On Nov 24, 11:46 am, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]>
wrote:
> I would like to write a script in Python to email me when disk space
> gets below a certain value.
OK, I'll give you the easy way using your example and popen, and then
a more complex example that doesn't rely on df/grep/awk and uses only
system calls:
Easy way:
import os
# open a pipe to "df ...", read from its stdout,
# strip the trailing \n, split it into a list on
# every \n, and put the results in 'data'
pipe = os.popen("df -x cifs -x iso9660 | " +
"grep --color=never -E '^/dev' | " +
"awk '{print $1, $4}'")
data = pipe.read().strip().split('\n')
pipe.close()
# 'data' now looks like:
# ['/dev/hda1 1405056', '/dev/hda3 152000']
quota = 2097152 # 2GB
# iterate the list, splitting each element
# on ' ', and assigning the first and second
# elements to 'device' and 'free'
for node in data:
device, free = node.split(' ')
if int(free) < quota:
# your mail stuff here
print "Device `%s' has less than %.2f GB free space" % \
(device, quota/1024.0/1024)
More complex way (well, less complex actually, just requires more
knowledge of python/fs):
quota = 2097152 # 2 GB
# map of mount point / device name
device_map = {'/' : '/dev/hda1',
'/mnt/shared' : '/dev/hda3'}
for mount, device in device_map.items():
# statvfs returns tuple of device status,
# see also "man statvfs" which this call wraps
vstat = os.statvfs(mount)
# (block size * free blocks) / 1024 = free bytes
# NB: for large drives, there is a margin of error
# in this naive computation, because it doesn't account
# for things like inode packing by the fs. But for a
# large quota like 2 GB, a +/- hundrend megs margin of
# error should not cause any problem.
free = (vstat[0] * vstat[4]) / 1024
if free < quota:
# your mail stuff here
print "Device `%s' has less than %.2f GB free space" % \
(device, quota/1024.0/1024)
References:
statvfs:
http://www.python.org/doc/lib/os-file-dir.html
http://www.python.org/doc/lib/module-statvfs.html
Regards,
Jordan
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