Example Linux Packer build VNC timeout and Failure to halt on interrupt

[tomjn]

While attempting to build the linux example to see what the output was I encountered an issue where it was waiting for VNC credentials that never arrived.

I tried to cancel the action via cmd+c and it printed cancelling build after recieving interrupt, but was frozen. I had to kill the process in activity monitor before packer could continue

packer-plugin-tart/example on  main 
❯ packer init ubuntu-22.04-vanilla.pkr.hcl 

packer-plugin-tart/example on  main 
❯ packer validate ubuntu-22.04-vanilla.pkr.hcl
The configuration is valid.

packer-plugin-tart/example on  main 
❯ packer build ubuntu-22.04-vanilla.pkr.hcl
tart-cli.tart: output will be in this color.

==> tart-cli.tart: Creating virtual machine...
==> tart-cli.tart: Starting the virtual machine for installation...
==> tart-cli.tart: Waiting for the VNC server credentials from Tart...
Cancelling build after receiving interrupt
Build 'tart-cli.tart' errored after 2 hours 13 minutes: unexpected EOF

==> Wait completed after 2 hours 13 minutes
Cleanly cancelled builds after being interrupted.

packer-plugin-tart/example on  main took 2h52m8s 
❯ 

[tomjn]

I suspect there's a missing step that isn't documented or assumed is too obvious to mention, possibly that I need ISO images that weren't mentioned? If that's the case then packer should have failed at an earlier step but doesn't, and I should still be able to cancel the build.

I already had issues trying to figure out what to do as using . resulted in lots of errors, I was only able to proceed by explicitly using the ubuntu HCL file