#!/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