#!/usr/bin/env perl

# This script is used to configure the mics on the host. 
# This script is run by xdsh from MN/SN to the host 
# parameters
#  -m xcatmaster 
#  -p the path of the mic configuration file. Generally, it's /tftpboot/xcat/miccfg/miccfg.hostname

use strict;
use IO::Socket;

use File::Path;
use File::Copy;
use Getopt::Long;

# enable the autoflush of stdout
select STDOUT;
$| = 1;

my $tmppath = "/tmp/mictmp";
my $logpath = "/var/log/xcat/";
my $logfile = "$logpath/configmic.log";
my $micmnt = "/opt/intel/mic/mnt";

mkpath $tmppath;
mkpath $micmnt;
#open the log file
open (LOG, ">>$logfile") or die "Error: cannot open $logfile\n";
print LOG "\n\n====================================================\nStart mic configuratoin: ".`date`."\n";

my ($master, $cfgpath);
GetOptions ('m=s'=>\$master, 'p=s'=>\$cfgpath);
unless ($master && $cfgpath) {
    outputmsg("Error: the -m master and -p path arguments must be specified for configmic.\n", 1);
}

# get the correct host name for the host
my $nodename;
my $masterip = `getent hosts $master | awk {'print \$1'}`;
chomp($masterip);
my $myip = `ip route get $masterip| head -n 1 | sed 's/^.*src//g' | awk {'print \$1'}`;
my $myipinfo =`getent hosts $myip`;
if ($myipinfo =~ /([^\s]+)\s+([^\s]+)\s+([^\s]+)/) {
    my $n1 = $2;
    my $n2 = $3;
    if (length($n1) > length($n2)) {
        $nodename = $n2;
    } else {
        $nodename = $n1;
    }
} elsif ($myipinfo =~ /([^\s]+)\s+([^\s]+)/) {
    $nodename = $2;
} else {
    outputmsg("Error: cannot get the hostname of the host node\n", 2);
}

# download the mic configuration file from master
my $cmd = "wget -N --waitretry=10 --random-wait -T 60 http://$master/$cfgpath/miccfg.$nodename  -P $tmppath";
my ($rc, $output) = runsyscmd ($cmd, "Error: failed to download mic configuration file from $master\n", 3);

unless (-r "$tmppath/miccfg.$nodename") {
    runsyscmd ("Error: cannot get the mic configuration file from http://$master/$cfgpath/miccfg.$nodename\n", 4);
}

# parse the configuration file 
unless (open (CFGFILE, "<$tmppath/miccfg.$nodename")) {
    runsyscmd ("Error: cannot open $tmppath/miccfg.$nodename\n", 5);
}

# the configureation file should have the following format
#miclist=mic0
#0:ip=10.10.10.1|br=mybr0|name=host1-mic0|onboot=yes|vlog=no
#imgpath=/install/mpss3.1
#overlay=ol1

my %miccfg;
my $miclist;
my $overlay;
my $ospath;
while (<CFGFILE>) {
    if (/(\d+):(.*)/) {
        my $deviceid = $1;
        my @params = split (/\|/, $2);
        foreach (@params) {
            my ($n, $v) = split (/=/, $_);
            $miccfg{$deviceid}{$n} = $v;
        }
    } elsif (/^miclist=(.*)/) {
        $miclist = $1;
    } elsif (/^overlay=(.*)/) {
        $overlay = $1;
    } elsif (/^imgpath=(.*)/) {
        $ospath= $1;
    }
}
close (CFGFILE);

$miclist =~ s/,/ /g;

# add the mount entry for mounting of root fs from master to /etc/fstab
# e.g. mount $master:/install/mpss3 /opt/intel/mic/mnt
$cmd = "grep $master:$ospath $micmnt /etc/fstab ";
($rc, $output) = runsyscmd ($cmd);
if ($rc) {
    # not found the exact mount entry
    $cmd = "grep $micmnt /etc/fstab";
    ($rc, $output) = runsyscmd ($cmd);
    if (!$rc) {
        # found the mount to $micmnt with another master or directory, remove the entry and umount it
        my $trans = $micmnt;
        $trans =~ s/\//\\\//g;
        $cmd = "sed \"/$trans/d\" /etc/fstab > $tmppath/fstab.tmp";
        runsyscmd ($cmd, "Error: failed to configure fstab.\n", 6);
        copy ("$tmppath/fstab.tmp", "/etc/fstab");
        $cmd = "umount -l -f $micmnt";
        runsyscmd ($cmd, "Error: failed to run umount -l -f $micmnt\n", 7);
    }
    $cmd = "echo \"$master:$ospath $micmnt nfs timeo=14,intr 1 2\" >>/etc/fstab";
    runsyscmd ($cmd);
    $cmd = "mount -a";
    runsyscmd ($cmd);
}

# make sure the remote files are accessable 
unless (-r "$micmnt/opt/intel/mic/filesystem/base.filelist") {
    outputmsg("Error: cannot access the $micmnt/opt/intel/mic/filesystem/base.filelist\n", 8);
}

# start to configure the mic
# stop the mpss service first
$cmd = "service mpss stop";
runsyscmd ($cmd, "Error: failed to stop mpss service.\n", 100);

# make sute the mpss has been stopped
my $i = 5;
while ($i > 0) {
   $cmd = "service mpss status";
    ($rc, $output) = runsyscmd ($cmd);
    if (grep /mpss is stopped/, @$output) {
        last;
    }
    sleep 2;
    $i--;
}

# remove the mic configuration file
unlink ("/etc/sysconfig/mic/default.conf");
foreach my $mic (split (/ /, $miclist)) {
    unlink ("/etc/sysconfig/mic/$mic.conf");
    unlink ("/opt/intel/mic/filesystem/$mic.filelist");
    rmtree ("/opt/intel/mic/filesystem/$mic");
}

# reset the configuration to default
$cmd = "micctrl --initdefaults $miclist";
runsyscmd ($cmd, "Error: failed to initiate the mic devices.\n", 200);

# configure the base dir
$cmd = "micctrl --basedir=/opt/intel/mic/mnt/opt/intel/mic/filesystem/base --list=/opt/intel/mic/mnt/opt/intel/mic/filesystem/base.filelist $miclist";
runsyscmd ($cmd, "Error: failed to change the base dir for mic file system..\n", 101);

# configure the commondir
$cmd = "micctrl --commondir=/opt/intel/mic/mnt/opt/intel/mic/filesystem/common --list=/opt/intel/mic/mnt/opt/intel/mic/filesystem/common.filelist $miclist";
runsyscmd ($cmd, "Error: failed to change the common dir for mic file system.\n", 102);

# configure the overlay
my @ols = split (/,/, $overlay);
foreach (@ols) {
    $cmd = "micctrl --overlay=filelist --state=on --source=/opt/intel/mic/mnt/opt/intel/mic/filesystem/overlay/$_ --target=/opt/intel/mic/mnt/opt/intel/mic/filesystem/overlay/$_.filelist $miclist";
    runsyscmd ($cmd, "Error: failed to change the overlay dir for mic file system.\n", 103);
}

# do the mic specific configuration
$cmd = "ip -4 addr show";
($rc, $output) = runsyscmd ($cmd);
$cmd = "ip -4 route show";
my ($rc2, $output2) = runsyscmd ($cmd);
foreach my $micid (keys %miccfg) {
    my $micname = $miccfg{$micid}{'name'};
    # set the boot device to be staticramfs so that the osimage don't need to generated for every boot
    $cmd = "micctrl --rootdev=StaticRamFS --target=/opt/intel/mic/filesystem/$micname.image mic$micid";
    runsyscmd ($cmd, "Error: failed to set root image for mic.\n", 104);

    # set the linux kernel location
    $cmd = "micctrl --osimage=$micmnt/lib/firmware/mic/uos.img mic$micid";
    runsyscmd ($cmd, "Error: failed to linux kernle location for mic.\n", 105);

    # set the autoboot
    if ($miccfg{$micid}{'onboot'} =~ /no/i) {
        $cmd = "micctrl --autoboot=no mic$micid";
    } elsif($miccfg{$micid}{'onboot'} =~ /yes/i) {
        $cmd = "micctrl --autoboot=yes mic$micid";
    }
    runsyscmd ($cmd, "Error: failed to set the autoboot for mic.\n", 106);

    # set the hostname
    $cmd = "sed \"s/Hostname .*/Hostname \"$micname\"/\" /etc/sysconfig/mic/mic$micid.conf > $tmppath/mic$micid.conf";
    runsyscmd ($cmd, "Error: failed to set hostname for mic.\n", 107);
    copy ("$tmppath/mic$micid.conf", "/etc/sysconfig/mic/mic$micid.conf");

    # configure the Verbose log
    if ($miccfg{$micid}{'vlog'} =~ /yes/i) {
        $cmd = "sed \"s/VerboseLogging .*/VerboseLogging \"Enabled\"/\" /etc/sysconfig/mic/mic$micid.conf > $tmppath/mic$micid.conf";
        runsyscmd ($cmd, "Error: failed to set Verbose log for mic.\n", 108);
        copy ("$tmppath/mic$micid.conf", "/etc/sysconfig/mic/mic$micid.conf");
    }

    # configure the bridge and ip for the mic
    # get the ip of the bridge
    my $brg = $miccfg{$micid}{br};
    my ($brip, $netbit, $brc, $mtu);
    foreach (@$output) {
        if (/inet\s+([\d\.]+)\/(\d+)\s+brd\s+([\d\.]+) scope global $brg/) {
            $brip = $1;
            $netbit = $2;
            $brc = $3;
            last;
        } elsif (/\d+:\s+$brg:.*mtu\s+(\d+)/) {
            $mtu = $1;
        }
    }

    unless ($brip && $netbit && $brc) {
        outputmsg("Error: failed to get ip for the bridge $brg.\n", 110);
    }

    # add the bridge to mic configuration
    # since the micctrl --addbridge=<brgname>  --type=external --ip=<ip of brg> --netbits=8 does not
    # work with '--netbis=8', the bridge configuration has been done by changing cfg file directly.
    $cmd = "echo \"Bridge $brg External $brip $netbit $mtu\" >> /etc/sysconfig/mic/default.conf";
    runsyscmd ($cmd);

    # configre network for each mic
    $cmd = "micctrl --network=static --bridge=".$brg." --ip=".$miccfg{$micid}{ip}." mic$micid";
    runsyscmd ($cmd, "Error: failed to generate IP configuration for mic.\n", 104);

    # take the configuration to effect
    $cmd = "micctrl --resetconfig mic$micid";
    runsyscmd ($cmd, "Error: failed to spread the configuration.\n", 201);

    # get the gateway of the bridge
    my $netmask = 2**$netbit - 1 << (32 - $netbit);
    my $brnet = unpack("N", inet_aton($brip));
    $brnet &= $netmask;
    $brnet = inet_ntoa(pack("N", $brnet));
    my $brgw;
    foreach (@$output2) {
        if (/$brnet\/$netbit\s+dev\s+$brg.*src\s+([\d\.]+)/) {
            $brgw = $1;
            last;
        }
    }

    # configure the mic interface to the real interface cfg file instead of mic cfg file
    # this also because the defect of intel tool so that we have to do it separated
    my @ifcfg = ("IPADDR=$miccfg{$micid}{ip}\n", "GATEWAY=$brgw\n", "PREFIX=$netbit\n");
    unless (open (IFCFG, ">/opt/intel/mic/filesystem/mic$micid/etc/sysconfig/network/ifcfg-mic0")) {
        outputmsg ("Error: cannot open ifcfg-mic$micid\n", 111);
    }
    print IFCFG @ifcfg;
    close (IFCFG);

    # copy the system files which generated by genimage to the micdir
    # e.g. /etc/hosts /etc/passwd ...
    my $src = "$micmnt/opt/intel/mic/filesystem/overlay/system/*";
    my $dst = "/opt/intel/mic/filesystem/mic$micid";
    $cmd = "/bin/cp -rf $src $dst";
    runsyscmd ($cmd, "Error: failed to copy the overlay dir.\n", 300);

    # generate the static root file system in ramdisk format
    $cmd = "micctrl --updateramfs mic$micid";
    runsyscmd ($cmd, "Error: failed to generate the static ramfs.\n", 301);
}

# start the mpss service after the configuration
$cmd = "service mpss start >/dev/null 2>&1";
system($cmd);

$i = 5;
while ($i > 0) {
   $cmd = "service mpss status";
    ($rc, $output) = runsyscmd ($cmd, "Error: failed to get the status of mpss.\n", 100);
    if (grep /mpss is running/, @$output) {
        last;
    }
    sleep 2;
    $i--;
}

# notice nodeset command, the configuratoin has been done
foreach my $micid (keys %miccfg) {
    outputmsg ("MICMSG:$miccfg{$micid}{'name'}: Done\n");
}

print LOG "mpss has been started\n";
print LOG "\nFinish the mic configuratoin: ".`date`."====================================================\n";

close (LOG);

# since the start of mpss service created a new process and for some reason the process caused the hang of
# sshd root@notty on the host (that means the xdsh cannot get connection closed from host), a work around 
# is to kill the sshd connection by force
$cmd = "ps -ef | grep sshd | grep notty |awk -F\' \' \'{print \$2}\'";
($rc, $output) = runsyscmd ($cmd);
foreach (@$output) {
    kill 15, $_;
}

exit 0;

# run command
sub runsyscmd {
    my $cmd = shift;
    my $errmsg = shift;
    my $rc = shift;

    print LOG "---------------------------------------------\n";
    print LOG "Run command: $cmd\n";

    if (!($cmd =~ /2>&1$/)) { $cmd .= ' 2>&1'; }  
    my @output = `$cmd`;

    my $errcode = 0;
    if ($?) {
        $errcode = $? >> 8;
    }

    foreach (@output) {
        print LOG $_;
    }
    print LOG "---------------------------------------------\n";

    if ($rc && $errcode) {
        outputmsg($errmsg, $rc);
        exit $rc;
    }
    return ($errcode, \@output);
}

# display the output message
sub outputmsg{
    my $msg = shift;
    my $rc  =shift;
    print LOG $msg;
    print $msg;
    if ($rc) {
        exit $rc;
    }
}