swapexp.in 15.5 KB
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#!/usr/bin/perl -wT
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#
# EMULAB-COPYRIGHT
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# Copyright (c) 2000-2003 University of Utah and the Flux Group.
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# All rights reserved.
#

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use English;
use Getopt::Std;

#
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# This gets invoked from the Web interface.
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# Swap an experiment in, swap it out, restart or modify.
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#
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sub usage()
{
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    print STDOUT "Usage: swapexp [-b] [-i] [-r] ".
	"<-s in | out | restart | modify> <pid> <eid> [<nsfile>]\n";
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    exit(-1);
}
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my  $optlist = "s:irb";
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#
# Configure variables
#
my $TB     = "@prefix@";
my $TBOPS  = "@TBOPSEMAIL@";
my $TBLOGS = "@TBLOGSEMAIL@";
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my $TBINFO = "$TB/expinfo";
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#
# Testbed Support libraries
#
use lib "@prefix@/lib";
use libdb;
use libtestbed;

my $tbdir    = "$TB/bin/";
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my $tbdata   = "tbdata";
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my $batch    = 0;
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my $idleswap = 0;
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my $reboot   = 0;
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my $errorstat= -1;
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my $inout;
my $logname;
my $dbuid;
my $user_name;
my $user_email;
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my @allnodes;
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my @row;
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my $action;
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#
# Untaint the path
# 
$ENV{'PATH'} = '/bin:/usr/bin';
delete @ENV{'IFS', 'CDPATH', 'ENV', 'BASH_ENV'};

#
# Turn off line buffering on output
#
$| = 1;

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#
# Set umask for start/swap. We want other members in the project to be
# able to swap/end experiments, so the log and intermediate files need
# to be 664 since some are opened for append.
#
umask(0002);

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#
# Parse command arguments. Once we return from getopts, all that should
# left are the required arguments.
#
%options = ();
if (! getopts($optlist, \%options)) {
    usage();
}
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if (defined($options{"i"})) {
    $idleswap = 1;
}
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if (defined($options{"b"})) {
    $batch = 1;
}
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if (defined($options{"r"})) {
    $reboot = 1;
}
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if (defined($options{"s"})) {
    $inout = $options{"s"};

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    if ($inout ne "out"     &&
	$inout ne "in"      &&
	$inout ne "restart" &&
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	$inout ne "modify") {
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	usage();
    }
}
else {
    usage();
}

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if (@ARGV != (($inout eq "modify") ? 3 : 2)) {
    usage();
}
my $pid   = $ARGV[0];
my $eid   = $ARGV[1];

my $nsfile;

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if ($inout eq "modify") {
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    $nsfile = $ARGV[2];

    #
    # Untaint nsfile argument; Allow slash.
    #
    if ($nsfile =~ /^([-\w.\/]+)$/) {
	$nsfile = $1;
    } else {
	die("Tainted nsfile name: $nsfile");
    }
}

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#
# Untaint the arguments.
#
if ($pid =~ /^([-\@\w.]+)$/) {
    $pid = $1;
}
else {
    die("Tainted argument $pid!\n");
}
if ($eid =~ /^([-\@\w.]+)$/) {
    $eid = $1;
}
else {
    die("Tainted argument $eid!\n");
}
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my $repfile = "$eid.report";
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my $workdir = TBExptWorkDir($pid, $eid);
my $userdir = TBExptUserDir($pid, $eid);
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#
# Verify user and get his DB uid.
#
if (! UNIX2DBUID($UID, \$dbuid)) {
    die("*** $0:\n".
	"    You do not exist in the Emulab Database.\n");
}

#
# Get email info for user.
#
if (! UserDBInfo($dbuid, \$user_name, \$user_email)) {
    die("*** $0:\n".
	"    Cannot determine your name and email address.\n");
}

#
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# Verify that this person can muck with the experiment.
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# Note that any script down the line has to do an admin check also. 
#
if ($UID && !TBAdmin($UID) &&
    !TBExptAccessCheck($dbuid, $pid, $eid, TB_EXPT_DESTROY)) {
    die("*** $0:\n".
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	"    You do not have permission to swap or modify this experiment!\n");
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}

#
# We have to protect against trying to end an experiment that is currently
# in the process of being terminated. We use a "wrapper" state (actually
# a timestamp so we can say when termination was requested) since
# terminating consists of a couple of different experiment states down inside
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# the tb scripts.
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#
DBQueryFatal("lock tables experiments write");

$query_result =
    DBQueryFatal("SELECT * FROM experiments WHERE eid='$eid' and pid='$pid'");

if (! $query_result->numrows) {
    die("*** $0:\n".
	"    No such experiment $pid/$eid exists!\n");
}
my %hashrow = $query_result->fetchhash();
my $expt_head_login = $hashrow{'expt_head_uid'};
my $estate          = $hashrow{'state'};
my $expt_path       = $hashrow{'path'};
my $isbatchexpt     = $hashrow{'batchmode'};
my $ebatchstate     = $hashrow{'batchstate'};

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if (! chdir($workdir)) {
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    die("*** $0:\n".
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	"    Could not chdir to $workdir: $!\n");
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}

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if (defined($hashrow{'expt_locked'})) {
    $val = $hashrow{'expt_locked'};
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    die("*** $0:\n".
	"    It appears that $pid/$eid went into transition at $val.\n".
	"    You will be notified via email when experiment transition ".
	"    is complete.\n");
}

#
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# Batchmode.
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#
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if ($isbatchexpt) {
    #
    # When coming from the daemon, sanity check the batch state.
    #
    if ($batch) {
	if ($inout eq "in") {
	    die("*** $0:\n".
		"    Batch experiment $pid/$eid is not in the proper state!\n".
		"    Currently $ebatchstate, but should be ACTIVATING\n")
		if ($ebatchstate ne BATCHSTATE_ACTIVATING);
	}
	elsif ($inout eq "out") {
	    die("*** $0:\n".
		"    Batch experiment $pid/$eid is not in the proper state!\n".
		"    Currently $ebatchstate, but should be TERMINATING\n")
		if ($ebatchstate ne BATCHSTATE_TERMINATING);
	}
	else {
	    die("*** $0:\n".
		"    Improper request from batch daemon for $pid/$eid!\n");
	}
    }
    else {
	#
	# User is requesting that a batch either be injected or paused.
	# Sanity check the state, but otherwise let the batch daemon
	# handle it.
	# 
	if ($inout eq "in") {
	    die("*** $0:\n".
		"    Batch experiment $pid/$eid is not in the proper state!\n".
		"    Currently $ebatchstate. Must be PAUSED to swap in.\n")
		if ($ebatchstate ne BATCHSTATE_PAUSED);
	    TBSetBatchState($pid, $eid, BATCHSTATE_POSTED);
	}
	elsif ($inout eq "out") {
	    die("*** $0:\n".
		"    Batch experiment $pid/$eid is not in the proper state!\n".
		"    Currently $ebatchstate. Must be RUNNING to swap out.\n")
		if ($ebatchstate ne BATCHSTATE_RUNNING);

	    my $flag = BATCHMODE_CANCELSWAP;
	
	    DBQueryFatal("UPDATE experiments set canceled=$flag ".
			 "WHERE eid='$eid' and pid='$pid'");
	}
	else {
	    die("*** $0:\n",
		"    Batch experiments can only be swapped in or out!\n");
	}
	exit(0);
    }
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}

#
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# Okay, check state. We do not allow modification or swapping to start when the
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# experiment is in transition. A future task would be to allow this,
# but for now the experiment must be in one of a few states to proceed
#
# Seems like too many states!
#
if ($estate ne EXPTSTATE_ACTIVE && $estate ne EXPTSTATE_SWAPPED) {
    die("*** $0:\n".
	"    It appears that experiment $pid/$eid is in transition.\n".
	"    The user that created the experiment will be notified via\n".
        "    email when the experiment is no longer in transition.\n");
}

if ($inout eq "in" && $estate eq EXPTSTATE_ACTIVE) {
    die("*** $0:\n".
	"    It appears that experiment $pid/$eid is already swapped in!");
}
if ($inout eq "out" && $estate eq EXPTSTATE_SWAPPED) {
    die("*** $0:\n".
	"    It appears that experiment $pid/$eid is already swapped out!");
}
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if ($inout eq "restart" && $estate ne EXPTSTATE_ACTIVE) {
    die("*** $0:\n".
	"    It appears that experiment $pid/$eid is not active!");
}
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# if $inout eq "modify", either EXPTSTATE_ACTIVE -or- EXPTSTATE_SWAPPED is ok.

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#
# Set the timestamp now, and unlock the experiments table.
#
DBQueryFatal("UPDATE experiments SET expt_locked=now() ".
	     "WHERE eid='$eid' and pid='$pid'");

DBQueryFatal("unlock tables");

#
# XXX - At this point a failure is going to leave things in an
# inconsistent state.
#

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if ($inout eq "in") {
    $action = "swapped in";
}
if ($inout eq "out") {
    $action = "swapped out";
}
if ($inout eq "restart") {
    $action = "restarted";
}
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if ($inout eq "modify") {
    $action = "modified";
}
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#
# Get email address of the experiment head, which may be different than
# the person who is actually terminating the experiment, since its polite
# to let the original creator know whats going on. 
#
my $expt_head_name;
my $expt_head_email;

if (! UserDBInfo($expt_head_login, \$expt_head_name, \$expt_head_email)) {
    print STDERR "*** WARNING: ".
	         "Could not determine name/email for $expt_head_login.\n";
    $expt_head_name  = "TBOPS";
    $expt_head_email = $TBOPS;
}

#
# If not in batch mode, go into the background. Parent exits.
#
if (! $batch) {
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    $logname = TBExptCreateLogFile($pid, $eid, "swapexp");
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    TBExptSetLogFile($pid, $eid, $logname);
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    TBExptOpenLogFile($pid, $eid);
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    if (TBBackGround($logname)) {
	#
	# Parent exits normally
	#
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	print "Experiment $pid/$eid is now being $action.\n".
	    "You will be notified via email when the this is done.\n";
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	exit(0);
    }
}

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#
# Remove old report file since its contents are going to be invalid.
#
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if ($inout ne "restart" && -e $repfile) {
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    unlink("$repfile");
}

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#
# Sanity check states in case someone changes something.
#
if ($inout eq "out") {
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    print STDOUT "Running 'tbswap out' with arguments: $pid $eid\n";
    if (system("$tbdir/tbswap out $pid $eid") != 0) {
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	$errorstat = $? >> 8;
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	fatal("tbswap out failed!\n");
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    }
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    $estate = ExpState($pid,$eid);
    if ($estate ne EXPTSTATE_SWAPPED) {
	fatal("Experiment is in the wrong state: $estate\n");
    }
}
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elsif ($inout eq "in") {
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    print STDOUT "Running 'tbswap in' with arguments: $pid $eid\n";
    if (system("$tbdir/tbswap in $pid $eid") != 0) {
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	$errorstat = $? >> 8;
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	fatal("tbswap in failed!\n");
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    }
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    $estate = ExpState($pid,$eid);
    if ($estate ne EXPTSTATE_ACTIVE) {
	fatal("Experiment is in the wrong state: $estate\n");
    }
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    system("$tbdir/tbreport -b $pid $eid 2>&1 > $repfile");
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}
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elsif ($inout eq "modify") {
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    my $modifyError = "";

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    GatherSwapStats($pid, $eid, $dbuid,
		    TBDB_STATS_SWAPMODIFY, 0, TBDB_STATS_FLAGS_PREMODIFY);

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    print "Backing up old experiment state ... " . TBTimeStamp() . "\n";
    if (TBExptBackupVirtualState($pid, $eid, $$)) {
	fatal("*** $0:\n".
	      "    Could not backup experiment state; cannot safely continue!\n");
    }
    TBExptRemoveVirtualState($pid, $eid);

    #
    # Rerun tbprerun if modifying.
    #
    if (system("$tbdir/tbprerun -m $pid $eid $nsfile") != 0) {
	$modifyError = "tbprerun failed!";
    }

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    #
    # If experiment is currently swapped out, no need to do an update 
    # after modifying it.
    #
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    if (! $modifyError && $estate eq EXPTSTATE_ACTIVE) {
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	print STDOUT "Running 'tbswap update' with arguments: $pid $eid\n";
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	my $rebootSwitch = "";
	if ($reboot) {
	    $rebootSwitch = "-reboot";
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	}

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	if (system("$tbdir/tbswap update $rebootSwitch $pid $eid") != 0) {
	    $errorstat = $? >> 8;
	    $modifyError = "tbswap update failed!";
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	}
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	if (! $modifyError) {
	    $estate = ExpState($pid, $eid);
	    if ($estate ne EXPTSTATE_ACTIVE) {
		fatal("Experiment is in the wrong state: $estate!");
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	    }
	}
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	if (! $modifyError) {
	    system("$tbdir/tbreport -b $pid $eid 2>&1 > $repfile");
	}
    }

    if ($modifyError) {
	print STDERR "*** $0:\n".
	             "    $modifyError\n";
	print STDOUT "Recovering experiment state...\n";
	TBExptRemoveVirtualState($pid, $eid );
	if (0 == TBExptRestoreVirtualState($pid, $eid, $$)) {
	    fatal("*** Update aborted; old state restored.\n");
	} else {
	    # Set state to NEW so experiment will get wiped.
	    SetExpState($pid, $eid, EXPTSTATE_NEW);
	    fatal("*** Experiment state could not be restored!\n");
	}
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    }
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}
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else { # $inout eq "restart" assumed.
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    print STDOUT "Running tbrestart with arguments: $pid $eid\n";
    if (system("$tbdir/tbrestart $pid $eid") != 0) {
	fatal("tbrestart failed!\n");
    }
}
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#
# Try to copy off the files for testbed information gathering.
#
TBSaveExpLogFiles($pid, $eid);

#
# Make a copy of the work dir in the user visible space so the user
# can see the log files. This overwrites existing files of course,
# but thats okay.
#
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system("cp -Rfp $workdir/ $userdir/tbdata/");
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#
# Gather stats. 
#
if ($inout eq "in") {
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    GatherSwapStats($pid, $eid, $dbuid, TBDB_STATS_SWAPIN, 0);
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}
elsif ($inout eq "out") {
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    GatherSwapStats($pid, $eid, $dbuid, TBDB_STATS_SWAPOUT, 0,
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		    ($idleswap ? TBDB_STATS_FLAGS_IDLESWAP() : 0));
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}
elsif ($inout eq "modify") {
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    GatherSwapStats($pid, $eid, $dbuid, TBDB_STATS_SWAPMODIFY, 0);
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}

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#
# Set the swapper uid on success only, and *after* gathering swap stats!
#
TBExptSetSwapUID($pid, $eid, $dbuid);

#
# Must unlock before exit.
#
TBUnLockExp($pid, $eid);

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print "Done!\n";
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#
# In batch mode, just exit without sending email.
#
if ($batch) {
    exit(0);
}

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#
# HACK! if successful, put new NS file in DB.
#

if ($inout eq "modify") {
    $nsdata_string = `cat $nsfile`;
    if (defined($nsdata_string)) {
	$nsdata_string = DBQuoteSpecial($nsdata_string);

	DBQueryWarn("delete from nsfiles WHERE eid='$eid' and pid='$pid'");
	DBQueryWarn("insert into nsfiles (pid, eid, nsfile) ".
		    "VALUES('$pid', '$eid', $nsdata_string)");
    } else {
	print "Warning!! Couldn't read nsfile '$nsfile'!\n";
    }
}

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#
# Clear the log file so the web page stops spewing. 
#
if (defined($logname)) {
    TBExptCloseLogFile($pid, $eid);
}

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#
# Send email notification to user.
#
my $message =
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    "Experiment $eid in project $pid has been ";

if ($idleswap) {
    $message .= "forcibly swapped out by\n".
	"Testbed Operations because it was idle for too long.\n";
}
else {
    $message .= "$action.\n";
}

$message .=
    "\n".
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    "Appended below is the output. If you have any questions or comments,\n" .
    "please include the output in your message to $TBOPS\n";
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SENDMAIL("$user_name <$user_email>",
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	 "Experiment $pid/$eid \u$action",
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	 $message,
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	 ($idleswap ? $TBOPS : "$user_name <$user_email>"),
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	 "Cc:  $expt_head_name <$expt_head_email>\n".
	 "Bcc: $TBLOGS",
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	 (($inout eq "restart") ? ($logname) : ($repfile, $logname)));
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exit 0;

sub fatal($)
{
    my($mesg) = $_[0];
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    print STDOUT $mesg;

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    #
    # Gather stats. 
    #
    if ($inout eq "in") {
	GatherSwapStats($pid, $eid, $dbuid, TBDB_STATS_SWAPIN, $errorstat);
    }
    elsif ($inout eq "out") {
	GatherSwapStats($pid, $eid, $dbuid, TBDB_STATS_SWAPOUT, $errorstat);
    }
    elsif ($inout eq "modify") {
	GatherSwapStats($pid, $eid, $dbuid, TBDB_STATS_SWAPMODIFY, $errorstat);
    }

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    #
    # if $hosed == 1, we entirely terminate the experiment.
    #
    my $hosed = 0;

    # If we're doing a modify,
    # and tbprerun sent the experiment to "NEW",
    # we're hosed.
    if ($inout eq "modify" && ExpState($pid,$eid) eq EXPTSTATE_NEW) {
	$hosed = 1;
    }

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    if ($hosed) {
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	#
	# Note: $estate is still set to the state which the experiment was in
	# when we began.
	#
	if ($estate eq EXPTSTATE_ACTIVE) {
	    print "Running 'tbswap out' with arguments: $pid $eid\n";
	    if (system("$tbdir/tbswap out -force $pid $eid") != 0) {
		print "tbswap out failed!\n";
	    }
	}
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	print "Running tbend with arguments: -force $pid $eid\n";
	if (system("$tbdir/tbend -force $pid $eid") != 0) {
	    print "tbend failed!\n";
	}
    }

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    #
    # Kill this for convenience later.
    # 
    DBQueryWarn("update experiments set expt_locked=NULL ".
		"WHERE eid='$eid' and pid='$pid'");

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    # Copy over the log files so the user can see them.
    system("/bin/cp -Rfp $workdir/ $userdir/tbdata");

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    #
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    # In batch mode, exit without sending the email.
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    #
    if ($batch) {
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	TBUnLockExp($pid, $eid);
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	exit($errorstat);
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    }

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    #
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    # Clear the log file so the web page stops spewing.
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    #
    if (defined($logname)) {
	TBExptCloseLogFile($pid, $eid);
    }

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    #
    # Send a message to the testbed list. Append the logfile.
    #
    SENDMAIL("$user_name <$user_email>",
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	     "Swap ${inout} Failure: $pid/$eid",
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	     $mesg,
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	     ($idleswap ? $TBOPS : "$user_name <$user_email>"),
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	     "Cc:  $expt_head_name <$expt_head_email>\n".
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	     "Cc:  $TBOPS",
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	     ($logname));

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    if ($hosed) {
	#
	# Copy off the workdir to the user directory, Then back up both of
	# them for post-mortem debugging.
	#
	system("/bin/cp -Rfp $workdir/ $userdir/tbdata");
	system("/bin/rm -rf  ${workdir}-failed");
	system("/bin/mv -f   $workdir ${workdir}-failed");
	system("/bin/rm -rf  ${userdir}-failed");
	system("/bin/mv -f   $userdir ${userdir}-failed");
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	TBExptDestroy($pid, $eid);
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    }

654
    exit($errorstat);
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}

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