[NIFI-11785] Allow passing environment variables in install script

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 1.22.0
• Component/s: Configuration
• Labels: config environment install
• Assignee: Unassigned
• Reporter: Sander Bylemans
• Created: 07/Jul/23 12:23
• Updated: 07/Jul/23 12:23

Description

In order to connect to an SFTP, we included configuration of that in a file with environment variables for the VM that runs nifi. We use scripts to configure the vm, and these scripts source that file.

I know we can access environment variables in nifi using EL, but we don't have a way to pass these environment variables to the service definition. There should be an option in the `nifi.sh install `command, something like `nifi.sh install -e URL=https://example.com` which then includes this env var in the service definition.