Child_process.exec [deginner need help]

General
1

Hi all,
I would like to make a button in the dashboard to execute a script. This script updates Node-Red like this:
bash <(curl -sL https://raw.githubusercontent.com/node-red/linux-installers/master/deb/update-nodejs-and-nodered)

In this previous post @TotallyInformation suggests that I use an exec node which will create a shell which can execute what I want with chil_process.exec.

The problem is that I am completely new to programming and I do not see how to write this script.
Can you help me ?
Thanks
Chris

2

Start here, there are a lot of resources on-line:

https://linuxconfig.org/bash-scripting-tutorial-for-beginners

Your "environment" is not inherited when you use an exec node so you need to use the full path to the curl command. On my system its /usr/bin/curl

3

Will that work, doesn't it need to be run in terminal so that you can enter the password when required. Or are your systems setup so as not to need a password for sudo?
Even then I am not certain it will work without a terminal session.

4

Apart from the comments from @Colin, which are relevant, why do you want to update node-red this way? The biggest problem I see is that you wouldn't see installation errors, if they occur.

5

the goal is to display on the Dashboard if a new version of NR is available online :

and if there is one, be able to update always from the Dashboard by clicking on a button which executes the update command or script.
Indeed, we do not see the errors but it avoids connecting to ssh and typing in the terminal to the update command.

6

If it is just node-red that you want to update then you could run directly using an exec node
sudo npm install -g --unsafe-perm node-red
and then force a node-red restart or a reboot.

Edit - corrected command above.

1 Like
7

it works, it does the job thanks for the help.

8

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