Boot RHCOS 4.1 and rebase to RHCOS 9.6

README.md

1. Download RHCOS 4.1 from the RHCOS release browser (qemu qcow2) or the mirror (metal BIOS or UEFI image).
2. Write a spec v2 Ignition config that sets the password for core to e.g. changeme:

{
  "ignition": {
    "config": {},
    "security": {
      "tls": {}
    },
    "timeouts": {},
    "version": "2.2.0"
  },
  "passwd": {
    "users": [
      {
        "name": "core",
        "groups": [
          "sudo",
          "wheel"
        ],
        "passwordHash": "$6$QoJFNpDLghwtyeZV$dINZU8AH.2Q/wfFF9HbVKg9zZ7AFUagaCZO.n/Ma19y8mhbmXZydKXRJy7L9WsVRBKySnBJp3dq7UmcgIlx2u."
      }
    ]
  }
}

3. Boot it using kola qemuexec --qemu-image image.qcow2 --ignition-direct -i config.ign -U. Log in using core/changeme.
   • For the metal images, you can just pass the .raw file directly to the --qemu-image field. You'll also want to add --kargs ignition.platform.id=qemu.
   • For the UEFI metal image, additionally pass --qemu-firmware uefi.
4. Rebase the guest using the same deploy-from-self trick that the MCO uses:

setenforce 0
IMG=localhost/rhel-9.6
podman run --privileged --pid=host --net=host --rm -v /:/run/host $IMG rpm-ostree ex deploy-from-self /run/host

(The IMG there is normally e.g. the latest RHCOS 9.6 pullspec. But if you're using a locally built rhel-9.6 anyway, it might be easier to just e.g. curl down the OCI archive from the host and then skopeo copy it into container storage in the guest.)