Add 'tarsnap' plugin.

Monitors the amount of data stored by the local machine on the tarsnap.com service.

plugins/tarsnap/README.md

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+Munin plugin for Tarsnap
+========================
+
+https://github.com/warrenguy/munin-tarsnap
+
+This plugin creates two graphs:
+
+* *tarsnap_total* - summarising the total amount of data the local tarsnap
+instance has stored on the service (total and compressed).
+* *tarsnap_unique* - summarising the total amount of unique (deduplicated)
+data the local tarsnap instance has stored on the service (total and 
+compressed). The compressed value here is the actual amount of data stored
+on the tarnap servers and what tarsnap uses for billing.
+
+Usage
+-----
+
+Add the following to your backup script (after tarsnap has run), or to a 
+cron job:
+
+    /usr/local/bin/tarsnap --print-stats > /path/to/tarsnap-stats.txt
+ 
+N.B.: ensure `/path/to/munin-stats.txt` is readable by munin-node.
+
+Configuration
+-------------
+
+Define the path to the stats file created above in your munin-node
+configuration:
+
+    [tarsnap]
+    env.STATSFILE /path/to/tarsnap-stats.txt
+
+The default value is `/var/lib/munin/tarsnap-stats.txt`.
+
+Author
+------
+
+Warren Guy <warren@guy.net.au>
+
+https://warrenguy.me
+
+Copyright
+---------
+
+Copyright (C) 2014 Warren Guy <warren@guy.net.au>

plugins/tarsnap/tarsnap

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+#!/bin/sh
+#
+# Munin plugin for Tarsnap
+#
+# https://github.com/warrenguy/munin-tarsnap
+# 
+# USAGE:
+#
+#   Add the following to your backup script (after tarsnap has run), or to a
+#   cron job:
+#
+#     /usr/local/bin/tarsnap --print-stats > /path/to/tarsnap-stats.txt
+#  
+#   N.B.: ensure /path/to/munin-stats.txt is readable by munin-node. The
+#   default path this script tries is /var/lib/munin/tarsnap-stats.txt
+#
+# CONFIGURATION:
+#
+#   [tarsnap]
+#   env.STATSFILE /path/to/tarsnap-stats.txt
+#
+# AUTHOR:
+#
+#   Warren Guy <warren@guy.net.au>
+#   https://warrenguy.me
+#
+# COPYRIGHT:
+#
+#   Copyright (C) 2014 Warren Guy <warren@guy.net.au>
+#
+
+STATSFILE=${STATSFILE=/var/lib/munin/tarsnap-stats.txt}
+
+case $1 in
+  config)
+    cat <<'EOM'
+multigraph tarsnap_total
+graph_title Tarsnap total data
+graph_vlabel bytes
+graph_category tarsnap
+total_size.label Total size
+total_compressed.label Total size (compressed)
+
+multigraph tarsnap_unique
+graph_title Tarsnap unique data
+graph_vlabel bytes
+graph_category tarsnap
+unique_size.label Unique data
+unique_compressed.label Unique data (compressed)
+EOM
+    exit 0;;
+esac
+
+NUMBERS=`cat $STATSFILE | sed -e 's/[a-zA-Z\(\)]//g' -e 's/\ /\n/g' |grep -v ^$`
+LINE=0
+for NUMBER in $NUMBERS; do
+  LINE=`expr $LINE + 1`
+  case "$LINE" in
+    1)  TOTALSIZE=$NUMBER ;;
+    2)  TOTALCOMP=$NUMBER ;;
+    3)  UNIQUESIZE=$NUMBER ;;
+    4)  UNIQUECOMP=$NUMBER ;;
+  esac
+done
+
+printf "multigraph tarsnap_total\ntotal_size.value %s\ntotal_compressed.value %s\n\n" $TOTALSIZE $TOTALCOMP
+printf "multigraph tarsnap_unique\nunique_size.value %s\nunique_compressed.value %s\n" $UNIQUESIZE $UNIQUECOMP