Crontab jobs management in Python

I'm trying to use the Plan to add cron commands at Django site startup. When I use 'update' mode my Django server go down, because 'update' command send sys.exit(1) signal. I fix that by this code, but I think it's ugly:

# Don't exit on success
try:
    cron.run("update")
except SystemExit:
    pass

Brilliant module, congrats!

It would be extra awesome if it could be combined with, for instance, @ansible:

https://github.com/ansible/ansible

Often sysadmins have several machines running cron and they forget what is running on which, causing race conditions on services that rely on different states and dependencies.

Having both composable crontab modules and a global view of how crontabs look like across machines would be quite awesome feature.

Have you checked Chronos, for instance?:

http://airbnb.github.io/chronos/

Add mailto:

cron = Plan('cron', mailto=['[email protected]', '[email protected]'])

it will generate code below:

# Begin Plan generated jobs for: zhihu
# jobs will send mail to users below
[email protected],[email protected]

Only support named cron.

For this project, I don't see why the Python 3 page (http://plan.readthedocs.org/python3.html) needs to recommend Python 2. It supports Python 3 and only depends on click, which also supports Python 3.

It's also very well possible to schedule your cron using Python 3 but have the application be in Python 2 (if necessary). The far majority of packages now support Python 3 (http://python3wos.appspot.com/) so the decision should be left to the user.

weekday refers to Monday through Friday. We often say:

• The library open 9AM to 10PM on weekdays
• Monday is a weekday

So in my opinion weekdays is better than weekday, when it means "any day between Monday and Friday".

The same argue may stand for weekend and weekends.

I'm not a native English speaker so I might be wrong, but supporting the plural form seems to be harmless.

There are small typos in:

• docs/job_definition.rst
• docs/run_types.rst
• plan/job.py

Fixes:

• Should read separate rather than seperate.
• Should read insensitive rather than insenstive.
• Should read should rather than shoud.
• Should read separated rather than seperated.

Semi-automated pull request generated by https://github.com/timgates42/meticulous/blob/master/docs/NOTE.md

File "/Users/chenzhang/PycharmProjects/threatbook_spider/visual_spider_web/views/slave_views.py", line 74, in make_cron_tasks cron.run('update') File "/Users/chenzhang/envs/threatbook_spider/lib/python3.6/site-packages/plan/core.py", line 278, in run self.update_crontab(run_type) File "/Users/chenzhang/envs/threatbook_spider/lib/python3.6/site-packages/plan/core.py", line 221, in update_crontab current_crontab = self.read_crontab() File "/Users/chenzhang/envs/threatbook_spider/lib/python3.6/site-packages/plan/core.py", line 202, in read_crontab r = communicate_process(command, universal_newlines=True) File "/Users/chenzhang/envs/threatbook_spider/lib/python3.6/site-packages/plan/utils.py", line 22, in communicate_process output, error = p.communicate(stdin) File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/subprocess.py", line 843, in communicate stdout, stderr = self._communicate(input, endtime, timeout) File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/subprocess.py", line 1554, in _communicate self.stdout.errors) File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/subprocess.py", line 740, in _translate_newlines data = data.decode(encoding, errors) UnicodeDecodeError: 'ascii' codec can't decode byte 0xe6 in position 60898: ordinal not in range(128)