#!/usr/bin/python
# -*- coding: utf-8 -*-
#
# (c) 2014, Richard Isaacson <richard.c.isaacson@gmail.com>
#
# This file is part of Ansible
#
# Ansible 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.
#
# Ansible 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 Ansible. If not, see <http://www.gnu.org/licenses/>.
DOCUMENTATION = '''
---
module: at
short_description: Schedule the execution of a command or scripts via the at command.
description:
- Use this module to schedule a command or script to run once in the future.
- All jobs are executed in the a queue.
version_added: "0.0"
options:
user:
description:
- The user to execute the at command as.
required: false
default: null
command:
description:
- A command to be executed in the future.
required: false
default: null
script_file:
description:
- An existing script to be executed in the future.
required: false
default: null
unit_count:
description:
- The count of units in the future to execute the command or script.
required: true
unit_type:
description:
- The type of units in the future to execute the command or script.
required: true
choices: ["minutes", "hours", "days", "weeks"]
action:
description:
- The action to take for the job defaulting to add. Unique will verify that there is only one entry in the queue.
- Delete will remove all existing queued jobs.
required: true
choices: ["add", "delete", "unique"]
default: add
requirements:
- at
author: Richard Isaacson
'''
EXAMPLES = '''
# Schedule a command to execute in 20 minutes as root.
- at: command="ls -d / > /dev/null" unit_count=20 unit_type="minutes"
# Schedule a script to execute in 1 hour as the neo user.
- at: script_file="/some/script.sh" user="neo" unit_count=1 unit_type="hours"
# Match a command to an existing job and delete the job.
- at: command="ls -d / > /dev/null" action="delete"
# Schedule a command to execute in 20 minutes making sure it is unique in the queue.
- at: command="ls -d / > /dev/null" action="unique" unit_count=20 unit_type="minutes"
'''
import os
import tempfile
def matching_jobs(module, at_cmd, script_file, user=None):
matching_jobs = []
atq_cmd = module.get_bin_path('atq', True)
# Get list of job numbers for the user.
atq_command = "%s" % (atq_cmd)
if user:
atq_command = "su '%s' -c '%s'" % (user, atq_command)
rc, out, err = module.run_command(atq_command)
if rc != 0:
module.fail_json(msg=err)
current_jobs = out.splitlines()
if len(current_jobs) == 0:
return matching_jobs
# Read script_file into a string.
script_file_string = open(script_file).read().strip()
# Loop through the jobs.
# If the script text is contained in a job add job number to list.
for current_job in current_jobs:
split_current_job = current_job.split()
at_command = "%s -c %s" % (at_cmd, split_current_job[0])
if user:
at_command = "su '%s' -c '%s'" % (user, at_command)
rc, out, err = module.run_command(at_command)
if rc != 0:
module.fail_json(msg=err)
if script_file_string in out:
matching_jobs.append(split_current_job[0])
# Return the list.
return matching_jobs
#================================================
def main():
module = AnsibleModule(
argument_spec = dict(
user=dict(required=False),
command=dict(required=False),
script_file=dict(required=False),
unit_count=dict(required=False,
type='int'),
unit_type=dict(required=False,
default=None,
choices=["minutes", "hours", "days", "weeks"],
type="str"),
action=dict(required=False,
default="add",
choices=["add", "delete", "unique"],
type="str")
),
supports_check_mode = False,
)
at_cmd = module.get_bin_path('at', True)
user = module.params['user']
command = module.params['command']
script_file = module.params['script_file']
unit_count = module.params['unit_count']
unit_type = module.params['unit_type']
action = module.params['action']
if ((action == 'add') and (not unit_count or not unit_type)):
module.fail_json(msg="add action requires unit_count and unit_type")
if (not command) and (not script_file):
module.fail_json(msg="command or script_file not specified")
if command and script_file:
module.fail_json(msg="command and script_file are mutually exclusive")
result = {}
result['action'] = action
result['changed'] = False
# If command transform it into a script_file
if command:
filed, script_file = tempfile.mkstemp(prefix='at')
fileh = os.fdopen(filed, 'w')
fileh.write(command)
fileh.close()
# if delete then return
if action == 'delete':
for matching_job in matching_jobs(module, at_cmd, script_file, user):
at_command = "%s -d %s" % (at_cmd, matching_job)
if user:
at_command = "su '%s' -c '%s'" % (user, at_ccommand)
rc, out, err = module.run_command(at_command)
if rc != 0:
module.fail_json(msg=err)
result['changed'] = True
module.exit_json(**result)
# if unique if existing return unchanged
if action == 'unique':
if len(matching_jobs(module, at_cmd, script_file, user)) != 0:
module.exit_json(**result)
result['script_file'] = script_file
result['unit_count'] = unit_count
result['unit_type'] = unit_type
at_command = "%s now + %s %s -f %s" % (at_cmd, unit_count, unit_type, script_file)
if user:
# We expect that if this is an installed the permissions are already correct for the user to execute it.
at_command = "su '%s' -c '%s'" % (user, at_command)
rc, out, err = module.run_command(at_command)
if rc != 0:
module.fail_json(msg=err)
if command:
os.unlink(script_file)
result['changed'] = True
module.exit_json(**result)
# import module snippets
from ansible.module_utils.basic import *
main()