Packer SSH shell provisioner not triggering?

It appears that the SSH shell provisioner isn't triggering on my Fedora build on Tart which is almost identical to my build on x86_64 VirtualBox.

You can reproduce this like so

git clone https://github.com/HariSekhon/Packer-templates pack

cd pack

make fedora-tart-http

The output is:

...
Fedora ISOs prepared
pkill -9 -if -- '.*python.* -m http.server'
cd installers && python3 -m http.server &
packer build --force fedora-38-arm64.tart.http.pkr.hcl
Serving HTTP on :: port 8000 (http://[::]:8000/) ...
fedora-38.tart-cli.fedora-38: output will be in this color.

==> fedora-38.tart-cli.fedora-38: Creating virtual machine...
==> fedora-38.tart-cli.fedora-38: Starting the virtual machine for installation...
==> fedora-38.tart-cli.fedora-38: Waiting for the VNC server credentials from Tart...
==> fedora-38.tart-cli.fedora-38: Retrieved VNC credentials, connecting...
==> fedora-38.tart-cli.fedora-38: Connected to the VNC!
==> fedora-38.tart-cli.fedora-38: Typing the commands over VNC...
==> fedora-38.tart-cli.fedora-38: Waiting for the install process to shutdown the VM...

The Fedora prompt is up but the SSH provisioner never triggers, as verified by logging in and checking that the /etc/packer-version file created by my script never materializes, and the VM never shuts down to complete the build.

Those last 2 lines of the output are what makes me think that the SSH commands are not being run as when I got to tty2 to investigate there was no /etc/packer-version created by script and I can't see a hanging bash command it in the ps output (although it doesn't help that I have | pipe symbol to be able to less through the ps output).

cirruslabs / packer-plugin-tart

Packer SSH shell provisioner not triggering? #73