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#!/usr/bin/env perl
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#!/usr/bin/env perl
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use warnings;
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use warnings;
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use strict;
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use strict;
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# Description: ZFS Disk usage
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use version ; our $VERSION = 'v1.0.0';
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our $VERSION = '1.0';
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# ZFS disks module for sysinfo client
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# Template for modules to be used in sysinfo
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# Author: R. W. Rodolico
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# Author: R. W. Rodolico
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# Date:  2017-11-24
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# Date:   2017-11-24
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#
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# gets information on ZFS partitions. Returns them as a hash
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# gets information on ZFS partitions. Returns them as a hash
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#
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# Revision History
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#
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#
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# find our location and use it for searching for libraries
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# find our location and use it for searching for libraries. library.pm must be in the same directory as the calling script
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# or, if run interactively, in the parent of the modules
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BEGIN {
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BEGIN {
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   use FindBin;
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   use FindBin;
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   use File::Spec;
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   use File::Spec;
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   use lib File::Spec->catdir($FindBin::Bin);
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   # prepend the bin directory and its parent
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   eval( 'use library;' ); die "Could not find library.pm in the code directory\n" if $@;
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   use lib File::Spec->catdir($FindBin::Bin), File::Spec->catdir("$FindBin::Bin/..");
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   eval( 'use Data::Dumper;' );
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   eval( 'use library;' );
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   die sprintf( "Could not find library.pm in %s, INC is %s\n", __FILE__, join( "\n", @INC ) ) if $@;
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}
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}
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#####
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##### Change these to match your needs
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#####
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# Make this a list of all the modules we are going to use. You can replace undef with the version you need, if you like
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my $modulesList = {
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        'Data::Dumper'     => undef,
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   };
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# hash of commands that are needed for the system. key is the name of the command and, in some cases, the value will become
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# the full path (from which or where)
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my $commandsList = {
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# check for valid OS.
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        'zpool' => undef,
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   };
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# list of operating systems this module can be used on.
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my $osList = {
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#         'mswin32' => undef,
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exit 1 unless &checkOS( { 'linux' => undef, 'freebsd' => undef } );
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         'freebsd' => undef,
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         'linux'   => undef,
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   };
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# check for required commands, return 2 if they don't exist. Enter an full list of all commands required. If one doesn't exist
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# script returns a 2
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foreach my $command ( 'zpool' ) {
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   exit 2 unless &validCommandOnSystem( $command );
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# the category the return data should go into. See sysinfo for a list
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}
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my $temp;
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my $device;
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my @temp;
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my $CATEGORY = 'diskinfo';
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my $CATEGORY = 'diskinfo';
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sub zfsComponents {
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#####
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   my $zpoolName = shift;
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##### End of required
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#####
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   my @lines = qx( zpool list -pHv $zpoolName );
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# some variables needed for our system
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   my @result;
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   shift @lines; # we already have the first line of info
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my $errorPrepend = 'error: in ' . __FILE__; # this is prepended to any error messages
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   my @temp = split( "\t", $lines[0] );
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my @out; # temporary location for each line of output
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   push @result, "$CATEGORY\t$zpoolName\tlevel\t$temp[1]";
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# Try to load the modules we need. If we can not, then make a list of missing modules for error message.
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   shift @lines;
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   my @out;
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   while ( $temp = shift @lines ) {
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for my $module ( keys %$modulesList ) {
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      @temp = split( "\t", $temp );
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   eval ( "use $module;" );
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      push @out, $temp[1] if defined $temp[1];
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   push @out, "$errorPrepend Could not load $module" if $@;
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   }
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   push @result, "$CATEGORY\t$zpoolName\tcomponents\t" . join( " ", @out );
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   return join( "\n", @result ) . "\n";
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}
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}
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if ( ! @out && ! checkOS ( $osList ) ) { # check if we are on an acceptible operating system
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    push @out, "$errorPrepend Invalid Operating System";
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}
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if ( !@out && ! validCommandOnSystem ( $commandsList ) ) {
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   push @out, "$errorPrepend Can not find some commands needed";
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}
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if ( !@out ) { # we made it, we have everything, so do the processing
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   #####
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   ##### Your code starts here. Remember to push all output onto @out
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   #####
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   sub zfsComponents {
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      my $zpoolName = shift;
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      my @lines = qx( zpool list -pHv $zpoolName );
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      my @result;
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      shift @lines; # we already have the first line of info
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      my @temp = split( "\t", $lines[0] );
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      push @result, "$CATEGORY\t$zpoolName\tlevel\t$temp[1]";
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      shift @lines;
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      my @out;
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      while ( my $temp = shift @lines ) {
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         @temp = split( "\t", $temp );
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         push @out, $temp[1] if defined $temp[1];
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      }
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      push @result, "$CATEGORY\t$zpoolName\tcomponents\t" . join( " ", @out );
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      return join( "\n", @result ) . "\n";
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   }
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# process zfs
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   # process zfs
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@temp = qx ( zpool list -pH );
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   my @devices = qx ( zpool list -pH );
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foreach $device ( @temp ) {
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   foreach my $device ( @devices ) {
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   chomp $device;
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      chomp $device;
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   my ( $name, $size, $allocated, $free, $expandsz, $frag, $cap, $dedup, $health, $altroot ) = split( "\t", $device );
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      my ( $name, $size, $allocated, $free, $expandsz, $frag, $cap, $dedup, $health, $altroot ) = split( "\t", $device );
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   $size /= 1024;
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      $size /= 1024;
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   $allocated /= 1024;
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      $allocated /= 1024;
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   $allocated = int( $allocated );
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      $allocated = int( $allocated );
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   print "$CATEGORY\t$name\tfstype\tzfs\n"; # next is fs type
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      push @out,  "$CATEGORY\t$name\tfstype\tzfs"; # next is fs type
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   print "$CATEGORY\t$name\tsize\t$size\n"; # total partition size, in k
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      push @out,  "$CATEGORY\t$name\tsize\t$size"; # total partition size, in k
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   print "$CATEGORY\t$name\tused\t$allocated\n"; # disk usage, in k
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      push @out,  "$CATEGORY\t$name\tused\t$allocated"; # disk usage, in k
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   print &zfsComponents( $name );
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      push @out,  @{ &zfsComponents( $name ) };
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} # foreach
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   } # foreach
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   #####
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   ##### Your code ends here.
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   #####
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}
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# If we are testing from the command line (caller is undef), print the results for debugging
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print join( "\n", @out ) . "\n" unless caller;
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# called by do, which has a value of the last assignment made, so make the assignment. The equivilent of a return
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my $return = join( "\n", @out );
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