Impl-2b: resolve a raw candidate's fs-UUID via /disks/candidates (enroll fix)

runStorageInit/runStorageAttach resolved the fs UUID only via agent.Disks(),
which does NOT include a raw (unenrolled, non-PVE-storage) device — so a raw
candidate could be offered but never enrolled ("no fs identifier"). New
resolveEnrollUUID falls back to the raw-device scan (/disks/candidates), which
reports each free disk's durable_id (uuid:<fs-uuid>). Both enroll paths use it;
legacy re-attach (drive in /disks) still works. Test + red-proof.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

controller/internal/web/storage_handlers.go

@@ -29,6 +29,7 @@ import (
 // without a live agent). *agentapi.Client satisfies it.
 type diskAgent interface {
 	Disks(ctx context.Context) (agentapi.DisksResponse, error)
+	ListCandidates(ctx context.Context) (agentapi.CandidatesResult, error)
 	FormatDisk(ctx context.Context, device, fstype string, confirmed bool, durableID string) (agentapi.FormatResult, error)
 	AssignDisk(ctx context.Context, uuid, where, fstype, options string) error
 	EjectDisk(ctx context.Context, where string) (agentapi.EjectResult, error)
@@ -63,6 +64,31 @@ func fsUUIDForDevice(disks agentapi.DisksResponse, device string) string {
 	return ""
 }
 
+// resolveEnrollUUID resolves a device's filesystem UUID for enrollment. A RAW candidate (Impl-2b) is
+// NOT in the /disks list (it has no PVE storage / isn't enrolled), so fsUUIDForDevice can't see it —
+// fall back to the raw-device scan (/disks/candidates), which reports each free disk's durable_id
+// (uuid:<fs-uuid>). Matches the whole disk OR its FS-bearing node (mount_source, e.g. /dev/sdd1).
+// Returns "" only if the device truly has no resolvable fs UUID.
+func resolveEnrollUUID(ctx context.Context, agent diskAgent, device string) string {
+	if disks, err := agent.Disks(ctx); err == nil {
+		if u := fsUUIDForDevice(disks, device); u != "" {
+			return u
+		}
+	}
+	cands, err := agent.ListCandidates(ctx)
+	if err != nil {
+		return ""
+	}
+	for _, c := range append(append([]agentapi.DiskCandidate{}, cands.Initialize...), cands.Attach...) {
+		if c.Device == device || c.MountSource == device {
+			if rest, ok := strings.CutPrefix(c.DurableID, "uuid:"); ok {
+				return rest
+			}
+		}
+	}
+	return ""
+}
+
 // storageInitResult is the outcome of an init attempt (JSON-rendered to the wizard).
 type storageInitResult struct {
 	Registered bool   `json:"registered"`
@@ -107,12 +133,9 @@ func (s *Server) runStorageInit(ctx context.Context, agent diskAgent, device, fs
 	if !fr.Formatted {
 		return storageInitResult{}, fmt.Errorf("az eszköz nem lett megformázva (%s)", fr.Reason)
 	}
-	// 2. Resolve the NEW fs UUID (re-list disks; the device's storage now carries a fresh UUID).
-	disks, err := agent.Disks(ctx)
-	if err != nil {
-		return storageInitResult{}, fmt.Errorf("formázás kész, de a meghajtólista nem olvasható: %w", err)
-	}
-	uuid := fsUUIDForDevice(disks, device)
+	// 2. Resolve the NEW fs UUID. A freshly-formatted RAW device isn't in /disks (not enrolled yet), so
+	// resolve via the raw-device scan too (Impl-2b) — the device now appears there with its new durable_id.
+	uuid := resolveEnrollUUID(ctx, agent, device)
 	if uuid == "" {
 		return storageInitResult{}, fmt.Errorf("formázás kész, de az új fájlrendszer-azonosító nem feloldható — frissítsen és használja a Csatolás funkciót")
 	}
@@ -145,11 +168,9 @@ func (s *Server) attachIntoGuest(ctx context.Context, agent diskAgent, where str
 // runStorageAttach mounts an existing-filesystem device (non-destructive — never touches the gate)
 // and registers it. The UUID is resolved server-side from the device.
 func (s *Server) runStorageAttach(ctx context.Context, agent diskAgent, device, fstype, where, label string, setDefault bool) (storageInitResult, error) {
-	disks, err := agent.Disks(ctx)
-	if err != nil {
-		return storageInitResult{}, fmt.Errorf("a meghajtólista nem olvasható: %w", err)
-	}
-	uuid := fsUUIDForDevice(disks, device)
+	// Resolve the fs UUID. Works for a legacy re-attach (drive in /disks) AND a raw candidate (Impl-2b:
+	// not in /disks — resolved via the raw-device scan's durable_id).
+	uuid := resolveEnrollUUID(ctx, agent, device)
 	if uuid == "" {
 		return storageInitResult{}, fmt.Errorf("a kiválasztott meghajtóhoz nem található fájlrendszer-azonosító (csak fájlrendszerrel rendelkező meghajtó csatolható)")
 	}

controller/internal/web/storage_handlers_test.go

@@ -42,6 +42,7 @@ type mockAgent struct {
 	decommissionCalls []string
 	guestRebootCalls  int
 	guestRebootErr    error
+	candidates        agentapi.CandidatesResult
 }
 
 type assignCall struct{ uuid, where, fstype string }
@@ -54,6 +55,10 @@ func (m *mockAgent) Disks(context.Context) (agentapi.DisksResponse, error) {
 	m.disksCalls++
 	return m.disks, nil
 }
+
+func (m *mockAgent) ListCandidates(context.Context) (agentapi.CandidatesResult, error) {
+	return m.candidates, nil
+}
 func (m *mockAgent) FormatDisk(_ context.Context, device, fstype string, confirmed bool, durableID string) (agentapi.FormatResult, error) {
 	m.formatCalls = append(m.formatCalls, formatCall{device, fstype, durableID, confirmed})
 	return m.formatRes, m.formatErr
@@ -219,6 +224,31 @@ func TestRunStorageAttach_Success(t *testing.T) {
 	}
 }
 
+// Impl-2b: a RAW candidate (not in /disks — no PVE storage) attaches by resolving its fs UUID from the
+// raw-device scan's durable_id. RED-PROOF: with the old fsUUIDForDevice(Disks)-only resolution this
+// fails ("no fs identifier"), since the raw device is absent from /disks.
+func TestRunStorageAttach_RawCandidate(t *testing.T) {
+	s := testServer(t)
+	agent := &mockAgent{
+		disks: agentapi.DisksResponse{Disks: []agentapi.DiskInfo{}}, // raw device NOT in /disks
+		candidates: agentapi.CandidatesResult{
+			Attach: []agentapi.DiskCandidate{
+				{Device: "/dev/sdd", FSType: "ext4", Mountable: true, MountSource: "/dev/sdd", DurableID: "uuid:RAW-99"},
+			},
+		},
+	}
+	res, err := s.runStorageAttach(context.Background(), agent, "/dev/sdd", "ext4", "/mnt/teszt", "Teszt", false)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if !res.Registered {
+		t.Fatal("expected registered")
+	}
+	if len(agent.assignCalls) != 1 || agent.assignCalls[0].uuid != "RAW-99" {
+		t.Fatalf("raw candidate must assign by the scan-derived fs UUID: %+v", agent.assignCalls)
+	}
+}
+
 // handleStorageRegister (the "Regisztrálás" action for an already-mounted, unregistered drive) must
 // register the STABLE intermediary path /mnt/felhom-drives/<name> — the same path runStorageInit/
 // runStorageAttach register — NOT the raw /mnt/<name> it receives. Registering the raw path made the