Add reboot action plugin (#35205)

* Update docs

* Add reboot action plugin

Refactor win_reboot so it is subclassed from reboot

* Use new connection methods

* Test fixes

* Use better uptime command for Linux

Use who -b to get the last time the system was booted rather than uptime, which changes every second.

* Use distribution specefic commands and flags

Query the managed node to determien its distribution, then set the appropriate command and flags.

* Tune debug messages a bit

* Update module docs with details about pre_reboot_delay

s docs

* Ensure that post_reboot_delay is a positive number

* Remove the stringification

* Add integration tests

* Make sure aliases are honored

* Handle systems that have an incorrect last boot time

SystemD and fakehw-clock do not properly set the
last boot time and instead always set it to epoch.
Use a different command if that is the case.

* Copyright and encoding fixes

* Minor fixes based on feedback

* Add exponential backoff to sucess check method

* Update integration test

Skip the integration test if it would try to reboot the control node. We need a new mechanism to account for this scenario in ansible-test, so tests must currently be run manually for this plugin.

* Update integration test

Skip the integration test if it would try to reboot the control node. We need a new mechanism to account for this scenario in ansible-test, so tests must currently be run manually for this plugin.

* Fail early with running with local connection

* Update docs based on feedback

* minor refactoring, state mgmt changes

lib/ansible/modules/system/reboot.py

@@ -0,0 +1,81 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+# Copyright: (c) 2018, Ansible Project
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+
+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
+ANSIBLE_METADATA = {'metadata_version': '1.1',
+                    'status': ['preview'],
+                    'supported_by': 'core'}
+
+DOCUMENTATION = r'''
+module: reboot
+short_description: Reboot a machine
+description:
+     - Reboot a machine, wait for it to go down, come back up, and respond to commands.
+version_added: "2.7"
+options:
+  pre_reboot_delay:
+    description:
+      - Seconds for shutdown to wait before requesting reboot.
+      - On Linux and macOS, this is converted to minutes and rounded down. If less than 60, it will be set to 0.
+      - On Solaris and FreeBSD, this will be seconds.
+    default: 0
+    type: int
+  post_reboot_delay:
+    description:
+      - Seconds to wait after the reboot was successful and the connection was re-established.
+      - This is useful if you want wait for something to settle despite your connection already working.
+    default: 0
+    type: int
+  reboot_timeout:
+    description:
+      - Maximum seconds to wait for machine to reboot and respond to a test command.
+      - This timeout is evaluated separately for both network connection and test command success so the
+        maximum execution time for the module is twice this amount.
+    default: 600
+    type: int
+  connect_timeout:
+    description:
+      - Maximum seconds to wait for a successful connection to the managed hosts before trying again.
+      - If unspecified, the default setting for the underlying connection plugin is used.
+    type: int
+  test_command:
+    description:
+      - Command to run on the rebooted host and expect success from to determine the machine is ready for
+        further tasks.
+    default: whoami
+    type: str
+  msg:
+    description:
+      - Message to display to users before reboot.
+    default: Reboot initiated by Ansible
+    type: str
+author:
+    - Matt Davis (@nitzmahone)
+    - Sam Doran (@samdoran)
+'''
+
+EXAMPLES = r'''
+# Unconditionally reboot the machine with all defaults
+- reboot:
+
+# Reboot a slow machine that might have lots of updates to apply
+- reboot:
+    reboot_timeout: 3600
+'''
+
+RETURN = r'''
+rebooted:
+  description: true if the machine was rebooted
+  returned: always
+  type: boolean
+  sample: true
+elapsed:
+  description: The number of seconds that elapsed waiting for the system to be rebooted.
+  returned: always
+  type: int
+  sample: 23
+'''