example for the munki wiki

change_tz-1.0.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>OnDemand</key>
	<true/>
	<key>_metadata</key>
	<dict>
		<key>created_by</key>
		<string>abanks</string>
		<key>creation_date</key>
		<date>2015-11-02T20:19:08Z</date>
		<key>munki_version</key>
		<string>2.3.1.2558</string>
		<key>os_version</key>
		<string>10.11.2</string>
	</dict>
	<key>autoremove</key>
	<false/>
	<key>catalogs</key>
	<array>
		<string>testing</string>
	</array>
	<key>category</key>
	<string>SelfService</string>
	<key>display_name</key>
	<string>Change Timezone</string>
	<key>installer_type</key>
	<string>nopkg</string>
	<key>minimum_os_version</key>
	<string>10.4.0</string>
	<key>name</key>
	<string>change_tz</string>
	<key>preinstall_script</key>
	<string>#!/usr/bin/python
'''Uses a web geoip service and cocoaDialog to allow end users to change
   the time zone on their Mac (assuming they can get on the internet)'''


import json
import subprocess
import sys
import urllib2
from gmacpyutil import cocoadialog


def grab_geoip():
    '''returns probable timezone info via geoip lookup'''
    geoip_checksite = 'http://freegeoip.net/json/'
    response = urllib2.urlopen(geoip_checksite).read()
    if response:
        dict_response = json.loads(response)
        tzone = dict_response.get('time_zone', None)
        return tzone
    else:
        print 'foo'

def change_tzone(region):
    '''heavy lifting to interact w/ sys setup'''
    cmd = ['/usr/sbin/systemsetup', '-settimezone', region]
    result = subprocess.check_call(cmd)
    return result

def get_tzone():
    '''Grab current tz from sys setup'''
    cmd = ['/usr/sbin/systemsetup', '-gettimezone']
    result = subprocess.check_output(cmd)
    return result.strip()[11:]

def cleanup(result):
    '''catch errors with feedback, or show success'''
    if result == 'foo':
        tooold_msg = cocoadialog.MsgBox(title="Sorry!")
        tooold_msg.SetInformativeText("There was an error setting your timezone. Please schedule a time for follow-up with the servicedesk.")
        button_pressed = tooold_msg.Show()
        button = button_pressed.split('\n')[0]
        sys.exit(1)
    elif result == 'already there':
        complete_msg = cocoadialog.MsgBox(title="Pardon")
        complete_msg.SetInformativeText("Your computer already seems to be set to the correct timezone. Please schedule a time for follow-up with the servicedesk if you still need assistance.")
        button_pressed = complete_msg.Show()
        button = button_pressed.split('\n')[0]
        if button:
            sys.exit(0)
    else:
        complete_msg = cocoadialog.MsgBox(title="Complete")
        complete_msg.SetText("Glad to be of assistance!")
        button_pressed = complete_msg.Show()
        button = button_pressed.split('\n')[0]
        if button:
            sys.exit(0)

def main():
    '''gimme some main'''
    region = grab_geoip()
    current_tz = get_tzone()
    if region == current_tz:
        cleanup('already there')
    cd_title = "TimeZone Change Utility"
    welcome_prompt = cocoadialog.MsgBox(title=cd_title)
    welcome_prompt.SetText("We've detected this timezone: " + region)
    welcome_prompt.SetInformativeText("Shall we go ahead and change to that timezone?")
    welcome_prompt.SetButton1('Okay')
    welcome_prompt.SetButton2('Cancel')
    welcome_showed = welcome_prompt.Show()
    button, __ = welcome_showed.split('\n')[:2]
    if button == 'Okay':
        exit_code = change_tzone(region)
        if exit_code != 0:
            cleanup('foo')
        else:
            cleanup('success')

if __name__ == '__main__':
    main()
</string>
	<key>version</key>
	<string>1.0</string>
</dict>
</plist>