proxmox ve builds qcow2 images, which aren't compatible with proxmox

[stenwt]

Environment

• Make target: make build-proxmox-ubuntu-2404 (also tried 2204)
• Run using container image? (Y/N): tried both
• Environment vars:

PROXMOX_URL=my-url
PROXMOX_USERNAME=my-token-id
PROXMOX_TOKEN=my-token-secret
PROXMOX_NODE=my-node
PROXMOX_ISO_POOL=my-pool
PROXMOX_BRIDGE=my-bridge
PROXMOX_STORAGE_POOL=my-pool
PACKER_FLAGS="-var 'kubernetes_rpm_version=1.29.6' -var 'kubernetes_semver=v1.29.6' -var 'kubernetes_series=v1.29' -var 'kubernetes_deb_version=1.29.6-1.1'"

• Vars file:

What steps did you take and what happened?

Build fails, saying qcow2 image is incompatible

What did you expect to happen?

Build should use a compatible image format, and succeed

Relevant log output

Log Output

proxmox-iso.ubuntu-2404: output will be in this color.

==> proxmox-iso.ubuntu-2404: Retrieving ISO
==> proxmox-iso.ubuntu-2404: Trying https://releases.ubuntu.com/noble/ubuntu-24.04.1-live-server-amd64.iso
==> proxmox-iso.ubuntu-2404: Trying https://releases.ubuntu.com/noble/ubuntu-24.04.1-live-server-amd64.iso?checksum=sha256%3Ae240e4b801f7bb68c20d1356b60968ad0c33a41d00d828e74ceb3364a0317be9
    proxmox-iso.ubuntu-2404: ubuntu-24.04.1-live-server-amd64.iso 2.58 GiB / 2.58 GiB [==================================================================================] 100.00% 2m8s
==> proxmox-iso.ubuntu-2404: https://releases.ubuntu.com/noble/ubuntu-24.04.1-live-server-amd64.iso?checksum=sha256%3Ae240e4b801f7bb68c20d1356b60968ad0c33a41d00d828e74ceb3364a0317be9 => downloaded_iso_path/85d1bf86e5e0ecdd6e91515a63cc10bdab146dca.iso
    proxmox-iso.ubuntu-2404: Uploaded ISO to local:iso/85d1bf86e5e0ecdd6e91515a63cc10bdab146dca.iso
==> proxmox-iso.ubuntu-2404: Creating VM
==> proxmox-iso.ubuntu-2404: No VM ID given, getting next free from Proxmox
==> proxmox-iso.ubuntu-2404: Error creating VM: error creating VM: unable to create VM 105 - unsupported format 'qcow2' at /usr/share/perl5/PVE/Storage/LvmThinPlugin.pm line 87., error status:  (params: map[agent:1 cores:2 cpu:kvm64 description:Packer ephemeral build VM ide2:local:iso/85d1bf86e5e0ecdd6e91515a63cc10bdab146dca.iso,media=cdrom kvm:true memory:2048 name:packer-6745fe4d-30e7-59ba-70a3-c13347163274 net0:e1000=7A:97:06:E0:D9:6F,bridge=vmbr0 numa:false onboot:false ostype:other scsi0:local-lvm:20,cache=none,format=qcow2,replicate=0 scsihw:lsi sockets:2 tags: vmid:105])
Build 'proxmox-iso.ubuntu-2404' errored after 2 minutes 34 seconds: Error creating VM: error creating VM: unable to create VM 105 - unsupported format 'qcow2' at /usr/share/perl5/PVE/Storage/LvmThinPlugin.pm line 87., error status:  (params: map[agent:1 cores:2 cpu:kvm64 description:Packer ephemeral build VM ide2:local:iso/85d1bf86e5e0ecdd6e91515a63cc10bdab146dca.iso,media=cdrom kvm:true memory:2048 name:packer-6745fe4d-30e7-59ba-70a3-c13347163274 net0:e1000=7A:97:06:E0:D9:6F,bridge=vmbr0 numa:false onboot:false ostype:other scsi0:local-lvm:20,cache=none,format=qcow2,replicate=0 scsihw:lsi sockets:2 tags: vmid:105])

Anything else you would like to add?

it looks like this is was introduced in #1587 which was at least motivated by #1579 . from looking at proxmox docs, I don't think it should be expected for qcow2 images to work; raw did work when I attempted it

---

/kind bug