vagrant post-processor does not export additional disks from qemu

[ghost]

This issue was originally opened by @rgl as hashicorp/packer#9160. It was migrated here as a result of the Packer plugin split. The original body of the issue is below.

---

Overview of the Issue

#7791/#6139 introduced the disk_additional_size property to add additional disks to a qemu vm and that works nicely, but the vagrant post-processor is not exporting the additional disks:

$ tar tvf esxi-7.0-amd64-libvirt.box
-rw-rw-r-- rgl/rgl         814 2020-05-03 22:31 Vagrantfile
-rw-rw-r-- rgl/rgl   561774592 2020-05-03 22:31 box.img
-rw-rw-r-- rgl/rgl          57 2020-05-03 22:31 metadata.json

Packer version

1.5.6

Simplified Packer Buildfile

  "builders": [
    {
      "name": "esxi-{{user `version`}}-amd64-libvirt",
      "type": "qemu",
      "disk_size": "{{user `boot_disk_size`}}",
      "disk_additional_size": ["{{user `datastore_disk_size`}}"],
      ...

The full template is at https://github.com/rgl/esxi-vagrant/blob/feature-upgrade-to-esxi-7/esxi.json

[rubenst2013]

same issue here. At least I got the additional disk files over using the include directive. Now I need to keep them attached.

Edit: I'm using packer v1.7.7

[rubenst2013]

I got a bit further.

• In my packer hcl I specify the additional disks using the include directive, like so:

post-processor "vagrant" {
    output = "builds/virtualbox-ubuntu-2104-${var.version}-${var.build_number}-${var.branch_name}.box"
    # keep vm around for analysis
    keep_input_artifact = true
    # hacky include to transfer additional disks into the vagrant .box
    # format: "output-<source name>/<filename>"
    include = [
        "output-ubuntu_server_21_04_qemu/packer-ubuntu-2104-0.1.0-b04-master-1",
        "output-ubuntu_server_21_04_qemu/packer-ubuntu-2104-0.1.0-b04-master-2",
        "output-ubuntu_server_21_04_qemu/packer-ubuntu-2104-0.1.0-b04-master-3",
        "output-ubuntu_server_21_04_qemu/packer-ubuntu-2104-0.1.0-b04-master-4",
    ]  
  }

• Then I import the box
• Edit the box's metadata.json like so: (the file is in ~/.vagrant.d/boxes/<nameOfBox>/0/libvirt/metadata.json)

{
  "format" : "qcow2",
  "provider" : "libvirt",
  "disks" : [
    {
      "path" : "box.img"
    },
    {
      "path" : "packer-ubuntu-2104-0.1.0-b04-master-1.img"
    },
    {
      "path" : "packer-ubuntu-2104-0.1.0-b04-master-2.img"
    },
    {
      "path" : "packer-ubuntu-2104-0.1.0-b04-master-3.img"
    },
    {
      "path" : "packer-ubuntu-2104-0.1.0-b04-master-4.img"
    }
  ]
}

Note I replaced the "virtualsize" entry with a "disks" array. With that the VM now loaded the disks, BUUUUT the UUIDs of the physical volumes I use for LVM were different. I had to manually adjust them :/