The internal data place, partitions as places, add_internal_place (felhom.eu architecture/16 §5-§7, §9; build B)

- internal place: the record /var/lib/felhom-agent/internal-place.json -> mounted at /mnt/belso by fs-UUID like an
  enrolled drive (startup + 20 s tick), kind "internal" in GET /disks; never takes a household drive's /mnt/belso;
  eject/decommission/format refused (dm on the system disk).
- configs/felhom-internal-place: the ruled size rule and the only lvcreate/mkfs of a system-disk volume (installer +
  the new signed op add_internal_place, operator key, no parameters).
- partitions listed per free disk (empty / filesystem / in_use); a data-bearing part's wipe id binds disk id + part
  number + fs-UUID.
- felhom-mkfs-guarded: Felhom's own sibling drive no longer blocks formatting the free part; an unlistable disk refuses.
Tests red-proved (script mutations, Go mutations, the old wrapper measured against the new tests).

Claude-Session: https://claude.ai/code/session_012qRErfCoiTkvDK9N5XHbzb

internal/localapi/internalplace.go

@@ -0,0 +1,207 @@
+package localapi
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"os"
+	"path"
+	"path/filepath"
+	"regexp"
+	"sync"
+	"time"
+
+	"gitea.dooplex.hu/admin/felhom-agent/internal/storage"
+)
+
+// The internal data place („Belső tárhely", agent v0.158.0) — felhom.eu architecture/16-storage-physical-identity.md
+// §5, §7. On a one-disk box the root helper configs/felhom-internal-place makes a second thin volume in local-lvm
+// (<vg>/felhom-belso, ext4, label felhom-belso). The installer (a new box) or the signed add_internal_place job (an old
+// box) then writes InternalPlaceRecord to the agent's state dir. From then on the agent treats the volume exactly like
+// an enrolled drive: a Felhom mount unit by fs-UUID at /mnt/belso (EnsureMount), the `enrolled` intent, and — when the
+// controller asks with its own token (POST /disks/guest-attach) — the bind at /mnt/felhom-drives/belso. So it is a
+// HOST mount under the guest's mp8 parent: not in the guest config, not in vzdump, not in PBS (`16` §5).
+//
+// What it is NOT: a drive the household can format, wipe, eject or decommission. Its device is a device-mapper volume
+// on the system disk, so the role gate (roleForMountPath → system) and the format path (ValidateBlockDevice refuses
+// dm) refuse all four — pinned by internalplace_test.go. Its identity is the system disk's (build A), so a Tier-2 copy
+// between it and sys_drive is never a second copy.
+const (
+	InternalPlaceName  = "belso"
+	InternalPlaceWhere = "/mnt/belso"
+	// InternalPlaceFile is the record's name inside the agent's state dir.
+	InternalPlaceFile = "internal-place.json"
+)
+
+var reFSUUID = regexp.MustCompile(`^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}$`)
+
+// InternalPlaceRecord is the state file the maker writes once the volume exists and is formatted.
+type InternalPlaceRecord struct {
+	FSUUID string `json:"fs_uuid"`
+	GiB    int    `json:"gib,omitempty"`
+	MadeBy string `json:"made_by,omitempty"` // "installer" | "signed-job"
+	MadeAt string `json:"made_at,omitempty"`
+}
+
+// ReadInternalPlace reads the record; ok=false when there is none (the common case: a box with no internal place).
+func ReadInternalPlace(file string) (InternalPlaceRecord, bool, error) {
+	var rec InternalPlaceRecord
+	b, err := os.ReadFile(file)
+	if errors.Is(err, os.ErrNotExist) {
+		return rec, false, nil
+	}
+	if err != nil {
+		return rec, false, err
+	}
+	if err := json.Unmarshal(b, &rec); err != nil {
+		return rec, false, fmt.Errorf("internal place record %s: %w", file, err)
+	}
+	if !reFSUUID.MatchString(rec.FSUUID) {
+		return rec, false, fmt.Errorf("internal place record %s: fs_uuid %q is not a filesystem UUID", file, rec.FSUUID)
+	}
+	return rec, true, nil
+}
+
+// WriteInternalPlace writes the record atomically (0600).
+func WriteInternalPlace(file string, rec InternalPlaceRecord) error {
+	if !reFSUUID.MatchString(rec.FSUUID) {
+		return fmt.Errorf("internal place: fs_uuid %q is not a filesystem UUID", rec.FSUUID)
+	}
+	b, err := json.MarshalIndent(rec, "", "  ")
+	if err != nil {
+		return err
+	}
+	tmp := file + ".tmp"
+	if err := os.WriteFile(tmp, append(b, '\n'), 0o600); err != nil {
+		return err
+	}
+	return os.Rename(tmp, file)
+}
+
+// internalPlaceState memoises what EnsureInternalPlace last saw, so the 20-second tick logs a state CHANGE once and
+// does no work on the steady state.
+type internalPlaceState struct {
+	mu      sync.Mutex
+	done    string // the fs-UUID that is mounted and recorded enrolled
+	lastWhy string // the last reason it could not be ensured (logged once per change)
+}
+
+// internalPlaceUUID returns the configured internal place's fs-UUID, or "" when this box has none (or the record is
+// unreadable — logged by EnsureInternalPlace).
+func (s *Server) internalPlaceUUID() string {
+	if s.internalPlaceFile == "" {
+		return ""
+	}
+	rec, ok, err := ReadInternalPlace(s.internalPlaceFile)
+	if err != nil || !ok {
+		return ""
+	}
+	return rec.FSUUID
+}
+
+// isInternalPlace reports whether a host path is this box's internal place: its raw mount (/mnt/belso) or its bind
+// under the guests' shared parent (/mnt/felhom-drives/belso — the path POST /disks/same-disk judges).
+func (s *Server) isInternalPlace(hostPath string) bool {
+	p := path.Clean(hostPath)
+	return (p == InternalPlaceWhere || p == StableParentDir+"/"+InternalPlaceName) && s.internalPlaceUUID() != ""
+}
+
+// EnsureInternalPlace mounts the internal place on the host at /mnt/belso by fs-UUID and records it `enrolled`,
+// when this box has one. Idempotent and cheap on the steady state; safe on the 20-second tick. It never formats,
+// never unmounts, and never mounts anything at /mnt/belso that is not the recorded UUID: a household drive that
+// happens to be named „belso" keeps its mount, and the internal place waits (logged once).
+func (s *Server) EnsureInternalPlace(ctx context.Context) {
+	if s.internalPlaceFile == "" {
+		return
+	}
+	rec, ok, err := ReadInternalPlace(s.internalPlaceFile)
+	if err != nil {
+		s.internalPlaceNote("record unreadable: " + err.Error())
+		return
+	}
+	if !ok {
+		return
+	}
+	uuid := rec.FSUUID
+	st := &s.ipState
+	st.mu.Lock()
+	done := st.done == uuid
+	st.mu.Unlock()
+
+	// What is at /mnt/belso now, if anything?
+	mountedUUID, mounted := "", false
+	if mounts, merr := s.hostReader().Mounts(); merr == nil {
+		for _, m := range mounts {
+			if path.Clean(m.MountPoint) == InternalPlaceWhere {
+				mounted = true
+				if u, okU := s.hostReader().ResolveUUID(m.Device); okU {
+					mountedUUID = u
+				}
+			}
+		}
+	}
+	if mounted && mountedUUID != "" && mountedUUID != uuid {
+		s.internalPlaceNote("another filesystem (uuid " + mountedUUID + ") is mounted at " + InternalPlaceWhere + " — the internal place waits")
+		return
+	}
+	// A Felhom unit for /mnt/belso that names another UUID (a household drive called „belso", unplugged): never
+	// overwrite it — that would silently take the drive's name and mount point.
+	if s.driveTargets != nil {
+		if drives, derr := s.driveTargets.Known(ctx); derr == nil {
+			for _, d := range drives {
+				if path.Clean(d.MountPath) == InternalPlaceWhere && d.UUID != "" && d.UUID != uuid {
+					s.internalPlaceNote("a drive unit for " + InternalPlaceWhere + " names another uuid (" + d.UUID + ") — the internal place waits")
+					return
+				}
+			}
+		}
+	}
+	if mounted && mountedUUID == uuid {
+		if !done {
+			s.recordIntent(ctx, InternalPlaceWhere, "enrolled")
+			st.mu.Lock()
+			st.done, st.lastWhy = uuid, ""
+			st.mu.Unlock()
+			s.logger.Info("internal place: mounted and enrolled", "where", InternalPlaceWhere, "fs_uuid", uuid, "gib", rec.GiB)
+		}
+		return
+	}
+	if s.disks == nil {
+		s.internalPlaceNote("disk management is not configured on this host")
+		return
+	}
+	if s.resolveStorageDevice != nil {
+		if _, rerr := s.resolveStorageDevice("uuid:" + uuid); rerr != nil {
+			s.internalPlaceNote("its volume is not present (uuid " + uuid + ")")
+			return
+		}
+	}
+	start := time.Now()
+	if err := s.disks.EnsureMount(ctx, storage.MountSpec{Name: InternalPlaceName, UUID: uuid, Where: InternalPlaceWhere, FSType: "ext4"}); err != nil {
+		s.internalPlaceNote("mount failed: " + err.Error())
+		return
+	}
+	s.recordIntent(ctx, InternalPlaceWhere, "enrolled")
+	st.mu.Lock()
+	st.done, st.lastWhy = uuid, ""
+	st.mu.Unlock()
+	s.logger.Info("internal place: mounted on the host", "where", InternalPlaceWhere, "fs_uuid", uuid, "gib", rec.GiB,
+		"duration_ms", time.Since(start).Milliseconds())
+}
+
+func (s *Server) internalPlaceNote(why string) {
+	st := &s.ipState
+	st.mu.Lock()
+	changed := st.lastWhy != why
+	st.lastWhy, st.done = why, ""
+	st.mu.Unlock()
+	if changed {
+		s.logger.Warn("internal place: not ensured", "why", why)
+	} else {
+		s.logger.Debug("internal place: still not ensured", "why", why)
+	}
+}
+
+// InternalPlaceFileIn is the record's path inside a state dir.
+func InternalPlaceFileIn(stateDir string) string { return filepath.Join(stateDir, InternalPlaceFile) }

internal/localapi/internalplace_test.go

@@ -0,0 +1,249 @@
+package localapi
+
+import (
+	"context"
+	"errors"
+	"io"
+	"log/slog"
+	"net/http"
+	"os/exec"
+	"path/filepath"
+	"runtime"
+	"sync"
+	"testing"
+
+	"gitea.dooplex.hu/admin/felhom-agent/internal/hub"
+	"gitea.dooplex.hu/admin/felhom-agent/internal/storage"
+)
+
+// The internal data place (felhom.eu architecture/16 §5, agent v0.158.0): mounted like an enrolled drive, but never
+// at the cost of a household drive, never formatted, ejected or decommissioned, and the same disk as sys_drive.
+
+const ipUUID = "0b6e4c5a-1d2e-4f3a-9b8c-7d6e5f4a3b2c"
+const ipDev = "/dev/mapper/pve-felhom--belso"
+
+// ipHost is a HostReader whose mount table the test changes, and whose by-uuid map it controls.
+type ipHost struct {
+	mu     sync.Mutex
+	mounts []storage.Mount
+	uuids  map[string]string // device → fs-UUID
+}
+
+func (h *ipHost) Mounts() ([]storage.Mount, error) {
+	h.mu.Lock()
+	defer h.mu.Unlock()
+	return append([]storage.Mount(nil), h.mounts...), nil
+}
+func (h *ipHost) ResolveUUID(dev string) (string, bool) { u, ok := h.uuids[dev]; return u, ok }
+func (h *ipHost) DeviceExists(string) bool              { return true }
+func (h *ipHost) Rotational(string) (bool, bool)        { return false, false }
+func (h *ipHost) Removable(string) (bool, bool)         { return false, false }
+func (h *ipHost) BlockSlaves(string) ([]string, bool)   { return nil, false }
+
+func newIPHost(extra ...storage.Mount) *ipHost {
+	return &ipHost{
+		// root on a whole-disk partition (as sysOnSDA): the system disk resolves, so a USB drive is user-data.
+		mounts: append([]storage.Mount{{Device: "/dev/sda1", MountPoint: "/", FSType: "ext4"}}, extra...),
+		uuids:  map[string]string{ipDev: ipUUID, "/dev/sdb1": "99999999-aaaa-bbbb-cccc-dddddddddddd"},
+	}
+}
+
+type ipRig struct {
+	srv    *Server
+	disks  *fakeDiskOps
+	intent *fakeIntent
+}
+
+func newIPRig(t *testing.T, host *ipHost, known []storage.KnownTarget, record bool) ipRig {
+	t.Helper()
+	dir := t.TempDir()
+	file := filepath.Join(dir, InternalPlaceFile)
+	if record {
+		if err := WriteInternalPlace(file, InternalPlaceRecord{FSUUID: ipUUID, GiB: 183, MadeBy: "installer"}); err != nil {
+			t.Fatal(err)
+		}
+	}
+	d, in := &fakeDiskOps{}, newFakeIntent()
+	srv, err := NewServer(Options{
+		ListenAddr: "127.0.0.1:0", Guests: &fakeGuests{}, Backups: &fakeBackups{}, Store: &fakeStore{},
+		Storage: fakeStorage{}, Tokens: staticTokens{"A": 8200}, Disks: d, DiskGate: &fakeGate{},
+		HostReader: host, Intent: in, DriveTargets: fakeKnownTargets{drives: known},
+		InternalPlaceFile: file, Logger: slog.New(slog.NewTextHandler(io.Discard, nil)),
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	srv.baseCtx = context.Background()
+	srv.resolveStorageDevice = func(id string) (string, error) {
+		if id == "uuid:"+ipUUID {
+			return "/dev/dm-7", nil
+		}
+		return "", errors.New("absent")
+	}
+	return ipRig{srv, d, in}
+}
+
+func TestInternalPlace_NoRecord_DoesNothing(t *testing.T) {
+	r := newIPRig(t, newIPHost(), nil, false)
+	r.srv.EnsureInternalPlace(context.Background())
+	if len(r.disks.mountCalls) != 0 {
+		t.Fatalf("no record: no mount may be made, got %+v", r.disks.mountCalls)
+	}
+}
+
+func TestInternalPlace_Record_MountsByUUIDAtMntBelso(t *testing.T) {
+	r := newIPRig(t, newIPHost(), nil, true)
+	r.srv.EnsureInternalPlace(context.Background())
+	if len(r.disks.mountCalls) != 1 {
+		t.Fatalf("want exactly one EnsureMount, got %+v", r.disks.mountCalls)
+	}
+	got := r.disks.mountCalls[0]
+	if got.UUID != ipUUID || got.Where != InternalPlaceWhere || got.FSType != "ext4" || got.Name != InternalPlaceName {
+		t.Fatalf("EnsureMount spec: %+v", got)
+	}
+}
+
+func TestInternalPlace_AlreadyMounted_EnrolledOnceNoRemount(t *testing.T) {
+	host := newIPHost(storage.Mount{Device: ipDev, MountPoint: InternalPlaceWhere, FSType: "ext4"})
+	r := newIPRig(t, host, nil, true)
+	r.srv.EnsureInternalPlace(context.Background())
+	r.srv.EnsureInternalPlace(context.Background())
+	if len(r.disks.mountCalls) != 0 {
+		t.Fatalf("already mounted: no EnsureMount, got %+v", r.disks.mountCalls)
+	}
+	if r.intent.Get("uuid:"+ipUUID) != storage.IntentEnrolled {
+		t.Fatalf("the internal place must be recorded enrolled")
+	}
+}
+
+// A household drive called „belso" keeps its mount point: the internal place never takes it.
+// Positive control: TestInternalPlace_Record_MountsByUUIDAtMntBelso (the same record, /mnt/belso free).
+func TestInternalPlace_NeverTakesAHouseholdDriveNamedBelso(t *testing.T) {
+	mounted := newIPHost(storage.Mount{Device: "/dev/sdb1", MountPoint: InternalPlaceWhere, FSType: "ext4"})
+	r := newIPRig(t, mounted, nil, true)
+	r.srv.EnsureInternalPlace(context.Background())
+	if len(r.disks.mountCalls) != 0 || r.intent.Get("uuid:"+ipUUID) != "" {
+		t.Fatalf("a foreign filesystem at /mnt/belso: nothing may be mounted or recorded, got %+v", r.disks.mountCalls)
+	}
+	unplugged := []storage.KnownTarget{{Name: "belso", UUID: "99999999-aaaa-bbbb-cccc-dddddddddddd", MountPath: InternalPlaceWhere, MountBacked: true}}
+	r2 := newIPRig(t, newIPHost(), unplugged, true)
+	r2.srv.EnsureInternalPlace(context.Background())
+	if len(r2.disks.mountCalls) != 0 {
+		t.Fatalf("an unplugged household drive's unit for /mnt/belso must not be overwritten, got %+v", r2.disks.mountCalls)
+	}
+}
+
+func TestInternalPlace_VolumeAbsent_NoMount(t *testing.T) {
+	r := newIPRig(t, newIPHost(), nil, true)
+	r.srv.resolveStorageDevice = func(string) (string, error) { return "", errors.New("absent") }
+	r.srv.EnsureInternalPlace(context.Background())
+	if len(r.disks.mountCalls) != 0 {
+		t.Fatalf("absent volume: no mount, got %+v", r.disks.mountCalls)
+	}
+}
+
+// The household cannot eject or decommission it: its device is a device-mapper volume on the system disk.
+// Positive control: the same calls for a whole-disk USB drive (/dev/sdb1) are not refused by role.
+func TestInternalPlace_EjectAndDecommissionRefused(t *testing.T) {
+	host := newIPHost(
+		storage.Mount{Device: ipDev, MountPoint: InternalPlaceWhere, FSType: "ext4"},
+		storage.Mount{Device: "/dev/sdb1", MountPoint: "/mnt/hdd_1", FSType: "ext4"},
+	)
+	r := newIPRig(t, host, nil, true)
+	h := r.srv.Handler()
+	for _, route := range []string{"/disks/eject", "/disks/decommission"} {
+		if w := do(t, h, "POST", route, "A", `{"where":"/mnt/belso"}`); w.Code != http.StatusForbidden {
+			t.Fatalf("%s /mnt/belso: want 403, got %d %s", route, w.Code, w.Body.String())
+		}
+	}
+	if w := do(t, h, "POST", "/disks/eject", "A", `{"where":"/mnt/hdd_1"}`); w.Code == http.StatusForbidden {
+		t.Fatalf("positive control: a USB drive's eject must not be refused by role, got %d %s", w.Code, w.Body.String())
+	}
+	for _, u := range r.disks.unmountCalls {
+		if u == InternalPlaceWhere {
+			t.Fatalf("the internal place must never be unmounted, got %+v", r.disks.unmountCalls)
+		}
+	}
+}
+
+// The consequence `16` §5 needs: a copy between the internal place and sys_drive is the SAME disk (build A then never
+// counts it), and the place is reported as kind internal.
+type ipIdentHost struct{ fakeIdentHost }
+
+func (h *ipIdentHost) KernelName(dev string) (string, bool) {
+	if dev == ipDev {
+		return "dm-7", true
+	}
+	return h.fakeIdentHost.KernelName(dev)
+}
+func (h *ipIdentHost) Slaves(n string) []string {
+	if n == "dm-7" {
+		return []string{"dm-3"} // felhom-belso → the thin pool
+	}
+	if n == "dm-3" {
+		return []string{"sda3"} // the pool → the system disk's LVM partition
+	}
+	return nil
+}
+
+func TestInternalPlace_IsTheSystemDiskAndKindInternal(t *testing.T) {
+	ih := &ipIdentHost{fakeIdentHost{
+		virt:   "none",
+		parent: map[string]string{"sda3": "sda"},
+		props:  map[string]map[string]string{"sda": {"ID_BUS": "ata", "ID_MODEL": "SanDisk", "ID_SERIAL_SHORT": "1"}},
+		mounts: []storage.Mount{
+			{Device: "/dev/mapper/pve-root", MountPoint: "/", FSType: "ext4"},
+			{Device: "/dev/mapper/pve-root", MountPoint: "/mnt/felhom-drives", FSType: "ext4"},
+			{Device: ipDev, MountPoint: InternalPlaceWhere, FSType: "ext4"},
+			{Device: ipDev, MountPoint: "/mnt/felhom-drives/belso", FSType: "ext4"},
+		},
+	}}
+	fg := &fakeGuestsCfg{mounts: map[int]map[string]string{8200: {
+		"mp0": "local-lvm:vm-8200-disk-1,mp=/var/lib/felhom,backup=1,size=100G",
+		"mp8": "/mnt/felhom-drives,mp=/mnt/felhom-drives",
+	}}}
+	dir := t.TempDir()
+	file := filepath.Join(dir, InternalPlaceFile)
+	if err := WriteInternalPlace(file, InternalPlaceRecord{FSUUID: ipUUID}); err != nil {
+		t.Fatal(err)
+	}
+	srv, err := NewServer(Options{
+		ListenAddr: "127.0.0.1:0", Guests: fg, Backups: &fakeBackups{}, Store: &fakeStore{},
+		Storage: fakeStorage{targets: []hub.StorageTarget{provenSSD}}, Tokens: staticTokens{"A": 8200},
+		HostReader: fakeHostReader{mounts: ih.mounts}, Identity: &storage.IdentityResolver{Host: ih},
+		InternalPlaceFile: file, Logger: slog.New(slog.NewTextHandler(io.Discard, nil)),
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	srv.baseCtx = context.Background()
+	got, code := sameDisk(t, srv.Handler(), "/mnt/felhom-drives/belso/felhom-data/jellyfin", "/mnt/sys_drive")
+	if code != http.StatusOK || got.Different || !got.Proven || got.Reason != "same_disk" {
+		t.Fatalf("internal place vs sys_drive: want same disk, proven; got %d %+v", code, got)
+	}
+	if got.A.Kind != storage.PlaceKindInternal {
+		t.Fatalf("kind: want %q, got %q", storage.PlaceKindInternal, got.A.Kind)
+	}
+}
+
+func TestInternalPlaceRecord_RefusesANonUUID(t *testing.T) {
+	file := filepath.Join(t.TempDir(), InternalPlaceFile)
+	if err := WriteInternalPlace(file, InternalPlaceRecord{FSUUID: "../../etc"}); err == nil {
+		t.Fatal("a non-UUID must not be written")
+	}
+}
+
+// The root helper's own tests (configs/test_felhom_internal_place.py — the ruled size table, never formatting what
+// holds anything) run with the Go suite.
+func TestInternalPlaceHelperPythonSuite(t *testing.T) {
+	py, err := exec.LookPath("python3")
+	if err != nil {
+		t.Skip("python3 not found")
+	}
+	_, file, _, _ := runtime.Caller(0)
+	script := filepath.Join(filepath.Dir(file), "..", "..", "configs", "test_felhom_internal_place.py")
+	out, err := exec.Command(py, script).CombinedOutput()
+	if err != nil {
+		t.Fatalf("helper suite failed: %v\n%s", err, out)
+	}
+}

internal/localapi/samedisk.go

@@ -135,6 +135,8 @@ func (s *Server) ownMountIdentity(hostPath string) (storage.PlaceIdentity, strin
 	}
 	kind := storage.PlaceKindDisk
 	switch {
+	case s.isInternalPlace(hostPath): // v0.158.0 `16` §5: the one-disk box's data place, on the system disk
+		kind = storage.PlaceKindInternal
 	case id.Reason == storage.ReasonNetwork:
 		kind = storage.PlaceKindNetwork
 	case strings.HasPrefix(m.Device, "/dev/") && !strings.HasPrefix(m.Device, "/dev/mapper/") && isPartitionPath(m.Device):

internal/localapi/server.go

@@ -208,6 +208,9 @@ type Options struct {
 	// Intent records drive enroll/eject intent for the self-heal watchdog (slice 10 P3). OPTIONAL —
 	// when nil, no intent is recorded (self-heal runs ungated).
 	Intent IntentRecorder
+	// InternalPlaceFile (v0.158.0, felhom.eu `16` §5) is the path of the internal data place record
+	// (InternalPlaceRecord). OPTIONAL — "" means this host has no internal place and EnsureInternalPlace is a no-op.
+	InternalPlaceFile string
 	// GuestBinds persists which user-data drives (by durable-id) are enrolled into each guest, so the
 	// startup re-assert (ReassertGuestBinds) can restore a bind that a re-provision dropped (F9).
 	// OPTIONAL — when nil, guest binds are not recorded and the startup re-assert is a no-op.
@@ -316,12 +319,14 @@ type Server struct {
 	// identity blob from the hub, unseal it with the customer's recovery code, return ONLY the
 	// offsite repository password. OPTIONAL — nil (no hub client configured) makes
 	// POST /escrow/recover-offsite-password answer 503 rather than pretending.
-	escrowRecovery EscrowRecoverer
-	intent         IntentRecorder                      // slice 10 P3 (optional)
-	guestBinds     *GuestBindStore                     // F9 startup bind re-assert record (optional)
-	formatJobs     *FormatJobStore                     // F20-BUG3 detached-format job record (optional)
-	staleLock      StaleLockController                 // F2-b startup stale-lock recovery (optional)
-	partialSweep   func(ctx context.Context, vmid int) // R-1006 start-up sweep of dead vzdump leftovers (optional)
+	escrowRecovery    EscrowRecoverer
+	intent            IntentRecorder                      // slice 10 P3 (optional)
+	internalPlaceFile string                              // v0.158.0 `16` §5 (optional)
+	ipState           internalPlaceState                  // EnsureInternalPlace's memo
+	guestBinds        *GuestBindStore                     // F9 startup bind re-assert record (optional)
+	formatJobs        *FormatJobStore                     // F20-BUG3 detached-format job record (optional)
+	staleLock         StaleLockController                 // F2-b startup stale-lock recovery (optional)
+	partialSweep      func(ctx context.Context, vmid int) // R-1006 start-up sweep of dead vzdump leftovers (optional)
 	// guestPower (F-REBOOT) is per-guest start-attempt state for the guest-power watchdog.
 	// Guarded by guestPowerMu in guestpower.go; in-memory on purpose (see guestPowerState).
 	guestPower map[int]guestPowerState
@@ -455,43 +460,44 @@ func NewServer(o Options) (*Server, error) {
 		cadence = defaultBackupCadence
 	}
 	s := &Server{
-		addr:            o.ListenAddr,
-		cert:            o.Cert,
-		guests:          o.Guests,
-		backups:         o.Backups,
-		store:           o.Store,
-		storage:         o.Storage,
-		driveTargets:    o.DriveTargets,
-		smart:           o.Smart,
-		tokens:          o.Tokens,
-		cadence:         cadence,
-		logger:          o.Logger,
-		now:             func() time.Time { return time.Now().UTC() },
-		disks:           o.Disks,
-		diskGate:        o.DiskGate,
-		guestList:       o.Guests2,
-		guestAttach:     o.GuestAttach,
-		mem:             o.Memory,
-		netStorage:      o.NetStorage,
-		privileged:      o.Privileged,
-		configPath:      o.ConfigPath,
-		stateDir:        o.StateDir,
-		netMountRoot:    storage.NetworkMountRoot,
-		smbCredsDir:     o.SmbCredsDir,
-		escrowStagePath: o.EscrowStagePath,
-		escrowRecovery:  o.EscrowRecovery,
-		intent:          o.Intent,
-		guestBinds:      o.GuestBinds,
-		formatJobs:      o.FormatJobs,
-		staleLock:       o.StaleLock,
-		host:            o.HostReader,
-		ident:           o.Identity,
-		hostMetrics:     o.HostMetrics,
-		hostID:          o.HostID,
-		agentVersion:    o.AgentVersion,
-		logRing:         o.LogRing,
-		jobs:            map[backupJobKey]*backupJob{},
-		swapInFlight:    map[int]bool{},
+		addr:              o.ListenAddr,
+		cert:              o.Cert,
+		guests:            o.Guests,
+		backups:           o.Backups,
+		store:             o.Store,
+		storage:           o.Storage,
+		driveTargets:      o.DriveTargets,
+		smart:             o.Smart,
+		tokens:            o.Tokens,
+		cadence:           cadence,
+		logger:            o.Logger,
+		now:               func() time.Time { return time.Now().UTC() },
+		disks:             o.Disks,
+		diskGate:          o.DiskGate,
+		guestList:         o.Guests2,
+		guestAttach:       o.GuestAttach,
+		mem:               o.Memory,
+		netStorage:        o.NetStorage,
+		privileged:        o.Privileged,
+		configPath:        o.ConfigPath,
+		stateDir:          o.StateDir,
+		netMountRoot:      storage.NetworkMountRoot,
+		smbCredsDir:       o.SmbCredsDir,
+		escrowStagePath:   o.EscrowStagePath,
+		escrowRecovery:    o.EscrowRecovery,
+		intent:            o.Intent,
+		internalPlaceFile: o.InternalPlaceFile,
+		guestBinds:        o.GuestBinds,
+		formatJobs:        o.FormatJobs,
+		staleLock:         o.StaleLock,
+		host:              o.HostReader,
+		ident:             o.Identity,
+		hostMetrics:       o.HostMetrics,
+		hostID:            o.HostID,
+		agentVersion:      o.AgentVersion,
+		logRing:           o.LogRing,
+		jobs:              map[backupJobKey]*backupJob{},
+		swapInFlight:      map[int]bool{},
 	}
 	// R-82 tier resolution. Options.BackupTiers is authoritative when supplied; otherwise ONE tier
 	// is synthesized from Backups + BackupCadence — the pre-R-82 shape, so every existing caller