libreboot.pm.in 23.9 KB
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#!/usr/bin/perl -wT
#
# EMULAB-COPYRIGHT
# Copyright (c) 2000-2004 University of Utah and the Flux Group.
# All rights reserved.
#
# node reboot library. Basically the backend to the node_reboot script, but
# also used where we need finer control of rebooting nodes (and failure).
#
# XXX Only suitable for scripts that are already setuid and have not
# dropped privs by the time they call into nodereboot(). I think this
# makes the library somewhat useless.
#
package libreboot;

use strict;
use Exporter;
use vars qw(@ISA @EXPORT);

@ISA    = "Exporter";
@EXPORT = qw ( nodereboot nodereboot_wait );

# Must come after package declaration!
use lib '@prefix@/lib';
use libdb;
use English;

#
# Configure variables
#
my $TB		= "@prefix@";
my $CLIENT_BIN  = "@CLIENT_BINDIR@";
my $BOSSNODE    = "@BOSSNODE@";

#
# The number of nodes we reboot at a time. Degree of parallelism ...
#
my $BATCHCOUNT  = 12;

#
# Testbed Support libraries
#
use lib "@prefix@/lib";
use libdb;
use libtestbed;
use event;
use POSIX qw(strftime);
use IO::Handle;
use Fcntl;

# External Programs
my $ssh		= "$TB/bin/sshtb -n";
my $power	= "$TB/bin/power";
my $ipod	= "$TB/sbin/apod";
my $vnodesetup	= "$TB/sbin/vnode_setup";
my $bisend      = "$TB/sbin/bootinfosend";
my $logfile	= "$TB/log/power.log";
my $ping	= "/sbin/ping";
my $reboot      = "$TB/bin/node_reboot";

# Locals
my $debug       = 0;
my %children    = ();

#
# The actual library function. 
#
sub nodereboot($$)
{
    my ($args, $result) = @_;

    $debug = $args->{'debug'}
        if (exists($args->{'debug'}));

    if ($EUID != 0) {
	#
	# Use the exec version, but only if we do not already have
	# a pipeno in the environment, which would indicate a loop
	# caused by installing improperly.
	#
	if (exists($ENV{'REBOOTPIPENO'})) {
	    print STDERR "*** reboot: Must be root when using library!\n";
	    return -1;
	}
	print STDERR "reboot: no privs; invoking real nodereboot script!\n"
	    if ($debug);
	return nodereboot_exec($args, $result);
    }

    if (!defined($args->{'nodelist'})) {
	print STDERR "*** reboot: Must supply a node list!\n";
	return -1;
    }
    my @nodes       = @{ $args->{'nodelist'}};
    my $powercycle  = 0;
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    my $rebootmode  = 0;
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    my $waitmode    = 0;
    my $realmode    = 1;
    my $killmode    = 0;
    my $freemode    = 0;
    my $reconfig    = 0;
    my $asyncmode   = 0;
    my $pipemode    = 0;

    $powercycle  = $args->{'powercycle'} if (exists($args->{'powercycle'}));
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    $rebootmode  = $args->{'rebootmode'} if (exists($args->{'rebootmode'}));
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    $waitmode    = $args->{'waitmode'}   if (exists($args->{'waitmode'}));
    $realmode    = $args->{'realmode'}   if (exists($args->{'realmode'}));
    $killmode    = $args->{'killmode'}   if (exists($args->{'killmode'}));
    $freemode    = $args->{'freemode'}   if (exists($args->{'freemode'}));
    $reconfig    = $args->{'reconfig'}   if (exists($args->{'reconfig'}));
    $asyncmode   = $args->{'asyncmode'}  if (exists($args->{'asyncmode'}));

    #
    # If pipeno is specified in the environment, we write the results to
    # that pipe.
    # 
    if (exists($ENV{'REBOOTPIPENO'})) {
	$pipemode = $ENV{'REBOOTPIPENO'};

	if ($pipemode =~ /^(\d+)$/) {
	    $pipemode = $1;
	}
	else {
	    print STDERR "*** reboot: Bad pipeno in environment: $pipemode!\n";
	    return -1;
	}
    }

    #
    # Verify permission to reboot these nodes.
    #
    if ($UID && !TBAdmin($UID) &&
	! TBNodeAccessCheck($UID, TB_NODEACCESS_REBOOT, @nodes)) {
	print STDERR "*** reboot: ".
	    "You do not have permission to reboot some of the nodes!\n";
	return -1;
    }

    # Locals.
    my %pids	 = ();
    my $failed   = 0;

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    # XXX - Wisconsin hack to avoid rebooting routers - this needs to be
    # replaced with the node_capabilities stuff or similar.
    my @temp = ();
    foreach my $node (@nodes) {
	my $qr = DBQueryFatal("select nt.isrebootable from " .
	    "nodes as n, node_types as nt " .
	    "where n.node_id=\"$node\" and " .
	    "n.type = nt.type");
	my ($rebootable) = $qr->fetchrow_array();
	push(@temp,$node) if $rebootable;
    }
    @nodes = @temp;
    # END XXX

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    #
    # VIRTNODE HACK: Virtual nodes are special. We can reboot jailed
    # vnodes, but not old style (non-jail). Also, if we are going to
    # reboot the physical node that a vnode is on, do not bother with
    # rebooting the vnode since it will certainly get rebooted anyway!
    #
    my %realnodes = ();
    my %virtnodes = ();

    foreach my $node (@nodes) {
	my ($jailed, $plab);

	# All nodes start out as being successful; altered later as needed.
	$result->{$node} = 0;

	if (TBIsNodeVirtual($node, \$jailed, \$plab)) {
	    if (! $jailed && ! $plab) {
		print "reboot ($node): Skipping old style virtual node\n";
		next;
	    }
	    my $pnode;

	    if (! TBPhysNodeID($node, \$pnode)) {
		print STDERR "*** reboot ($node): No physical node!\n";
		return -1;
	    }
	    $virtnodes{$node} = $pnode;
	}
	else {
	    $realnodes{$node} = $node;
	}
    }
    for my $node ( keys(%virtnodes) ) {
	my $pnode = $virtnodes{$node};

	if (defined($realnodes{$pnode})) {
	    print "reboot ($node): Dropping since its host $pnode will reboot\n";
	    delete($virtnodes{$node});
	}
    }
    if (! keys(%realnodes) && ! keys(%virtnodes)) {
	print "reboot: No nodes to reboot.\n";
	return 0;
    }
    my @sortednodes = sort(keys(%realnodes));

    #
    # This stuff is incomplete and non-functional.
    # 
    if (!$realmode) {
	EventSendFatal(host      => $BOSSNODE ,
		       objtype   => TBDB_TBEVENT_COMMAND ,
		       eventtype => TBDB_COMMAND_REBOOT ,
		       objname   => join(",", @sortednodes));
	# In here we can do some output to tell the user what's going on.
	if ($waitmode) {
	    # Wait for [SHUTDOWN,ISUP]
	}
	else {
	    # Wait for [SHUTDOWN]
	}
	return 0;
    }

    #
    # This is somewhat hackish. To promote parallelism, we want to fork off
    # the reboot from the parent so it can do other things.  The problem is
    # how to return status via the results vector. Well, lets do it with
    # some simple IPC. Since the results vector is simply a hash of node
    # name to an integer value, its easy to pass that back.
    #
    # We return the pid to the caller, which it can wait on either directly
    # or by calling back into this library if it wants to actually get the
    # results from the child!
    #
    if ($asyncmode) {
	#
	# Create a pipe to read back results from the child we will create.
	#
	if (! pipe(PARENT_READER, CHILD_WRITER)) {
	    print STDERR "*** reboot: creating pipe: $!\n";
	    return -1;
	}
	CHILD_WRITER->autoflush(1);

	if (my $childpid = fork()) {
	    close(CHILD_WRITER);
	    $children{$childpid} = [ *PARENT_READER, $result ];
	    return $childpid;
	}
	#
	# Child keeps going. 
	#
	close(PARENT_READER);
	TBdbfork();

	print STDERR "reboot: Running in asyncmode.\n"
	    if ($debug);
    }
    elsif ($pipemode) {
	#
	# We were invoked with an FD already opened to write the results to.
	# See nodereboot_exec() below. The operation from here is basically
	# the same as in asyncmode, but we do not need to create the pipe,
	# but rather just write the results to the pipe we got. 
	#
	if (! open(CHILD_WRITER, ">>&=${pipemode}")) {
	    print STDERR "*** reboot: reopening pipe: $!\n";
	    return -1;
	}
	CHILD_WRITER->autoflush(1);

	print STDERR "reboot: Running in pipemode ($pipemode).\n"
	    if ($debug);
    }

    #
    # We do not want 50 nodes all rebooting at the same time.  Lets order
    # them so that the shelves are grouped together at least, and issue the
    # reboots in batches.
    #
    while (@sortednodes) {
	my @batch     = ();
	my $i         = 0;
	my $lastshelf = 0;

	while ($i < $BATCHCOUNT && @sortednodes > 0) {
	    my $node = shift(@sortednodes);
	    my $shelf;
	    my $unit;

	    #
	    # The point of this sillyness is stop at each shark shelf transition.
	    # Whats a shark you ask?
	    #
	    if (IsShelved($node, \$shelf, \$unit)) {
		if ($lastshelf && $lastshelf ne $shelf) {
		    unshift(@sortednodes, $node);
		    last;
		}
		$lastshelf = $shelf;
	    }
	    push(@batch, $node);
	    $i++;
	}

	if ($powercycle) {
	    #
	    # In powercyle mode, call the power program for the whole
	    # batch, and continue on. We do not wait for them to go down or
	    # reboot.
	    #
	    info("*** reboot: Powercyle mode: power cycle ".join(" ",@batch));
	    if (PowerCycle(@batch)) {
		print STDERR
		    "*** reboot: Powercyle failed for " . join(" ",@batch) ."\n";
		foreach my $node (@batch) {
		    $result->{$node} = -1;
		    $failed++;
		}
	    }
	}
	else {
	    #
	    # Fire off a reboot process so that we can overlap them all.
	    # We need the pid so we can wait for them all before preceeding.
	    #
	    foreach my $node ( @batch ) {
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		$pids{$node} = RebootNode($node, $reconfig,
					  $killmode, $rebootmode);
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	    }
	}

	#
	# If there are more nodes to go, then lets pause a bit so that we
	# do not get a flood of machines coming up all at the same exact
	# moment.
	#
	if (@sortednodes) {
	    print "reboot: Pausing to give some nodes time to reboot\n"
		if ($debug);
	    
	    if ($lastshelf) {
		sleep(10);
	    }
	    else {
		sleep(5);
	    }
	}
    }

    #
    # Wait for all the reboot children to exit before continuing.
    #
    my @needPowercycle = ();
    if (scalar(keys(%pids))) {
	foreach my $node (sort(keys(%realnodes))) {
	    my $mypid     = $pids{$node};
	    my $status;

	    #
	    # Child may have avoided the fork, and returned status directly.
	    # Flip it and apply the same test.
	    #
	    if ($mypid <= 0) {
		$status = -$mypid;
	    }
	    else {
		waitpid($mypid, 0);
		$status = $? >> 8;
	    }

	    if ($status == 2) {
		# Child signaled to us that this node needs a power cycle
		push(@needPowercycle, $node);
	    }
	    elsif ($?) {
		$failed++;
		$result->{$node} = -1;
		print STDERR "*** reboot ($node): Failed!\n";
	    }
	    else {
		print STDOUT "reboot ($node): Successful!\n";
	    }
	}
    }

    #
    # Power cycle nodes that couldn't be brought down any other way
    #
    if (@needPowercycle) {
	if (PowerCycle(@needPowercycle)) {
	    print STDERR
		"*** reboot: Powercyle failed for " .
		    join(" ",@needPowercycle) ."\n";
	    foreach my $node (@needPowercycle) {
		$result->{$node} = -1;
		$failed++;
	    }
	}
    }

    #
    # Now do vnodes. Do these serially for now (simple).
    #
    for my $node ( sort(keys(%virtnodes)) ) {
	my $pnode = $virtnodes{$node};

	if (RebootVNode($node, $pnode)) {
	    $failed++;
	    $result->{$node} = -1;
	    print STDERR "*** reboot ($node): failed (on $pnode).\n";
	}
	else {
	    print STDOUT "reboot ($node): rebooting (on $pnode).\n";
	}
    }

    #
    # Wait for nodes to reboot. We wait only once, no reboots.
    #
    if ($waitmode) {
	my $waitstart = time;

	print STDOUT "reboot: Waiting for nodes to come up.\n";

	# Wait for events to filter through stated! If we do not wait, then we
	# could see nodes still in ISUP.
	sleep(2);

	foreach my $node (sort(@nodes)) {
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	    my $actual_state;
	    
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	    #
	    # Skip if something failed earlier.
	    #
	    next
		if ($result->{node});
	    
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	    if (!TBNodeStateWait($node, $waitstart, (60*6), \$actual_state,
				 (TBDB_NODESTATE_TBFAILED,
				  TBDB_NODESTATE_ISUP))) {
		if ($actual_state eq TBDB_NODESTATE_ISUP) {
		    print STDOUT "reboot ($node): alive and well.\n";
		    SetNodeBootStatus($node, NODEBOOTSTATUS_OKAY);
		    next;
		}
		print STDOUT "*** reboot ($node): reported a TBFAILED event.\n";
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	    }
	    SetNodeBootStatus($node, NODEBOOTSTATUS_FAILED);
	    $result->{$node} = -1;
	    $failed++;
	}
    }
 done:    
    print "reboot: Done. There were $failed failures.\n";

    if ($asyncmode || $pipemode) {
	#
	# We are a child. Send back the results to the parent side
	# and *exit* with status instead of returning it.
	# 
	foreach my $node (keys(%{ $result })) {
	    my $status = $result->{$node};

	    print CHILD_WRITER "$node,$status\n";
	}
	close(CHILD_WRITER);
	exit($failed);
    }
    return $failed;
}

#
# Reboot a node in a child process. Return the pid to the parent so
# that it can wait on all the children later.
#
sub RebootNode {
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    my ($pc, $reconfig, $killmode, $rebootmode) = @_;
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    my ($status, $syspid, $mypid, $didipod, $nodestate);

    if ($reconfig) {
	print "reboot ($pc): Attempting to reconfigure ...\n";
    }
    else {
	print "reboot ($pc): Attempting to reboot ...\n";
    }

    # Report some activity into last_ext_act
    TBActivityReport($pc);

    #
    # Is the node in PXEWAIT? If so we want to wake it up so that it can
    # query bootinfo and do what it is supposed to do, without a real reboot.
    # We send the initial wakeup from here, but let stated deal with it
    # failing (timeout) and resending it. That means we could be called
    # with the node in PXEWAKEUP, so send it another wakeup. The point is that
    # stated is controlling the timeouts. Eventually stated gives up and uses
    # the -k option to force a power cycle.
    #
    if (! TBGetNodeEventState($pc, \$nodestate)) {
	info("$pc has no event state: power cycle");
	print STDERR "*** reboot ($pc): no event state; will power cycle.\n"
	    if $debug;
	
	# Signal to the called that the node needs to be power cycled
	return -2;
    }
    if ($nodestate eq TBDB_NODESTATE_PXEWAIT() ||
	$nodestate eq TBDB_NODESTATE_PXEWAKEUP()) {
	#
	# In killmode, we do not want to bother with sending a wakeup event.
	# Just do the power cycle. This is used to unstick a machine that
	# is in waitmode, but not responding to the wakeups.
	#
	if ($killmode) {
	    info("$pc: in $nodestate: but power cycling in killmode");
	    print STDERR "reboot ($pc): in $nodestate, ".
		"but power cycling in killmode.\n" if $debug;
	    
	    # Signal to the caller that the node needs to be power cycled
	    return -2;
	}

	#
	# The aux program sends the event to stated ...
	#
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	my $reqarg = ($rebootmode ? "-r" : "-q");
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	my $optarg = ($debug ? "-dd" : "");
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	print STDERR "reboot ($pc): in $nodestate: sending wakeup command.\n"
	    if $debug;
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	system("$bisend $optarg $reqarg $pc");
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	if ($?) {
	    info("$pc: PXEWAKEUP failed ... power cycle");
	    print STDERR
		"*** reboot ($pc): PXEWAKEUP failed; will power cycle.\n";
	    
	    # Signal to the caller that the node needs to be power cycled
	    return -2;
	}
	return 0;
    }

    #
    # Do the rest in a child process. After the fork, we do the ping test
    # before we reconnect to the DB. This cuts down on the flurry of connects
    # by a bunch of children (ping will take a moment to run).
    #
    $mypid = fork();
    if ($mypid) {
	return $mypid;
    }

    #
    # See if the machine is pingable. If its not pingable, then we just
    # power cycle the machine rather than wait for ssh to time out.
    #
    if (! DoesPing($pc)) {
	info("$pc appears dead: power cycle");
	print STDERR "*** reboot ($pc): appears dead; will power cycle.\n";
	
	# Signal to the parent that the node needs to be power cycled
	exit(2);
    }
    TBdbfork();

    #
    # Machine is pingable at least. Try to reboot it gracefully,
    # or power cycle anyway if that does not work.
    #
    print STDERR "reboot ($pc): Trying ssh.\n" if $debug;

    #
    # Must change our real UID to root so that ssh will work. We save the old
    # UID so that we can restore it after we finish the ssh
    #
    my $oldUID = $UID;
    $UID = 0;

    #
    # If doing a reconfig, first try that in a child.
    #
    if ($reconfig) {
	TBSetNodeEventState($pc, "RECONFIG");
	$syspid = fork();

	if ($syspid) {
	    local $SIG{ALRM} = sub { kill("TERM", $syspid); };
	    alarm 20;
	    waitpid($syspid, 0);
	    alarm 0;

	    #
	    # The ssh can return non-zero exit status, but still have worked.
	    # FreeBSD for example.
	    #
	    print "reboot ($pc): reconfig returned $?.\n" if $debug;

	    #
	    # Any failure, revert to plain reboot below.
	    #
	    if (! $?) {
		$UID = $oldUID;
		exit(0);
	    }
	}
	else {
	    exec("$ssh -host $pc ".
		 "/usr/local/etc/emulab/rc/rc.bootsetup -b reconfig");
	    exit(0);
	}
    }

    #
    # Run an ssh command in a child process, protected by an alarm to
    # ensure that the ssh is not hung up forever if the machine is in
    # some funky state.
    #
    $syspid = fork();

    if ($syspid) {
	local $SIG{ALRM} = sub { kill("TERM", $syspid); };
	alarm 20;
	waitpid($syspid, 0);
	alarm 0;

	#
	# The ssh can return non-zero exit status, but still have worked.
	# FreeBSD for example.
	#
	print STDERR "reboot ($pc): reboot returned $?.\n" if $debug;

	#
	# If either ssh is not running or it timed out,
	# send it a ping of death.
	#
	if ($? == 256 || $? == 15) {
	    if ($? == 256) {
		print STDERR "*** reboot ($pc): not running sshd.\n" if $debug;
	    } else {
		print STDERR "*** reboot ($pc): wedged.\n" if $debug;
	    }
	    info("$pc: ssh reboot failed ... sending ipod");
	    print STDERR "*** reboot ($pc): Trying Ping-of-Death.\n" if $debug;

	    system("$ipod $pc");
	    $didipod = 1;
	}
	else {
	    info("$pc: ssh reboot ($?)");
	    $didipod = 0;
	}
    }
    else {
	exec("$ssh -host $pc /sbin/reboot");
	exit(0);
    }

    #
    # Restore the old UID so that scripts run from this point on get the
    # user's real UID
    #
    $UID = $oldUID;

    #
    # Okay, before we power cycle lets really make sure. We wait a while
    # for it to stop responding to pings, and if it never goes silent,
    # punch the power button.
    #
    if (WaitTillDead($pc) == 0) {
	my $state = TBDB_NODESTATE_SHUTDOWN;
	TBSetNodeEventState($pc,$state);
	exit(0);
    }

    #
    # Haven't yet tried an ipod, try that and wait again.
    # This further slows down reboot but is probably worth it
    # since this should be a rare case (reboot says it worked but
    # node doesn't reboot) and is vital if the nodes have no
    # power cycle capability to fall back on.
    #
    if (! $didipod) {
	info("$pc: reboot failed ... sending ipod");
	$UID = 0;
	system("$ipod $pc");
	$UID = $oldUID;
	if (WaitTillDead($pc) == 0) {
	    my $state = TBDB_NODESTATE_SHUTDOWN;
	    TBSetNodeEventState($pc,$state);
	    exit(0);
	}
    }

    info("$pc: ipod failed ... power cycle");
    print STDERR "*** reboot ($pc): Still running; will power cycle.\n"
	if $debug;
    exit(2);
}

#
# Reboot a vnode in a child process, and wait for it.
#
sub RebootVNode($$) {
    my ($vnode, $pnode) = @_;
    my $syspid;

    print STDOUT "reboot ($vnode): Rebooting (on $pnode).\n";

    #
    # Run an ssh command in a child process, protected by an alarm to
    # ensure that the ssh is not hung up forever if the machine is in
    # some funky state.
    #
    $syspid = fork();

    if ($syspid) {
	local $SIG{ALRM} = sub { kill("TERM", $syspid); };
	alarm 20;
	waitpid($syspid, 0);
	alarm 0;
	my $exitstatus = $?;

	#
	# The ssh can return non-zero exit status, but still have worked.
	# FreeBSD for example.
	#
	print STDERR "*** reboot ($vnode): returned $exitstatus.\n" if $debug;

	#
	# Look for setup failure, reported back through ssh.
	#
	if ($exitstatus) {
	    if ($exitstatus == 256) {
		print STDERR "*** reboot ($vnode): $pnode is not running sshd.\n"
		    if $debug;
	    }
	    elsif ($exitstatus == 15) {
		print STDERR "*** reboot ($vnode): $pnode is wedged.\n"
		    if $debug;
	    }
	}
	return($exitstatus);
    }
    #
    # Must change our real UID to root so that ssh will work.
    #
    $UID = 0;

    exec("$ssh -host $vnode $CLIENT_BIN/vnodesetup -r -j $vnode");
    exit(0);
}

#
# Power cycle a PC using the testbed power program.
#
sub PowerCycle {
    my @pcs = @_;

    my $pcstring = join(" ",@pcs);

    system("$power cycle $pcstring");
    return $? >> 8;
}

#
# Wait until a machine stops returning ping packets.
#
sub WaitTillDead {
    my ($pc) = @_;

    print STDERR "reboot ($pc): Waiting to die off.\n" if $debug;

    #
    # Sigh, a long ping results in the script waiting until all the
    # packets are sent from all the pings, before it will exit. So,
    # loop doing a bunch of shorter pings.
    #
    for (my $i = 0; $i < 30; $i++) {
	if (! DoesPing($pc)) {
	    print STDERR "reboot ($pc): Died off.\n" if $debug;
	    return 0;
	}
    }
    print STDERR "reboot ($pc): still alive.\n" if $debug;
    return 1;
}

#
# Returns 1 if host is responding to pings, 0 otherwise
# This routine is NOT allowed to do any DB queries!
#
sub DoesPing {
    my ($pc) = @_;
    my $status;
    my $saveuid;

    $saveuid = $UID;
    $UID = 0;
    system("$ping -q -i 0.25 -c 8 -t 2 $pc >/dev/null 2>&1");
    $UID = $saveuid;
    $status = $? >> 8;

    #
    # Ping returns 0 if any packets are returned. Returns 2 if pingable
    # but no packets are returned. Other non-zero error codes indicate
    # other problems.  Any non-zero return indicates "not pingable" to us.
    #
    print STDERR "reboot ($pc): $ping returned $status\n" if $debug;
    if ($status) {
	return 0;
    }
    return 1;
}


sub info($) {
    my $message = shift;
    # Print out log entries like this:
    # Sep 20 09:36:00 $message
    open(LOG,">> $logfile");
    print LOG strftime("%b %e %H:%M:%S",localtime)." $message\n";
    close(LOG);
}

#
# This gets called in the parent, to wait for an async reboot that was
# launched earlier (asyncmode). The child will print the results back
# on the the pipe that was opened between the parent and child. They
# are stuffed into the original results array.
#
sub nodereboot_wait($)
{
    my ($childpid) = @_;

    if (!exists($children{$childpid})) {
	print STDERR "*** reboot: No such child pid $childpid!\n";
	return -1;
    }
    my ($PARENT_READER, $result) = @{ $children{$childpid}};

    #
    # Read back the results.
    # 
    while (<$PARENT_READER>) {
	chomp($_);

	if ($_ =~ /^([-\w]+),([-\d])+$/) {
	    $result->{$1} = $2;
	    print STDERR "reboot ($1): child returned $2 status.\n";
	}
	else {
	    print STDERR "*** reboot: Improper response from child: $_\n";
	}
    }
    
    #
    # And get the actual exit status.
    # 
    waitpid($childpid, 0);
    return $? >> 8;
}

#
# Okay, this is horrible! We cannot include this library into non-setuid
# scripts cause a lot of this stuff needs to be run as root. So provide an
# interface that is equiv to the library interface above, but which execs
# an instance of node_reboot and waits for the results.
#
sub nodereboot_exec($$)
{
    my ($args, $result) = @_;
    my $asyncmode = 0;

    #
    # Create a suitable command line from arg hash.
    #
    my $cmdline = "";

    $cmdline .= "-d"
	if (exists($args->{'debug'}) && $args->{'debug'});
    $cmdline .= " -f"
	if (exists($args->{'powercycle'}) && $args->{'powercycle'});
882 883
    $cmdline .= " -b"
	if (exists($args->{'rebootmode'}) && $args->{'rebootmode'});
884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949
    $cmdline .= " -w"
	if (exists($args->{'waitmode'}) && $args->{'waitmode'});
    $cmdline .= " -r"
	if (exists($args->{'realmode'}) && $args->{'realmode'});
    $cmdline .= " -k"
	if (exists($args->{'killmode'}) && $args->{'killmode'});
    $cmdline .= " -a"
	if (exists($args->{'freemode'}) && $args->{'freemode'});
    $cmdline .= " -c"
	if (exists($args->{'reconfig'}) && $args->{'reconfig'});
    $cmdline .= " @{ $args->{'nodelist'}}";
    
    $asyncmode = $args->{'asyncmode'} if (exists($args->{'asyncmode'}));
	    
    #
    # Create a pipe to read back results from the child we will create.
    #
    if (! pipe(PARENT_READER, CHILD_WRITER)) {
	print STDERR "*** reboot: creating pipe: $!\n";
	return -1;
    }
    CHILD_WRITER->autoflush(1);

    #
    # ACK! Perl defaults to close-on-exec? Why is that?
    # 
    fcntl(CHILD_WRITER, F_SETFD, 0);

    if (my $childpid = fork()) {
	close(CHILD_WRITER);

	#
	# Save the info we need for calling nodereboot_wait() above.
	# 
	$children{$childpid} = [ *PARENT_READER, $result ];

	#
	# If asyncmode we return right away. The caller will need to
	# use the nodereboot_wait() routine above.
	#
	if ($asyncmode) {
	    return $childpid;
	}

	#
	# Block waiting.
	#
	return nodereboot_wait($childpid);
    }
    close(PARENT_READER);

    #
    # Pass the fd number to the child.
    # 
    $ENV{'REBOOTPIPENO'} = fileno(CHILD_WRITER);
   
    #
    # Child execs the instance of node_reboot, with an extra open fd.
    #
    exec("$reboot $cmdline");
    die("Could not exec $reboot!");
    
}

# _Always_ make sure that this 1 is at the end of the file...
1;