Execute a Shellscript (as root) when pressing a button in the sitemap

Add-ons Bindings
1

Hi,
I try to add a Button in my sitemap which run a simple Shell script on local Raspberry when the button is pressed. The script must run as user “root”, so a ‘sudo …’ must be added (or I have to add this part in the shell script).

(The EXEC binding is installed in oH)

I’m not shure, must I create a rule to realize this?

2

Checkout this topic. It does a restart of openHAB, but you can modify that solution to run your shell script instead.

3

Looks like you duplicated your question.
https://community.openhab.org/t/only-execute-a-shellscript-as-root-when-pressing-a-button-in-a-oh-sitemap/74939

4

Thanks for the link.

The sudoers - part I will check later, actual I’m standing on the line …

Thing exec:command:openhab_restart [command=“sudo /bin/systemctl restart openhab2.service”, interval=0, autorun=true]

Where have I to add it? In a rule? Didn’d I need to configure it in an item-file?

I want a button on a sub-screen to execute the shell-action.

5

Let’s step back. You would be well served to review the concepts section of the Docs because your question belies a lack of understanding of the important concepts that make up openHAB and how they work together.

You need to:

  1. Create an Exec binding Thing
  2. Create one or more Items associated linked to the Channel(s) of the Thing
  3. Add the correct Item to your sitemap.
6

The sudo part is kind of essential in this solution. Without it, it will not work because openHAB would need to provide a password to execute the script which cannot be done. Hence, you need to configure the OS such that it knows that it does not require a password when the openhab user uses sudo to execute your script.

The Thing goes into a *.things file.

Thing exec:command:openhab_restart [command=“sudo /bin/systemctl restart openhab2.service”, interval=0, autorun=true]

The switch Item to trigger the script goes into an *.items file.

Switch openhab_restart "Restart Openhab" {channel="exec:command:openhab_restart:run"}

The button you want to show on your Sitemap should be defined in a *.sitemap file.

sitemap demo label="Your Value"
{
        Frame {
            Switch item=openhab_restart
        }
}

Later you may want to provide a button in HABPanel as well, but it is easier to first get it to work using a sitemap.

Be sure to also checkout the docs from the exec-binding. It contains examples (unfortunately not using sudo) and more information about other channels made available by the exec-binding, e.g. how to get the output of the executed script.

1 Like
7

So,
this is working now,
a “Switch” is executing a script which runs under user “root” !

But my "Switch should not a “switch”, should be more a “Push button” (not be “ON” after “clicking”.
(or going in state “off” after 2 seconds, but how? . New rule?)

At the end I have 4 different scripts which should be started, so I think a bether solution is to use one “button” with 4 options instead for single switches.
In a sitemap I have this for a rollershuter (and lamps), to select a specific value with pressing the wanted selection. See example-picture.lamp_0-3

But this switch should be not in the sitmap, must be in sub-screen.

Actuall I put this single switch (in your example “openhab_restart”) in my “gVswitches” group.
Is it possible to create a switch with 4 selections (and every selection start a different script, maybe with a case-part in a rule (case: 1=start-script1; 2=start-script-2, …))

Also after pressing one from the (4) options, the value must/should not be stored and shown as “active” (pressed) in the display: all 4 options should be going into state “inactive” (Off).

And Rich, you are right, I try do understand more and more in oH … learning with examples like these are very good! My problem was the “Virtual” action, because I had no physical item to send a value, now I see: I can use a channel-binding to execute a shell-script.

8

I’m currently at work, so I can’t provide you with a full answer.

Fixing the button to stay off should be easy to accomplish adding the autoupdate parameter to your item and setting it to false (although I have never used it with a channel before, only with a binding as show in the documentation).

Switch openhab_restart "Restart Openhab" {channel="exec:command:openhab_restart:run", autoupdate="false"}
9

Parameter autoupdate=“false” works as you expected, thanks! Switch is going to “off” again after pressing.
(I only had to install the RegEx-Transformation, this is needed for this parameter (?!))

My other question (push-button with 4 selections to start 4 different scripts) is still waiting for help (maybe you have later an ideo), or others …

10

Create a Number Item or a String Item.

Put that Item on the Sitemap as a Switch with a Mappings. See https://www.openhab.org/docs/configuration/sitemaps.html#mappings

You will then need a Rule to trigger and send the command to the right Switch linked to the script.

11

In a sitemap, OK, I think I know how I can do this, have already similar “Buttons” there with 3 or 4 selections (rollershutter, lamp).

Is it possible to use a mapping in a items, because the Number is created in cam.items like:


Number cam_select
  "cam to start"
  (gVswitches)

But here it seems a …mapping … is not allowed.

How can I get this 4-selection-button in the group gVswitches to display?

12

You can only define a mappings in the sitemap.

You can’t use a mappings on the sitemap for an Items put on the sitemap using a Group element.