Estimating Free Flash File Space

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Some Digi products support the standard Python os.statvfs() function to query FLASH filesystem stats. Note that due the realities of file system overhead, allocating a file of size X, then freeing that file may NOT return the free/used statistics to the exact same condition.

Below is an example code which runs on a Digi ConnectPort X4 or Connect SP. 

import os
import traceback
 
try:
    x = os.statvfs("WEB")
    print 'raw', x
    total = x[0] * x[2]
    free = x[0] * x[3]
    used = total - free
    print 'total:%0.2fMB free:%0.2fMB used:%0.2fMB' % \
        (total/1000000.0, free/1000000.0, used/1000000.0)
 
except:
    traceback.print_exc()
    print "perhaps this product does not have YAFFS?"
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