tests: Disable broken FCOS libvirt ignition test

FCOS installed via bootc install drops into emergency mode because the
partition layout (BIOS boot + EFI + root) lacks the "boot"-labeled
partition that coreos-boot-mount-generator expects. The 90-second device
wait for /dev/disk/by-label/boot times out, then SSHD never starts and
the root account is locked. Ignition itself is also skipped — bootc
install marks the disk as provisioned, so FCOS treats every boot as
"subsequent."

An analogous fix landed for the ephemeral/virtiofs case in
coreos/fedora-coreos-config#3859 but the
bootc-install-to-disk case is not yet handled upstream.

Disable the test registration (keeping the code) until the upstream
generator is fixed. The other ignition tests (invalid path, unsupported
image) still run and pass.

Assisted-by: OpenCode (Claude Opus 4)
Signed-off-by: Colin Walters <walters@verbum.org>

Author: cgwalters

crates/integration-tests/src/tests/libvirt_ignition.rs

@@ -25,11 +25,23 @@ fn random_suffix() -> String {
 /// Fedora CoreOS image that supports Ignition
 const FCOS_IMAGE: &str = "quay.io/fedora/fedora-coreos:stable";
 
-/// Test that Ignition config injection mechanism works for libvirt
+/// Test that Ignition config injection mechanism works end-to-end for libvirt.
 ///
-/// This test verifies that the Ignition config injection mechanism is working
-/// by checking that the VM can be created with --ignition flag and that the
-/// config file is properly stored.
+/// DISABLED: FCOS installed via `bootc install` drops into emergency mode
+/// because the partition layout (BIOS boot + EFI + root) lacks the separate
+/// "boot"-labeled partition that FCOS's `coreos-boot-mount-generator` expects.
+/// The 90-second device wait for `/dev/disk/by-label/boot` times out, SSHD
+/// never starts, and the root account is locked.  Additionally, Ignition
+/// itself is skipped — `bootc install` marks the disk as already provisioned,
+/// so FCOS treats every boot as "subsequent."
+///
+/// The upstream fix (extending `coreos-boot-mount-generator` to tolerate
+/// missing boot partitions for the `bootc install` case, analogous to the
+/// virtiofs fix in <https://github.com/coreos/fedora-coreos-config/pull/3859>)
+/// has not landed yet.  Re-enable this test once it does.
+///
+/// See also: <https://github.com/coreos/fedora-coreos-config/issues/400>
+#[allow(dead_code)]
 fn test_libvirt_ignition_works() -> TestResult {
     let sh = shell()?;
     let bck = get_bck_command()?;
@@ -86,7 +98,8 @@ fn test_libvirt_ignition_works() -> TestResult {
     println!("Ignition config injection test passed");
     Ok(())
 }
-integration_test!(test_libvirt_ignition_works);
+// DISABLED: see doc comment above for rationale and upstream links.
+// integration_test!(test_libvirt_ignition_works);
 
 /// Test that Ignition config validation rejects nonexistent files
 fn test_libvirt_ignition_invalid_path() -> TestResult {