Allow specifying content for vagrantfile_template

[flmmartins]

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Description

Today vagrantfile_template needs to be a file path.

Allow to specify vagrantfile_template_content in Vagrant post processor so I can use templatefile with it.

Use Case(s)

I want to specify my own SSH to be used in Vagrant instead of the public one therefore I would like to inject a vagrant with the following:

Vagrant.configure("2") do |config|
  config.ssh.private_key_path = ${my_ssh_key}
  config.ssh.forward_agent = true
end

This could be applied many configurations in the Vagrantfile. This is only an example.

Potential configuration

locals {
   vagrantfile = templatefile("vagrantfile.pkrtpl.hcl", { 
      my_ssh_key = "~/.ssh/rsa
    })
 }
 ....
 post-processor "vagrant" {
    vagrantfile_template_content = local.vagrantfile
 }  

Potential References

https://developer.hashicorp.com/packer/integrations/hashicorp/vagrant/latest/components/post-processor/vagrant

[lbajolet-hashicorp]

Hi @flmmartins,

Thanks for the suggestion, this is a Vagrant plugin specific issue so I'll transfer it to the plugin now.

This is likely simple to implement, would you be interested in contributing it potentially? We'd happily help if so, and review the code for certain!

[flmmartins]

Sure. I will see if I can propose a PR although I don't have experience with Go but it will be a good learning opportunity.

[lbajolet-hashicorp]

Awesome, thanks @flmmartins

Don't hesitate to reach out if you need some help, happy to provide!