Shell Provisioner AWS EC2 Mac not escaping $() ${}

[gurfink]

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Overview of the Issue

Building a Mac AWS EC2 AMI and utilising provisioner inline shell to create an instance start up script that when run on init of the instance will automate start up of a few things and access the instance Meta Data service to get an instance tag value to configure something, e.g;

provisioner "shell" { inline = [ "sudo cat > /usr/local/aws/suncorp/startup.sh <<EOF", "#!/bin/bash", "instanceid=$$(curl -s http://169.254.169.254/latest/meta-data/instance-id)" "EOF" ]}

The translation/escape of the $$ ends up being translated as a number instead of $, e.g;
instanceid=604(curl -s http://169.254.169.254/latest/meta-data/instance-id)

I've tried both bash and zsh as I know shells cause issue on escapes in ubuntu.

Reproduction Steps

Attempt to escape '$' character in inline provisioner shell create an Amazon Mac instance type (mac1.metal or mac2.metal) as per overview. The escaping of the '$' ends up becoming a numeric value.

Packer version

1.9.4

Operating system and Environment details

AWS Mac EC2 instances

[github-actions]

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