I think I identified a bug in packer’s salt masterless provision, but I can’t figure out where the code is to submit a bug report/PR. There is GitHub - hashicorp/packer-plugin-salt: This Packer provisioner has been archived due to it no longer being maintained. Users are encouraged to use the shell or shell-local provisioner to run the provisioning tools made available by this plugin. If interested in maintaining this plugin please reach out to us at packer@hashicorp.com., but it is archived - not sure if it moved somewhere or what
HAH - the autofilled in the response. I am probably not interested in maintaining (doubt I have the time for it) but I am happy to submit a fix for this issue
BTW, for those who care, the issue went away when enabling TTY on the SSH channel