rc.cdboot 14.1 KB
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#!/usr/bin/perl -w
#
# EMULAB-COPYRIGHT
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# Copyright (c) 2007-2012 University of Utah and the Flux Group.
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# All rights reserved.
#
use English;
use Getopt::Std;
use File::Basename;
use Fcntl;
use IO::Handle;

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# Drag in path stuff so we can find emulab stuff.
BEGIN { require "/etc/emulab/paths.pm"; import emulabpaths; }

use liblocsetup;

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sub WhichRawDisk();

#
# This script is run directly from boot. It should NOT be run after
# that since some stuff is not setup to properly restart yet. For
# general reconfig or update, use rc.config instead.
#
sub usage()
{
    print "Usage: " . scriptname() . "boot|shutdown|reconfig|reset\n";
    exit(1);
}
my $optlist    = "";
my $action     = "boot";
my $debug      = 1;

my $cmdline    = "$0 " . join(" ",@ARGV);

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

# Drag in path stuff so we can find emulab stuff.
BEGIN { require "/etc/emulab/paths.pm"; import emulabpaths; }

# Only root.
if ($EUID != 0) {
    die("*** $0:\n".
	"    Must be root to run this script!\n");
}

# Script specific goo.
my $RCDIR   = "$BINDIR/rc";
my $LOGFILE = "$LOGDIR/cdbootsetup.debug";

#
# Disk related parameters
#

# where to find kernel config output
my $dmesgcmd = "/sbin/dmesg";
my $dmesgfile = "/var/run/dmesg.boot";

# preferred ordering of disks to use
my @bsd_preferred = ("ar", "aacd", "amrd", "mlxd", "twed", "ad", "da");
my @linux_preferred = ("sd", "hd");
my @bsd_units = (0, 1, 2, 3, 4, 5, 6, 7);
my @linux_units = qw/a b c d e f g/;

# min disk size we can use (in MB)
my $MINDISKSIZE = 8000;

my $defrawdisk	= "/dev/ad0";
my $rawbootdisk;

# Set below.
my $bossname;
my $bossip;

# For widearea.
my $privkey;

#
# Load the OS independent support library. It will load the OS dependent
# library and initialize itself. 
# 
use libsetup;
use libtmcc;
use librc;

# Protos.
sub doboot();
sub doshutdown();
sub doreconfig();
sub docleanup();
sub BootNotify($$);
sub BootWhat();

# Allow default above.
if (@ARGV) {
    $action = $ARGV[0];
}

if ($action eq "boot" || $action eq "reconfig") {
    #
    # We want to save all of the output off, but also dup it to the console.
    #
    open(LOG, "> $LOGFILE") or
	BootNotify(-1, "Could not open $LOGFILE!");
    LOG->autoflush(1);

    #
    # This open implicitly forks a child, which goes on to execute the rest
    # of the script. The parent is going to sit in this loop and capture the
    # output of the child, writing it to the logfile and to the console.
    # 
    if (open(FOO, "-|")) {
	while (<FOO>) {
	    print LOG $_;
	    print "$_";
	}
	close(LOG);
	close(FOO);
	# The CDROM *always* reports back what it can.
	BootNotify($? >> 8, "CD Boot");
	exit(0);
    }
    open(STDERR, ">&STDOUT");
}

# Execute the action.
SWITCH: for ($action) {
    /^boot$/i && do {
	doboot();
	last SWITCH;
    };
    /^shutdown$/i && do {
	doshutdown();
	last SWITCH;
    };
    /^reconfig$/i && do {
	doreconfig();
	last SWITCH;
    };
    /^reset$/i && do {
	docleanup();
	last SWITCH;
    };
    /^rawdisk$/i && do {
	WhichRawDisk();
	print "$rawbootdisk\n";
	last SWITCH;
    };
    fatal("Invalid action: $action\n");
}
exit(0);

#
# Notify boss of what happened. If the code is non-zero, then also
# generate a booterrno and a TBFAILED state transition. 
#
sub BootNotify($$)
{
    my ($code, $msg) = @_;

    print "$msg\n";
    system("sync");
    
    #
    # Send the console log to the server.
    #
    if (-e $LOGFILE && -s $LOGFILE &&
	tmcc(TMCCCMD_BOOTLOG, "", undef,
	     ("datafile" => $LOGFILE, "timeout" => 10)) < 0) {
	print "Error sending TBFAILED to Emulab Control!\n";
    }

    return
	if (!$code);
    
    if (tmcc(TMCCCMD_STATE, "PXEFAILED") < 0) {
	print "Error sending PXEFAILED to Emulab Control!\n";
    }
    exit($code);
}

#
# Boot Action.
#
sub doboot()
{
    my $bootdev;
    
    #
    # The CD does some different stuff.
    #
    print("Doing Testbed Setup on a CD/Dongle\n");

    # Get the boss info for below.
    ($bossname, $bossip) = tmccbossinfo();
    if (!defined($bossname)) {
	fatal("Could not determine the name of the boss server!");
    }

    #
    # Widearea nodes need to checkin and tell Emulab in case we are a new
    # node, or more likely, our IP address has changed. 
    #
    if (REMOTE()) {
	my $hostname = `hostname`;
	chomp($hostname);

	$privkey = `cat $ETCDIR/emulab-privkey`;
	chomp($privkey);

	my $IP = `cat $BOOTDIR/myip`;
	chomp($IP);

	my $URL = "https://$bossname/wanodecheckin.php".
	    "?IP=$IP&privkey=$privkey" .
	    (defined($hostname) && $hostname ne ""
	     ? "&hostname=$hostname" : "");

	system("$WGET -O - '$URL'");
    }

    # Enable IPoD
    if (-x "$RCDIR/rc.ipod") {
	print("Setting up Ping of Death\n");
	system("$RCDIR/rc.ipod");
	# This is allowed to fail; ipod might not be supported.
    }

    if (-x "$BINDIR/osconfig" && 
	(!defined($ENV{"ELAB_UPD_DONE"}) || !$ENV{"ELAB_UPD_DONE"})) {
	if (!system("$BINDIR/osconfig premfs")) {
	    # success -- must set our marker and exec this script
	    $ENV{"ELAB_UPD_DONE"} = 1;
	    exec($cmdline);
	}
    }

    # Will not return until it gets something it likes.
    $bootdev = WhichRawDisk();
    print("Using $bootdev for config sector ...\n");

    #
    # Report back the CD version
    # XXX may want to consider not doing then on every boot
    #
    if (-e "$ETCDIR/emuboot-volid") {
	my $cdversion = `cat $ETCDIR/emuboot-volid`;
	chomp($cdversion);
	tmcc(TMCCCMD_HOSTINFO, "CDVERSION=$cdversion");
    }

  bootinfo:
    #
    # If this is first install on this disk, or if the disk has just been
    # loaded, initialize the magic sector so that it boots from the CD.
    # We might reset that below. 
    #
    system("tbbootconfig -v $bootdev");
    if ($?) {
	print("No valid boot config on $bootdev; initializing ...\n");
	system("tbbootconfig -d -f -c 1 -k 0 ".
	       (defined($privkey) ? "-e '$privkey' " : "") . "-m 1 $bootdev");
	if ($?) {
	    print("Error running tbbootconfig; falling back to MFS boot\n");
	    goto mfs;
	}
    }

    #
    # Use the bootinfo client to find out what we should do. Note that
    # like the PXE version, this client will block when told to WAIT
    # by the bootinfo server, returning only when bootinfo says that the node
    # should boot (has been allocated or needs to be reloaded).
    #
    print("Asking bootinfo what to do; warning, this might block ...\n");
    my $bootwhat = BootWhat();
    chomp($bootwhat);

    if ($debug) {
	print("Bootinfo returned '$bootwhat'\n");
	sleep(10);
    }

    if ($bootwhat eq "reboot") {
	print("Bootinfo says to reboot ... so thats what we gonna do!\n");
	system("sync");
	BootNotify(0, "Bootinfo said to reboot");
	system("reboot");
	sleep(10000);
    }
    elsif ($bootwhat =~ /^partition:(\d)\s*(.*)/) {
	my $bpart = $1;
	my $cmdline = $2;
	my $ptype = 0;

	if ($bpart eq "0") {
	    print("Bootinfo says to boot from MBR ...\n");
	    $bpart = 255; # XXX
	} else {
	    print("Bootinfo says to boot slice $bpart");
	    if ($cmdline ne "") {
		print(" with command line '$cmdline'");
	    }
	    print(".  Checking MBR first ...\n");
	    $ptype = VerifyMBR($bootdev, $bpart);
	    if ($ptype < 0) {
		print("Partition $bpart on $bootdev not valid; ".
		      "falling back to MFS\n");
		goto mfs;
	    }
	}
	system("tbbootconfig -d -c 0 -k $bpart -m 1 $bootdev");
	if ($?) {
	    print("Error running tbbootconfig; falling back to MFS boot\n");
	    goto mfs;
	}
	if ($cmdline ne "") {
	    # XXX Linux only.  We need to generalize here...
	    if ($ptype == 131) {
		system("groklilo -c '$cmdline' $bpart $bootdev");
		if ($?) {
		    print("Error setting command line; falling back to MFS boot\n");
		    goto mfs;
		}
	    }
	    else {
		print("WARNING: command line ignored for ptype $ptype\n");
	    }
	}
	system("sync");
	BootNotify(0, "Bootinfo said to boot partition $bpart");
	system("reboot");
	sleep(10000);
    }
    elsif ($bootwhat =~ /^mfs:([-\w\.]*:)?(.*)$/) {
	print("Bootinfo says to boot MFS $2!\n");
	my $mfs = basename($2);

	#
	# We know about a couple of different MFSs, but thats it!
	#
	if ($mfs eq "freebsd.newnode") {
	    system("$BINDIR/newclient");
	    #
	    # Not supposed to do anything else after this, so just
	    # exit to avoid booting into the MFS.
	    #
	    return 0;
	}
	elsif ($mfs =~ /^frisbee.*$/) {
	    #
	    # Run the frisbee script. We do not want rc.frisbee to reboot
	    # though since once the frisbee is done, we can immediately go
	    # back through bootinfo to see what to do next, avoiding a full
	    # reboot cycle!
	    #
	    if (system("$RCDIR/rc.frisbee -noreboot") == 0) {
		print("Waiting a few seconds for events to settle ...\n");
		sleep(10);
		goto bootinfo;
	    }
	    fatal("Failed to reload the disk. Sending data to Emulab.");
	    # Drop into the shell to debug.
	    return 1;
	}
	elsif ($mfs =~ /^freebsd.*$/) {
	    goto mfs;
	}
	elsif ($bootwhat =~ /^mfs:localhost:partition:(\d+)$/ ||
	       $bootwhat =~ /^mfs:127\.0\.0\.1:partition:(\d+)$/) {
	    #
	    # In this case, we boot from an "alternate" mfs on the Nth 
	    # partition of the default boot media.  One mfs per partition.
	    #
	    my $part = $1 + 0;
	    if ($part < 1 || $part > 4) {
		print("Invalid local mfs partition $part;" . 
		      " falling back to default MFS boot\n");
		goto mfs;
	    }
	    # Boot from the bootloader device, and the specified partition
	    system("tbbootconfig -d -b 0xfe -k $part -c 0 -m 1 $bootdev");
	    if ($?) {
		print("Error running tbbootconfig;" . 
		      "falling back to default MFS boot\n");
		goto mfs;
	    }
	    system("sync");
	    BootNotify(0,"Bootinfo said to boot local partition" . 
		       " $part on default boot device; rebooting.");
	    system("reboot");
	    sleep(10000);
	}
	else {
	    # Default to FreeBSD MFS.
	    goto mfs;
	}
    }

    #
    # At this point, chain over to the MFS boot, since the CD mirrors
    # that when doing a standard BSD boot.
    #
  mfs:
    if (-x "$RCDIR/rc.mfs") {
	print("Switching over to MFS boot setup\n");
	system("$RCDIR/rc.mfs");
	# Fall through on failure.
    }
}

#
# Shutdown Action.
#
sub doshutdown()
{
}

#
# Node Reconfig Action (without rebooting).
#
sub doreconfig()
{
}

#
# Node cleanup action (node is reset to completely clean state).
#
sub docleanup()
{
}

#
# Which raw disk. Prompt if we cannot come up with a good guess.
# Note: raw and block devices are one in the same now.
#
sub WhichRawDisk()
{
    #
    # Find the list of configured disks
    #
    my @list = DiskList();

    #
    # Search the drives looking for one with a valid header.
    # 
    foreach my $disk (@list) {
	my $guess = "/dev/${disk}";

	system("tbbootconfig -v $guess");
	if (! $?) {
	    $rawbootdisk = $guess;
	    goto gotone;
	}
    }

    #
    # None with configuration info, just use the first existing disk
    # which is large enough and is actually accessible.
    #
    foreach my $disk (@list) {
	my $guess = "/dev/${disk}";

	if (DiskSize($disk) >= $MINDISKSIZE && DiskReadable($disk)) {
	    #
	    # Allow for overiding the guess, with short timeout.
	    #
	    $rawbootdisk = Prompt("Which Disk Device is the boot device?",
				  "$guess", 10);
	    goto gotone;
	}
    }
  gotone:
    
    #
    # If still not defined, then loop forever.
    # 
    while (!defined($rawbootdisk) || ! -e $rawbootdisk) {
	$rawbootdisk = Prompt("Which Disk Device is the boot device?",
			      $defrawdisk);
    }
    return $rawbootdisk;
}

#
# Create a list of all disks and their sizes.
#
sub DiskList()
{
	my @disks;
	my @tmp;
	my @preferred;
	my @units;

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	@tmp = os_get_disks();
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	if ($OSNAME eq 'linux') {
		@preferred = @linux_preferred;
		@units = @linux_units;
	}
	elsif ($OSNAME eq 'freebsd') {
		@preferred = @bsd_preferred;
		@units = @bsd_units;
	}

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	for my $disk (@preferred) {
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		for my $unit (@units) {
			for my $dev (@tmp) {
				if ($dev =~ /^$disk$unit/) {
					push @disks, $dev;
				}
			}
		}
	}

    return @disks;
}

sub DiskSize($)
{
    my ($name) = @_;

    my $size = os_get_disk_size($name);
    if (defined $size) {
	    return $size;
    }

    return 0;
}

sub DiskReadable($)
{
    my ($disk) = @_;
    my $dev = "/dev/$disk";

    if (!system("dd if=$dev of=/dev/null bs=512 count=32 >/dev/null 2>&1")) {
	return(1);
    }
    return(0);
}

#
# Spit out a prompt and a default answer. If optional timeout supplied,
# then wait that long before returning the default. Otherwise, wait forever.
#
sub Prompt($$;$)
{
    my ($prompt, $default, $timeout) = @_;

    if (!defined($timeout)) {
	$timeout = 10000000;
    }

    print "$prompt";
    if (defined($default)) {
	print " [$default]";
    }
    print ": ";

    eval {
	local $SIG{ALRM} = sub { die "alarm\n" }; # NB: \n required
	
	alarm $timeout;
	$_ = <STDIN>;
	alarm 0;
    };
    if ($@) {
	if ($@ ne "alarm\n") {
	    die("Unexpected interrupt in prompt\n");
	}
	#
	# Timed out.
	#
	print "\n";
	return $default;
    }
    return undef
	if (!defined($_));
	
    chomp();
    if ($_ eq "") {
	return $default;
    }

    return $_;
}

sub VerifyMBR($$)
{
    my ($bootdev, $partition) = @_;
    my ($size, $type) = os_get_partition_info($bootdev, $partition);

    if ($size == 0) {
	print "Zero length partition $partition\n";
        return -1;
    }

    return $type;
}

#
# Ask bootwhat what to do. 
#
sub BootWhat()
{
    if (!REMOTE()) {
	my $bootwhat = `bootinfoclient -s $bossname`;
	if ($?) {
	    print("Error running bootinfoclient; falling back to MFS boot\n");
	    return "";
	}
	return $bootwhat;
    }
    my @results;

    if (tmcc(TMCCCMD_BOOTWHAT, "", \@results) < 0 || !@results) {
	print "Error getting BOOTWHAT from Emulab Control!\n";
	return "";
    }
    my ($status, $type, $rest) =
	($results[0] =~ /^STATUS=(\w*) TYPE=(\d*)(.*)$/);
    if (!defined($status) || $status ne "success") {
	print "BOOTWHAT did not return success from Emulab Control!\n";
	return "";
    }
    return "reboot"
	if ($type == 5);

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    # don't care about flags
    if ($rest =~ /^\s*FLAGS=\d+\s+(.*)/) {
	$rest = $1;
    }

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    # MFS
    if ($type == 7) {
	my ($what) = ($rest =~ /^\s*WHAT=(.*)/);
	return "mfs:$what";
    }
    # Partition.
    if ($type == 1) {
	my ($what, $cmdline);
	
	if ($rest =~ /^\s*WHAT=(\d*)$/) {
	    $what = $1;
	    $cmdline = "";
	}
	elsif ($rest =~ /^\s*WHAT=(\d*)\s+CMDLINE='(.*)'$/) {
	    $what = $1;
	    $cmdline = $2;
	}
	return "partition:$what $cmdline";
    }
    return "";
}