#!/bin/sh

: << =cut

=encoding utf8

=head1 NAME

df - Script to monitor disk usage

=head1 APPLICABLE SYSTEMS

Cygwin 1.7.x or higher systems with coreutils installed.

=head1 USAGE

Link this plugin to /etc/munin/plugins/ and restart the munin-node.

The plugin excludes per default the following special, read-only or
dynamically allocating file systems from graphing:

  iso9660

=head1 CONFIGURATION

The following environment variables are used by this plugin:

 warning  - Warning percentage (Default: 92)
 critical - Critical percentage (Default: 98)

=head1 BUGS/TODO

Check smb/cifs remote mounts. (Cygwin bug, 2002 vintage, still unfixed: -l switch to df is reversed.)

=head1 AUTHOR

Erik Inge Bolsø <knan-munin@anduin.net>

=head1 LICENSE

GPLv2

=head1 MAGIC MARKERS

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

=cut

. "$MUNIN_LIBDIR/plugins/plugin.sh"

print_values () {
    df -P -x iso9660 2>/dev/null | sed -e 1d -e '/\/\//d' -e 's/%//' |
    while read -r dev size used free pct fs; do
        echo "$(clean_fieldname "$dev").value $pct"
    done
}


if [ "$1" = "autoconf" ]; then
    if [ -z "$(print_values)" ] ; then
	echo no
    else
	echo yes
    fi
    exit 0
fi

if [ "$1" = "config" ]; then
    echo 'graph_title Disk usage in percent'
    echo 'graph_args --upper-limit 100 -l 0'
    echo 'graph_vlabel %'
    echo 'graph_scale no'
    echo 'graph_category disk'
    # shellcheck disable=SC2034
    df -P -x iso9660 | sed -e 1d -e '/\/\//d' -e 's/%//' | sort \
            | while read -r dev size used free pct fs; do
        name=$(clean_fieldname "$dev")
        echo "$name.label $fs"
        print_warning "$name"
        print_critical "$name"
    done
    exit 0
fi

print_values