Create a Fedora CoreOS VM from an xz compressed cloud image

[webD97]

I'm currently using this provider (great work btw!) to set up a homelab k3s cluster. My nodes are running Fedora CoreOS and I'd like to bootstrap the VMs from the official qcow2 image.

I followed the Create a VM from a Cloud Image but unfortunately Proxmox does not seem to like the fact that CoreOS images are only available with xz compression (https://fedoraproject.org/coreos/download?stream=stable&arch=x86_64#baremetal), so this fails:

resource "proxmox_virtual_environment_download_file" "coreos_qcow2" {
  content_type = "iso"
  datastore_id = "local"
  node_name    = "pve"
  url          = "https://builds.coreos.fedoraproject.org/prod/streams/stable/builds/39.20240322.3.1/x86_64/fedora-coreos-39.20240322.3.1-qemu.x86_64.qcow2.xz"
}

Could not download file 'fedora-coreos-39.20240322.3.1-qemu.x86_64.qcow2.xz', unexpected error: error download file by URL: received an HTTP 400 response - Reason: Parameter verification failed. (filename: wrong file extension)

I'm pretty sure this is a Proxmox limitation but maybe I am just missing something and someone has a better approach. My best idea so far is to create some local-exec magic that invokes coreos-downloader to create the uncompressed qcow2 locally, which is then used in a proxmox_virtual_environment_file, but that appears to be more a hack than a workaround.

Any ideas?

[bpg]

Hi @webD97 👋🏼

I don't think Proxmox can use xz-compressed qcow2 disk images for VMs. Your idea about the local-exec approach is probably the best we can do to automate this atm.

[webD97]

I really hoped that I missed some feature - but it is as it is (at least for now). Thank you for you input!