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

: << EOF
=head1 NAME

zpool_fragmentation - Outputs the zpool fragmentation per zfs pool.

=head1 AUTHOR

Michael Grote - git.mgrote.net

=head1 LICENSE

GPLv3 or later

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

=head1 MAGIC MARKERS

  #%# family=auto
  #%# capabilities=autoconf

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
# entferne das %-zeichen
list=$(zpool list | sed 1d | tr -d %)


if [ "$1" = "config" ]; then
  # https://superuser.com/questions/284187/bash-iterating-over-lines-in-a-variable
  while read -r line; do
    # setze label
    echo "$line" | awk '{print $1".label " $1}'
    # setze warn-limits
    echo "$line" | awk '{print $1".warning " 50}'
    echo "$line" | awk '{print $1".critical " 75}'
  done <<< "$list"
  # setze optionen
  echo 'graph_title ZFS storage pool - fragmentation' # Titelzeile
  echo 'graph_vlabel fragmentation in %' # Text links, hochkant
  echo 'graph_category fs' # Kategorie
  echo 'graph_info This graph shows the ZFS Pool fragmentation.' # Text über Tabelle/Infos
  echo 'graph_args -l 0 --upper-limit 100' # wertebegrenzer 0-100
  exit 0
fi

# lese jede Zeile der Variable $list
# tue für jede Zeile
# "echo" die Zeile, wende awk drauf, Spalte $1/$7
while read -r line; do
  # gebe wert aus
  # <name>.value <wert>
  echo "$line" | awk '{print $1".value " $7}'
done <<< "$list"
exit 0