munin/tahoe_disktotal: new plugin to show total disk space (used and unused) in the grid

misc/munin/tahoe_disktotal

@@ -0,0 +1,22 @@
+#!/usr/bin/env python
+
+# This is a munin plugin which pulls data from the server in
+# misc/spacetime/diskwatcher.tac . It produces a graph of how much space is
+# present on all disks across the grid. The plugin should be configured with
+# env_url= pointing at the diskwatcher.tac webport.
+
+import os, sys, urllib, simplejson
+
+if len(sys.argv) > 1 and sys.argv[1] == "config":
+    print """\
+graph_title Tahoe Total Disk Space
+graph_vlabel bytes
+graph_category tahoe
+graph_info This graph shows the total amount of disk space present in the grid
+disk_total.label disk total
+disk_total.draw LINE1"""
+    sys.exit(0)
+
+url = os.environ["url"]
+data = simplejson.load(urllib.urlopen(url))["total"]
+print "disk_total.value", data