#!/bin/bash
#%# family=auto

: << EOF
=head1 NAME
zfs_list - Plugin to monitor ZFS Filesystems

This is an extension of the zfs_fs plugin
modified as a multigraph to graph all zfs
filesystems it can find

=head1 CONFIGURATION
  [zfs_list]
  env.ignore_datasets_pattern <Datasets to ignore; String for grep>


=head1 AUTHOR

Adam Michel (elfurbe@furbism.com)


=head1 MAGIC MARKERS

 #%# family=auto

=cut

EOF


. "$MUNIN_LIBDIR/plugins/plugin.sh"

need_multigraph()

if [ "$1" = "autoconf" ]; then
    # Makes little sense to autoconf if you can't suggest
    echo no
    exit 0
fi

if [ "$1" = "suggest" ]; then
	exit 0
fi

# set standard value
ignore_datasets_pattern=${ignore_datasets_pattern:-}

# set search term, based on if the searh pattern is set
if [ -n "$ignore_datasets_pattern" ]; then
  search_term=$(zfs list -Hp -t filesystem,volume | grep -v "$ignore_datasets_pattern" | awk '{print $1}')
else
  search_term=$(zfs list -Hp -t filesystem,volume | awk '{print $1}')
fi



if [ "$1" = "config" ]; then
	for i in $search_term; do
		values=( $(zfs get -p usedbydataset,usedbychildren,usedbysnapshots,usedbyrefreservation,available,quota $i | awk 'BEGIN {total=0;} { if( NR==1 ) next; } !/quota/ {total=total+$3;} {print $3} END{print total;}') )
		fsname=$(clean_fieldname $(echo "$i" | sed 's/\//__/g'))

		echo <<EOF "multigraph zfs_list_$fsname
graph_title $fsname usage
graph_order usedbydataset usedbychildren usedbysnapshots usedbyrefreservation available total quota
graph_args --base 1024 -r -l 0 --vertical-label Bytes --upper-limit ${values[6]}
graph_info This graph shows how a zfs filesystem is used.
graph_category fs
graph_period second
usedbydataset.label UsedByDataset
usedbydataset.draw AREA
usedbydataset.info Used space by Dataset
usedbydataset.colour FF0000
usedbychildren.label UsedByChildren
usedbychildren.draw STACK
usedbychildren.info Used space by children
usedbychildren.colour FFCC33
usedbysnapshots.label UsedBySnapshots
usedbysnapshots.draw STACK
usedbysnapshots.info Used space by snapshot
usedbysnapshots.colour 0000FF
usedbyrefreservation.label Usedbyrefreservation
usedbyrefreservation.draw STACK
usedbyrefreservation.info Used space by Ref Reservation
usedbyrefreservation.colour 33CCFF
available.label Available
available.draw STACK
available.info Free space
available.colour 00FF00
total.label Total
total.draw LINE1
total.info Total
total.colour 000000
quota.label Quota
quota.draw LINE1
quota.info Quota
quota.colour 555555"
EOF
	done
	exit 0
fi

for i in $search_term; do
	values=( $(zfs get -p usedbydataset,usedbychildren,usedbysnapshots,usedbyrefreservation,available,quota $i | awk 'BEGIN {total=0;} { if( NR==1 ) next; } !/quota/ {total=total+$3;} {print $3} END{print total;}') )
	fsname=$(clean_fieldname $(echo "$i" | sed 's/\//__/g'))

	if [ ${values[5]} = "-" ]; then
		quota=0
	else
		quota=${values[5]}
	fi

	echo <<EOF "multigraph zfs_list_$fsname
usedbydataset.value ${values[0]}
usedbysnapshots.value ${values[2]}
usedbychildren.value ${values[1]}
usedbyrefreservation.value ${values[3]}
available.value ${values[4]}
total.value ${values[6]}
quota.value $quota"
EOF
done

exit 0