Munin contributed plugins

#!/bin/bash

#%# family=auto

: << EOF

=head1 NAME

zfs_pool_dataset_count - Outputs the count of zfs pools, datasets and snapshots.

=head1 AUTHOR

Michael Grote

=head1 LICENSE

GPLv3 or later

SPDX-License-Identifier: GPL-3.0-or-later

=head1 MAGIC MARKERS

 #%# family=auto

=cut

EOF

if [ "$1" = "autoconf" ]; then

    if ! command -v zpool &> /dev/null; then

        echo "no (zpool could not be found)"

    else

        echo "yes"

    fi

    exit 0

fi

# lese alle pools, sed löscht die erste zeile

list_pools=$(zpool list | sed 1d)

if [ "$1" = "config" ]; then

  # https://superuser.com/questions/284187/bash-iterating-over-lines-in-a-variable

  while read -r line; do

    # setze label <pool>.label <pool> snapshots

    echo "$line" | awk '{print $1"_snapshot.label " $1 " snapshots"}'

    echo "$line" | awk '{print $1"_dataset.label " $1 " datasets"}'

  done <<< "$list_pools"

  echo 'pools.label pools'

  # setze optionen

  echo 'graph_title zfs -  pool, dataset and snapshot count' # Titelzeile

  echo 'graph_vlabel count' # Text links, hochkant

  echo 'graph_category fs' # Kategorie

  echo 'graph_args -l 0' # wertebegrenzer 0-100

  exit 0

fi

# lese jede Zeile der Variable $list

# tue für jede Zeile

# "echo" die Zeile, wende awk drauf, Spalte $1/$7

while read -r line; do

  echo pools.value "$(zpool list | sed 1d | wc -l)"

  # setze poolnamen

  poolname=$(echo "$line" | awk '{ print $1 }')

  # zähle snapshots

  echo "${poolname}_snapshot.value" "$(zfs list -r -t snapshot "$poolname" | sed 1d | wc -l)"

  echo "$poolname""_dataset.value" "$(zfs list -r "$poolname" | sed 1d | wc -l)"

done <<< "$list_pools"

exit 0