mon monitor plugin to free blocks/i-node on block devices

pyfreespace.monitor.py

#!/usr/bin/env python

from __future__ import with_statement
import logging
import optparse
import os
import sys

def main(args):
    parser = optparse.OptionParser("usage %prog [OPTIONS]", add_help_option=False)
    parser.add_option('--help', action='help', help='show this message and exit')
    parser.add_option('-g', '--greater-than', '--should-be-greater-than', type='int', default=None, dest='gt', help='threshold')
    parser.add_option('-l', '--less-than', '--should-be-less-than', type='int', default=None, dest='lt', help='threshold')
    parser.add_option('-d', '--directory', default=[], action='append', dest='directories', help='directory')
    parser.add_option('-v', '--verbose', default=False, action='store_true', dest='verbose', help='show verbose messages')
    (options, args) = parser.parse_args(args)

    if options.verbose:
        logging.basicConfig(level=logging.DEBUG)

    directories = options.directories if 0 < len(options.directories) else [ '/' ]

    f = 0
    for fs_file in directories:
        r = os.statvfs(fs_file)
        block_usage_pct = round(100.0 - (float(r.f_bavail) / float(r.f_blocks) * 100))
        inode_usage_pct = round(100.0 - (float(r.f_favail) / float(r.f_files) * 100))

        logging.debug("%s: block_usage_pct => %d, inode_usage_pct => %d" % (fs_file, block_usage_pct, inode_usage_pct))

        if options.lt:
            if options.lt < block_usage_pct:
                logging.error("Block usage on %s is too big. (%d%% used)" % (fs_file, block_usage_pct))
                f += 1
            if options.lt < inode_usage_pct:
                logging.error("i-node usage on %s is too big. (%d%% used)" % (fs_file, inode_usage_pct))
                f += 1

        if options.gt:
            if block_usage_pct <= options.gt:
                logging.error("Block usage on %s is too small. (%d%% used)" % (fs_file, block_usage_pct))
                f += 1
            if inode_usage_pct <= options.gt:
                logging.error("i-node usage on %s is too small. (%d%% used)" % (fs_file, inode_usage_pct))
                f += 1

    sys.exit(0 if f == 0 else 1)

if __name__ == "__main__":
    main(sys.argv)

# vim:set ft=python :