vacation-updater.py

#!/usr/bin/python

import os
import json
import subprocess

def main():
    BASEPATH = "/home/mythmon/code/better-vacation"
    USERPATH = os.path.join(BASEPATH, "users")

    HOMEPATH = "/home"

    for root, dirs, files in os.walk(USERPATH):
        for name in files:
            # Only parse JSON files
            if name[-4:] != 'json':
                continue

            # Read the JSON file.
            try:
                json_path = os.path.join(root, name)
                json_file = open(json_path)
                json_data = json.load(json_file)
            finally:
                json_file.close()

            # Update the message file, but only if the json was modifed since
            # the last time the message has been updated.
            message_path = os.path.join(HOMEPATH, json_data['user'], '.vacation.msg')
            try:
                mtime_message = os.stat(message_path).st_mtime
            except OSError:
                # file doesn't exist, create it.
                mtime_message = -1

            try:
                mtime_json = os.stat(json_path).st_mtime
            except OSError:
                print("JSON File '{0}' mysteriously vanished. Skipping...".format(name))

            if mtime_json > mtime_message:
                try:
                    message_file = open(message_path, 'w')
                    message_file.write(json_data['message'])
                finally:
                    message_file.close()

            if json_data['prev'] == 'off' and json_data['cur'] == 'on':
                # Turn vacation responder on
                p = subprocess.Popen(['su', '-c', '/usb/bin/vacation -I', json_data['user'])

            elif json_data['prev'] == 'on' and json_data['cur'] == 'off':
                # Turn vacation responder off
                # delete the .db file
                db_path = os.path.join(HOMEPATH, json_data['user'], '.vacation.db')
                try:
                    os.remove(db_path)
                except:
                    pass

if __name__ == '__main__':
    main()