Subversion Repositories sysadmin_scripts

#! /usr/bin/env perl

use strict;

use warnings;

use YAML::XS qw(DumpFile LoadFile); # libyaml-libyaml-perl

use Getopt::Std;

$main::VERSION = '0.1';

my $dbFile = 'virtinfo_db.yaml';

my $lockFile = 'virtinfo.lock';

use Data::Dumper;

#

# find where the script is actually located as cfg should be there

#

sub getScriptLocation {

   use strict;

   use File::Spec::Functions qw(rel2abs);

   use File::Basename;

   return dirname(rel2abs($0));

}

sub main::HELP_MESSAGE {

   print "\nScript reads running virtuals and store results in database\n\n";

   print "-s          Show database and exit\n";

   print "-c filename Use alternative database\n";

   print "-n          Don't update the database\n";

   print "-v          Be Verbose (show some stats)\n";

   print "-r          Report - only display if something changed\n";

}

sub main::VERSION {

   &HELP_MESSAGE();

}

sub readDB {

   my $lock = shift;

   my $db;

   sleep(5) if -e $lockFile;

   die "Could not get lock on $dbFile: Aborting\n" if -e $lockFile;

   `touch $lockFile` unless $lock;

   $db = LoadFile( $dbFile ) if ( -e $dbFile );

   return $db;

}

sub saveDB {

   my ($db, $verbose)  = @_;

   print "Updating database\n" if $verbose;

   DumpFile( $dbFile, $db );

}

# many of the outputs produce key:value pairs

# we will parse this into a hash

sub parseDelimited {

   my $delimiter = shift;

   my %return;

   while ( my $line = shift ) {

      chomp $line;

      next unless $line;

      my ( $key, $value ) = split( /$delimiter/, $line );

      $return{lc &trim($key) } = &trim($value);

   }

   return \%return;

}

sub getNode {

   my @info = `virsh nodeinfo`;

   my $hypervisor = &parseDelimited( ':', @info );

   return $hypervisor;

}

sub getRunningVirtuals {

   my @domains = `virsh list`;

   chomp @domains;

   my %domains;

   foreach my $domain ( @domains ) {

      # skip the headers

      next if $domain =~ m/^(Id)|(--)/;

      if ( $domain =~ m/^\s*(\d+)\s+([^\s]+)\s/ ) {

         $domains{$2}{'id'} = $1;

      }

   }

   return \%domains;

}

sub updateDB {

   my ( $node, $self, $verbose ) = @_; 

   # get a list of all running virtuals

   my $virts = &getRunningVirtuals();

   my @a = sort keys %$virts;

   my @b = sort keys  %{ $node->{$self}->{'virtuals'} };

   return 0 # return if they are the same, no action needed

      if &compareArray( \@a, \@b );

   # something has changed, so load all information again

   print "Something has changed, so loading everything again\n" if $verbose;

   $node->{$self}->{'hypervisor'} = &getNode();

   $node->{$self}->{'virtuals'} = $virts;;

   foreach my $domain ( keys %{$node->{$self}->{'virtuals'}} ) {

      next unless $domain;

      my @info = `virsh dominfo $domain`;

      my $vnc = `virsh vncdisplay $domain`;

      chomp $vnc;

      $vnc =~ m/^.*:(\d+)$/;

      push @info, "vncport: $1";

      $node->{$self}->{'virtuals'}->{$domain} = &parseDelimited( ':', @info );

   }

   return ( 1, $node );;

}

# remove leading and trailing whitespace from string

sub trim {

   my $string = shift;

   $string =~ s/^\s+|\s+$//;

   return $string;

}

sub showReport {

   my $conf = shift;

   foreach my $node ( keys %$conf ) {

      print "$node\n";

      foreach my $virt ( keys %{ $conf->{$node}->{'virtuals'} } ) {

         print "\t$virt\n";

      }

   }

}

sub compareArray {

   my ($arr1, $arr2 ) = @_;

   # if they don't have the same number of elements, not equal

   return 0 if @$arr1 != @$arr2;

   for ( my $i = 0; $i < scalar( @$arr1 ); $i++ ) {

      return 0 unless $$arr1[$i] eq $$arr2[$i];

   }

   return 1;

}

my $path = &getScriptLocation() . '/';

$dbFile = $path . $dbFile;

$lockFile = $path . $lockFile;

$Getopt::Std::STANDARD_HELP_VERSION = 1;

my %options = ();

getopts( 'vosrc:n', \%options );

if ( $options{'o'} ) {

   print "Dumping cli parameters\n";

   foreach my $option ( keys %options ) {

      print "$option\t[$options{$option}]\n";

   }

}

my $db = &readDB( $options{'n'} );

my $self = `hostname -f`;

chomp $self;

if ( $options{'s'} ) {

   &showReport( $db );

} elsif ( ! $options{ 'n' } ) {

   print STDERR "Updating the database\n" if $options{'v'};

   my $dirty = 0;

   ( $dirty, $db ) = &updateDB( $db,$self, $options{'v'} );

   if ( $dirty ) {

      print "Virtuals changed on $self\n" if ($options{'r'});

      &saveDB( $db, $options{'v'} );

   }

}

`rm $lockFile` if -e $lockFile;

1;