Greyhole_Freespace_Notifier

#    Copyright 2014 Matt Lovett

#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation, either version 3 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
    
    

import urllib
import urlparse
import os
import urllib2
import subprocess
import json

app_token = 'abc123def456'  #Create a pushover app for this script (https://pushover.net/apps/build)
user_token = 'q1w2e3r4t5y6  #Your pushover user key goes here, you need a pushover account (https://pushover.net)


class PushoverError(Exception): pass

def pushover(**kwargs):
    PUSHOVER_API = "https://api.pushover.net/1/"
    assert 'message' in kwargs

    if not 'token' in kwargs:
        kwargs['token'] = os.environ['PUSHOVER_TOKEN']
    if not 'user' in kwargs:
        kwargs['user'] = os.environ['PUSHOVER_USER']

    url = urlparse.urljoin(PUSHOVER_API, "messages.json")
    data = urllib.urlencode(kwargs)
    req = urllib2.Request(url, data)
    try:
        response = urllib2.urlopen(req)
        output = response.read()
        data = json.loads(output)
    except urllib2.HTTPError, httperror:

        raise PushoverError(httperror)

    if data['status'] != 1:
        raise PushoverError(output)

try:
    greyJSON = subprocess.check_output(["/usr/bin/greyhole" , "-s" , "-j"])
    decoded_data = json.loads(greyJSON)
    for drive, stats in decoded_data.items():
        if drive == 'Total':
            for type, value in stats.items():
                if type == 'potential_available_space':
                    PAS = value/1048576
                elif type == 'total_space':
                    TS = value/1048576
                elif type == 'used_space':
                    US = value/1048576
                elif type == 'free_space':
                    FS = value/1048576
            FSpercent=( float(FS) / float(TS)) * 100
            FSpercent=round(FSpercent,2)
            pushover(message='Greyhole has ' + str(FSpercent) + '% freespace available.\n' +
                     '( ' + str(FS) + 'GB of ' + str(TS) + 'GB )\n' + str(PAS) + 'GB potential free space'
                     , token=app_token, user=user_token)

except subprocess.CalledProcessError, errMSG:
    print(errMSG.output)
except OSError as errMSG:
    print(errMSG)

This script was written with Python 2.7 in mind, YMMV on different versions. I add it to cron.daily to get a daily report but you can add it to cron however suits you.