Added grain for osdisk stats

grains/osdisk.py

@@ -0,0 +1,31 @@
+#!/usr/bin/env python
+import os  
+
+def get_osdisk_stats():
+"""
+	Calculates and resturns the disk used, available and total capacity
+	in gigabytes. Calculations code from:
+	http://www.stealthcopter.com/blog/2009/09/python-diskspace/
+"""
+	grains = {}
+	grains['osdisk'] = {}
+	disk = os.statvfs("/")  
+
+	capacity = disk.f_bsize * disk.f_blocks  
+	available = disk.f_bsize * disk.f_bavail  
+	used = disk.f_bsize * (disk.f_blocks - disk.f_bavail)   
+
+	# print information in bytes  
+	#print used, available, capacity  
+	# print information in Kilobytes  
+	#print used/1024, available/1024, capacity/1024  
+	# print information in Megabytes  
+	#print used/1.048576e6, available/1.048576e6, capacity/1.048576e6  
+	# print information in Gigabytes  
+	#print used/1.073741824e9, available/1.073741824e9, capacity/1.073741824e9 
+
+	grains['osdisk']['used'] = int(round(used/1.073741824e9))
+	grains['osdisk']['available'] = int(round(available/1.073741824e9))
+	grains['osdisk']['capacity'] = int(round(capacity/1.073741824e9))
+
+	return grains