systemd: Updates for it to work with current paradigm

docs/Running-this-software.md

@@ -456,6 +456,34 @@ You should now have:
   with an example config override file if you didn't already have a
   `config.json` here.
 
+### Using systemd to run the live service
+`systemd/` contains two systemd unit files to enable starting the services
+via system, including at boot time.
+
+1. `systemd/eddn@.service` - a systemd template unit file that can be used
+  to start/stop any of the EDDN services **in the live environment**.
+  You would invoke it like:
+
+    `systemctl start eddn@eddn-gateway.service`
+
+1. `systemd/eddn.target` - a system target until file which will start all
+  of:
+
+    ```
+    eddn@eddn-relay.service
+    eddn@eddn-monitor.service
+    eddn@eddn-gateway.service
+    ```
+To get them working:
+
+  1. copy both files into `/etc/systemd/system/`.
+
+  1. Enable the target and services:
+    1. `systemctl enable eddn.target`
+    1. `systemctl enable eddn@eddn-gateway.service`
+    1. `systemctl enable eddn@eddn-monitor.service`
+    1. `systemctl enable eddn@eddn-relay.service`
+
 ### Post-installation steps
 If you're not using the `live` environment then there are some edits you
 need to make.

systemd/eddn.target

@@ -1,6 +1,6 @@
 [Unit]
 Description=EDDN Services
-Requires=eddn@eddn-relay.service eddn@eddn-monitor.service eddn@eddn-gateway.service
+Requires=eddn@relay.service eddn@monitor.service eddn@gateway.service
 
 [Install]
 WantedBy=multi-user.target

systemd/eddn@.service

@@ -7,7 +7,7 @@
 
 [Unit]
 Description=EDDN Service %i
-AssertPathExists=/home/eddn/eddn/python-venv/bin/%i
+AssertPathExists=/home/eddn/live/python-venv/bin/eddn-%i
 PartOf=eddn.service
 ReloadPropagatedFrom=eddn.service
 Before=eddn.service
@@ -18,7 +18,7 @@ After=network.target
 Type=simple
 User=eddn
 Group=eddn
-ExecStart=/home/eddn/.local/bin/start-eddn-service %i
+ExecStart=/home/eddn/.local/bin/start-eddn-live-service live %i
 TimeoutStartSec=10s
 TimeoutStopSec=10s
 SyslogIdentifier=eddn@%i