Can cf-agent easily know about "systemd" state/target, etc.?

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        Context: Linux "systemd" machine; CFE 3.18.

        We have an emerging use case to run a specific, minimal
        (i.e. fast) subset of our cf-agent policy during machine
        shutdown/halt. We are considering a "systemd" service with
        something like:

        ExecStop=cf-agent....

        Is there something already in place which can tell us the
        current state (target?) of systemd? Perhaps a "var" (e.g.
        "sys.") in CFE? Or perhaps something in "/proc" or similar
        that our policy could peek at?

  There aren't any system variables that hold states of systemd units
  and I am not familiar with anything in proc that indicates a systemd
  unit state.

  `bundle agent systemd_services' which is used to manage systemd
  service state parses information returned by `systemctl
  --no-ask-password --global --system
  -pLoadState,CanStop,UnitFileState,ActiveState,LoadState,CanStart,CanReload
  show <service>'

  <https://github.com/cfengine/masterfiles/blob/b91ca88286d8efece4050e9e4811e801b408d034/lib/services.cf#L370-L380>

        Failing that, we do could something like:

        ExecStop=cf-agent ... -D HALTING

  Seems like a reasonable thing to try.

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<blockquote style=3D"border-left: 2px solid gray; padding-left: 4px;">
<p>
Context: Linux "systemd" machine; CFE 3.18.
</p>

<p>
We have an emerging use case to run a specific, minimal (i.e. fast) subset =
of our cf-agent policy during machine shutdown/halt.  We are considering a
"systemd" service with something like:
</p>

<p>
ExecStop=3Dcf-agent&#x2026;.
</p>

<p>
Is there something already in place which can tell us the current state (ta=
rget?) of systemd?  Perhaps a "var" (e.g. "sys.") in CFE?  Or perhaps
something in "/proc" or similar that our policy could peek at?
</p>
</blockquote>

<p>
There aren't any system variables that hold states of systemd units and I a=
m not familiar with anything in proc that indicates a systemd unit state.
</p>

<p>
<code>bundle agent systemd_services</code> which is used to manage systemd =
service state parses information returned by <code>systemctl --no-ask-passw=
ord --global --system -pLoadState,CanStop,UnitFileState,ActiveState,LoadSta=
te,CanStart,CanReload show &lt;service&gt;</code>
</p>

<p>
<a href=3D"https://github.com/cfengine/masterfiles/blob/b91ca88286d8efece40=
50e9e4811e801b408d034/lib/services.cf#L370-L380">https://github.com/cfengin=
e/masterfiles/blob/b91ca88286d8efece4050e9e4811e801b408d034/lib/services.cf=
#L370-L380</a>
</p>

<blockquote style=3D"border-left: 2px solid gray; padding-left: 4px;">
<p>
Failing that, we do could something like:
</p>

<p>
ExecStop=3Dcf-agent &#x2026; -D HALTING
</p>
</blockquote>

<p>
Seems like a reasonable thing to try.
</p>

<p></p>

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--
Nick Anderson | Doer of Things | (+1) 785-550-1767 | https://northern.tech

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