fix(macos): keep optical drive identity stable during exclusive access

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## Unreleased
+
+- macOS optical-drive enumeration keeps the same IOKit service selector with or without mounted media, so exclusive access during a rip does not turn one drive into two identities.
+
 ## [1.8.0] — 2026-10-05
 
 ### Breaking

src/scsi/macos_shim.c

@@ -179,10 +179,9 @@ static int registry_entry_bsd_name(io_registry_entry_t entry, char *buf, size_t
     return ok;
 }
 
-// Empty optical drives have a service node but no IOMedia node, hence
-// no BSD diskN name. Use the service's IOKit registry ID as an opaque selector
-// until media appears. It is process/boot-local, which is sufficient for the
-// list-then-open GUI flow.
+// Optical services outlive their IOMedia nodes, which disappear for an empty
+// tray and during exclusive access. Use the service registry ID as the stable
+// selector throughout insertion, ripping and ejection (until unplug/reboot).
 static int registry_id_selector(io_registry_entry_t entry, char *buf, size_t buflen) {
     uint64_t registry_id = 0;
     if (IORegistryEntryGetRegistryEntryID(entry, &registry_id) != KERN_SUCCESS) return 0;
@@ -864,9 +863,10 @@ static int visit_list(io_service_t svc, void *ctx) {
     memset(info, 0, sizeof(*info));
 
     bdsvc_device_info(svc, info);
-    if (!bdsvc_to_bsd_name(svc, info->device_selector, sizeof(info->device_selector))) {
+    // IOMedia (and its diskN name) disappears during exclusive access. The
+    // optical service survives: always use its ID so a busy drive cannot be
+    // enumerated as a second, apparently empty drive after opening it.
     registry_id_selector(svc, info->device_selector, sizeof(info->device_selector));
-    }
     if (info->device_selector[0]) lc->count++;
     return lc->count >= lc->max ? 2 : 0;
 }

src/scsi/mod.rs

@@ -561,8 +561,8 @@ pub(crate) fn open_with(device: &Path, halt: &crate::halt::Halt) -> Result<Box<d
 /// no firmware reset, no init.
 #[derive(Debug, Clone)]
 pub struct DriveInfo {
-    /// Platform device path: `/dev/sgN` (Linux), `/dev/diskN` or an opaque
-    /// `ioreg:<id>` selector for an empty optical drive (macOS), `\\.\CdRomN`
+    /// Platform device path: `/dev/sgN` (Linux), a stable optical-service
+    /// `ioreg:<id>` selector (macOS), `\\.\CdRomN`
     /// (Windows).
     pub path: String,
     /// SCSI INQUIRY vendor identifier (e.g. `"HL-DT-ST"`).