ansible-systemd/plugins/modules/system_service.py

#!/usr/bin/python3
import pathlib
from typing import List, Union

try:
    from ansible_collections.sebastian.systemd.plugins.module_utils.generic import SYSTEMD_SERVICE_CONFIG, Types
    from ansible_collections.sebastian.systemd.plugins.module_utils.module import SystemdUnitModule, installable
except ImportError:
    from plugins.module_utils.generic import SYSTEMD_SERVICE_CONFIG, Types
    from plugins.module_utils.module import SystemdUnitModule, installable


@installable
class Module(SystemdUnitModule):
    """Creates System Services units"""

    name = "system_service"
    module_spec = dict(
        argument_spec=dict(
            name=Types.str(required=True),
            user=Types.str(),
            group=Types.str(),
            type=Types.str(
                choices=("simple", "exec", "forking", "oneshot", "dbus", "notify", "notify-reload", "idle"),
                default="simple",
                help="Type of the systemd service.\n"
                "simple and exec start long running services that run in the same process over the whole time, exec is waiting until the process was started completly.\n"
                "forking does some things in the foreground, starts an background process and then exits to leave the work to the background process.\n"
                "oneshot processes are started by systemd, do their work and then exit, similar to cronjobs.\n"
                "dbus services will be considered started up once they aquire the specified dbus bus"
                "notify and notify-reload notify systemd about the start up via sd_notify. notify-reload needs also inform systemd on reloads and when it is ready again after an reload.\n"
                "idle is similar to simple, but it can delay the start up by a few seconds.",
            ),
            pre=Types.list(str, help="command or list of commands that are started before the main command(Types.str)"),
            start=Types.list(
                str,
                True,
                help="command or list of commands that are started as main programm. Multiple commands are only allowed in a oneshot command",
            ),
            post=Types.list(str, help="Command or list of commands that are started after the main command(s) stopped without problems."),
        ),
    )

    def prepare(self):
        self.unitfile = (SYSTEMD_SERVICE_CONFIG / self.get("name")).with_stem(".service")
        self.__unit = None
        if self.get("type", "simple") != "oneshot" and len(self.get("start")) > 1:
            self.module.fail_json("only oneshot services are allowed to have multiple start commands", **self.result)

    def service(self):
        section = "[Service]\n"
        if self.get("type"):
            section += "Type=".format(self.get("type"))
        if self.get("pre", False):
            for cmd in self.get("pre"):
                section += "ExecStartPre={}".format(cmd)
        if self.get("start", False):
            for cmd in self.get("start"):
                section += "ExecStart={}".format(cmd)
        if self.get("post", False):
            for cmd in self.get("post"):
                section += "ExecStartPost={}".format(cmd)
        if self.get("user", False):
            section += "User={}".format(self.get("user"))
        if self.get("group", False):
            section += "Group={}".format(self.get("group"))
        return section

    def unit(self) -> str:
        if self.__unit is None:
            self.__unit = "\n".join(
                (
                    self.header(),
                    self.service(),
                    self.install(),
                )
            )
        return self.__unit


DOCUMENTATION = """---
description:
- Creates System Services units
module: system_service
options:
  after:
    default: []
    description:
    - list of units that this unit wants to be started after this unit
    elements: str
    required: false
    type: list
  before:
    default: []
    description:
    - list of units that this unit needs to be started before this unit.
    elements: str
    required: false
    type: list
  description:
    description:
    - An description for programs that access systemd
    required: false
    type: str
  documentation:
    default: []
    description:
    - Paths where documentation can be found
    elements: str
    required: false
    type: list
  group:
    required: false
    type: str
  name:
    required: true
    type: str
  partof:
    default: []
    description:
    - list of units that this unit is part of.
    - If the restart this unit does it too, but if this restarts it does not affect
      the other units.
    elements: str
    required: false
    type: list
  post:
    default: []
    description:
    - Command or list of commands that are started after the main command(s) stopped
      without problems.
    elements: str
    required: false
    type: list
  pre:
    default: []
    description:
    - command or list of commands that are started before the main command(Types.str)
    elements: str
    required: false
    type: list
  required_by:
    default: []
    description:
    - systemd units that require this mount
    elements: str
    required: false
    type: list
  requires:
    default: []
    description:
    - list of units that this unit requires. If it fails or can't be started this
      unit fails. without before/after this is started at the same time
    elements: str
    required: false
    type: list
  start:
    description:
    - command or list of commands that are started as main programm. Multiple commands
      are only allowed in a oneshot command
    elements: str
    required: true
    type: list
  type:
    choices:
    - simple
    - exec
    - forking
    - oneshot
    - dbus
    - notify
    - notify-reload
    - idle
    default: simple
    description:
    - Type of the systemd service.
    - simple and exec start long running services that run in the same process over
      the whole time, exec is waiting until the process was started completly.
    - forking does some things in the foreground, starts an background process and
      then exits to leave the work to the background process.
    - oneshot processes are started by systemd, do their work and then exit, similar
      to cronjobs.
    - dbus services will be considered started up once they aquire the specified dbus
      busnotify and notify-reload notify systemd about the start up via sd_notify.
      notify-reload needs also inform systemd on reloads and when it is ready again
      after an reload.
    - idle is similar to simple, but it can delay the start up by a few seconds.
    required: false
    type: str
  user:
    required: false
    type: str
  wanted_by:
    default: []
    description:
    - systemd units that want the mount, but not explicitly require it. Commonly used
      for target if not service explicitly require it.
    elements: str
    required: false
    type: list
  wants:
    default: []
    description:
    - list of units that this unit wants. If it fails or can't be started it does
      not affect this unit
    elements: str
    required: false
    type: list
short_description: Creates System Services units
"""

if __name__ == "__main__":
    Module()()