How get systemd status in json format

jsonsystemd

I want to get service status details (Loaded, enabled, active, running, since, Main PID) in machine readable form and I know that systemd tools have --output=json option, but if I do:

 systemctl status servicename --output=json --plain

I see something like:

● snapd.service - Snappy daemon
   Loaded: loaded (/lib/systemd/system/snapd.service; enabled; vendor preset: enabled)
   Active: active (running) since Mon 2018-04-16 11:20:07 MSK; 4h 45min ago
 Main PID: 738 (snapd)
    Tasks: 10 (limit: 4915)
   CGroup: /system.slice/snapd.service
           └─738 /usr/lib/snapd/snapd

{ "__CURSOR" : "s=461ecb6a4b814913acd57572cd1e1c82;...

Journal records are in JSON. But how to get the service status in JSON if it's possible?

Best Answer

Simple way to getting service status in machine readable form:

systemctl show servicename --no-page

This command outputs data in key=value format:

Type=notify
Restart=always
NotifyAccess=main
...

If JSON format is required, you can use the following simple Python script (Python 2 and 3 compatible) get_service_info.py:

import os, sys, subprocess, json
key_value = subprocess.check_output(["systemctl", "show", sys.argv[1]], universal_newlines=True).split('\n')
json_dict = {}
for entry in key_value:
    kv = entry.split("=", 1)
    if len(kv) == 2:
        json_dict[kv[0]] = kv[1]
json.dump(json_dict, sys.stdout)

Usage:

get_service_info.py servicename
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