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Cron module upgrades

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- added cron_file attribute: if specified, the file with appropriate
job is created in /etc/cron.d directory. Also, you can store multiple
jobs in one file. state='absent' attribute is handled in the following
way in this case: if after the deletion of the job from the file specified
by cron_file variable the file is empty, the file is deleted, otherwise
not.
  - fixed the behaviour, when the backupfile is saved forever in /tmp
folder, even if the backup= atribute is not set (os.unlink() is called if
backup is not True).
  - added some comments to the unobvious places
This commit is contained in:
Mike Grozak 2013-02-08 09:02:44 +01:00 committed by Michael DeHaan
parent 860712e5b3
commit 53892b8fd1
1 changed files with 90 additions and 24 deletions
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114
cron
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@ -2,6 +2,7 @@
# -*- coding: utf-8 -*-
#
# (c) 2012, Dane Summers <dsummers@pinedesk.biz>
# (c) 2013, Mike Grozak <mike.grozak@gmail.com>
#
# This file is part of Ansible
#
@ -58,9 +59,18 @@ options:
state:
description:
- Whether to ensure the job is present or absent.
- If the cron_file setting is specified and the state is 'absent', if after the deletion
of the job the file is empty, the file is deleted
required: false
default: present
aliases: []
cron_file:
descrition:
- The file with appropriate job is created in /etc/cron.d directory. Also, you can store
multiple jobs in one file.
required: fasle
default:
aliases: []
backup:
description:
- If set, then create a backup of the crontab before it is modified.
@ -114,20 +124,30 @@ examples:
description: 'Ensure an old job is no longer present. Removes any job that is preceded by "#Ansible: an old job" in the crontab'
- code: 'cron: name="a job for reboot" reboot=True job="/some/job.sh"'
description: 'Creates an entry like "@reboot /some/job.sh"'
- code: 'cron: name="yum autoupdate" weekday="2" minute=0 hour=12 user="root" job="YUMINTERACTIVE=0 /usr/sbin/yum-autoupdate" cron_file=ansible_yum-autoupdate
requirements: cron
author: Dane Summers
updates: Mike Grozak
'''
import re
import tempfile
def get_jobs_file(module, user, tmpfile):
cmd = "crontab -l %s > %s" % (user,tmpfile)
def get_jobs_file(module, user, tmpfile, cron_file):
if cron_file:
cmd = "cp -fp /etc/cron.d/%s %s" % (cron_file, tmpfile)
else:
cmd = "crontab -l %s > %s" % (user,tmpfile)
return module.run_command(cmd)
def install_jobs(module, user, tmpfile):
cmd = "crontab %s %s" % (user,tmpfile)
def install_jobs(module, user, tmpfile, cron_file):
if cron_file:
cmd = "ln -f %s /etc/cron.d/%s" % (tmpfile, cron_file)
else:
cmd = "crontab %s %s" % (user, tmpfile)
return module.run_command(cmd)
def get_jobs(tmpfile):
@ -166,6 +186,10 @@ def remove_job(name,tmpfile):
def do_remove_job(lines,comment,job):
return None
def remove_job_file(cron_file):
fname = "/etc/cron.d/%s" % (cron_file)
os.unlink(fname)
def _update_job(name,job,tmpfile,addlinesfunction):
ansiblename="#Ansible: %s" % (name)
f = open(tmpfile)
@ -186,7 +210,25 @@ def _update_job(name,job,tmpfile,addlinesfunction):
f.write(l)
f.write('\n')
f.close()
return (0,"","") # TODO add some more error testing
if len(newlines) == 0:
return (0,"","",True)
else:
return (0,"","",False) # TODO add some more error testing
def get_cron_job(minute,hour,day,month,weekday,job,user,cron_file,reboot):
if reboot:
if cron_file:
return "@reboot %s %s" % (user, job)
else:
return "@reboot %s" % (job)
else:
if cron_file:
return "%s %s %s %s %s %s %s" % (minute,hour,day,month,weekday,user,job)
else:
return "%s %s %s %s %s %s" % (minute,hour,day,month,weekday,job)
return None
def main():
# The following example playbooks:
@ -217,6 +259,7 @@ def main():
name=dict(required=True),
user=dict(required=False),
job=dict(required=False),
cron_file=dict(required=False),
state=dict(default='present', choices=['present', 'absent']),
backup=dict(default=False, choices=BOOLEANS),
minute=dict(default='*'),
@ -232,40 +275,45 @@ def main():
name = module.params['name']
user = module.params['user']
job = module.params['job']
cron_file = module.params['cron_file']
minute = module.params['minute']
hour = module.params['hour']
day = module.params['day']
month = module.params['month']
weekday = module.params['weekday']
reboot = module.boolean(module.params.get('reboot', False))
state = module.params['state']
do_install = module.params['state'] == 'present'
changed = False
if reboot and (True in [(x != '*') for x in [minute, hour, day, month, weekday]]):
module.fail_json(msg="You must specify either reboot=True or any of minute, hour, day, month, weekday")
if reboot:
job = "@reboot %s" % (job)
if cron_file:
if not user:
module.fail_json(msg="To use file=... parameter you must specify user=... as well")
else:
job = "%s %s %s %s %s %s" % (minute,hour,day,month,weekday,job)
if not user:
user = ""
else:
user = "-u %s" % (user)
rc, out, err, status = (0, None, None, None)
if not user:
user = ""
else:
user = "-u %s" % (user)
job = get_cron_job(minute,hour,day,month,weekday,job,user,cron_file,reboot)
rc, out, err, rm, status = (0, None, None, None, None)
if job is None and do_install:
module.fail_json(msg="You must specify 'job' to install a new cron job")
tmpfile = tempfile.NamedTemporaryFile()
(rc, out, err) = get_jobs_file(module,user,tmpfile.name)
(rc, out, err) = get_jobs_file(module,user,tmpfile.name, cron_file)
if rc != 0 and rc != 1: # 1 can mean that there are no jobs.
module.fail_json(msg=err)
(handle,backupfile) = tempfile.mkstemp(prefix='crontab')
(rc, out, err) = get_jobs_file(module,user,backupfile)
(rc, out, err) = get_jobs_file(module,user,backupfile, cron_file)
if rc != 0 and rc != 1:
module.fail_json(msg=err)
old_job = find_job(name,backupfile)
if do_install:
if len(old_job) == 0:
@ -276,27 +324,45 @@ def main():
changed = True
else:
if len(old_job) > 0:
(rc, out, err) = remove_job(name,tmpfile.name)
# if rm is true after the next line, file will be deleted afterwards
(rc, out, err, rm) = remove_job(name,tmpfile.name)
changed = True
else:
# there is no old_jobs for deletion - we should leave everything
# as is. If the file is empty, it will be removed later
tmpfile.close()
# the file created by mks should be deleted explicitly
os.unlink(backupfile)
module.exit_json(changed=changed,cron_file=cron_file,state=state)
if (rc != 0):
module.fail_json(msg=err)
if changed:
if backup:
module.backup_local(backupfile)
(rc, out, err) = install_jobs(module,user,tmpfile.name)
if (rc != 0):
module.fail_json(msg=err)
if changed:
# If the file is empty - remove it
if rm:
remove_job_file(cron_file)
else:
if backup:
module.backup_local(backupfile)
(rc, out, err) = install_jobs(module,user,tmpfile.name, cron_file)
if (rc != 0):
module.fail_json(msg=err)
# get the list of jobs in file
jobnames = []
for j in get_jobs(tmpfile.name):
jobnames.append(j[0])
tmpfile.close()
if not backup:
os.unlink(backupfile)
module.exit_json(changed=changed,jobs=jobnames)
else:
module.exit_json(changed=changed,jobs=jobnames,backup=backupfile)
# include magic from lib/ansible/module_common.py
#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
main()