Browse Source

mqtt message on topic systemctl/hostname/poweroff schedules poweroff with delay of 4 seconds

Fabian Peter Hammerle 3 years ago
commit
1574063886
15 changed files with 1821 additions and 0 deletions
  1. 52 0
      .github/workflows/python.yml
  2. 4 0
      .gitignore
  3. 6 0
      .pylintrc
  4. 12 0
      CHANGELOG.md
  5. 674 0
      COPYING
  6. 18 0
      Pipfile
  7. 354 0
      Pipfile.lock
  8. 54 0
      README.md
  9. 2 0
      mypy.ini
  10. 68 0
      setup.py
  11. 180 0
      systemctl_mqtt/__init__.py
  12. 169 0
      tests/test_cli.py
  13. 57 0
      tests/test_dbus.py
  14. 152 0
      tests/test_mqtt.py
  15. 19 0
      tests/test_settings.py

+ 52 - 0
.github/workflows/python.yml

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+# sync with https://github.com/fphammerle/ical2vdir/blob/master/.github/workflows/python.yml
+
+# shown in badge
+# https://help.github.com/en/actions/automating-your-workflow-with-github-actions/configuring-a-workflow#adding-a-workflow-status-badge-to-your-repository
+name: tests
+
+on:
+  push:
+  pull_request:
+  schedule:
+  - cron: '0 20 * * 5'
+
+jobs:
+  build:
+    runs-on: ubuntu-18.04
+    strategy:
+      matrix:
+        python-version:
+        - 3.5
+        - 3.6
+        - 3.7
+        - 3.8
+    steps:
+    - uses: actions/checkout@v1
+    - uses: actions/setup-python@v1
+      with:
+        python-version: ${{ matrix.python-version }}
+    - run: pip install --upgrade pipenv>=2018.10.9
+    - run: pipenv install --deploy --dev
+    # ModuleNotFoundError: No module named 'importlib_metadata'
+    # https://github.com/WanzenBug/pylint-import-requirements/issues/17
+    - run: if python3 -c 'import sys; sys.exit(sys.version_info < (3, 8))'; then
+           pipenv graph;
+           pipenv install --dev importlib-metadata;
+           fi
+    - run: pipenv graph
+    - run: pipenv run pylint --load-plugins=pylint_import_requirements systemctl_mqtt
+    # https://github.com/PyCQA/pylint/issues/352
+    - run: pipenv run pylint tests/*
+    - run: pipenv run mypy systemctl_mqtt tests
+    - run: pipenv run pytest --cov=systemctl_mqtt --cov-report=term-missing --cov-fail-under=100
+    - run: pipenv run black --check .
+    # >=1.9.0 to detect branch name
+    # https://github.com/coveralls-clients/coveralls-python/pull/207
+    # https://github.com/coverallsapp/github-action/issues/4#issuecomment-547036866
+    # 1.11.0 https://github.com/coveralls-clients/coveralls-python/issues/219
+    - run: pip install 'coveralls>=1.9.0,<2,!=1.11.0'
+    # https://github.com/coverallsapp/github-action/issues/30
+    # https://github.com/coverallsapp/github-action/issues/4#issuecomment-529399410
+    - run: coveralls
+      env:
+        COVERALLS_REPO_TOKEN: ${{ secrets.COVERALLS_REPO_TOKEN }}

+ 4 - 0
.gitignore

@@ -0,0 +1,4 @@
+.coverage
+.mypy_cache/
+build/
+dist/

+ 6 - 0
.pylintrc

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+[MESSAGE CONTROL]
+
+disable=bad-continuation, # black
+        consider-iterating-dictionary, # "Explicit is better than implicit."
+        missing-function-docstring,
+        missing-module-docstring

+ 12 - 0
CHANGELOG.md

@@ -0,0 +1,12 @@
+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+### Added
+- MQTT message on topic `systemctl/hostname/poweroff`
+  schedules a poweroff via systemd's dbus interface (4 seconds delay)
+
+[Unreleased]: https://github.com/fphammerle/systemctl-mqtt/tree/master

+ 674 - 0
COPYING

@@ -0,0 +1,674 @@
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+to copy, free of charge and under the terms of this License, through a
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+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
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+
+  If, pursuant to or in connection with a single transaction or
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+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
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+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
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+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
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+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
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+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program 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.
+
+    This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.

+ 18 - 0
Pipfile

@@ -0,0 +1,18 @@
+[[source]]
+url = "https://pypi.org/simple"
+verify_ssl = true
+name = "pypi"
+
+[packages]
+systemctl-mqtt = {editable = true,path = "."}
+
+[dev-packages]
+black = "==19.10b0"
+mypy = "*"
+pylint = "*"
+pylint-import-requirements = "*"
+pytest = "*"
+pytest-cov = "*"
+
+[requires]
+python_version = "3"

+ 354 - 0
Pipfile.lock

@@ -0,0 +1,354 @@
+{
+    "_meta": {
+        "hash": {
+            "sha256": "0574fc521848e7aecd1bb8fb168855acbaa1705f4993c34ef5a2eda759d41d68"
+        },
+        "pipfile-spec": 6,
+        "requires": {
+            "python_version": "3"
+        },
+        "sources": [
+            {
+                "name": "pypi",
+                "url": "https://pypi.org/simple",
+                "verify_ssl": true
+            }
+        ]
+    },
+    "default": {
+        "dbus-python": {
+            "hashes": [
+                "sha256:11238f1d86c995d8aed2e22f04a1e3779f0d70e587caffeab4857f3c662ed5a4"
+            ],
+            "version": "==1.2.16"
+        },
+        "paho-mqtt": {
+            "hashes": [
+                "sha256:e3d286198baaea195c8b3bc221941d25a3ab0e1507fc1779bdb7473806394be4"
+            ],
+            "version": "==1.5.0"
+        },
+        "systemctl-mqtt": {
+            "editable": true,
+            "path": "."
+        }
+    },
+    "develop": {
+        "appdirs": {
+            "hashes": [
+                "sha256:7d5d0167b2b1ba821647616af46a749d1c653740dd0d2415100fe26e27afdf41",
+                "sha256:a841dacd6b99318a741b166adb07e19ee71a274450e68237b4650ca1055ab128"
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+            "version": "==1.4.4"
+        },
+        "astroid": {
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+            "version": "==2.4.2"
+        },
+        "attrs": {
+            "hashes": [
+                "sha256:08a96c641c3a74e44eb59afb61a24f2cb9f4d7188748e76ba4bb5edfa3cb7d1c",
+                "sha256:f7b7ce16570fe9965acd6d30101a28f62fb4a7f9e926b3bbc9b61f8b04247e72"
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+            "version": "==19.3.0"
+        },
+        "black": {
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+            "index": "pypi",
+            "version": "==19.10b0"
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+            "version": "==7.1.2"
+        },
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+                "sha256:cf59bbf282b627130f5ba68b7fa3abdb96372b24b66bdf72a4920e8153fc7910",
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+                "sha256:fbff901c54c22425a5b809b914a3bfaf4b9570eee0e5ce8186ac71eb2025191c"
+            ],
+            "version": "==2020.6.8"
+        },
+        "six": {
+            "hashes": [
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+                "sha256:8b74bedcbbbaca38ff6d7491d76f2b06b3592611af620f8426e82dddb04a5ced"
+            ],
+            "version": "==1.15.0"
+        },
+        "toml": {
+            "hashes": [
+                "sha256:926b612be1e5ce0634a2ca03470f95169cf16f939018233a670519cb4ac58b0f",
+                "sha256:bda89d5935c2eac546d648028b9901107a595863cb36bae0c73ac804a9b4ce88"
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+                "sha256:fc0fea399acb12edbf8a628ba8d2312f583bdbdb3335635db062fa98cf71fca4",
+                "sha256:fe460b922ec15dd205595c9b5b99e2f056fd98ae8f9f56b888e7a17dc2b757e7"
+            ],
+            "markers": "implementation_name == 'cpython' and python_version < '3.8'",
+            "version": "==1.4.1"
+        },
+        "typing-extensions": {
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+                "sha256:6e95524d8a547a91e08f404ae485bbb71962de46967e1b71a0cb89af24e761c5",
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+                "sha256:f8d2bd89d25bc39dabe7d23df520442fa1d8969b82544370e03d88b5a591c392"
+            ],
+            "version": "==3.7.4.2"
+        },
+        "wcwidth": {
+            "hashes": [
+                "sha256:79375666b9954d4a1a10739315816324c3e73110af9d0e102d906fdb0aec009f",
+                "sha256:8c6b5b6ee1360b842645f336d9e5d68c55817c26d3050f46b235ef2bc650e48f"
+            ],
+            "version": "==0.2.4"
+        },
+        "wrapt": {
+            "hashes": [
+                "sha256:b62ffa81fb85f4332a4f609cab4ac40709470da05643a082ec1eb88e6d9b97d7"
+            ],
+            "version": "==1.12.1"
+        },
+        "zipp": {
+            "hashes": [
+                "sha256:aa36550ff0c0b7ef7fa639055d797116ee891440eac1a56f378e2d3179e0320b",
+                "sha256:c599e4d75c98f6798c509911d08a22e6c021d074469042177c8c86fb92eefd96"
+            ],
+            "version": "==3.1.0"
+        }
+    }
+}

+ 54 - 0
README.md

@@ -0,0 +1,54 @@
+# systemctl-mqtt
+
+[![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
+[![CI Pipeline Status](https://github.com/fphammerle/systemctl-mqtt/workflows/tests/badge.svg)](https://github.com/fphammerle/systemctl-mqtt/actions)
+[![Coverage Status](https://coveralls.io/repos/github/fphammerle/systemctl-mqtt/badge.svg?branch=master)](https://coveralls.io/github/fphammerle/systemctl-mqtt?branch=master)
+[![Last Release](https://img.shields.io/pypi/v/systemctl-mqtt.svg)](https://pypi.org/project/systemctl-mqtt/#history)
+[![Compatible Python Versions](https://img.shields.io/pypi/pyversions/systemctl-mqtt.svg)](https://pypi.org/project/systemctl-mqtt/)
+
+MQTT client triggering shutdown on [systemd](https://freedesktop.org/wiki/Software/systemd/)-based systems
+
+## Setup
+
+```sh
+$ pip3 install --user --upgrade systemctl-mqtt
+$ systemctl-mqtt --mqtt-host HOSTNAME_OR_IP_ADDRESS
+```
+
+Schedule poweroff by sending a MQTT message to topic `systemctl/hostname/poweroff`.
+
+```sh
+$ mosquitto_pub -h MQTT_BROKER -t systemctl/hostname/poweroff -n
+```
+
+## Home Assistant 🏡
+
+### Sample Setup
+
+```yaml
+# https://www.home-assistant.io/docs/mqtt/broker/#configuration-variables
+mqtt:
+  broker: BROKER_HOSTNAME_OR_IP_ADDRESS
+  # credentials, additional options…
+
+script:
+  poweroff_raspberry_pi:
+    sequence:
+      service: mqtt.publish
+      data:
+        topic: systemctl/raspberrypi/poweroff
+
+homeassistant:
+  customize:
+    script.poweroff_raspberry_pi:
+      friendly_name: poweroff pi
+      icon: mdi:power
+```
+
+## MQTT Authentication
+
+```sh
+systemctl-mqtt --mqtt-username me --mqtt-password secret …
+# or
+systemctl-mqtt --mqtt-username me --mqtt-password-file /var/lib/secrets/mqtt/password …
+```

+ 2 - 0
mypy.ini

@@ -0,0 +1,2 @@
+[mypy]
+ignore_missing_imports = True

+ 68 - 0
setup.py

@@ -0,0 +1,68 @@
+# systemctl-mqtt - MQTT client triggering shutdown on systemd-based systems
+#
+# Copyright (C) 2020 Fabian Peter Hammerle <fabian@hammerle.me>
+#
+# This program 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
+# any later version.
+#
+# This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.
+
+# import pathlib
+
+import setuptools
+
+_REPO_URL = "https://github.com/fphammerle/systemctl-mqtt"
+
+setuptools.setup(
+    name="systemctl-mqtt",
+    use_scm_version={
+        # > AssertionError: cant parse version docker/0.1.0-amd64
+        # https://github.com/pypa/setuptools_scm/blob/master/src/setuptools_scm/git.py#L15
+        "git_describe_command": "git describe --dirty --tags --long --match v*",
+    },
+    packages=setuptools.find_packages(),
+    description="MQTT client triggering shutdown on systemd-based systems",
+    # TODO long_description=pathlib.Path(__file__).parent.joinpath("README.md").read_text(),
+    long_description_content_type="text/markdown",
+    author="Fabian Peter Hammerle",
+    author_email="fabian@hammerle.me",
+    url=_REPO_URL,
+    project_urls={"Changelog": _REPO_URL + "/blob/master/CHANGELOG.md"},
+    license="GPLv3+",
+    keywords=[
+        "IoT",
+        "automation",
+        "home-assistant",
+        "home-automation",
+        "mqtt",
+        "shutdown",
+        "systemd",
+    ],
+    classifiers=[
+        # https://pypi.org/classifiers/
+        "Development Status :: 2 - Pre-Alpha",
+        "Intended Audience :: End Users/Desktop",
+        "Intended Audience :: System Administrators",
+        "License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)",
+        "Operating System :: POSIX :: Linux",
+        # .github/workflows/python.yml
+        "Programming Language :: Python :: 3.5",
+        "Programming Language :: Python :: 3.6",
+        "Programming Language :: Python :: 3.7",
+        "Programming Language :: Python :: 3.8",
+        "Topic :: Home Automation",
+    ],
+    entry_points={"console_scripts": ["systemctl-mqtt = systemctl_mqtt:_main",]},
+    # https://dbus.freedesktop.org/doc/dbus-python/news.html
+    install_requires=["dbus-python<2", "paho-mqtt<2"],
+    setup_requires=["setuptools_scm"],
+    tests_require=["pytest"],
+)

+ 180 - 0
systemctl_mqtt/__init__.py

@@ -0,0 +1,180 @@
+# systemctl-mqtt - MQTT client triggering shutdown on systemd-based systems
+#
+# Copyright (C) 2020 Fabian Peter Hammerle <fabian@hammerle.me>
+#
+# This program 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
+# any later version.
+#
+# This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.
+
+import argparse
+import datetime
+import functools
+import logging
+import pathlib
+import socket
+import typing
+
+import dbus
+
+import paho.mqtt.client
+
+_LOGGER = logging.getLogger(__name__)
+
+_SHUTDOWN_DELAY = datetime.timedelta(seconds=4)
+
+
+def _get_login_manager() -> dbus.proxies.Interface:
+    # https://dbus.freedesktop.org/doc/dbus-python/tutorial.html
+    bus = dbus.SystemBus()
+    proxy: dbus.proxies.ProxyObject = bus.get_object(
+        bus_name="org.freedesktop.login1", object_path="/org/freedesktop/login1"
+    )
+    # https://freedesktop.org/wiki/Software/systemd/logind/
+    return dbus.Interface(object=proxy, dbus_interface="org.freedesktop.login1.Manager")
+
+
+def _schedule_shutdown(action: str) -> None:
+    # https://github.com/systemd/systemd/blob/v237/src/systemctl/systemctl.c#L8553
+    assert action in ["poweroff", "reboot"], action
+    shutdown_datetime = datetime.datetime.now() + _SHUTDOWN_DELAY
+    _LOGGER.info(
+        "scheduling %s for %s",
+        action,
+        shutdown_datetime.isoformat(sep=" ", timespec="seconds"),
+    )
+    shutdown_epoch_usec = int(shutdown_datetime.timestamp() * 10 ** 6)
+    _get_login_manager().ScheduleShutdown(action, shutdown_epoch_usec)
+
+
+_MQTT_TOPIC_SUFFIX_ACTION_MAPPING = {
+    "poweroff": functools.partial(_schedule_shutdown, action="poweroff"),
+}
+
+
+class _Settings:
+    # pylint: disable=too-few-public-methods
+    def __init__(self, mqtt_topic_prefix: str) -> None:
+        self.mqtt_topic_action_mapping: typing.Dict[str, typing.Callable] = {}
+        for topic_suffix, action in _MQTT_TOPIC_SUFFIX_ACTION_MAPPING.items():
+            topic = mqtt_topic_prefix + "/" + topic_suffix
+            self.mqtt_topic_action_mapping[topic] = action
+
+
+def _mqtt_on_connect(
+    mqtt_client: paho.mqtt.client.Client,
+    settings: _Settings,
+    flags: typing.Dict,
+    return_code: int,
+) -> None:
+    # pylint: disable=unused-argument; callback
+    # https://github.com/eclipse/paho.mqtt.python/blob/v1.5.0/src/paho/mqtt/client.py#L441
+    assert return_code == 0, return_code  # connection accepted
+    mqtt_broker_host, mqtt_broker_port = mqtt_client.socket().getpeername()
+    _LOGGER.debug("connected to MQTT broker %s:%d", mqtt_broker_host, mqtt_broker_port)
+    for topic in settings.mqtt_topic_action_mapping.keys():
+        _LOGGER.debug("subscribing to %s", topic)
+        mqtt_client.subscribe(topic)
+
+
+def _mqtt_on_message(
+    mqtt_client: paho.mqtt.client.Client,
+    settings: _Settings,
+    message: paho.mqtt.client.MQTTMessage,
+) -> None:
+    # pylint: disable=unused-argument; callback
+    # https://github.com/eclipse/paho.mqtt.python/blob/v1.5.0/src/paho/mqtt/client.py#L469
+    _LOGGER.debug("received topic=%s payload=%r", message.topic, message.payload)
+    if message.retain:
+        _LOGGER.info("ignoring retained message")
+        return
+    try:
+        action = settings.mqtt_topic_action_mapping[message.topic]
+    except KeyError:
+        _LOGGER.warning("unexpected topic %s", message.topic)
+        return
+    action()
+
+
+def _run(
+    mqtt_host: str,
+    mqtt_port: int,
+    mqtt_username: typing.Optional[str],
+    mqtt_password: typing.Optional[str],
+    mqtt_topic_prefix: str,
+) -> None:
+    # https://pypi.org/project/paho-mqtt/
+    mqtt_client = paho.mqtt.client.Client(
+        userdata=_Settings(mqtt_topic_prefix=mqtt_topic_prefix)
+    )
+    mqtt_client.on_connect = _mqtt_on_connect
+    mqtt_client.on_message = _mqtt_on_message
+    _LOGGER.info(
+        "connecting to MQTT broker %s:%d", mqtt_host, mqtt_port,
+    )
+    if mqtt_username:
+        mqtt_client.username_pw_set(username=mqtt_username, password=mqtt_password)
+    elif mqtt_password:
+        raise ValueError("Missing MQTT username")
+    mqtt_client.connect(host=mqtt_host, port=mqtt_port)
+    mqtt_client.loop_forever()
+
+
+def _get_hostname() -> str:
+    return socket.gethostname()
+
+
+def _main() -> None:
+    logging.basicConfig(
+        level=logging.DEBUG,
+        format="%(asctime)s:%(levelname)s:%(message)s",
+        datefmt="%Y-%m-%dT%H:%M:%S%z",
+    )
+    argparser = argparse.ArgumentParser(
+        description="MQTT client triggering shutdown on systemd-based systems",
+        formatter_class=argparse.ArgumentDefaultsHelpFormatter,
+    )
+    argparser.add_argument("--mqtt-host", type=str, required=True)
+    argparser.add_argument("--mqtt-port", type=int, default=1883)
+    argparser.add_argument("--mqtt-username", type=str)
+    password_argument_group = argparser.add_mutually_exclusive_group()
+    password_argument_group.add_argument("--mqtt-password", type=str)
+    password_argument_group.add_argument(
+        "--mqtt-password-file",
+        type=pathlib.Path,
+        metavar="PATH",
+        dest="mqtt_password_path",
+        help="stripping trailing newline",
+    )
+    # https://www.home-assistant.io/docs/mqtt/discovery/#discovery_prefix
+    argparser.add_argument(
+        "--mqtt-topic-prefix",
+        type=str,
+        default="systemctl/" + _get_hostname(),
+        help="test",
+    )
+    args = argparser.parse_args()
+    if args.mqtt_password_path:
+        # .read_text() replaces \r\n with \n
+        mqtt_password = args.mqtt_password_path.read_bytes().decode()
+        if mqtt_password.endswith("\r\n"):
+            mqtt_password = mqtt_password[:-2]
+        elif mqtt_password.endswith("\n"):
+            mqtt_password = mqtt_password[:-1]
+    else:
+        mqtt_password = args.mqtt_password
+    _run(
+        mqtt_host=args.mqtt_host,
+        mqtt_port=args.mqtt_port,
+        mqtt_username=args.mqtt_username,
+        mqtt_password=mqtt_password,
+        mqtt_topic_prefix=args.mqtt_topic_prefix,
+    )

+ 169 - 0
tests/test_cli.py

@@ -0,0 +1,169 @@
+import typing
+import unittest.mock
+
+import pytest
+
+import systemctl_mqtt
+
+
+@pytest.mark.parametrize(
+    (
+        "argv",
+        "expected_mqtt_host",
+        "expected_mqtt_port",
+        "expected_username",
+        "expected_password",
+        "expected_topic_prefix",
+    ),
+    [
+        (
+            ["", "--mqtt-host", "mqtt-broker.local"],
+            "mqtt-broker.local",
+            1883,
+            None,
+            None,
+            None,
+        ),
+        (
+            ["", "--mqtt-host", "mqtt-broker.local", "--mqtt-port", "8883"],
+            "mqtt-broker.local",
+            8883,
+            None,
+            None,
+            None,
+        ),
+        (
+            ["", "--mqtt-host", "mqtt-broker.local", "--mqtt-username", "me"],
+            "mqtt-broker.local",
+            1883,
+            "me",
+            None,
+            None,
+        ),
+        (
+            [
+                "",
+                "--mqtt-host",
+                "mqtt-broker.local",
+                "--mqtt-username",
+                "me",
+                "--mqtt-password",
+                "secret",
+            ],
+            "mqtt-broker.local",
+            1883,
+            "me",
+            "secret",
+            None,
+        ),
+        (
+            [
+                "",
+                "--mqtt-host",
+                "mqtt-broker.local",
+                "--mqtt-topic-prefix",
+                "system/command",
+            ],
+            "mqtt-broker.local",
+            1883,
+            None,
+            None,
+            "system/command",
+        ),
+    ],
+)
+def test__main(
+    argv,
+    expected_mqtt_host,
+    expected_mqtt_port,
+    expected_username,
+    expected_password,
+    expected_topic_prefix: typing.Optional[str],
+):
+    # pylint: disable=too-many-arguments
+    with unittest.mock.patch("systemctl_mqtt._run") as run_mock, unittest.mock.patch(
+        "sys.argv", argv
+    ), unittest.mock.patch("systemctl_mqtt._get_hostname", return_value="hostname"):
+        # pylint: disable=protected-access
+        systemctl_mqtt._main()
+    run_mock.assert_called_once_with(
+        mqtt_host=expected_mqtt_host,
+        mqtt_port=expected_mqtt_port,
+        mqtt_username=expected_username,
+        mqtt_password=expected_password,
+        mqtt_topic_prefix=expected_topic_prefix or "systemctl/hostname",
+    )
+
+
+@pytest.mark.parametrize(
+    ("password_file_content", "expected_password",),
+    [
+        ("secret", "secret"),
+        ("secret space", "secret space"),
+        ("secret   ", "secret   "),
+        ("  secret ", "  secret "),
+        ("secret\n", "secret"),
+        ("secret\n\n", "secret\n"),
+        ("secret\r\n", "secret"),
+        ("secret\n\r\n", "secret\n"),
+        ("你好\n", "你好"),
+    ],
+)
+def test__main_password_file(tmpdir, password_file_content, expected_password):
+    mqtt_password_path = tmpdir.join("mqtt-password")
+    with mqtt_password_path.open("w") as mqtt_password_file:
+        mqtt_password_file.write(password_file_content)
+    with unittest.mock.patch("systemctl_mqtt._run") as run_mock, unittest.mock.patch(
+        "sys.argv",
+        [
+            "",
+            "--mqtt-host",
+            "localhost",
+            "--mqtt-username",
+            "me",
+            "--mqtt-password-file",
+            str(mqtt_password_path),
+        ],
+    ), unittest.mock.patch("systemctl_mqtt._get_hostname", return_value="hostname"):
+        # pylint: disable=protected-access
+        systemctl_mqtt._main()
+    run_mock.assert_called_once_with(
+        mqtt_host="localhost",
+        mqtt_port=1883,
+        mqtt_username="me",
+        mqtt_password=expected_password,
+        mqtt_topic_prefix="systemctl/hostname",
+    )
+
+
+def test__main_password_file_collision(capsys):
+    with unittest.mock.patch(
+        "sys.argv",
+        [
+            "",
+            "--mqtt-host",
+            "localhost",
+            "--mqtt-username",
+            "me",
+            "--mqtt-password",
+            "secret",
+            "--mqtt-password-file",
+            "/var/lib/secrets/mqtt/password",
+        ],
+    ):
+        with pytest.raises(SystemExit):
+            # pylint: disable=protected-access
+            systemctl_mqtt._main()
+    out, err = capsys.readouterr()
+    assert not out
+    assert (
+        "argument --mqtt-password-file: not allowed with argument --mqtt-password\n"
+        in err
+    )
+
+
+@pytest.mark.parametrize("hostname", ["test"])
+def test__get_hostname(hostname):
+    with unittest.mock.patch("socket.gethostname", return_value=hostname):
+        # pylint: disable=protected-access
+        assert systemctl_mqtt._get_hostname() == hostname

+ 57 - 0
tests/test_dbus.py

@@ -0,0 +1,57 @@
+import datetime
+import unittest.mock
+
+import dbus
+import pytest
+
+import systemctl_mqtt
+
+_UTC = datetime.timezone(offset=datetime.timedelta(seconds=0))
+
+# pylint: disable=protected-access
+
+
+def test__get_login_manager():
+    login_manager = systemctl_mqtt._get_login_manager()
+    assert isinstance(login_manager, dbus.proxies.Interface)
+    assert login_manager.dbus_interface == "org.freedesktop.login1.Manager"
+    # https://freedesktop.org/wiki/Software/systemd/logind/
+    assert isinstance(login_manager.CanPowerOff(), dbus.String)
+
+
+@pytest.mark.parametrize("action", ["poweroff", "reboot"])
+def test__schedule_shutdown(action):
+    login_manager_mock = unittest.mock.MagicMock()
+    with unittest.mock.patch(
+        "systemctl_mqtt._get_login_manager", return_value=login_manager_mock
+    ):
+        systemctl_mqtt._schedule_shutdown(action=action)
+    login_manager_mock.ScheduleShutdown.assert_called_once()
+    schedule_args, schedule_kwargs = login_manager_mock.ScheduleShutdown.call_args
+    assert len(schedule_args) == 2
+    assert schedule_args[0] == action
+    shutdown_datetime = datetime.datetime.fromtimestamp(
+        schedule_args[1] / 10 ** 6, tz=_UTC,
+    )
+    delay = shutdown_datetime - datetime.datetime.now(tz=_UTC)
+    assert delay.total_seconds() == pytest.approx(
+        datetime.timedelta(seconds=4).total_seconds(), abs=0.1,
+    )
+    assert not schedule_kwargs
+
+
+@pytest.mark.parametrize(
+    ("topic_suffix", "expected_action_arg"), [("poweroff", "poweroff")]
+)
+def test_mqtt_topic_suffix_action_mapping(topic_suffix, expected_action_arg):
+    action = systemctl_mqtt._MQTT_TOPIC_SUFFIX_ACTION_MAPPING[topic_suffix]
+    login_manager_mock = unittest.mock.MagicMock()
+    with unittest.mock.patch(
+        "systemctl_mqtt._get_login_manager", return_value=login_manager_mock
+    ):
+        action()
+    login_manager_mock.ScheduleShutdown.assert_called_once()
+    schedule_args, schedule_kwargs = login_manager_mock.ScheduleShutdown.call_args
+    assert len(schedule_args) == 2
+    assert schedule_args[0] == expected_action_arg
+    assert not schedule_kwargs

+ 152 - 0
tests/test_mqtt.py

@@ -0,0 +1,152 @@
+import logging
+import unittest.mock
+
+import pytest
+from paho.mqtt.client import MQTTMessage
+
+import systemctl_mqtt
+
+# pylint: disable=protected-access
+
+
+@pytest.mark.parametrize("mqtt_host", ["mqtt-broker.local"])
+@pytest.mark.parametrize("mqtt_port", [1833])
+@pytest.mark.parametrize("mqtt_topic_prefix", ["systemctl/host", "system/command"])
+def test__run(mqtt_host, mqtt_port, mqtt_topic_prefix):
+    with unittest.mock.patch(
+        "paho.mqtt.client.Client"
+    ) as mqtt_client_mock, unittest.mock.patch(
+        "systemctl_mqtt._mqtt_on_message"
+    ) as message_handler_mock:
+        systemctl_mqtt._run(
+            mqtt_host=mqtt_host,
+            mqtt_port=mqtt_port,
+            mqtt_username=None,
+            mqtt_password=None,
+            mqtt_topic_prefix=mqtt_topic_prefix,
+        )
+    mqtt_client_mock.assert_called_once()
+    init_args, init_kwargs = mqtt_client_mock.call_args
+    assert not init_args
+    assert len(init_kwargs) == 1
+    settings = init_kwargs["userdata"]
+    assert isinstance(settings, systemctl_mqtt._Settings)
+    assert mqtt_topic_prefix + "/poweroff" in settings.mqtt_topic_action_mapping
+    assert not mqtt_client_mock().username_pw_set.called
+    mqtt_client_mock().connect.assert_called_once_with(host=mqtt_host, port=mqtt_port)
+    mqtt_client_mock().socket().getpeername.return_value = (mqtt_host, mqtt_port)
+    mqtt_client_mock().on_connect(mqtt_client_mock(), settings, {}, 0)
+    mqtt_client_mock().subscribe.assert_called_once_with(
+        mqtt_topic_prefix + "/poweroff"
+    )
+    mqtt_client_mock().on_message(mqtt_client_mock(), settings, "message")
+    message_handler_mock.assert_called_once()
+    mqtt_client_mock().loop_forever.assert_called_once_with()
+
+
+@pytest.mark.parametrize("mqtt_host", ["mqtt-broker.local"])
+@pytest.mark.parametrize("mqtt_port", [1833])
+@pytest.mark.parametrize("mqtt_username", ["me"])
+@pytest.mark.parametrize("mqtt_password", [None, "secret"])
+@pytest.mark.parametrize("mqtt_topic_prefix", ["systemctl/host"])
+def test__run_authentication(
+    mqtt_host, mqtt_port, mqtt_username, mqtt_password, mqtt_topic_prefix
+):
+    with unittest.mock.patch("paho.mqtt.client.Client") as mqtt_client_mock:
+        systemctl_mqtt._run(
+            mqtt_host=mqtt_host,
+            mqtt_port=mqtt_port,
+            mqtt_username=mqtt_username,
+            mqtt_password=mqtt_password,
+            mqtt_topic_prefix=mqtt_topic_prefix,
+        )
+    mqtt_client_mock.assert_called_once()
+    init_args, init_kwargs = mqtt_client_mock.call_args
+    assert not init_args
+    assert set(init_kwargs.keys()) == {"userdata"}
+    mqtt_client_mock().username_pw_set.assert_called_once_with(
+        username=mqtt_username, password=mqtt_password,
+    )
+
+
+@pytest.mark.parametrize("mqtt_host", ["mqtt-broker.local"])
+@pytest.mark.parametrize("mqtt_port", [1833])
+@pytest.mark.parametrize("mqtt_password", ["secret"])
+def test__run_authentication_missing_username(mqtt_host, mqtt_port, mqtt_password):
+    with unittest.mock.patch("paho.mqtt.client.Client"):
+        with pytest.raises(ValueError):
+            systemctl_mqtt._run(
+                mqtt_host=mqtt_host,
+                mqtt_port=mqtt_port,
+                mqtt_username=None,
+                mqtt_password=mqtt_password,
+                mqtt_topic_prefix="prefix",
+            )
+
+
+@pytest.mark.parametrize("mqtt_topic_prefix", ["system/command"])
+@pytest.mark.parametrize("payload", [b"", b"junk"])
+def test__mqtt_on_message_poweroff(caplog, mqtt_topic_prefix: str, payload: bytes):
+    mqtt_topic = mqtt_topic_prefix + "/poweroff"
+    message = MQTTMessage(topic=mqtt_topic.encode())
+    message.payload = payload
+    settings = systemctl_mqtt._Settings(mqtt_topic_prefix=mqtt_topic_prefix)
+    action_mock = unittest.mock.MagicMock()
+    settings.mqtt_topic_action_mapping[mqtt_topic] = action_mock  # functools.partial
+    with caplog.at_level(logging.DEBUG):
+        systemctl_mqtt._mqtt_on_message(
+            None, settings, message,
+        )
+    assert len(caplog.records) == 1
+    assert caplog.records[0].levelno == logging.DEBUG
+    assert caplog.records[0].message == (
+        "received topic={} payload={!r}".format(mqtt_topic, payload)
+    )
+    action_mock.assert_called_once_with()
+
+
+@pytest.mark.parametrize(
+    ("topic", "payload"), [("system/poweroff", b""), ("system/poweroff", "payload"),],
+)
+def test__mqtt_on_message_ignored(
+    caplog, topic: str, payload: bytes,
+):
+    message = MQTTMessage(topic=topic.encode())
+    message.payload = payload
+    settings = systemctl_mqtt._Settings(mqtt_topic_prefix="system/command")
+    settings.mqtt_topic_action_mapping = {}  # provoke KeyError on access
+    with caplog.at_level(logging.DEBUG):
+        systemctl_mqtt._mqtt_on_message(
+            None, settings, message,
+        )
+    assert len(caplog.records) == 2
+    assert caplog.records[0].levelno == logging.DEBUG
+    assert caplog.records[0].message == (
+        "received topic={} payload={!r}".format(topic, payload)
+    )
+    assert caplog.records[1].levelno == logging.WARNING
+    assert caplog.records[1].message == "unexpected topic {}".format(topic)
+
+
+@pytest.mark.parametrize(
+    ("topic", "payload"), [("system/command/poweroff", b"")],
+)
+def test__mqtt_on_message_ignored_retained(
+    caplog, topic: str, payload: bytes,
+):
+    message = MQTTMessage(topic=topic.encode())
+    message.payload = payload
+    message.retain = True
+    settings = systemctl_mqtt._Settings(mqtt_topic_prefix="system/command")
+    settings.mqtt_topic_action_mapping = {}  # provoke KeyError on access
+    with caplog.at_level(logging.DEBUG):
+        systemctl_mqtt._mqtt_on_message(
+            None, settings, message,
+        )
+    assert len(caplog.records) == 2
+    assert caplog.records[0].levelno == logging.DEBUG
+    assert caplog.records[0].message == (
+        "received topic={} payload={!r}".format(topic, payload)
+    )
+    assert caplog.records[1].levelno == logging.INFO
+    assert caplog.records[1].message == "ignoring retained message"

+ 19 - 0
tests/test_settings.py

@@ -0,0 +1,19 @@
+import functools
+
+import pytest
+
+import systemctl_mqtt
+
+# pylint: disable=protected-access
+
+
+@pytest.mark.parametrize("mqtt_topic_prefix", ["systemctl/host", "system/command"])
+def test_mqtt_topic_action_mapping(mqtt_topic_prefix):
+    settings = systemctl_mqtt._Settings(mqtt_topic_prefix=mqtt_topic_prefix)
+    assert len(settings.mqtt_topic_action_mapping) == 1
+    action = settings.mqtt_topic_action_mapping[mqtt_topic_prefix + "/poweroff"]
+    assert isinstance(action, functools.partial)
+    # pylint: disable=comparison-with-callable
+    assert action.func == systemctl_mqtt._schedule_shutdown
+    assert not action.args
+    assert action.keywords == {"action": "poweroff"}