Exec node unable to launch service

General
1

Hi guys, from previous issues, im trying to run a ffmpeg command as a service...
If I execute from command line, it works like a charm:

pi@pi2:~ $ systemctl --user start myscript

But, when I execute it from exec node I got:

Failed to connect to bus: No existe el fichero o el directorio

the flow:

[{"id":"9e05b5cf.bce038","type":"exec","z":"bcea7856.3d9df8","command":"systemctl --user start myservice","addpay":false,"append":"","useSpawn":"false","timer":"","oldrc":false,"name":"ffmpeg","x":420,"y":120,"wires":[["ce60718c.630bf"],["ce60718c.630bf"],["ce60718c.630bf"]]},{"id":"72214724.8e5f18","type":"inject","z":"bcea7856.3d9df8","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"","payloadType":"date","x":160,"y":120,"wires":[["9e05b5cf.bce038"]]},{"id":"ce60718c.630bf","type":"debug","z":"bcea7856.3d9df8","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":760,"y":120,"wires":[]}]

I've read across lots of linux forums and its seems its a issue related to enviroments variables like XDG_RUNTIME_DIR or something.

Would somebody give me any clue about the issue and how to solve it? thx :wink:

2

When you are at the command line, run the command set. This will show you all of the environment variables you get from a standard command prompt. Now run the same command from an exec node and compare the two outputs.

In fact, I assign process.env to a global variable in my settings.js so that I have them all to hand when working with Node-RED (though note that you shouldn't do this if running in a shared environment as there can be quite sensitive things kept as environment variables). However, also note that the result of a set in an exec node might not be quite the same.

Now you can add the variables you need to the exec command you are running.

1 Like
3

Now I hadded ${XDG_RUNTIME_DIR} environment variable. And the error has changed to:

Failed to start myservice.service: Unit myservice.service not found.

Maybe other variables are needed, but I doesnt know witch of them.

4

Does it say exactly that or have you changed the actual name?
Where have you put the service file?

5

Hi @Colin,
Says exactly this, the script is located here (added 777 permissions temporally):

/home/pi/.config/systemd/user/myscript.service

When I run it from command line it works, these make me assume that the service is properly configured.

6

You have got the name wrong. You are trying to start myservice, but it is called myscript.

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7

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