Passing parameters to shell_command

[SteveDinn]

I’ve written a small wrapper script that calls decode-config.py that backs up a TASMOTA device’s configuration. I’d like to be able to call it from a shell_command while passing a few parameters to it to target a specific device.

When I call this:

shell_command:
  tasmota_backup: '/srv/hass/bin/python "/home/hass/config/python_scripts/tasmota_backup.py"  "{{ ip_address }}" "{{ mac_address }}" "{{ friendly_name }}" "{{ tasmota_username }}" "{{ tasmota_password }}"'

like this

       - service: shell_command.tasmota_backup
         data_template:
           ip_address: >
             {%- set device_name = trigger.topic.split('/')[1] -%}
             {{ state_attr('sensor.tasmota_' + (device_name | lower), 'ip_address') }}
           mac_address: >
             {%- set device_name = trigger.topic.split('/')[1] -%}
             {{ state_attr('sensor.tasmota_' + (device_name | lower), 'mac_address') }}
           friendly_name: >
             {%- set device_name = trigger.topic.split('/')[1] -%}
             {{ state_attr('sensor.tasmota_' + (device_name | lower), 'friendly_name') }}
           tasmota_username: !secret tasmota_username
           tasmota_password: !secret tasmota_password

I can see in the debug log that all the parameters are passed exactly as they are in the shell_command. I.e., the templates are not interpreted. The documentation says this:

The commands can be dynamic, using templates to insert values for arguments. When using templates, shell_command runs in a more secure environment which doesn’t allow any shell helpers like automatically expanding the home dir ~ or using pipe symbols to run multiple commands. Similarly, only content after the first space can be generated by a template. This means the command name itself cannot be generated by a template, but it must be literally provided.

Any service data passed into the service call to activate the shell command will be available as a variable within the template.

I think I’m doing it right, but it seems to not work as intended.