist'};

    $srcdir=$ref1->{'pkgdir'};
    if ($srcdir) { $srcdir="$srcdir/1"; }
    $srcdir_otherpkgs=$ref1->{'otherpkgdir'};
    $otherpkglist=$ref1->{'otherpkglist'};
    $postinstall_filename=$ref1->{'postinstall'};
    $destdir=$ref1->{'rootimgdir'};
}

if ($mode eq "statelite") {
    if (!$permission) {
        $permission = "755";
    }
}


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

if (!$srcdir) { 
    $srcdir="$installroot/$osver/$arch/1";
}

if (!$srcdir_otherpkgs) { 
    $srcdir_otherpkgs = "$installroot/post/otherpkgs/$osver/$arch"; 
}

if (!$destdir)
{
    $destdir="$installroot/netboot/$osver/$arch/$profile";
}
$rootimg_dir="$destdir/rootimg";


unless ($osver and $profile and $netdriver and $prinic) {
   print 'Usage: genimage -i <nodebootif> -n <nodenetdrivers> [-r <otherifaces>] -k <KERNELVER> -o <OSVER> -p <PROFILE> -a <ARCH> [-m <mode> [--permission <permission>]]'."\n";
   print '       genimage -i <nodebootif> -n <nodenetdrivers> [-r <otherifaces>] -k <KERNELVER> <imagename>'."\n";
   print '       --permission only works when "-m statelite" is set'."\n";
   print "Examples:\n";
   print " genimage -i eth0 -n tg3 -o centos5.1 -p compute\n";
   print " genimage -i eth0 -r eth1,eth2 -n tg3,bnx2 -o centos5.1 -p compute\n";
   print " genimage -i eth0 -n tg3,bnx2 -o centos5.1 -p compute -m statelite\n";
   print " genimage -i eth0 -n tg3,bnx2 -o centos5.1 -p compute -m statelite --permission 777\n";
   print " genimage -i eth0 -ntg3 myimagename\n";
   exit 1;
}
my @ndrivers;
foreach (split /,/,$netdriver) {
   unless (/\.ko$/) {
      s/$/.ko/;
   }
   if (/^$/) {
      next;
   }
	
	# Do not include qeth module here
	# This module is included later on
	if (!($_ =~ m/qeth/i)) {
   		push @ndrivers, $_;
	}
}
unless (grep /af_packet/,@ndrivers) {
   unshift(@ndrivers,"af_packet.ko");
}

if($mode eq "statelite") {
    push @ndrivers, "sunrpc.ko";
    push @ndrivers, "lockd.ko";
    push @ndrivers, "nfs_acl.ko";
    push @ndrivers, "fscache.ko";
    push @ndrivers, "auth_rpcgss.ko";
    push @ndrivers, "exportfs.ko";
    push @ndrivers, "nfsd.ko";
    push @ndrivers, "nfs.ko";

	# Additional modules needed on s390x
	if ($arch eq "s390x") {
		push @ndrivers, "qdio.ko";
		push @ndrivers, "ccwgroup.ko";

		# af_packet is already included above 
		# push @ndrivers, "af_packet.ko";

		push @ndrivers, "qeth.ko";
		push @ndrivers, "qeth_l2.ko";
		push @ndrivers, "qeth_l3.ko";
	}
}

my $osver_host;
if(`grep VERSION /etc/SuSE-release` =~ /VERSION = (\d+)/) {
    $osver_host=$1;
} else {
    $osver_host=11;
}

unless ($onlyinitrd) {
    if (!$imagename) {
	$otherpkglist=imgutils::get_profile_def_filename($osver, $profile, $arch, $customdir, "otherpkgs.pkglist");
	if (!$otherpkglist) { $otherpkglist=imgutils::get_profile_def_filename($osver, $profile, $arch, $pathtofiles, "otherpkgs.pkglist"); }
    }
    my %extra_hash=();
    if ($otherpkglist) {
       %extra_hash=imgutils::get_package_names($otherpkglist);
    }


   mkpath "$rootimg_dir/etc";
   mkpath "$rootimg_dir/dev";
   #system "mount -o bind /dev $rootimg_dir/dev";
    if( ! -e "$rootimg_dir/dev/zero") {
        system "mknod $rootimg_dir/dev/zero c 1 5";
    }
    if( ! -e "$rootimg_dir/dev/null") {
        system "mknod $rootimg_dir/dev/null c 1 3"; #that's neccessary for SLES11
    }
   open($fd,">>","$rootimg_dir/etc/fstab");
   print $fd "#Dummy fstab for rpm postscripts to see\n";
   close($fd);
   if($osver_host == 11) {#zypper in SLES11 is different
	   if(-e "$rootimg_dir/etc/zypp/repos.d/$osver.repo") {
		   system("rm -rf $rootimg_dir/etc/zypp/repos.d/$osver.repo");
	   }
	   system("zypper -R $rootimg_dir ar file:$srcdir $osver");
   }else {
	   system("zypper -R $rootimg_dir sa file:$srcdir");
   }

   #remove the old repository for extra packages
   my $result=`zypper -R $rootimg_dir sl |grep otherpkg|cut -f2 -d '|'|tr "\n" " "`;
   if ($result =~ /\S/) {
       system("zypper -R $rootimg_dir sd $result");
   }

   #add the new repository for extra packages
   my %extrapkgnames; 
   if($osver_host == 11) {	#SLES11
      if(-e "$rootimg_dir/etc/zypp/repos.d/otherpkg.repo") {
	  system("rm -rf $rootimg_dir/etc/zypp/repos.d/otherpkg.repo");
      }
   }
   my $index=1;
   my $pass;
   foreach $pass (sort (keys(%extra_hash))) {
     foreach (keys(%{$extra_hash{$pass}})) {
       if (($_ eq "PRE_REMOVE") || ($_ eq "POST_REMOVE")) { next;} 
       my $whole_path="$srcdir_otherpkgs/$_";
       if (-r "$srcdir_otherpkgs/$_/repodata/repomd.xml") {
	   if($osver_host == 11) { 
	       system("zypper -R $rootimg_dir ar file:$srcdir_otherpkgs/$_  otherpkg$index");
	   }else {
	       system("zypper -R $rootimg_dir sa file:$srcdir_otherpkgs/$_");
	   }
       } else {
	   if($osver_host == 11) { 
	       system("zypper -R $rootimg_dir ar -t Plaindir file:$srcdir_otherpkgs/$_  otherpkg$index");
	   }else {
	       system("zypper -R $rootimg_dir sa -t Plaindir file:$srcdir_otherpkgs/$_");
	   }
       }
       $index++;

       my $pa=$extra_hash{$pass}{$_};
       $extrapkgnames{$pass} .= " " . join(' ', @$pa);
     }
   }

   #-- add custom repositories to the image  
   #TODO: should we add the support to otherpkgs for this? we have too many list files and it seems only SLES supports this
   my $repolist;
    $repolist = imgutils::get_profile_def_filename($osver, $profile, $arch, $customdir, "repolist");
    if(!$repolist) {
        $repolist = imgutils::get_profile_def_filename($osver, $profile, $arch, $pathtofiles, "repolist");
    }

   if ( -r "$repolist") {
     print "Reading custom repositories\n";
     open($repoconfig,"<","$repolist");
     while (<$repoconfig>) {
       chomp;
       next if /^\s*#/;
       my ($repotype,$repourl,$repoalias) = split m/\|/;
       system("zypper -R $rootimg_dir ar $repourl $repoalias");
     }
   }

   # Refresh the zypper cache in case there is still old data out there
   system("zypper -R $rootimg_dir refresh");

   #my $yumcmd = "yum -y -c /tmp/genimage.$$.yum.conf --installroot=$rootimg_dir --disablerepo=* ";
   #$yumcmd .= "install ";
   #mkpath("$rootimg_dir/var/lib/yum");
   my $yumcmd;
   if($osver =~ /sles11/ && $osver_host == 11) {
       $yumcmd = "zypper -R $rootimg_dir install -l "; #add -l for SLES11
   }else {
        $yumcmd = "zypper -R $rootimg_dir install ";
   }

   #install packages from pkglist file
   my $pkgnames;
   if (!$imagename) {
       $pkglist=imgutils::get_profile_def_filename($osver, $profile, $arch, $customdir, "pkglist");
       if (!$pkglist) { $pkglist=imgutils::get_profile_def_filename($osver, $profile, $arch, $pathtofiles, "pkglist"); }
   }

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

   my %pkg_hash=imgutils::get_package_names($pkglist);
   my $index=1;
   foreach $pass (sort (keys(%pkg_hash))) {
       $pkgnames = "";
       foreach (keys(%{$pkg_hash{$pass}})) {
           if (($_ eq "PRE_REMOVE") || ($_ eq "POST_REMOVE")) { next;} 
           my $pa=$pkg_hash{$pass}{$_};
           $pkgnames .= " " . join(' ', @$pa);
       }
       print "$yumcmd $pkgnames\n";
       my $rc = system("$yumcmd $pkgnames");
       $rc = $rc >> 8;
       if (($rc) && ($rc != '104')) { 
          print "zypper invocation failed with rc: $rc\n";
          exit 1;
       }
   }

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

       #add extra packages in the list
       if ($extrapkgnames{$pass}) {
           print "$yumcmd $extrapkgnames{$pass}\n";
           $rc = system("$yumcmd $extrapkgnames{$pass}");
           $rc = $rc >> 8;
           if (($rc) && ($rc != '104')) { 
	       print "zypper invocation failed with rc: $rc\n";
	       exit 1;
           }
       }

       #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) {
	       $rc = system("$yumcmd_remove $rm_packges");
           }
       }
   }

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

   postscripts(); #run 'postscripts'
}
unlink "/tmp/genimage.$$.yum.conf";

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

if (($postinstall_filename) && (-x $postinstall_filename)) {
    #print "postinstall_filename=$postinstall_filename\n";
    my $rc = system($postinstall_filename, $rootimg_dir,$osver,$arch,$profile);
    if($rc) {
        print "postinstall script failed\n";
        exit 1;
    }
}


if($mode eq "statelite") {
    mkpath "$rootimg_dir/.statelite"; # create place for NFS mounts;
    mkpath "$rootimg_dir/root/.ssh"; # create place for NFS mounts for ssh;
    # this script will get the directories;
    unless( -r "$pathtofiles/../add-on/statelite/rc.statelite") {
        print "Can't find $pathtofiles/../add-on/statelite/rc.statelite!\n";
        exit;
    }
    system("cp $pathtofiles/../add-on/statelite/rc.statelite $rootimg_dir/etc/init.d/statelite");
    # the dhcp client information stores in the directory "/var/lib/dhcpcd/"
    unless(-l "$rootimg_dir/var/lib/dhcpcd") {
        mkpath "$rootimg_dir/var/lib/dhcpcd/";
        system("touch $rootimg_dir/var/lib/dhcpcd/dhcpcd-$prinic.info");
    }
    # which is different from the Redhat family
}

#some rpms mounts the imageroot/proc on the /proc, need to release it, 
#otherwise got kernal panic when installing 
#sometimes, the proc fs is not mounted, so one warning/error message will display,
#and I add one check point here.
my $MFD;
open MFD, "/proc/mounts";
my @lines = <MFD>;
close MFD;

my $ret = grep m{$rootimg_dir/proc}, @lines;
if($ret > 0) {
    system("umount -l $rootimg_dir/proc");
}

#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
my @KVERS= <$rootimg_dir/boot/vmlinu[xz]-*>;

# The kernel name is different on s390x, e.g. image-2.6.32.9-0.5-default
if ($arch eq "s390x") {
	@KVERS = <$rootimg_dir/boot/image-*>;	
}
	
#as I know, s390x is using image-* as its kernel name
unless (scalar(@KVERS)) {
    @KVERS=<$rootimg_dir/boot/image-*>;
}
foreach (@KVERS) {
	s/vmlinu.-//;
    s/image-//;
}
unless (scalar(@KVERS)) {
	@KVERS= <$rootimg_dir/lib/modules/*>;
}
if (scalar(@KVERS)) {
    foreach my $kver (@KVERS) {
        if ($kver !~ m/.gz$/) {
            $basekernelver = basename($kver);
            last;
        }
    }
}
unless ($basekernelver) {
    $basekernelver = `uname -r`;
}

# Extract the base kernel
if ($arch eq "s390x") {
	$basekernelver =~ s/image-//g;
}

chomp($basekernelver);

if ($kernelver) {
    # if the kernelver is specified by "-k", 
    # the kernel file should be in /boot
    # the moudles should be in /lib/modules/$kernelver
    if ( -e "/boot/vmlinux-$kernelver") {
        copy("/boot/vmlinux-$kernelver", "$rootimg_dir/boot/");
    }elsif ( -e "/boot/vmlinuz-$kernelver") {
        copy("/boot/vmlinuz-$kernelver", "$rootimg_dir/boot/");
    }elsif ( -e "/boot/image-$kernelver") {
        copy("/boot/image-$kernelver", "$rootimg_dir/boot/");
    }else {
        xdie("couldn't find the kernel file matched $kernelver in /boot");
    }
    if ( -e "/lib/modules/$kernelver" ) {
        copy("/lib/modules/$kernelver", "$rootimg_dir/lib/modules/");
    } else {
        xdie("couldn't find /lib/modules/$kernelver");
    }
} else {
    $kernelver=$basekernelver;
}


# 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.\n";
}
@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);

mkinitrd();


sub getlibs {
	my $file = shift;
	my $liblist = `chroot $rootimg_dir ldd $file`;
	my @libs = split/\n/,$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 {
    mkpath("/tmp/xcatinitrd.$$/bin");
    
    if(-r "$rootimg_dir/boot/vmlinux-$kernelver") { # SLES use vmlinux-* as its name
        copy("$rootimg_dir/boot/vmlinux-$kernelver","$destdir/kernel");
    } elsif(-r "$rootimg_dir/boot/vmlinuz-$kernelver") { # OpenSuSE maight use vmlinuz-* as its name
        copy("$rootimg_dir/boot/vmlinuz-$kernelver","$destdir/kernel");
    } elsif(-r "$rootimg_dir/boot/image-$kernelver") { # SLES on s390x use image-* as its name
        copy("$rootimg_dir/boot/image-$kernelver","$destdir/kernel");
    } else {
		xdie("Cannot find suitable kernel file for $kernelver");
    }

    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.$$/tmp");
    mkpath("/tmp/xcatinitrd.$$/var/run");
    mkpath("/tmp/xcatinitrd.$$/lib64/firmware");
    #	if($osver =~ /sles/ && $arch eq "ppc64") {#SLES for Power6&7
    #	    mkpath("/tmp/xcatinitrd.$$/lib64/power6");
    #	    mkpath("/tmp/xcatinitrd.$$/lib64/power7");
    #	}
    mkpath("/tmp/xcatinitrd.$$/lib/power6");#SLES10
    mkpath("/tmp/xcatinitrd.$$/lib/power7");#SLES10
    mkpath("/tmp/xcatinitrd.$$/lib/mkinitrd/bin");
    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/dhcpcd");
    my $inifile;
    open($inifile,">","/tmp/xcatinitrd.$$/init");
    print $inifile "#!/bin/bash\n";

# copied from genimage for rh
# 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 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 "mount -t proc /proc /proc\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/random c 1 8\n";
   print $inifile "mknod /dev/urandom c 1 9\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";
   }
if($mode eq "statelite") {
    print $inifile "echo debug: before netstart\n";
    print $inifile "# check and see if debug is specified on command line\n";
    print $inifile "grep '\(debug\)' /proc/cmdline > /dev/null && export DEBUG=1\n";
}

# Start udev on s390x
if ($arch eq "s390x") {
	print $inifile <<EOMS;
# Start udev to find devices attached to node
# This script can be found in /lib/mkinitrd
echo "Creating device nodes with udev"
echo `/sbin/udevd --daemon`
echo `/sbin/udevadm trigger`
echo `/sbin/udevadm settle --timeout=10`
EOMS
}

   print $inifile <<EOMS;
netstart
while ! ifconfig | grep inet; do
    echo -e "\${RED}Failed to acquire address, retrying \${RESET}"
    sleep 1
    netstart
done
ip addr add dev lo 127.0.0.1/8
ip link set 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
            sleep 5 #should be random, exponential for scale
            rm -f \$FILENAME
          fi
        done
        NFS=0
      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
   elif [[ "\$KEY" == NFSROOT ]]; then # for NFSROOT
        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
	NFSROOT=1
	VALUE=`echo \$i |awk -F= '{print \$2}'`
	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
done

# show xCAT logo
fancydisplay

# begin NFSROOT/Statelite code
if [ "\$NFSROOT" = "1" ]; then
    echo Setting up Statelite
    # for loop back mounting capability!
    mknod /dev/loop0 b 7 0
    mkdir -p \$NEWROOT
    MAXTRIES=15
    ITER=0
    ME=`hostname`
    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're dead.  rpower \$ME boot to play again."
            echo "Possible problems:
1.  This initrd wasn't created for statelite node?  rerun genimage with the -m statelite flag, then rerun 'nodeset \$ME statelite'
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

# now we need to mount the rest of the system.  This is the read/write portions
#echo "Mounting Snapshot directories"
    if [ ! -e "\$NEWROOT/\$RWDIR" ]
    then
        echo ""
        echo -e "\${RED}Hmmm... this NFS root directory doesn't have a /\$RWDIR directory for me to mount a rw filesystem.  You'd better create it... \${NORMAL}"
        echo "."
        shell
    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 create this image with the -m statelite mode"
        echo ""
        shell
    done
    grep '\\(shell\\)' /proc/cmdline >/dev/null && shell
    mount -t tmpfs rw -o mode=$permission \$NEWROOT/\$RWDIR
    mkdir -p \$NEWROOT/\$RWDIR/tmpfs

    #mount the /root/.ssh, it needs more strict permission in order for ssh work
    if [ ! -e "\$NEWROOT/root/.ssh" ]
    then
        mkdir -p \$NEWROOT/root/.ssh
    fi
    mount -t tmpfs -o mode=755 ssh \$NEWROOT/root/.ssh

    # 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,tcp
        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

    grep '\\(shell\\)' /proc/cmdline >/dev/null && shell

    # have to preserve the initial DHCP request. So we  link it.
    # SLES uses different file to store DHCP info
    if [ ! -d \$NEWROOT/\$RWDIR/tmpfs/var/lib/dhcpcd ]
    then
        mkdir -p \$NEWROOT/\$RWDIR/tmpfs/var/lib/dhcpcd
    fi
    cp -fp /var/lib/dhcpcd/dhcpcd-$prinic.info \${NEWROOT}/\${RWDIR}/tmpfs/var/lib/dhcpcd/dhcpcd-$prinic.info
    
    [ -e /etc/ntp.conf ] && mkdir -p \$NEWROOT/\$RWDIR/tmpfs/etc && cp /etc/ntp.conf \$NEWROOT/\$RWDIR/tmpfs/etc/

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

    # now that everything is mounted, lets do this
    # hmmm, apparently I'm checking this twice... so I'd better
    # be really sure the file is there.
    while [ ! -e \$NEWROOT/etc/init.d/statelite ]
    do
        echo "\$NEWROOT/etc/init.d/statelite does not exist in image!"
        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
    export fastboot=yes
    export READONLY=yes
    grep '\\(shell\\)' /proc/cmdline >/dev/null && shell
    mount -n --bind /dev /sysroot/dev
    umount /sys
    umount /proc
    
    # sles use the standard utility to chroot
    if ! exec /usr/bin/chroot \$NEWROOT /sbin/init
    then
        echo ""
        echo -e "\${RED}Couldn't chroot.  Something must be wrong with NFS root image.\${RESET}"
        shell
    fi
    exit
fi
# end NFSROOT/Statelite code

if [ "\$NFS" = "1" ]; then
  echo Setting up nfs with ram overlay.
  mknod /dev/loop0 b 7 0
  mkdir -p /ro
  mkdir -p /rw
  #NOTE: should prob have max count
  while [ ! -d /ro/bin ]; do
    echo mounting \$SERVER:\$ROOTDIR on /ro
    mount \$SERVER:\$ROOTDIR /ro -r -n -o nolock,rsize=32768,udp,nfsvers=3,timeo=14
    ST=`expr \$RANDOM % 5`
    sleep \$ST
  done
  mount -t tmpfs rw /rw
  mkdir -p /rw/etc
  mkdir -p /rw/var/lib/dhcpcd
  mount -t aufs -o dirs=/rw:/ro mergedroot  /sysroot
  mkdir -p /sysroot/ro
  mkdir -p /sysroot/rw
  mount --move /ro /sysroot/ro
  mount --move /rw /sysroot/rw
elif [ -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 /sysroot
  mkdir -p /sysroot/ro
  mkdir -p /sysroot/rw
  mount --move /ro /sysroot/ro
  mount --move /rw /sysroot/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 -t tmpfs rootfs /sysroot\n";
   } else {
      print $inifile "  mount -t tmpfs rootfs /sysroot\n";
   }
   print $inifile "  cd /sysroot\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 1\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 "mkdir /sysroot/var/lib/dhcpcd/\n";	#neccessary for SLES11, not sure for SLES10
   print $inifile "cp /var/lib/dhcpcd/* /sysroot/var/lib/dhcpcd/\n";
   print $inifile "cp /etc/resolv.conf /sysroot/etc/\n";
   print $inifile "cp /etc/HOSTNAME /sysroot/etc/\n";
   print $inifile "mknod /sysroot/dev/console c 5 1\n";
   print $inifile "exec /lib/mkinitrd/bin/run-init -c /dev/console /sysroot /sbin/init\n";
   close($inifile);
   open($inifile,">"."/tmp/xcatinitrd.$$/bin/netstart");
   print $inifile "#!/bin/bash\n";
   print $inifile "dhcpcd $prinic\n";

   #-- Bring other NICs up in /bin/netstart in initrd for NIC failover
   foreach (split /,/,$othernics) {
      if (/^$/) { next; }
      print $inifile "dhcpcd $_\n";
   }

   print $inifile <<END;
cat /var/lib/dhcpcd/*info | grep HOSTNAME | uniq | awk -F= '{print \$2}'| sed \"s/'//g\" >> /etc/HOSTNAME
END

   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,[$_,"lib/$_"];
     }
   }
    if($mode eq "statelite") {
        foreach ("sbin/ifconfig", "usr/bin/clear", "sbin/mount.nfs","sbin/umount.nfs","bin/hostname","usr/bin/egrep","bin/ln","bin/ls","usr/bin/dirname","usr/bin/expr","usr/bin/chroot","usr/bin/grep","bin/cpio","bin/sleep","bin/mount","bin/umount","sbin/dhcpcd","bin/bash","sbin/insmod","bin/mkdir","bin/mknod","sbin/ip","bin/cat","usr/bin/awk","usr/bin/wget","bin/cp","usr/bin/cpio","usr/bin/zcat","usr/bin/gzip","lib/mkinitrd/bin/run-init","usr/bin/uniq","usr/bin/sed","usr/bin/wc") {
            getlibs($_); 
            push @filestoadd,$_;
        } 
        
        # 'sbin/udevd' and 'sbin/udevadm' needed on s390x 
    	if ($arch eq "s390x") {
    		foreach ("sbin/udevd", "sbin/udevadm", "usr/bin/readlink") {
    			getlibs($_); 
            	push @filestoadd,$_;
    		}
    	} 
    }else {
        foreach ("sbin/ifconfig","usr/bin/clear", "usr/bin/grep","bin/cpio","bin/sleep","bin/mount","sbin/dhcpcd","bin/bash","sbin/insmod","bin/mkdir","bin/mknod","sbin/ip","bin/cat","usr/bin/awk","usr/bin/wget","bin/cp","usr/bin/cpio","usr/bin/zcat","usr/bin/gzip","lib/mkinitrd/bin/run-init","usr/bin/uniq","usr/bin/sed") {
            getlibs($_); 
            push @filestoadd,$_;
        }
    }
   if ($arch =~ /x86_64/) {
      push @filestoadd,"lib64/libnss_dns.so.2";
   }
   else {
      push @filestoadd,"lib/libnss_dns.so.2";
   }

    # cross-platfrom support on power6&7 etc
    # ldd can't handle such one scenario: mn is power6, the target platform is power7
   if ($arch =~ /ppc64/) {
      system("cp -a -r $rootimg_dir/lib64/* /tmp/xcatinitrd.$$/lib64/");
   }


   push @filestoadd,keys %libhash;
	if($basekernelver ne $kernelver) {
		system("rm -rf $rootimg_dir/lib/modules/$basekernelver");
        unless (-d "$rootimg_dir/lib/modules/$kernelver") {
		    if(-d "/lib/modules/$kernelver") {
		    	system("cd /lib/modules;cp -r $kernelver $rootimg_dir/lib/modules/");
		    }
		    else {
		    	xdie("Cannot read /lib/modules/$kernelver");
		    }
        }
	}
   find(\&isnetdriver, <$rootimg_dir/lib/modules/$kernelver/*>);
   foreach (@filestoadd) {
      if (ref($_)) {
         #print "$_->[0], $_->[1]\n";
         my $srcpath = "$rootimg_dir/".$_->[0];
         if (-f "$customdir/".$_->[0]) {
            $srcpath="$customdir/".$_->[0];
         } elsif (-f "$pathtofiles/".$_->[0]) {
            $srcpath="$pathtofiles/".$_->[0];
         }
         copy($srcpath,"/tmp/xcatinitrd.$$/".$_->[1]);
         chmod 0755,"/tmp/xcatinitrd.$$/".$_->[1];
      } else {
         #print "$_\n";
         my $srcpath = "$rootimg_dir/$_";
         if (-f "$customdir/$_") {
            $srcpath = "$customdir/$_";
         } elsif (-f "$pathtofiles/$_") {
            $srcpath = "$pathtofiles/$_";
         }
         copy("$srcpath","/tmp/xcatinitrd.$$/$_");
         chmod 0755,"/tmp/xcatinitrd.$$/".$_;
      }
   }

	# Copy udev libraries on s390x
	if ($arch eq "s390x") {
		system("mkdir -p /tmp/xcatinitrd.$$/etc/udev");
		system("cp -r $rootimg_dir/etc/udev/* /tmp/xcatinitrd.$$/etc/udev");
		
		# Copy rules for network adapter
		my $name = `cat /etc/sysconfig/network/ifcfg-$prinic | grep NAME`;
		my $nic = '';
		if ($name =~ m/(\d+\.\d+\.\d+)/g) {
			$nic = $&;
		}
		system("cp -r /etc/udev/rules.d/*$nic.rules /tmp/xcatinitrd.$$/etc/udev/rules.d");
		system("cp -r /etc/udev/rules.d/*persistent-net.rules /tmp/xcatinitrd.$$/etc/udev/rules.d");
		
		system("mkdir -p /tmp/xcatinitrd.$$/lib/udev");
		system("cp -r $rootimg_dir/lib/udev/* /tmp/xcatinitrd.$$/lib/udev");
	}

   #copy("$rootimg_dir/lib/modules/*d","/tmp/xcatinitrd.$$/$_");
   system("cd /tmp/xcatinitrd.$$/bin/; ln -sf bash sh");	#neccessary for SLES11
   system("cd /tmp/xcatinitrd.$$;find .|cpio -H newc -o|gzip -9 -c - > $destdir/initrd.gz");
   system("rm -rf /tmp/xcatinitrd.$$");

}

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 { # TODO: customized postscripts
   generic_post();
    if($mode eq "statelite") {
        if( ! -d "$rootimg_dir/opt/xcat/") {
            mkdir "$rootimg_dir/opt/xcat/";
        }
        copy ("$installroot/postscripts/xcatdsklspost", "$rootimg_dir/opt/xcat/");
        chmod '0755', "$rootimg_dir/opt/xcat/xcatdsklspost";
        #system("$XCATROOT/share/xcat/netboot/add-on/statelite/add_passwd $rootimg_dir");
        #system("$XCATROOT/share/xcat/netboot/add-on/statelite/add_ssh $rootimg_dir");
    }
}

sub generic_post { #This function is meant to leave the image in a state approximating a normal install
   my $cfgfile;
    if($mode ne "statelite") {
        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 $cfgfile "sysfs   /sys     sysfs    defaults       0 0\n";
        if ($tmplimit) {
            print $cfgfile "tmpfs   /tmp     tmpfs    defaults       0 0\n";
            print $cfgfile "tmpfs   /var/tmp     tmpfs    defaults       0 0\n";
        }
        close($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);
   open($cfgfile,">","$rootimg_dir/etc/sysconfig/network/ifcfg-$prinic");
   print $cfgfile "ONBOOT=yes\nBOOTPROTO=dhcp\nDEVICE=$prinic\nSTARTMODE=auto\n";
   close($cfgfile);
   foreach (split /,/,$othernics) {
      if (/^$/) { next; }
      open($cfgfile,">","$rootimg_dir/etc/sysconfig/network/ifcfg-$_");
      print $cfgfile "ONBOOT=yes\nBOOTPROTO=dhcp\nDEVICE=$_\nSTARTMODE=auto\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";
   		print $cfgfile "console\n";
   		close($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/";
   }
   
	# gettyset is not found on s390x
	if ($arch ne "s390x") {
		open( $cfgfile, ">", "$rootimg_dir/etc/init.d/gettyset" );
		print $cfgfile "#!/bin/bash\n";
		print $cfgfile "### BEGIN INIT INFO\n";
		print $cfgfile "# Provides: gettyset\n";
		print $cfgfile "# Required-Start: sshd\n";
		print $cfgfile "# Required-Stop:\n";
		print $cfgfile "# Default-Start: 3\n";
		print $cfgfile "# Default-Stop: 0 1 2 6\n";
		print $cfgfile "# Short-Description: gettyset\n";
		print $cfgfile "# Description:\n";
		print $cfgfile "### END INIT INFO\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 "     echo xco:2345:respawn:/sbin/agetty \$FLOWFLAG \$COTTY \$COSPEED xterm >> /etc/inittab\n";
		print $cfgfile "     init q\n";
		print $cfgfile "  fi\n";
		print $cfgfile "done\n";
		print $cfgfile "/etc/init.d/boot.localnet start\n";
	
		close($cfgfile);
		chmod( 0755, "$rootimg_dir/etc/init.d/gettyset" );
	}

    copy("$installroot/postscripts/xcatpostinit", "$rootimg_dir/etc/init.d/xcatpostinit");
    chmod(0755, "$rootimg_dir/etc/init.d/xcatpostinit");
    system("chroot $rootimg_dir insserv gettyset xcatpostinit");
	
   my $rc = system("grep sshd $rootimg_dir/etc/init.d/.depend.start");
   if ($rc) {
      system("sed -i '".'s/^\(TARGETS = .*\)$/\1 sshd/'."' $rootimg_dir/etc/init.d/.depend.start");
      system("ln -s ../sshd $rootimg_dir/etc/init.d/rc3.d/S20sshd");
   }
   my $rc = system("grep gettyset $rootimg_dir/etc/init.d/.depend.start");
   if ($rc) {
      system("sed -i '".'s/^\(TARGETS = .*\)$/\1 gettyset/'."' $rootimg_dir/etc/init.d/.depend.start");
      system("ln -s ../gettyset $rootimg_dir/etc/init.d/rc3.d/S60gettyset");
   }
}


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

#load the driver update disk, and return the driver names by loading order
sub load_dd()
{
    # check the Driver Update Disk images, it can be .img or .iso
    if (! -d "$installroot/driverdisk/$osver/$arch") {
        return ();
    }

    my @dd_list = `find $installroot/driverdisk/$osver/$arch -type f`;
    chomp(@dd_list);

    if (! @dd_list) {
        return ();
    }

    # Create the work space, it should be cleaned at end of genimage
    my $dd_dir = mkdtemp("/tmp/ddtmpXXXXXXX");
    mkpath "$dd_dir/mnt";
    mkpath "$dd_dir/mods";

    my @dd_drivers = ();    #dirver names
    
    # Load drivers from each Driver Disk
    # For multiple dd, if want to make it has order, rename the dd with a number
    # ahead of the name like 0_xx, 1_xx
    foreach my $dd (sort(@dd_list)) {
        my $rc = system ("mount -o loop $dd $dd_dir/mnt");
        if ($rc) {
            print "mount the Driver Disk $dd failed.\n";
            next;
        }
    
        mkpath "$dd_dir/full";
        
        # Copy out the drivers
        opendir(DIR, "$dd_dir/mnt") || die "Cannot open dir $dd_dir/mnt";
        while (my $dir = readdir(DIR)) {
            if ($dir =~ /^\./) { next; }

            # Every driver update disk can have multiple directories, each directory
            # has the directory format like /linux/[distribution]/[architechture]-[version]/
            # If the directory name is numeric, then it will be used as order to load the  
            # the dirviers inside.
            # For the directory name which is not numeric, copy them to directory 0. It will be 
            # loaled first.
            if ($dir !~ /^\d*$/) {  
                mkpath "$dd_dir/full/0";
                system ("cp -rf $dd_dir/mnt/$dir $dd_dir/full/0");
            } else {
                system ("cp -rf $dd_dir/mnt/$dir $dd_dir/full/");
            }
        }
        closedir(DIR);
    
        # Get all the kernel modules base on the order of directory name.
        
        # The structure of dd: <order>/linux/[distribution]/[architechture]-[version]/

        # The supported arch: i386, ia64, ppc, ppc64, s390, s390x sparc or x86_64.
        my $darch = $arch;
        if ($darch =~ /^x86$/) {
            $darch = "i386";
        }
        
        # If the version is os version. If the os is "sles11.1", the possible os version
        # could be "sles11.1", "11.1", "11", "sles11"
        my @distro = ($osver);
        my $distro1 = $osver;
        $distro1 =~ s/[^\d]*//;
        push @distro,$distro1;
        my $distro2 = $distro1;
        $distro2 =~ s/\..*//;
        push @distro,$distro2;
        my $distro3 = $osver;
        $distro3 =~ s/\..*//;
        push @distro,$distro3;

        opendir (FDIR, "$dd_dir/full") || die "Cannot open dir $dd_dir/full";
        my @fulldir = readdir(FDIR);
        closedir (FDIR);

        # Create the directory for drivers from driver disk
        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 and get the driver loading order
        foreach my $dir (sort(@fulldir)) {
            if ($dir =~ /^\./) { next; }
            my $vdir;
            foreach (@distro) {
                if (-d "$dd_dir/full/$dir/linux/suse/$darch-$_") {
                    $vdir = "$dd_dir/full/$dir/linux/suse/$darch-$_";
                }
            }
            if (! $vdir) { next; }

            # Use the module_order if it has
            if (-f "$vdir/modules/module.order") {
                open(ORDER, "<", "$vdir/modules/module.order");
                while (my $file = <ORDER>) {
                    chomp ($file);
                    if (-f "$vdir/modules/$file") {
                        $driver_name = $file;
                        $real_path = "";
                        find(\&get_path, <$rootimg_dir/lib/modules/$kernelver/*>);
                        if ($real_path eq "") {
                            system ("cp $vdir/modules/$file $rootimg_dir/lib/modules/$kernelver/kernel/drivers/driverdisk");
                        } else {
                            system ("cp $vdir/modules/$file $real_path");
                        }
                        
                        push @dd_drivers, $file;
                    }
                }
            } else {
                opendir (MDIR, "$vdir/modules") || die "Cannot open dir $vdir/modules";
                while (my $file = readdir(MDIR)) {
                    if (-f "$vdir/modules/$file" && $file =~ /\.ko/) {
                        $driver_name = $file;
                        $real_path = "";
                        find(\&get_path, <$rootimg_dir/lib/modules/$kernelver/*>);
                        if ($real_path eq "") {
                            system ("cp $vdir/modules/$file $rootimg_dir/lib/modules/$kernelver/kernel/drivers/driverdisk");
                        } else {
                            system ("cp $vdir/modules/$file $real_path");
                        }
                        
                        push @dd_drivers, $file;
                    }
                }
            }
        }
    
        rmtree "$dd_dir/full";
    
        my $rc = system ("umount -f $dd_dir/mnt");
        if ($rc) {
            print "umount the directory $dd_dir/mnt failed\n";
            exit 1;
        }
    }

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

    # Clean the env
    rmtree "$dd_dir";

    return @dd_drivers;
}