ansible-systemd/plugins/modules/system_service.py

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

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


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

    name = "system_service"
    module_spec = dict(
        argument_spec=dict(
            name=Types.str(required=True, help="Name of the service"),
            serviceuser=Types.str(help="Username of under which the commands run at.", default="root"),
            servicegroup=Types.str(help="Group of under which the commands run at.", default="root"),
            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."),
            environmentfile=Types.list(
                str, help="List of file that are containing environment variables. They are evaluated before each pre/start/post command"
            ),
            environment=Types.list(
                Types.dict(
                    name=Types.str(help="name of the Environment variable", required=True),
                    value=Types.str(help="value of the Environment variable", required=True),
                ),
                help="List of environment variables that are set to each command before they run",
            ),
            workingdirectory=Types.str(
                help="The Directory that is used for the processes as current working directory",
            ),
            rwpath=Types.list(
                elements=Types.path(),
                help="Path(s) that are readable and writable (if permission allow)",
            ),
            ropath=Types.list(
                elements=Types.path(),
                help="Path(s) that are read only",
            ),
            notreadablepath=Types.list(
                elements=Types.path(),
                help="Path(s) that are not accessible by the applications",
            ),
            execpath=Types.list(
                elements=Types.path(),
                help="Path(s) where executable files are",
            ),
            noexecpath=Types.list(
                elements=Types.path(),
                help="Path(s) which are never executable (uploaded files, user accessible paths)",
            ),
            protecthome=Types.str(
                help="if true makes user specific directories (/home, /root, /run/user) inaccessible. read-only makes them read only and tmpfs is useful to create binds in it",
                choices=("true", "false", "read-only", "tmpfs"),
            ),
            protectsystem=Types.str(
                help="makes the system read only. if true /usr, /boot and /efi are read only, if full additionally /etc and if strict all except /proc, /sys and /dev",
                choices=("true", "false", "full", "strict"),
            ),
            nonewprivileges=Types.bool(
                help="disables the ability to get new capabilities for processes than already granted ones",
            ),
            statedirectory=Types.str(
                help="creates an unit specific state directory in /var/lib and sets the env var STATE_DIRECTORY with the path to it. Its cleaned up after the unit is stopped"
            ),
        ),
    )

    def prepare(self):
        self.unitfile = (SYSTEMD_SERVICE_CONFIG / self.get("name")).with_suffix(".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"
        params = []
        if self.get("environment", False):
            for env in self.get("environment"):
                params.append(f"Environment={env['name']}={env['value']}\n")
        params.extend(
            self.map_param(
                type="Type",
                pre="ExecStartPre",
                start="ExecStart",
                post="ExecStartPost",
                serviceuser="User",
                servicegroup="Group",
                workingdirectory="WorkingDirectory",
                environmentfile="EnvironmentFile",
                protecthome="ProtectHome",
                protectsystem="ProtectSystem",
                rwpath="ReadWritePaths",
                ropath="ReadOnlyPaths",
                notreadablepath="InaccessiblePaths",
                execpath="ExecPaths",
                noexecpath="NoExecPaths",
                statedirectory="StateDirectory",
                nonewprivileges="NoNewPriviledges",
            )
        )
        section += "".join(params)
        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
  environment:
    default: []
    description:
    - List of environment variables that are set to each command before they run
    elements: dict
    options:
      name:
        description:
        - name of the Environment variable
        required: true
        type: str
      value:
        description:
        - value of the Environment variable
        required: true
        type: str
    required: false
    type: list
  environmentfile:
    default: []
    description:
    - List of file that are containing environment variables. They are evaluated before
      each pre/start/post command
    elements: str
    required: false
    type: list
  execpath:
    default: []
    description:
    - Path(s) where executable files are
    elements: path
    required: false
    type: list
  name:
    description:
    - Name of the service
    required: true
    type: str
  noexecpath:
    default: []
    description:
    - Path(s) which are never executable (uploaded files, user accessible paths)
    elements: path
    required: false
    type: list
  nonewprivileges:
    description:
    - disables the ability to get new capabilities for processes than already granted
      ones
    required: false
    type: bool
  notreadablepath:
    default: []
    description:
    - Path(s) that are not accessible by the applications
    elements: path
    required: false
    type: list
  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
  protecthome:
    choices:
    - 'true'
    - 'false'
    - read-only
    - tmpfs
    description:
    - if true makes user specific directories (/home, /root, /run/user) inaccessible.
      read-only makes them read only and tmpfs is useful to create binds in it
    required: false
    type: str
  protectsystem:
    choices:
    - 'true'
    - 'false'
    - full
    - strict
    description:
    - makes the system read only. if true /usr, /boot and /efi are read only, if full
      additionally /etc and if strict all except /proc, /sys and /dev
    required: false
    type: str
  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
  ropath:
    default: []
    description:
    - Path(s) that are read only
    elements: path
    required: false
    type: list
  rwpath:
    default: []
    description:
    - Path(s) that are readable and writable (if permission allow)
    elements: path
    required: false
    type: list
  servicegroup:
    default: root
    description:
    - Group of under which the commands run at.
    required: false
    type: str
  serviceuser:
    default: root
    description:
    - Username of under which the commands run at.
    required: false
    type: str
  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
  statedirectory:
    description:
    - creates an unit specific state directory in /var/lib and sets the env var STATE_DIRECTORY
      with the path to it. Its cleaned up after the unit is stopped
    required: false
    type: str
  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
  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
  workingdirectory:
    description:
    - The Directory that is used for the processes as current working directory
    required: false
    type: str
short_description: Creates System Services units
"""

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