#!/bin/bash

: << =cut

=head1 NAME

deborphan - Monitor orphaned Debian packages

=head1 APPLICABLE SYSTEMS

Debian-ish systems with deborphan installed.

=head1 CONFIGURATION

None needed.

=head1 AUTHOR

Olivier Mehani <shtrom+munin@ssji.net>
Based on the debsecan plugin by Nicolas Bouthors. 2016-09-02

=head1 LICENSE

GPLv2

=head1 MAGIC MARKERS

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

=cut

# Auto enable if we have deborphan only
if [ "$1" = "autoconf" ] ; then
  if which deborphan >/dev/null; then
    echo yes
  else
    echo "no (deborphan is missing)"
  fi
  exit 0
fi

# Fail if we don't have deborphan
if ! which deborphan >/dev/null; then
  echo "deborphan is missing" >&2
  exit 1
fi

OUT=$(mktemp -t munin-deborphan.XXXXXX)
TMPFILES=$OUT
trap 'rm -f $TMPFILES' EXIT
deborphan --show-section --guess-all | sed 's/\//_/' | sort > "${OUT}"

CATEGORIES="$(awk '{print $1}' "${OUT}" | uniq)"

if [ "$1" = "config" ]; then
  cat <<EOF
graph_title Orphaned packages
graph_args -l 0 --base 1000
graph_vlabel number of packages
graph_category system
graph_period second
graph_info This graph show the number of orphaned packages on your system. Use deborphan to see details.
EOF
  for cat in ${CATEGORIES}; do
    cat <<EOF
${cat}.label ${cat/_/\/}
${cat}.type GAUGE
${cat}.draw AREASTACK
${cat}.min 0
${cat}.info The number of orphaned packages in ${cat/_/\/}
EOF
  done

else
  for cat in ${CATEGORIES}; do
    TMP=$(mktemp -t munin-deborphan.XXXXXX)
    TMPFILES="${TMPFILES} $TMP"
    sed -n "s/${cat} \+//p" "${OUT}" > "${TMP}"
    echo "${cat}.value $(wc -l < "${TMP}")"
    # shellcheck disable=SC2005 disable=SC2046
    # echo is not useless here: we want everything on one line
    echo "${cat}.extinfo $(echo $(cat "${TMP}"))"
  done
fi