Experiment.pm.in 107 KB
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#!/usr/bin/perl -wT
#
# EMULAB-COPYRIGHT
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# Copyright (c) 2005-2010 University of Utah and the Flux Group.
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# All rights reserved.
#
package Experiment;

use strict;
use Exporter;
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use vars qw(@ISA @EXPORT $AUTOLOAD);
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@ISA    = "Exporter";
@EXPORT = qw ( );

use libdb;
use libtestbed;
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use User;
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use Project;
use Group;
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use Node;
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use Interface;
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use VirtExperiment;
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use Logfile;
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use English;
use Data::Dumper;
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use File::Basename;
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use overload ('""' => 'Stringify');
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use libtblog_simple;
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use vars qw($EXPT_PRELOAD $EXPT_START $EXPT_SWAPIN $EXPT_SWAPUPDATE
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	    $EXPT_SWAPOUT $EXPT_SWAPMOD %physicalTables @virtualTables
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	    $EXPT_FLAGS_NAMESONLY $EXPT_FLAGS_INCLUDEVIRT
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	    $EXPT_FLAGS_LOCALONLY
	    $EXPT_GENIFLAGS_EXPT $EXPT_GENIFLAGS_COOKED
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	    @EXPORT_OK);

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# Configure variables
my $TB		= "@prefix@";
my $BOSSNODE    = "@BOSSNODE@";
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my $CONTROL	= "@USERNODE@";
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my $TBOPS       = "@TBOPSEMAIL@";
my $PROJROOT    = "@PROJROOT_DIR@";
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my $EVENTSYS    = @EVENTSYS@;
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my $STAMPS      = @STAMPS@;
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my $TBBASE      = "@TBBASE@";
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my $TEVC	= "$TB/bin/tevc";
my $DBCONTROL   = "$TB/sbin/opsdb_control";
my $RSYNC	= "/usr/local/bin/rsync";
my $MKEXPDIR    = "$TB/libexec/mkexpdir";
my $TBPRERUN    = "$TB/bin/tbprerun";
my $TBSWAP      = "$TB/bin/tbswap";
my $TBREPORT    = "$TB/bin/tbreport";
my $TBEND       = "$TB/bin/tbend";
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my $DU          = "/usr/bin/du";
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my $MD5         = "/sbin/md5";
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# Swap Actions
$EXPT_PRELOAD		= TBDB_STATS_PRELOAD();
$EXPT_START		= TBDB_STATS_START();
$EXPT_SWAPIN		= TBDB_STATS_SWAPIN();
$EXPT_SWAPOUT		= TBDB_STATS_SWAPOUT();
$EXPT_SWAPMOD		= TBDB_STATS_SWAPMODIFY();
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$EXPT_SWAPUPDATE	= TBDB_STATS_SWAPUPDATE();
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# Other flags.
$EXPT_FLAGS_LOCALONLY   = 0x01;
$EXPT_FLAGS_NAMESONLY   = 0x02;
$EXPT_FLAGS_INCLUDEVIRT = 0x04;

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$EXPT_GENIFLAGS_EXPT    = 0x01;
$EXPT_GENIFLAGS_COOKED  = 0x02;

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# For stats gathering code.
my $EXPT_STARTCLOCK;
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my $EXPT_RESOURCESHOSED = 0;
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# Why, why, why?
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@EXPORT_OK = qw($EXPT_PRELOAD $EXPT_START $EXPT_SWAPUPDATE
		$EXPT_SWAPIN $EXPT_SWAPOUT $EXPT_SWAPMOD
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		$EXPT_GENIFLAGS_EXPT $EXPT_GENIFLAGS_COOKED
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		%physicalTables  @virtualTables);
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#
# List of tables used for experiment removal/backup/restore.
#
@virtualTables  = ("virt_nodes",
		   "virt_lans",
		   "virt_lan_lans",
		   "virt_lan_settings",
		   "virt_lan_member_settings",
		   "virt_trafgens",
		   "virt_agents",
		   "virt_routes",
		   "virt_vtypes",
		   "virt_programs",
		   "virt_node_desires",
		   "virt_node_startloc",
		   "virt_simnode_attributes",
		   "virt_user_environment",
		   "virt_parameters",
		   # vis_nodes is locked during update in prerender, so we
		   # will get a consistent dataset when we backup.
		   "vis_nodes",
		   "vis_graphs",
		   "nseconfigs",
		   "eventlist",
		   "event_groups",
		   "virt_firewalls",
		   "firewall_rules",
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		   "elabinelab_attributes",
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		   "virt_tiptunnels",
		   "ipsubnets");

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%physicalTables = ("delays"     => ["node_id", "vname", "vnode0", "vnode1"],
		   "ipport_ranges" => undef,
		   "v2pmap"        => ["node_id", "vname"],
		   "linkdelays"    => ["node_id", "vlan", "vnode"],
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		   "traces"        => ["node_id", "idx"],
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		   "portmap"       => undef); 
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# These are slots in the node table that need to be restored. 
my @nodetable_fields = ("def_boot_osid",
			"def_boot_path",
			"def_boot_cmd_line",
			"temp_boot_osid",
			"next_boot_osid",
			"next_boot_path",
			"next_boot_cmd_line",
			"pxe_boot_path",
			"bootstatus",
			"ready",
			"rpms",
			"deltas",
			"tarballs",
			"startupcmd",
			"startstatus",
			"failureaction",
			"routertype",
			"op_mode",
			"op_mode_timestamp",
			"allocstate",
			"allocstate_timestamp",
			"next_op_mode",
			"osid",
			"ipport_low",
			"ipport_next",
			"ipport_high",
			"sshdport",
			"rtabid");
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# Hmm, this is silly. 
if ($EVENTSYS) {
    require event;
    import event;
}

# Cache of instances to avoid regenerating them.
my %experiments   = ();
my $debug	  = 0;

# Little helper and debug function.
sub mysystem($)
{
    my ($command) = @_;

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    my $cwd;
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    chomp($cwd = `/bin/pwd`);
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    print STDERR "Running '$command' in $cwd\n"
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	if ($debug);
    return system($command);
}

#
# Lookup an experiment and create a class instance to return.
#
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sub Lookup($$;$)
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{
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    my ($class, $arg1, $arg2) = @_;
    my $idx;

    #
    # A single arg is either an index or a "pid,eid" or "pid/eid" string.
    #
    if (!defined($arg2)) {
	if ($arg1 =~ /^(\d*)$/) {
	    $idx = $1;
	}
	elsif ($arg1 =~ /^([-\w]*),([-\w]*)$/ ||
	       $arg1 =~ /^([-\w]*)\/([-\w]*)$/) {
	    $arg1 = $1;
	    $arg2 = $2;
	}
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	elsif ($arg1 =~ /^\w+\-\w+\-\w+\-\w+\-\w+$/) {
	    my $result =
		DBQueryWarn("select idx from experiments ".
			    "where eid_uuid='$arg1'");

	    return undef
		if (! $result || !$result->numrows);

	    ($idx) = $result->fetchrow_array();
	}
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	else {
	    return undef;
	}
    }
    elsif (! (($arg1 =~ /^[-\w]*$/) && ($arg2 =~ /^[-\w]*$/))) {
	return undef;
    }

    #
    # Two args means lookup by pid,eid instead of exptidx.
    #
    if (defined($arg2)) {
	my $result =
	    DBQueryWarn("select idx from experiments ".
			"where pid='$arg1' and eid='$arg2'");

	return undef
	    if (! $result || !$result->numrows);

	($idx) = $result->fetchrow_array();
    }
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    # Look in cache first
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    return $experiments{"$idx"}
        if (exists($experiments{"$idx"}));
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    my $query_result =
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	DBQueryWarn("select e.*,i.parent_guid,t.guid from experiments as e ".
		    "left join experiment_templates as t on ".
		    "     t.exptidx=e.idx ".
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		    "left join experiment_template_instances as i on ".
		    "     i.exptidx=e.idx ".
		    "where e.idx='$idx'");
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    return undef
	if (!$query_result || !$query_result->numrows);

    my $self         = {};
    $self->{'EXPT'}  = $query_result->fetchrow_hashref();
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    # An Instance?
    $self->{'ISINSTANCE'} = defined($self->{'EXPT'}->{'parent_guid'});
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    # The experiment underlying a template.
    $self->{'ISTEMPLATE'} = defined($self->{'EXPT'}->{'guid'});
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    $query_result =
	DBQueryWarn("select * from experiment_stats where exptidx='$idx'");
	
    return undef
	if (!$query_result || !$query_result->numrows);
    
    $self->{'STATS'} = $query_result->fetchrow_hashref();
    
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    my $rsrcidx = $self->{'STATS'}->{'rsrcidx'};

    $query_result =
	DBQueryWarn("select * from experiment_resources ".
		    "where idx='$rsrcidx'");
	
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    return undef
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	if (!$query_result || !$query_result->numrows);
    
    $self->{'RSRC'} = $query_result->fetchrow_hashref();
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    # Virt Experiment; load lazy.
    $self->{'VIRTEXPT'} = undef;

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    bless($self, $class);
    
    # Add to cache. 
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    $experiments{"$idx"} = $self;
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    return $self;
}
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# To avoid writting out all the methods.
sub AUTOLOAD {
    my $self = shift;
    my $type = ref($self) or die("$self is not an object\n");

    my $name = $AUTOLOAD;
    $name =~ s/.*://;   # strip fully-qualified portion

    if (exists($self->{'EXPT'}->{$name})) {
	return $self->{'EXPT'}->{$name};
    }
    elsif (exists($self->{'STATS'}->{$name})) {
	return $self->{'STATS'}->{$name};
    }
    elsif (exists($self->{'RSRC'}->{$name})) {
	return $self->{'RSRC'}->{$name};
    }
    print STDERR "$self: tried to access unknown slot $name\n";
    return undef;
}
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sub dbrow($$)     { return $_[0]->{'EXPT'}; }
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sub locked($)     { return $_[0]->expt_locked(); }
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sub description($){ return $_[0]->expt_name(); }
sub creator($)    { return $_[0]->expt_head_uid(); }
sub created($)	  { return $_[0]->expt_created(); }
sub swapper($)	  { return $_[0]->expt_swap_uid(); }
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# Break circular reference someplace to avoid exit errors.
sub DESTROY {
    my $self = shift;

    $self->{"EXPT"}     = undef;
    $self->{"STATS"}    = undef;
    $self->{"RSRC"}     = undef;
    $self->{'VIRTEXPT'} = undef;
}
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#
# For canceled, goto to the DB.
#
sub canceled($)
{
    my ($self) = @_;
    
    my $idx = $self->idx();

    my $query_result =
	DBQueryWarn("select canceled from experiments where idx='$idx'");

    if (! $query_result ||
	$query_result->numrows == 0) {
	return 0;
    }
    my ($canceled) = $query_result->fetchrow_array();
    $self->{'EXPT'}->{'canceled'} = $canceled;
    return $canceled;
}

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#
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# Lookup an experiment given an experiment index.
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#
sub LookupByIndex($$)
{
    my ($class, $exptidx) = @_;

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    return Experiment->Lookup($exptidx);
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}

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#
# Equality test. Not strictly necessary in perl, but good form.
#
sub SameExperiment($$)
{
    my ($self, $other) = @_;

    # Must be a real reference. 
    return -1
	if (! (ref($self) && ref($other)));

    return $self->idx() == $other->idx();
}

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#
# All active experiments.
#
sub AllActive($)
{
    my ($class) = @_;
    my @result  = ();
    
    my $query_result =
	DBQueryFatal("select idx from experiments where state='active'");

    while (my ($idx) = $query_result->fetchrow_array()) {
	my $experiment = Experiment->Lookup($idx);

	if (!defined($experiment)) {
	    print STDERR "Experiment::AllActive: No object for $idx!\n";
	}
	push(@result, $experiment);
    }
    return @result;
}

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#
# All experiments for a particular user. Class method.
#
sub UserExperimentList($$$)
{
    my ($class, $user, $plist) = @_;
    my @result  = ();
    my $uid_idx = $user->uid_idx();
    
    my $query_result =
	DBQueryWarn("select idx from experiments ".
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		    "where creator_idx='$uid_idx' or ".
		    "      (swapper_idx='$uid_idx' and ".
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		    "       state!='" . EXPTSTATE_SWAPPED() . "')");
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    return -1
	if (! $query_result);

    while (my ($idx) = $query_result->fetchrow_array()) {
	my $experiment = Experiment->Lookup($idx);

	if (!defined($experiment)) {
	    print STDERR "Experiment::UserExperimentList: ".
		"No object for $idx!\n";
	    return -1;
	}
	push(@result, $experiment);
    }
    @$plist = @result;
    return 0;
}

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# This is needed a lot.
sub unix_gid($)
{
    my ($self) = @_;

    # Must be a real reference. 
    return -1
	if (! ref($self));

    my $group = $self->GetGroup();
    return -1
	if (!defined($group));

    return $group->unix_gid();
}

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#
# LockTables simple locks the given tables, and then refreshes the
# experiment instance (thereby getting the data from the DB after
# the tables are locked).
#
sub LockTables($;$)
{
    my ($self, $spec) = @_;

    # Must be a real reference. 
    return -1
	if (! ref($self));

    $spec  = "experiments write"
	if (!defined($spec));
    $spec .= ", experiment_stats read";
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    $spec .= ", experiment_resources read";
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    DBQueryWarn("lock tables $spec")
	or return -1;
	
    return $self->Refresh();
}
sub UnLockTables($)
{
    my ($self) = @_;

    # Must be a real reference. 
    return -1
	if (! ref($self));

    DBQueryWarn("unlock tables")
	or return -1;
    return 0;
}

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#
# Create a new experiment. This installs the new record in the DB,
# and returns an instance. There is some bookkeeping along the way.
#
sub Create($$$$)
{
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    my ($class, $group, $eid, $argref) = @_;
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    my $exptidx;
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    my $uuid;
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    my $now = time();
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    return undef
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	if (ref($class) || !ref($group));

    my $pid     = $group->pid();
    my $gid     = $group->gid();
    my $pid_idx = $group->pid_idx();
    my $gid_idx = $group->gid_idx();
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    #
    # The pid/eid has to be unique, so lock the table for the check/insert.
    #
    DBQueryWarn("lock tables experiments write, ".
		"            experiment_stats write, ".
		"            experiment_resources write, ".
		"            emulab_indicies write, ".
		"            testbed_stats read")
	or return undef;

    my $query_result =
	DBQueryWarn("select pid,eid from experiments ".
		    "where eid='$eid' and pid='$pid'");

    if ($query_result->numrows) {
	DBQueryWarn("unlock tables");
	tberror("Experiment $eid in project $pid already exists!");
	return undef;
    }

    #
    # Grab the next highest index to use. We used to use an auto_increment
    # field in the table, but if the DB is ever "dropped" and recreated,
    # it will reuse indicies that are crossed referenced in the other two
    # tables.
    #
    $query_result = 
	DBQueryWarn("select idx from emulab_indicies ".
		    "where name='next_exptidx'");

    if (!$query_result) {
	DBQueryWarn("unlock tables");
	return undef;
    }

    # Seed with a proper value.
    if (! $query_result->num_rows) {
	$query_result =
	    DBQueryWarn("select MAX(exptidx) + 1 from experiment_stats");

	if (!$query_result) {
	    DBQueryWarn("unlock tables");
	    return undef;
	}
	($exptidx) = $query_result->fetchrow_array();

	# First ever experiment!
	$exptidx = 1
	    if (!defined($exptidx));

	if (! DBQueryWarn("insert into emulab_indicies (name, idx) ".
			  "values ('next_exptidx', $exptidx)")) {
	    DBQueryWarn("unlock tables");
	    return undef;
	}

    }
    else {
	($exptidx) = $query_result->fetchrow_array();
    }
    my $nextidx = $exptidx + 1;
    
    if (! DBQueryWarn("update emulab_indicies set idx='$nextidx' ".
		      "where name='next_exptidx'")) {
	DBQueryWarn("unlock tables");
	return undef;
    }

    #
    # Lets be really sure!
    #
    foreach my $table ("experiments", "experiment_stats",
		       "experiment_resources", "testbed_stats") {

	my $slot = (($table eq "experiments") ? "idx" : "exptidx");
	
	$query_result =
	    DBQueryWarn("select * from $table where ${slot}=$exptidx");

	if (! $query_result) {
	    DBQueryWarn("unlock tables");
	    return undef;
	}
	if ($query_result->numrows) {
	    DBQueryWarn("unlock tables");
	    tberror("Experiment index $exptidx exists in $table; ".
		    "this is bad!");
	    return undef;
	}
    }

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    # And a UUID (universally unique identifier).
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    if (exists($argref->{'eid_uuid'})) {
	$uuid = $argref->{'eid_uuid'};
	delete($argref->{'eid_uuid'});

	if (! ($uuid =~ /^\w+\-\w+\-\w+\-\w+\-\w+$/)) {
	    DBQueryWarn("unlock tables");
	    print "*** WARNING: Bad format in UUID!\n";
	    return undef;
	}
    }
    else {
	$uuid = NewUUID();
	if (!defined($uuid)) {
	    DBQueryWarn("unlock tables");
	    print "*** WARNING: Could not generate a UUID!\n";
	    return undef;
	}
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    }

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    #
    # Lets be real sure that the UUID is really unique.
    #
    $query_result =
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	DBQueryWarn("select pid,eid from experiments ".
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		    "where eid_uuid='$uuid'");
    if (! $query_result) {
	DBQueryWarn("unlock tables");
	return undef;
    }
    if ($query_result->numrows) {
	DBQueryWarn("unlock tables");
	tberror("Experiment uuid $uuid already exists; ".
		"this is bad!");
	return undef;
    }

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    #
    # Insert the record. This reserves the pid/eid for us. 
    #
    # Some fields special cause of quoting.
    #
    my $description = DBQuoteSpecial($argref->{'expt_name'});
    delete($argref->{'expt_name'});
    my $noswap_reason = DBQuoteSpecial($argref->{'noswap_reason'});
    delete($argref->{'noswap_reason'});
    my $noidleswap_reason = DBQuoteSpecial($argref->{'noidleswap_reason'});
    delete($argref->{'noidleswap_reason'});

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    # we override this below
    delete($argref->{'idx'})
	if (exists($argref->{'idx'}));

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    my $query = "insert into experiments set ".
	join(",", map("$_='" . $argref->{$_} . "'", keys(%{$argref})));

    # Append the rest
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    $query .= ",expt_created=FROM_UNIXTIME('$now')";
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    $query .= ",expt_locked=now(),pid='$pid',eid='$eid',eid_uuid='$uuid'";
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    $query .= ",pid_idx='$pid_idx',gid='$gid',gid_idx='$gid_idx'";
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    $query .= ",expt_name=$description";
    $query .= ",noswap_reason=$noswap_reason";
    $query .= ",noidleswap_reason=$noidleswap_reason";
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    $query .= ",idx=$exptidx";
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    if (! DBQueryWarn($query)) {
	DBQueryWarn("unlock tables");
	tberror("Error inserting experiment record for $pid/$eid!");	
	return undef;
    }

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    my $creator_uid = $argref->{'expt_head_uid'};
    my $creator_idx = $argref->{'creator_idx'};
    my $batchmode   = $argref->{'batchmode'};

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    #
    # Create an experiment_resources record for the above record.
    #
    $query_result =
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	DBQueryWarn("insert into experiment_resources ".
		    "(tstamp, exptidx, uid_idx) ".
		    "values (FROM_UNIXTIME('$now'), $exptidx, $creator_idx)");
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    if (!$query_result) {
	DBQueryWarn("delete from experiments where pid='$pid' and eid='$eid'");
	DBQueryWarn("unlock tables");
	tberror("Error inserting experiment resources record for $pid/$eid!");
	return undef;
    }
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    my $rsrcidx     = $query_result->insertid;
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    #
    # Now create an experiment_stats record to match.
    #
    if (! DBQueryWarn("insert into experiment_stats ".
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		      "(eid, pid, creator, creator_idx, gid, created, ".
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		      " batch, exptidx, rsrcidx, pid_idx, gid_idx, eid_uuid, ".
		      " last_activity) ".
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		      "values('$eid', '$pid', '$creator_uid', '$creator_idx',".
		      "       '$gid', FROM_UNIXTIME('$now'), ".
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		      "        $batchmode, $exptidx, $rsrcidx, ".
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		      "        $pid_idx, $gid_idx, '$uuid', ".
		      "        FROM_UNIXTIME('$now'))")) {
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	DBQueryWarn("delete from experiments where pid='$pid' and eid='$eid'");
	DBQueryWarn("delete from experiment_resources where idx=$rsrcidx");
	DBQueryWarn("unlock tables");
	tberror("Error inserting experiment stats record for $pid/$eid!");
	return undef;
    }

    #
    # Safe to unlock; all tables consistent.
    #
    if (! DBQueryWarn("unlock tables")) {
	DBQueryWarn("delete from experiments where pid='$pid' and eid='$eid'");
	DBQueryWarn("delete from experiment_resources where idx=$rsrcidx");
	DBQueryWarn("delete from experiment_stats where exptidx=$exptidx");
	tberror("Error unlocking tables!");
	return undef
    }

    return Experiment->Lookup($pid, $eid);
}

#
# Delete experiment. Optional purge argument says to remove all trace
# (typically, the stats are kept).
#
sub Delete($;$)
{
    my ($self, $purge) = @_;

    return -1
	if (! ref($self));

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    my $pid     = $self->pid();
    my $eid     = $self->eid();
    my $exptidx = $self->idx();
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    my $workdir = $self->WorkDir();
    my $userdir = $self->UserDir();
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    $purge = 0
	if (!defined($purge));

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    $self->UnBindNonLocalUsers();

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    #
    # Try to remove experiment directory. We allow for it not being there
    # cause we often run the tb programs directly. We also allow for not
    # having permission, in the case that an admin type is running this,
    # in which case it won't be allowed cause of directory permissions. Thats
    # okay since admin types should rarely end experiments in other projects.
    #
    print "Removing experiment directories ... \n";
    if (defined($userdir) && system("/bin/rm -rf $userdir")) {
	print "*** WARNING: Not able to remove $userdir\n";
	print "             Someone will need to do this by hand.\n";
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	# NFS errors usually the result. Sometimes its cause there is
	# someone in the directory, so its being held open.
        libtestbed::SENDMAIL($TBOPS,
			     "Experiment::Delete: Could not remove directory",
			     "Could not remove $userdir.\n".
			     "Someone will need to do this by hand.\n");
    }
    if (system("/bin/rm -rf $workdir")) {
	print "*** WARNING: Not able to remove $workdir\n";
	print "             Someone will need to do this by hand.\n";
    }
    # Yuck.
    if ($pid ne $self->gid()) {
	my $eidlink = "$PROJROOT/$pid/exp/$eid";
	unlink($eidlink)
	    if (-l $eidlink);
    }
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    my $logfile = $self->GetLogFile();
    if (defined($logfile)) {
	$logfile->Delete();
    }
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    libArchive::TBDeleteExperimentArchive($pid, $eid);

    DBQueryWarn("DELETE from experiments ".
		"WHERE eid='$eid' and pid='$pid'");
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    # Delete from cache. 
    delete($experiments{"$exptidx"});

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    #
    # Mark experiment destroyed. This is a backup to End() below.
    #
    if (! defined($self->destroyed())) {
	DBQueryWarn("update experiment_stats set ".
		    "   destroyed=now() ".
		    "where exptidx=$exptidx");
	$self->Refresh();
    }
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    return 0
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	if (! $purge);
    
    #
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    # Now we can clean up the stats and resource records. 
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    #
    my $rsrcidx = $self->rsrcidx();
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    $self->DeleteInputFiles();

    DBQueryWarn("DELETE from experiment_pmapping ".
		"WHERE rsrcidx=$rsrcidx")
	if (defined($rsrcidx) && $rsrcidx);

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    DBQueryWarn("DELETE from experiment_resources ".
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		"WHERE idx=$rsrcidx")
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	if (defined($rsrcidx) && $rsrcidx);
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    DBQueryWarn("DELETE from testbed_stats ".
		"WHERE exptidx=$exptidx");

    # This must be last cause it provides the unique exptidx above.
    DBQueryWarn("DELETE from experiment_stats ".
		"WHERE eid='$eid' and pid='$pid' and exptidx=$exptidx");

    return 0;
}

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#
# Flush from our little cache, as for the expire daemon.
#
sub Flush($)
{
    my ($self) = @_;

    delete($experiments{$self->idx()});
}
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sub FlushAll($)
{
    my ($class) = @_;

    %experiments = ();
}
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#
# Add an input file to the template. The point of this is to reduce
# duplication by taking an md5 of the input file, and sharing that
# record/file.
# 
sub AddInputFile($$;$)
{
    my ($self, $inputfile, $isnsfile) = @_;
    my $input_data_idx;
    my $isnew = 0;

    # Must be a real reference. 
    return -1
	if (! ref($self));

    $isnsfile = 0
	if (! defined($isnsfile));

    return -1
	if (! -r $inputfile);

    my $data_string = `cat $inputfile`;
    return -1
	if ($?);

    my $exptidx  = $self->idx();
    my $rsrcidx  = $self->rsrcidx();

    if ($data_string) {
	# As you can see, we md5 the raw data.
	$data_string = DBQuoteSpecial($data_string);
	if (length($data_string) >= DBLIMIT_NSFILESIZE()) {
	    tberror("Input file is too big (> " . DBLIMIT_NSFILESIZE() . ")!");
	    return -1;
	}

	#
	# Grab an MD5 of the file to see if we already have a copy of it.
	# Avoids needless duplication.
	#
	my $md5 = `$MD5 -q $inputfile`;
	chomp($md5);

	DBQueryWarn("lock tables experiment_input_data write, ".
		    "            experiment_inputs write, ".
		    "            experiment_resources write")
	    or return -1;

	my $query_result =
	    DBQueryWarn("select idx from experiment_input_data ".
			"where md5='$md5'");

	if (!$query_result) {
	    DBQueryWarn("unlock tables");
	    return -1;
	}

	if ($query_result->numrows) {
	    ($input_data_idx) = $query_result->fetchrow_array();
	    $isnew = 0;
	}
	else {
	    $query_result =
		DBQueryWarn("insert into experiment_input_data ".
			    "(idx, md5, input) ".
			    "values (NULL, '$md5', $data_string)");
	    
	    if (!$query_result) {
		DBQueryWarn("unlock tables");
		return -1;
	    }
	    $input_data_idx = $query_result->insertid;
	    $isnew = 1;
	}
	if (! DBQueryWarn("insert into experiment_inputs ".
			  " (rsrcidx, exptidx, input_data_idx) values ".
			  " ($rsrcidx, $exptidx, '$input_data_idx')")) {
	    DBQueryWarn("delete from experiment_input_data ".
			"where idx='$input_data_idx'")
		if ($isnew);
	    DBQueryWarn("unlock tables");
	    return -1;
	}
	if ($isnsfile &&
	    $self->TableUpdate("experiment_resources",
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			       "input_data_idx='$input_data_idx'",
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			       "idx='$rsrcidx'") != 0) {
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	    DBQueryWarn("unlock tables");
	    return -1;
	}
	DBQueryWarn("unlock tables");
    }
    return 0;
}

#
# Delete the input files, but only if not in use.
#
sub DeleteInputFiles($)
{
    my ($self) = @_;

    # Must be a real reference. 
    return -1
	if (! ref($self));

    my $rsrcidx = $self->rsrcidx();
    my $nsidx   = $self->input_data_idx();

    DBQueryWarn("lock tables experiment_input_data write, ".
		"            experiment_resources write, ".
		"            experiment_inputs write")
	or return -1;

    #
    # Get all input files for this rsrc record.
    #
    my $query_result =
	DBQueryWarn("select input_data_idx from experiment_inputs ".
		    "where rsrcidx='$rsrcidx'");
    goto bad
	if (! $query_result);
    goto done
	if (! $query_result->numrows);

    while (my ($input_data_idx) = $query_result->fetchrow_array()) {
	#
	# Delete but only if not in use.
	#
	my $query_result =
	    DBQueryWarn("select count(rsrcidx) from experiment_inputs ".
			"where input_data_idx='$input_data_idx' and ".
			"      rsrcidx!='$rsrcidx'");
	goto bad
	    if (! $query_result);

	DBQueryWarn("delete from experiment_inputs ".
		    "where input_data_idx='$input_data_idx'")
	    or goto bad;

	if (defined($nsidx) && $nsidx == $input_data_idx) {
	    DBQueryWarn("update experiment_resources set input_data_idx=NULL ".
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			"where idx='$rsrcidx'")
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		or goto bad;
	}
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	next
	    if ($query_result->numrows);

	DBQueryWarn("delete from experiment_input_data ".
		    "where idx='$input_data_idx'")
	    or goto bad;
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    }
  done:
    DBQueryWarn("unlock tables");
    return 0;

  bad:
    DBQueryWarn("unlock tables");
    return 1;
}

#
# Grab an input file.
#
sub GetInputFile($$$)
{
    my ($self, $idx, $pref) = @_;

    # Must be a real reference. 
    return -1
	if (! ref($self));

    my $query_result =
	DBQueryWarn("select input from experiment_input_data ".
		    "where idx='$idx'");
    return -1
	if (! $query_result || !$query_result->numrows);

    my ($nsfile) = $query_result->fetchrow_array();
    $$pref = $nsfile;
    return 0;
}

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#
# Get the virt experiment object;
#
sub GetVirtExperiment($)
{
    my ($self) = @_;

    return undef
	if (! ref($self));

    return $self->{'VIRTEXPT'}
        if (defined($self->{'VIRTEXPT'}));

    require VirtExperiment;

    my $virtexperiment = VirtExperiment->Lookup($self);
    if (!defined($virtexperiment)) {
	print STDERR "*** Could not get virtual experiment object for $self\n";
	return undef;
    }
    $self->{'VIRTEXPT'} = $virtexperiment;
    return $virtexperiment;
}

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#
# Refresh a class instance by reloading from the DB.
#
sub Refresh($)
{
    my ($self) = @_;

    return -1
	if (! ref($self));

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    my $idx = $self->idx();
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    my $query_result =
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	DBQueryWarn("select * from experiments where idx=$idx");
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    return -1
	if (!$query_result || !$query_result->numrows);

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    $self->{'EXPT'}       = $query_result->fetchrow_hashref();
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    $self->{'VIRTEXPT'}   = undef;
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    $self->{'ISINSTANCE'} = undef;
    $self->{'ISTEMPLATE'} = undef;
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    $query_result =
	DBQueryWarn("select * from experiment_stats where exptidx='$idx'");
	
    return -1
	if (!$query_result || !$query_result->numrows);
    
    $self->{'STATS'} = $query_result->fetchrow_hashref();

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    my $rsrcidx = $self->rsrcidx();

    $query_result =
	DBQueryWarn("select * from experiment_resources ".
		    "where idx='$rsrcidx'");
	
    return -1
	if (!$query_result || !$query_result->numrows);
    
    $self->{'RSRC'} = $query_result->fetchrow_hashref();
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    return 0;
}

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#
# Perform some updates ...
#
sub Update($$)
{
    my ($self, $argref) = @_;

    # Must be a real reference. 
    return -1
	if (! ref($self));

    my $pid = $self->pid();
    my $eid = $self->eid();

    my $query = "update experiments set ".
	join(",", map("$_='" . $argref->{$_} . "'", keys(%{$argref})));

    $query .= " where pid='$pid' and eid='$eid'";

    return -1
	if (! DBQueryWarn($query));

    return Refresh($self);
}

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#
# Worker class method to change experiment info.
# Assumes most argument checking was done elsewhere.
#
sub EditExp($$$$$$)
{
    my ($class, $experiment, $user, $doemail, $argref, $usrerr_ref) = @_;

    my %mods;
    my $noreport;
    my %updates;

    #
    # Converting the batchmode is tricky, but we can let the DB take care
    # of it by requiring that the experiment not be locked, and it be in
    # the swapped state. If the query fails, we know that the experiment
    # was in transition.
    #
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    if (exists($argref->{"batchmode"}) && $experiment->batchmode() != $argref->{"batchmode"}) {
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	my $success  = 0;

	my $batchmode;
	if ($argref->{"batchmode"} ne "1") {
	    $batchmode = 0;
	    $argref->{"batchmode"} = 0;
	}
	else {
	    $batchmode = 1;
	    $argref->{"batchmode"} = 1;
	}

	if ($experiment->SetBatchMode($batchmode) != 0) {
	    $$usrerr_ref = "Batch Mode: Experiment is running or in transition; ".
		"try again later";
	    return undef;
	}
	$mods{"batchmode"} = $batchmode;
    }

    #
    # Now update the rest of the information in the DB.
    #

    # Name change for experiment description.
    if (exists($argref->{"description"})) {
	$updates{"expt_name"} = ($mods{"description"} = $argref->{"description"});
    }

    # Note that timeouts are in hours in the UI, but in minutes in the DB. 
    if (exists($argref->{"idleswap_timeout"})) {
	$updates{"idleswap_timeout"} = 60 * 
	    ($mods{"idleswap_timeout"} = $argref->{"idleswap_timeout"});
    }
    if (exists($argref->{"autoswap_timeout"})) {
	$updates{"autoswap_timeout"} = 60 * 
	    ($mods{"autoswap_timeout"} = $argref->{"autoswap_timeout"});
    }

    foreach my $col ("idle_ignore", "swappable", "noswap_reason",
		     "idleswap", "noidleswap_reason", "autoswap", "savedisk",
		     "cpu_usage", "mem_usage", "linktest_level") {
	# Copy args we want so that others can't get through.
	if (exists($argref->{$col})) {
	    $updates{$col} = $mods{$col} = $argref->{$col};
	}
    }

    # Save state before change for the email message below.
    my $olds = ($experiment->swappable() ? "Yes" : "No");
    my $oldsr= $experiment->noswap_reason();
    my $oldi = ($experiment->idleswap() ? "Yes" : "No");
    my $oldit= $experiment->idleswap_timeout() / 60.0;
    my $oldir= $experiment->noidleswap_reason();
    my $olda = ($experiment->autoswap() ? "Yes" : "No");
    my $oldat= $experiment->autoswap_timeout() / 60.0;

    if (keys %updates) {
	if ($experiment->Update(\%updates)) {
	    return undef;
	}
    }

    my $creator = $experiment->creator();
    my $swapper = $experiment->swapper();
    my $uid = $user->uid();
    my $pid = $experiment->pid();
    my $eid = $experiment->eid();

    if (!keys %mods) {
	if (!$noreport) {
	    # Warn the user that the submit button was pressed with no effect.
	    $$usrerr_ref = "Submit: Nothing changed";
	    return undef;
	}
    }
    # Do not send this email if the user is an administrator
    # (adminmode does not matter), and is changing an expt he created
    # or swapped in. Pointless email.
    elsif ( $doemail &&
	     ! ($user->admin() &&
		($uid eq $creator || $uid eq $swapper)) ) {

	# Send an audit e-mail reporting what is being changed.
	my $target_creator = $experiment->GetCreator();
	my $target_swapper = $experiment->GetSwapper();

	my $user_name  = $user->name();
	my $user_email = $user->email();
	my $cname      = $target_creator->name();
	my $cemail     = $target_creator->email();
	my $sname      = $target_swapper->name();
	my $semail     = $target_swapper->email();

	my $s    = ($experiment->swappable() ? "Yes" : "No");
	my $sr   = $experiment->noswap_reason();
	my $i    = ($experiment->idleswap() ? "Yes" : "No");
	my $it   = $experiment->idleswap_timeout() / 60.0;
	my $ir   = $experiment->noidleswap_reason();
	my $a    = ($experiment->autoswap() ? "Yes" : "No");
	my $at   = $experiment->autoswap_timeout() / 60.0;

	my $msg = "\n".
	    "The swap settings for $pid/$eid have changed\n".
	    "\nThe old settings were:\n".
	    "Swappable:\t$olds\t($oldsr)\n".
	    "Idleswap:\t$oldi\t(after $oldit hrs)\t($oldir)\n".
	    "MaxDuration:\t$olda\t(after $oldat hrs)\n".
	    "\nThe new settings are:\n".
	    "Swappable:\t$s\t($sr)\n".
	    "Idleswap:\t$i\t(after $it hrs)\t($ir)\n".
	    "MaxDuration:\t$a\t(after $at hrs)\n".
	    "\nCreator:\t$creator ($cname <$cemail>)\n".
	    "Swapper:\t$swapper ($sname <$semail>)\n".
            "\nDifferences were:\n";
	my @report = 
	    ("Description:description", "Idle Ignore:idle_ignore",
	     "Swappable:swappable", "Noswap Reason:noswap_reason",
	     "Idleswap:idleswap", "Idleswap Timeout:idleswap_timeout",
	     "Noidleswap Reason:noidleswap_reason", "Autoswap:autoswap",
	     "Autoswap timeout:autoswap_timeout", "Savedisk:savedisk",
	     "Cpu Usage:cpu_usage", "Mem Usage:mem_usage",
	     "Batch Mode:batchmode", "Linktest Level:linktest_level");
	foreach my $line (@report) {
	    my ($label, $field) = split /:/, $line;
	    if (exists($mods{$field})) {
		$msg .= sprintf "%-20s%s\n", $label .":", $mods{$field};
	    }
	}
	$msg .= "\n".
	   "\nIf it is necessary to change these settings, ".
	   "please reply to this message \nto notify the user, ".
	   "then change the settings here:\n\n".
	   "$TBBASE/showexp.php3?pid=$pid&eid=$eid\n\n".
	   "Thanks,\nTestbed WWW\n";

	SENDMAIL("$user_name <$user_email>",
		 "$pid/$eid swap settings changed",
		 $msg, TBMAIL_OPS(), sprintf("Bcc: %s\nErrors-To:%s", 
					     TBMAIL_AUDIT(), TBMAIL_WWW()));
    }
    return 1;
}

sub SetBatchMode($$) {
    my ($self, $mode) = @_;

    my $reqstate = EXPTSTATE_SWAPPED();
    my $idx      = $self->idx();
    $mode        = ($mode ? 1 : 0);

    DBQueryFatal("lock tables experiments write");

    my $query_result =
	DBQueryFatal("update experiments set ".
		     "   batchmode=$mode ".
		     "where idx='$idx' and ".
		     "     expt_locked is NULL and state='$reqstate'");

    my $success = $query_result->numrows;    # XXX Was DBAffectedRows().
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    DBQueryFatal("unlock tables");
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    return ($success ? 0 : -1);
}

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#
# Stringify for output.
#
sub Stringify($)
{
    my ($self) = @_;
    
    my $pid   = $self->pid();
    my $eid   = $self->eid();

    return "[Experiment: $pid/$eid]";
}

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#
# Generic function to look up some table values given a set of desired
# fields and some conditions. Pretty simple, not widely useful, but it
# helps to avoid spreading queries around then we need to. 
#
sub TableLookUp($$$;$)
{
    my ($self, $table, $fields, $conditions) = @_;

    # Must be a real reference. 
    return -1
	if (! ref($self));
    
    my $exptidx = $self->idx();

    if (defined($conditions) && "$conditions" ne "") {
	$conditions = "and ($conditions)";
    }
    else {
	$conditions = "";
    }

    return DBQueryWarn("select distinct $fields from $table ".
		       "where exptidx='$exptidx' $conditions");
}

#
# Ditto for update.
#
sub TableUpdate($$$;$)
{
    my ($self, $table, $sets, $conditions) = @_;

    # Must be a real reference. 
    return -1
	if (! ref($self));

    if (ref($sets) eq "HASH") {
	$sets = join(",", map("$_='" . $sets->{$_} . "'", keys(%{$sets})));
    }
    my $exptidx = $self->idx();

    if (defined($conditions) && "$conditions" ne "") {
	$conditions = "and ($conditions)";
    }
    else {
	$conditions = "";
    }

    return 0
	if (DBQueryWarn("update $table set $sets ".
			"where exptidx='$exptidx' $conditions"));
    return -1;
}

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#
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# Check permissions. Allow for either uid or a user ref until all code
# updated.
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#
sub AccessCheck($$$)
{
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    my ($self, $user, $access_type) = @_;
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    # Must be a real reference. 
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    return 0
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	if (! ref($self));

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    if ($access_type < TB_EXPT_MIN ||
	$access_type > TB_EXPT_MAX) {
	die("*** Invalid access type: $access_type!");
    }

    # Admins do whatever they want.
    return 1
	if ($user->IsAdmin());

    my $group = $self->GetGroup();
    return 0
	if (!defined($group));
    my $project = $self->GetProject();
    return 0
	if (!defined($project));

    #
    # An experiment may be destroyed by the experiment creator or the
    # project/group leader.
    #
    my $mintrust;
    
    if ($access_type == TB_EXPT_READINFO) {
	$mintrust = PROJMEMBERTRUST_USER;
    }
    else {
	$mintrust = PROJMEMBERTRUST_LOCALROOT;
    }
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    #
    # Either proper permission in the group, or group_root in the project.
    # This lets group_roots muck with other people's experiments, including
    # those in groups they do not belong to.
    #
    return TBMinTrust($group->Trust($user), $mintrust) ||
	TBMinTrust($project->Trust($user), PROJMEMBERTRUST_GROUPROOT);
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}

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#
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# Create the directory structure. A template_mode experiment is the one
# that is created for the template wrapper, not one created for an
# instance of the experiment. The path changes slightly, although that
# happens down in the mkexpdir script.
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#
sub CreateDirectory($)
{
    my ($self) = @_;

    # Must be a real reference. 
    return -1
	if (! ref($self));

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    my $idx = $self->idx();
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    mysystem("$MKEXPDIR $idx");
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    return -1
	if ($?);
    # mkexpdir sets the path in the DB. 
    return Refresh($self)
}

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#
# Load the project object for an experiment.
#
sub GetProject($)
{
    my ($self) = @_;

    # Must be a real reference. 
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    return undef
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	if (! ref($self));

    my $project = Project->Lookup($self->pid_idx());
    
    if (! defined($project)) {
	print("*** WARNING: Could not lookup project object for $self!", 1);
	return undef;
    }
    return $project;
}

#
# Load the group object for an experiment.
#
sub GetGroup($)
{
    my ($self) = @_;

    # Must be a real reference. 
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    return undef
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	if (! ref($self));

    my $group = Group->Lookup($self->gid_idx());
    
    if (! defined($group)) {
	print("*** WARNING: Could not lookup group object for $self!\n");
	return undef;
    }
    return $group;
}

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#
# Return the user and work directories. The workdir in on boss and where
# scripts chdir to when they run. The userdir is across NFS on ops, and
# where files are copied to. 
#
sub WorkDir($)
{
    my ($self) = @_;

    # Must be a real reference. 
    return -1
	if (! ref($self));

    my $pid = $self->pid();
    my $eid = $self->eid();

    return TBDB_EXPT_WORKDIR() . "/${pid}/${eid}";
}
sub UserDir($)
{
    my ($self) = @_;

    # Must be a real reference. 
    return -1
	if (! ref($self));

    return $self->path();
}
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# Long term storage.
sub InfoDir($$)
{
    my ($self) = @_;

    # Must be a real reference. 
    return -1
	if (! ref($self));

    my $pid = $self->pid();
    my $eid = $self->eid();
    my $idx = $self->idx();

    return "$TB/expinfo/$pid/$eid/$idx";
}
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# Event/Web key filenames.
sub EventKeyPath($)
{
    my ($self) = @_;

    # Must be a real reference. 
    return -1
	if (! ref($self));

    return UserDir($self) . "/tbdata/eventkey"; 
}
sub WebKeyPath($)
{
    my ($self) = @_;

    # Must be a real reference. 
    return -1
	if (! ref($self));

    return UserDir($self) . "/tbdata/webkey"; 
}

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#
# Add an environment variable.
#
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sub AddEnvVariable($$$;$)
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{
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    my ($self, $name, $value, $index) = @_;
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    # Must be a real reference. 
    return -1
	if (! ref($self));

    my $pid = $self->pid();
    my $eid = $self->eid();
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    my $exptidx = $self->idx();
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    if (defined($value)) {
	$value = DBQuoteSpecial($value);
    }
    else {
	$value = "''";
    }

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    #
    # Look to see if the variable exists, since a replace will actually
    # create a new row cause there is an auto_increment in the table that
    # is used to maintain order of the variables as specified in the NS file.
    #
    my $query_result =
	DBQueryWarn("select idx from virt_user_environment ".
		    "where name='$name' and pid='$pid' and eid='$eid'");

    return -1
	if (!$query_result);

    if ($query_result->numrows) {
	my $idx = (defined($index) ? $index :
		   ($query_result->fetchrow_array())[0]);
	    
	DBQueryWarn("replace into virt_user_environment set ".
		    "   name='$name', value=$value, idx=$idx, ".
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		    "   exptidx='$exptidx', pid='$pid', eid='$eid'")
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	    or return -1;
    }
    else {
	DBQueryWarn("insert into virt_user_environment set ".
		    "   name='$name', value=$value, idx=NULL, ".
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	    or return -1;
    }
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    return 0;
}

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#
# Write the environment strings into a little script in the user directory.
#
sub WriteEnvVariables($)
{
    my ($self) = @_;

    # Must be a real reference. 
    return -1
	if (! ref($self));

    my $pid = $self->pid();
    my $eid = $self->eid();

    my $query_result =
	DBQueryWarn("select name,value from virt_user_environment ".
		    "where  pid='$pid' and eid='$eid' order by idx");
    return -1
	if (!defined($query_result));

    my $userdir = $self->UserDir();
    my $envfile = "$userdir/tbdata/environment";

    if (!open(FP, "> $envfile")) {
	print "Could not open $envfile for writing: $!\n";
	return -1;
    }
    while (my ($name,$value) = $query_result->fetchrow_array()) {
	print FP "${name}=\"$value\"\n";
    }
    if (! close(FP)) {
	print "Could not close $envfile: $!\n";
	return -1;
    }
    
    return 0;
}

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#
# Experiment locking and state changes.
#
sub Unlock($;$)
{
    my ($self, $newstate) = @_;

    # Must be a real reference. 
    return -1
	if (! ref($self));

    my $pid = $self->pid();
    my $eid = $self->eid();
    my $sclause = (defined($newstate) ? ",state='$newstate' " : "");

    my $query_result =
	DBQueryWarn("update experiments set expt_locked=NULL $sclause ".
		    "where eid='$eid' and pid='$pid'");

    if (! $query_result ||
	$query_result->numrows == 0) {
	return -1;
    }
    
    if (defined($newstate)) {
	$self->{'EXPT'}->{'state'} = $newstate;

	if ($EVENTSYS) {
	    EventSendWarn(objtype   => libdb::TBDB_TBEVENT_EXPTSTATE(),
			  objname   => "$pid/$eid",
			  eventtype => $newstate,
			  expt      => "$pid/$eid",
			  host      => $BOSSNODE);
	}
    }
    
    return 0;
}

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sub Lock(;$$)
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{
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    my ($self, $newstate, $unlocktables) = @_;
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    # Must be a real reference. 
    return -1
	if (! ref($self));

    my $pid = $self->pid();
    my $eid = $self->eid();
    my $sclause = (defined($newstate) ? ",state='$newstate' " : "");

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    # flag to indicate tables should be unlocked. 
    $unlocktables = 0
	if (!defined($unlocktables));

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    my $query_result =
	DBQueryWarn("update experiments set expt_locked=now() $sclause ".
		    "where eid='$eid' and pid='$pid'");

    if (! $query_result ||
	$query_result->numrows == 0) {
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	$self->UnLockTables()
	    if ($unlocktables);
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	return -1;
    }
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    #
    # We do this before calling out to the event system to avoid livelock
    # in case the event system goes down.
    #
    $self->UnLockTables()
	if ($unlocktables);
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    if (defined($newstate)) {
	$self->{'EXPT'}->{'state'} = $newstate;

	if ($EVENTSYS) {
	    EventSendWarn(objtype   => libdb::TBDB_TBEVENT_EXPTSTATE(),
			  objname   => "$pid/$eid",
			  eventtype => $newstate,
			  expt      => "$pid/$eid",
			  host      => $BOSSNODE);
	}
    }
    return 0;
}

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sub SetState($$)
{
    my ($self, $newstate) = @_;

    # Must be a real reference. 
    return -1
	if (! ref($self));

    my $pid = $self->pid();
    my $eid = $self->eid();

    my $query_result =
	DBQueryWarn("update experiments set state='$newstate' ".
		    "where eid='$eid' and pid='$pid'");

    if (! $query_result ||
	$query_result->numrows == 0) {
	return -1;
    }
    
    if (defined($newstate)) {
	$self->{'EXPT'}->{'state'} = $newstate;

	if ($EVENTSYS) {
	    EventSendWarn(objtype   => libdb::TBDB_TBEVENT_EXPTSTATE(),
			  objname   => "$pid/$eid",
			  eventtype => $newstate,
			  expt      => "$pid/$eid",
			  host      => $BOSSNODE);
	}
    }
    
    return 0;
}

#
# Logfiles. This all needs to change.
#
# Open a new logfile and return its name.
#
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sub CreateLogFile($$)
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{
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    # Must be a real reference. 
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    return undef
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	if (! ref($self));

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    my $pid      = $self->pid();
    my $eid      = $self->eid();
    my $gid_idx  = $self->gid_idx();
    my $logdir   = $self->WorkDir();
    my $linkname = "$logdir/${prefix}.log";
    my $logname  = `mktemp $logdir/${prefix}.XXXXXX`;
    return undef
	if ($?);
    
    # Untaint to avoid silly warnings
    if ($logname =~ /^([-\w\.\/]+)$/) {
	$logname = $1;
    }
    else {
	print STDERR "Bad data in filename: $logname\n";
	return undef;
    }
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    # Create a Logfile.
    my $logfile = Logfile->Create($gid_idx, $logname);
    if (!defined($logfile)) {
	unlink($logname);
	return undef;
    }
    # This is untainted.
    $logname = $logfile->filename();

    # So tbops people can read the files ...
    if (!chmod(0664, $logname)) {
	print STDERR "Could not chmod $logname to 0644: $!\n";
	$logfile->Delete();
	unlink($logname);
	return undef;
    }

    # Link it to $prefix.log so that the most recent is well known.
    if (-e $linkname) {
	unlink($linkname);
    }
    if (! link($logname, $linkname)) {
	print STDERR "CreateLogFile: Cannot link $logname,$linkname: $!\n";
	$logfile->Delete();
	unlink($logname);
	return undef;
    }
    return $logfile;
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}

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#
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# Set the experiments NS file using AddInputFile() above
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#
sub SetNSFile($$)
{
    my ($self, $nsfile) = @_;

    # Must be a real reference. 
    return -1
	if (! ref($self));

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    return $self->AddInputFile($nsfile, 1);
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sub GetNSFile($$)
{
    my ($self, $pref) = @_;
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    # Must be a real reference. 
    return -1
	if (! ref($self));
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    # In case there is no NS file stored.
    $$pref = undef;

    my $input_data_idx = $self->input_data_idx();
    return 0
	if (!defined($input_data_idx));

    return $self->GetInputFile($input_data_idx, $pref);
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}

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#
# Set the experiment to use the logfile. It becomes the "current" spew.
#
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sub SetLogFile($$;$)
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