I have this in "variables" in my main template.
"variables": {
      "Build_with_ami": "",
}


I have this in "builders" of my main template: 
"type": "amazon-ebs",
"source_ami": "{{user `Build_with_ami`}}",


If I use packer -var 'Build_with_ami=ami-whatever' it works fine.

If, however, I put this in a varfile:

{
  "build_with_ami": "ami-whatever",
 }

and use -var-file 'variablefile.json'

Packer errors saying I must specify source_ami.

I have also tried using "source_ami" directly.

I have also tried removing it from the variables section in the template 
(but retaining the variables section itself.

I have tried -var-file='variablefile.json'

FYI -var-file=variablefile.json has the extension stripped off it when 
executing under powershell.

The only way Build_with_ami is recognized is if I set it on the command 
line or directly in the template "variables" section.

The log file does not show variables nor where they are read from - would 
be nice for debugging this.

All of the above is under PowerShell 5.0

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