Use a OS variable

[pvanklink]

I like to use a os variable in my flow, the hostname.

So i added a line in (top) of settings.js
(Nodered is installed as a docker container on a rpi 4b, with the latest image/container of NR)
process.env.hostname = require('os').hostname();

in my flow i use
var theHost = global.get('env').hostname();
msg.payload = theHost;

and get: TypeError: Cannot read property 'hostname' of undefined

I also tried

var theHost = global.get('env');
msg.payload = theHost.hostname;

same problem

[E1cid]

Would in not be var theHost = env.get("hostname")?
https://nodered.org/docs/user-guide/environment-variables

[pvklink]

@E1cid

var theHost = env.get("hostname") ?

Tried this (no os var but a self decalred var
//added to top settings.js --> process.env.MY_ENV_VAR = "Hello World";

var theHost = env.get("MY_ENV_VAR")
msg.test=theHost;

return msg;

but no hello world, but strange content

return msg;

[pvklink]

@pvklink

env.get("MY_ENV_VAR")

@update:

Almost there!
Added this in settings.js
process.env.MY_ENV_VAR = "Hello World";

functionGlobalContext: {
env:process.env
},

and in the flow inject node i did:
msg.payload = global.env.MY_ENV_VAR

[knolleary]

@pvklink

Tried this (no os var but a self decalred var
//added to top settings.js --> process.env.MY_ENV_VAR = "Hello World";

var theHost = env.get("MY_ENV_VAR")
msg.test=theHost;

return msg;

That should work - env.get(...) eventually does look up from process.env.

Did you remember to restart Node-RED after editing your settings file?

[pvklink]

yes i did, stopped and restarted the docker...