# IBM(c) 2007 EPL license http://www.eclipse.org/legal/epl-v10.html
package xCAT_plugin::grub2;
use Data::Dumper;
use Sys::Syslog;
use xCAT::Scope;
use xCAT::Utils;
use xCAT::TableUtils;
use xCAT::ServiceNodeUtils;
use xCAT::NetworkUtils;
use xCAT::MsgUtils;
use File::Path;
use Socket;
use Getopt::Long;
use xCAT::Table;

my $request;
my %breaknetbootnodes;
our %normalnodes;
my %tftpserverip;
my $callback;
my $sub_req;
my $globaltftpdir = xCAT::TableUtils->getTftpDir();


my %usage = (
    "nodeset" => "Usage: nodeset <noderange> [install|shell|boot|runcmd=bmcsetup|netboot|iscsiboot|osimage[=<imagename>]|offline]",
);
sub handled_commands {
    return {
        nodeset => "noderes:netboot"
    }
}

sub check_dhcp {
    return 1;
    #TODO: omapi magic to do things right
    my $node = shift;
    my $dhcpfile;
    open ($dhcpfile,$dhcpconf);
    while (<$dhcpfile>) {
        if (/host $node\b/) {
            close $dhcpfile;
            return 1;
        }
    }
    close $dhcpfile;
    return 0;
}

sub _slow_get_tftpdir { #make up for paths where tftpdir is not passed in
    my $node=shift;
    my $nrtab = xCAT::Table->new('noderes',-create=>0); #in order to detect per-node tftp directories
    unless ($nrtab) { return $globaltftpdir; }
    my $ent = $nrtab->getNodeAttribs($node,["tftpdir"]);
    if ($ent and $ent->{tftpdir}) {
	    return $ent->{tftpdir};
    } else {
        return $globaltftpdir;
    }
}
sub getstate {
    my $node = shift;
    my $tftpdir = shift;
    unless ($tftpdir) { $tftpdir = _slow_get_tftpdir($node); }
    if (check_dhcp($node)) {
        if (-r $tftpdir . "/boot/grub2/".$node) {
            my $fhand;
            open ($fhand,$tftpdir . "/boot/grub2/".$node);
            my $headline = <$fhand>;
            close $fhand;
            $headline =~ s/^#//;
            chomp($headline);
            return $headline;
        } else {
            return "boot";
        }
    } else {
        return "discover";
    }
}

sub setstate {
=pod

  This function will manipulate the grub structure to match what the noderes/chain tables indicate the node should be booting.

=cut
    my $node = shift;
    my %bphash = %{shift()};
    my %chainhash = %{shift()};
    my %machash = %{shift()};
    my $tftpdir = shift;
    my %nrhash = %{shift()};
    my $linuximghash = shift();
    my $kern = $bphash{$node}->[0]; #$bptab->getNodeAttribs($node,['kernel','initrd','kcmdline']);
    if ($kern->{kcmdline} =~ /!myipfn!/) {
        my $ipfn = xCAT::NetworkUtils->my_ip_facing($node);
        unless ($ipfn) {
            my $servicenodes = $nrhash{$node}->[0];
            if ($servicenodes and $servicenodes->{servicenode}) {
                my @sns = split /,/, $servicenodes->{servicenode};
                foreach my $sn ( @sns ) {
                    # We are in the service node pools, print error if no facing ip.
                    if (xCAT::InstUtils->is_me($sn)) {
                        my @myself = xCAT::NetworkUtils->determinehostname();
                        my $myname = $myself[(scalar @myself)-1];
                        $::callback->(
                            {
                            error => [
                            "$myname: Unable to determine the image server for $node on service node $sn"
                            ],
                            errorcode => [1]
                            }
                        );
                        return;
                    }
                }
            } else {
                $::callback->(
                            {
                            error => [
                            "$myname: Unable to determine the image server for $node"
                            ],
                            errorcode => [1]
                            }
                        );
                return;
            }
        } else {
            $kern->{kcmdline} =~ s/!myipfn!/$ipfn/g;
        }
    }
    if ($kern->{addkcmdline}) {
        $kern->{kcmdline} .= " ".$kern->{addkcmdline};
    }
    
    if($linuximghash and $linuximghash->{'addkcmdline'})
    {
        unless($linuximghash->{'boottarget'}) 
        {
            $kern->{kcmdline} .= " ".$linuximghash->{'addkcmdline'};
        } 
    }
  
    my $pcfg;
    unless (-d "$tftpdir/boot/grub2") {
       mkpath("$tftpdir/boot/grub2");
    }
    my $nodemac;
    my %client_nethash = xCAT::DBobjUtils->getNetwkInfo( [$node] );
  
    open($pcfg,'>',$tftpdir."/boot/grub2/".$node);
    my $cref=$chainhash{$node}->[0]; #$chaintab->getNodeAttribs($node,['currstate']);
    if ($cref->{currstate}) {
       print $pcfg "#".$cref->{currstate}."\n";
    }
    print $pcfg "set timeout=5\n";
    
    $normalnodes{$node}=1; #Assume a normal netboot (well, normal dhcp, 
                       #which is normally with a valid 'filename' field,
                       #but the typical ppc case will be 'special' makedhcp
                       #to clear the filename field, so the logic is a little
                       #opposite
    
    if ($cref and $cref->{currstate} eq "boot") {
       $breaknetbootnodes{$node}=1;
       delete $normalnodes{$node}; #Signify to omit this from one makedhcp command
       close($pcfg);
    } elsif ($kern and $kern->{kernel}) {
       #It's time to set grub configuration for this node to boot the kernel..
       #get tftpserver
       my $tftpserver;
       if (defined ($nrhash{$node}->[0]) && $nrhash{$node}->[0]->{'tftpserver'}) {
           $tftpserver = $nrhash{$node}->[0]->{'tftpserver'};
       } elsif (defined ($nrhash{$node}->[0]) && $nrhash{$node}->[0]->{'xcatmaster'}) {
           $tftpserver = $nrhash{$node}->[0]->{'xcatmaster'};
       } else {
           my @master = xCAT::TableUtils->get_site_attribute("master");
           $tftpserver = $master[0]; 
       }
       my $serverip;
       if (defined ($tftpserverip{$tftpserver})) {
           $serverip = $tftpserverip{$tftpserver};
       } else {
           $serverip = xCAT::NetworkUtils->getipaddr($tftpserver); 
           unless ($serverip) {
               syslog("local1|err","xCAT unable to resolve $tftpserver");
               return;
           }
           $tftpserverip{$tftpserver} = $serverip;
       }
       print $pcfg "set default=\"xCAT OS Deployment\"\n";
       print $pcfg "menuentry \"xCAT OS Deployment\" {\n";
       print $pcfg "    insmod http\n";
       print $pcfg "    insmod tftp\n";
       print $pcfg "    set root=http,$serverip\n";
       print $pcfg "    echo Loading Install kernel ...\n";
       if ($kern and $kern->{kcmdline}) {
           print $pcfg "    linux $tftpdir/$kern->{kernel} $kern->{kcmdline}\n";
       } else {
           print $pcfg "    linux $tftpdir/$kern->{kernel}\n";
       }
       print $pcfg "    echo Loading initial ramdisk ...\n";
       if ($kern and $kern->{initrd}) {
         print $pcfg "    initrd $tftpdir/$kern->{initrd}\n";
       }
       
       print $pcfg "}";
       close($pcfg);
       my $inetn = xCAT::NetworkUtils->getipaddr($node);
       unless ($inetn) {
           syslog("local1|err","xCAT unable to resolve IP for $node in grub2 plugin");
           return;
       }
    } else { 
       close($pcfg);
    }
    my $ip = xCAT::NetworkUtils->getipaddr($node);
    unless ($ip) {
       syslog("local1|err","xCAT unable to resolve IP in grub2 plugin");
       return;
    }
    my $mactab = xCAT::Table->new('mac');
    my %ipaddrs;
    $ipaddrs{$ip} = 1;
    if ($mactab) {
     my $ment = $machash{$node}->[0]; #$mactab->getNodeAttribs($node,['mac']);
     if ($ment and $ment->{mac}) {
       my @macs = split(/\|/,$ment->{mac});
       foreach (@macs) {
          $nodemac = $_;
          if (/!(.*)/) {
             my $ipaddr = xCAT::NetworkUtils->getipaddr($1);
             if ($ipaddr) {
              $ipaddrs{$ipaddr} = 1;
             }
          }
       }
     }
    }
    # Do not use symbolic link, p5 does not support symbolic link in /tftpboot
    #  my $hassymlink = eval { symlink("",""); 1 };
    foreach $ip (keys %ipaddrs) {
        my @ipa=split(/\./,$ip);
        my $pname = "grub.cfg-" . sprintf("%02x%02x%02x%02x",@ipa);
        unlink($tftpdir."/boot/grub2/".$pname);
        link($tftpdir."/boot/grub2/".$node,$tftpdir."/boot/grub2/".$pname);
    }
  
    if ($nodemac =~ /:/) {
        my $tmp = lc($nodemac);
        $tmp =~ s/(..):(..):(..):(..):(..):(..)/$1-$2-$3-$4-$5-$6/g;
        my $pname = "grub.cfg-01-" . $tmp;
        unlink($tftpdir."/boot/grub2/".$pname);
        link($tftpdir."/boot/grub2/".$node,$tftpdir."/boot/grub2/".$pname); 
    }
    return;      
}

my $errored = 0;
sub pass_along { 
    my $resp = shift;
    
    $callback->($resp);
    if ($resp and ($resp->{errorcode} and $resp->{errorcode}->[0]) or ($resp->{error} and $resp->{error}->[0])) {
        $errored=1;
    }
    foreach (@{$resp->{node}}) {
       if ($_->{error} or $_->{errorcode}) {
          $errored=1;
       }
    }
}

  
sub preprocess_request {
    my $req = shift;
    if ($req->{_xcatpreprocessed}->[0] == 1) { return [$req]; }

    my $callback1 = shift;
    my $command  = $req->{command}->[0];
    my $sub_req = shift;
    my @args=();
    if (ref($req->{arg})) {
	@args=@{$req->{arg}};
    } else {
	@args=($req->{arg});
    }
    @ARGV = @args;
    my $nodes = $req->{node};
    #use Getopt::Long;
    Getopt::Long::Configure("bundling");
    Getopt::Long::Configure("pass_through");
    if (!GetOptions('h|?|help'  => \$HELP, 'v|version' => \$VERSION) ) {
      if($usage{$command}) {
          my %rsp;
          $rsp{data}->[0]=$usage{$command};
          $callback1->(\%rsp);
      }
      return;
    }

    if ($HELP) { 
        if($usage{$command}) {
            my %rsp;
            $rsp{data}->[0]=$usage{$command};
            $callback1->(\%rsp);
        }
        return;
    }

    if ($VERSION) {
        my $ver = xCAT::Utils->Version();
        my %rsp;
        $rsp{data}->[0]="$ver";
        $callback1->(\%rsp);
        return; 
    }

    if (@ARGV==0) {
        if($usage{$command}) {
            my %rsp;
            $rsp{data}->[0]=$usage{$command};
            $callback1->(\%rsp);
        }
        return;
    }


   #Assume shared tftp directory for boring people, but for cool people, help sync up tftpdirectory contents when 
   #if they specify no sharedtftp in site table
   my @entries =  xCAT::TableUtils->get_site_attribute("sharedtftp");
   my $t_entry = $entries[0];
   
   if ( defined($t_entry)  and ($t_entry eq "0" or $t_entry eq "no" or $t_entry eq "NO")) {
      # check for  computenodes and servicenodes from the noderange, if so error out
      my @SN;
      my @CN;
      xCAT::ServiceNodeUtils->getSNandCPnodes(\@$nodes, \@SN, \@CN);
      unless (($args[0] eq 'stat') or ($args[0] eq 'enact')) {
        if ((@SN > 0) && (@CN >0 )) { # there are both SN and CN
            my $rsp;
            $rsp->{data}->[0] = 
              "Nodeset was run with a noderange containing both service nodes and compute nodes. This is not valid. You must submit with either compute nodes in the noderange or service nodes. \n";
            xCAT::MsgUtils->message("E", $rsp, $callback1);       
            return; 
           
        } 
      } 

      $req->{'_disparatetftp'}=[1];
      if ($req->{inittime}->[0]) {
          return [$req];
      }
      if (@CN >0 ) { # if compute nodes broadcast to all servicenodes
          return xCAT::Scope->get_broadcast_scope($req,@_);
      }
   }
   return [$req];
}

sub process_request {
    $request = shift;
    $callback = shift;
    $::callback=$callback;
    $sub_req = shift;
    my $command  = $request->{command}->[0];
    %breaknetbootnodes=();
    %normalnodes=();
  
    my @args;
    my @nodes;
    my @rnodes;
    if (ref($request->{node})) {
        @rnodes = @{$request->{node}};
    } else {
        if ($request->{node}) { @rnodes = ($request->{node}); }
    }
    unless (@rnodes) {
        if ($usage{$request->{command}->[0]}) {
            $callback->({data=>$usage{$request->{command}->[0]}});
        }
        return;
    }
  
    #if not shared tftpdir, then filter, otherwise, set up everything
    if ($request->{'_disparatetftp'}->[0]) { #reading hint from preprocess_command
        @nodes = ();
        foreach (@rnodes) {
            if (xCAT::NetworkUtils->nodeonmynet($_)) {
               push @nodes,$_;
            } else {
               xCAT::MsgUtils->message("S", "$_: grub2 netboot: stop configuration because of none sharedtftp and not on same network with its xcatmaster.");
            }
        }
    } else {
        @nodes = @rnodes;
    }
  
    # return directly if no nodes in the same network
    unless (@nodes) {
        xCAT::MsgUtils->message("S", "xCAT: grub2 netboot: no valid nodes. Stop the operation on this server.");
        return;
    }
  
    if (ref($request->{arg})) {
        @args=@{$request->{arg}};
    } else {
        @args=($request->{arg});
    }
    
    #now run the begin part of the prescripts
    unless ($args[0] eq 'stat') { # or $args[0] eq 'enact') {
        $errored=0;
        if ($request->{'_disparatetftp'}->[0]) {  #the call is distrubuted to the service node already, so only need to handles my own children
  	  $sub_req->({command=>['runbeginpre'],
  		      node=>\@nodes,
  		      arg=>[$args[0], '-l']},\&pass_along);
        } else { #nodeset did not distribute to the service node, here we need to let runednpre to distribute the nodes to their masters
  	  $sub_req->({command=>['runbeginpre'],   
  		      node=>\@rnodes,
  		      arg=>[$args[0]]},\&pass_along);
        }
        if ($errored) {
  	  my $rsp;
   	  $rsp->{errorcode}->[0]=1;
  	  $rsp->{error}->[0]="Failed in running begin prescripts.\n";
  	  $callback->($rsp);
  	  return; 
        }
    } 
  
    #back to normal business
    my $inittime=0;
    if (exists($request->{inittime})) { $inittime= $request->{inittime}->[0];}
    if (!$inittime) { $inittime=0;}
    $errored=0;
    unless ($args[0] eq 'stat') { # or $args[0] eq 'enact') {
      $sub_req->({command=>['setdestiny'],
  		node=>\@nodes,
  		inittime=>[$inittime],
  		arg=>\@args},\&pass_along);
    }
    if ($errored) { return; }
  
    my $bptab=xCAT::Table->new('bootparams',-create=>1);
    my $bphash = $bptab->getNodesAttribs(\@nodes,['kernel','initrd','kcmdline','addkcmdline']);
    my $chaintab=xCAT::Table->new('chain',-create=>1);
    my $chainhash=$chaintab->getNodesAttribs(\@nodes,['currstate']);
    my $noderestab=xCAT::Table->new('noderes',-create=>1);
    my $nodereshash=$noderestab->getNodesAttribs(\@nodes,['tftpdir']);
    my $mactab=xCAT::Table->new('mac',-create=>1);
    my $machash=$mactab->getNodesAttribs(\@nodes,['mac']);
    my $nrtab=xCAT::Table->new('noderes',-create=>1);
    my $nrhash=$nrtab->getNodesAttribs(\@nodes,['servicenode','tftpserver','xcatmaster']);
    my $typetab=xCAT::Table->new('nodetype',-create=>1);
    my $typehash=$typetab->getNodesAttribs(\@nodes,['os','provmethod','arch','profile']);
    my $linuximgtab=xCAT::Table->new('linuximage',-create=>1);
    my $osimagetab=xCAT::Table->new('osimage',-create=>1);
  
    my $rc;
    my $errstr;
  
    my $tftpdir;
    foreach (@nodes) {
        my %response;
        if ($nodereshash->{$_} and $nodereshash->{$_}->[0] and $nodereshash->{$_}->[0]->{tftpdir}) {
           $tftpdir =  $nodereshash->{$_}->[0]->{tftpdir};
        } else {
           $tftpdir = $globaltftpdir;
        }
        $response{node}->[0]->{name}->[0]=$_;
        if ($args[0] eq 'stat') {
            $response{node}->[0]->{data}->[0]= getstate($_,$tftpdir);
            $callback->(\%response);
        } elsif ($args[0]) { #If anything else, send it on to the destiny plugin, then setstate
            my $ent = $typehash->{$_}->[0]; 
            my $osimgname = $ent->{'provmethod'};
            my $linuximghash=undef;
            unless($osimgname =~ /^(install|netboot|statelite)$/){
                $linuximghash = $linuximgtab->getAttribs({imagename => $osimgname}, 'boottarget', 'addkcmdline');
            }      
      
            ($rc,$errstr) = setstate($_,$bphash,$chainhash,$machash,$tftpdir,$nrhash,$linuximghash);
            if ($rc) {
                $response{node}->[0]->{errorcode}->[0]= $rc;
                $response{node}->[0]->{errorc}->[0]= $errstr;
                $callback->(\%response);
            }
        }
    }# end of foreach node    
  
    my @normalnodeset = keys %normalnodes;
    my @breaknetboot=keys %breaknetbootnodes;
    #print "grub2 :inittime=$inittime; normalnodeset=@normalnodeset; breaknetboot=@breaknetboot\n";
    my %osimagenodehash;
    for my $nn (@normalnodeset){
        #record the os version for node
        my $ent = $typehash->{$nn}->[0];
        my $osimage=$ent->{'provmethod'};
        if($osimage =~ /^(install|netboot|statelite)$/){
           $osimage=($ent->{'os'}).'-'.($ent->{'arch'}).'-'.($ent->{'provmethod'}).'-'.($ent->{'profile'});
        }
        push @{$osimagenodehash{$osimage}}, $nn;
    }
    
    my $do_dhcpsetup=1;
    my @entries =  xCAT::TableUtils->get_site_attribute("dhcpsetup");
    my $t_entry = $entries[0];
    if (defined($t_entry) ) {
        if ($t_entry =~ /0|n|N/) { $do_dhcpsetup=0; }
    }
  
    #Don't bother to try dhcp binding changes if sub_req not passed, i.e. service node build time
    unless (($args[0] eq 'stat') || ($inittime) || ($args[0] eq 'offline')) {
        foreach my $osimage (keys %osimagenodehash) {
            #TOTO check the existence of grub2 executable files for corresponding arch
            my $osimgent = $osimagetab->getAttribs({imagename => $osimage },'osarch');
            my $validarch=undef;
            if($osimgent and $osimgent->{'osarch'}) 
               {
                 $validarch = $osimgent->{'osarch'};
               }
            if ($validarch =~ /ppc64/i)
               {
                   $validarch="ppc"
               }
            my $grub2 = "/boot/grub2/grub2.".$validarch;
            my $tftppath = $tftpdir . $grub2;
            unless (-e "$tftppath") {
               my $rsp;
               push @{$rsp->{data}},
                   "stop configuration, missing $tftppath.\n";
               xCAT::MsgUtils->message("E", $rsp, $callback);       
               return; 
               }
            if ($do_dhcpsetup) {
                if ($request->{'_disparatetftp'}->[0]) { #reading hint from preprocess_command
                    $sub_req->({command=>['makedhcp'],
                         node=>\@{$osimagenodehash{$osimage}},
                         arg=>['-l','-s','filename = \"'.$grub2.'\";']},$callback);
                } else {
                    $sub_req->({command=>['makedhcp'],
                         node=>\@{$osimagenodehash{$osimage}},
                         arg=>['-s','filename = \"'.$grub2.'\";']},$callback);
                }
            }
        } #end of foreach osimagenodehash
        if ($do_dhcpsetup) {
          if ($request->{'_disparatetftp'}->[0]) { #reading hint from preprocess_command
              $sub_req->({command=>['makedhcp'],
               node=>\@breaknetboot,
               arg=>['-l','-s','filename = \"xcat/nonexistant_file_to_intentionally_break_netboot_for_localboot_to_work\";']},$callback);
          } else {
              $sub_req->({command=>['makedhcp'],
               node=>\@breaknetboot,
               arg=>['-s','filename = \"xcat/nonexistant_file_to_intentionally_break_netboot_for_localboot_to_work\";']},$callback);
          }
       }
    }
    
    #now run the end part of the prescripts
    unless ($args[0] eq 'stat') { # or $args[0] eq 'enact') 
        $errored=0;
        if ($request->{'_disparatetftp'}->[0]) {  #the call is distrubuted to the service node already, so only need to handles my own children
  	  $sub_req->({command=>['runendpre'],
  		      node=>\@nodes,
  		      arg=>[$args[0], '-l']},\&pass_along);
        } else { #nodeset did not distribute to the service node, here we need to let runednpre to distribute the nodes to their masters
  	  $sub_req->({command=>['runendpre'],   
  		      node=>\@rnodes,
  		      arg=>[$args[0]]},\&pass_along);
        }
        if ($errored) { 
  	  my $rsp;
  	  $rsp->{errorcode}->[0]=1;
  	  $rsp->{error}->[0]="Failed in running end prescripts\n";
  	  $callback->($rsp);
  	  return; 
        }
    }
}

#----------------------------------------------------------------------------
=head3  getNodesetStates
       returns the nodeset state for the given nodes. The possible nodeset
           states are: netboot, install, boot and discover.
    Arguments:
        nodes  --- a pointer to an array of nodes
        states -- a pointer to a hash table. This hash will be filled by this
             function.The key is the nodeset status and the value is a pointer
             to an array of nodes.  
    Returns:
       (return code, error message)
=cut
#-----------------------------------------------------------------------------
sub getNodesetStates {
    my $noderef=shift;
    if ($noderef =~ /xCAT_plugin::grub2/) {
      $noderef=shift;
    }
    my @nodes=@$noderef;
    my $hashref=shift; 
    my $noderestab = xCAT::Table->new('noderes'); #in order to detect per-node tftp directories
    my %nrhash = %{$noderestab->getNodesAttribs(\@nodes,[qw(tftpdir)])};
    
    if (@nodes>0) {
        foreach my $node (@nodes) {
            my $tftpdir;
            if ($nrhash{$node}->[0] and $nrhash{$node}->[0]->{tftpdir}) {
                $tftpdir = $nrhash{$node}->[0]->{tftpdir};
            } else {
                $tftpdir = $globaltftpdir;
            }
            my $tmp=getstate($node, $tftpdir);
            my @a=split(' ', $tmp);
            $stat = $a[0];
            if (exists($hashref->{$stat})) {
                my $pa=$hashref->{$stat};
                push(@$pa, $node);
            }
            else {
                $hashref->{$stat}=[$node];
            }
        }
    }
    return (0, "");
}

1;