Fix detach_iso: eject the ISO-bearing drive(s), not the first CD/DVD

detach_iso used _find_cdrom (first drive), so on VMs with multiple CD/DVD
drives (e.g. Cisco CUCM's two) it 'ejected' an already-empty drive and
reported previous_iso=null while the mounted ISO stayed put. Now it finds
every drive with an IsoBackingInfo and ejects them all, reporting each.

src/mcvsphere/mixins/disk_management.py

@@ -511,42 +511,56 @@ class DiskManagementMixin(VSphereMixin):
         if not vm:
             raise ValueError(f"VM '{vm_name}' not found")
 
-        cdrom = self._find_cdrom(vm)
-        if not cdrom:
+        cdroms = [
+            d
+            for d in vm.config.hardware.device
+            if isinstance(d, vim.vm.device.VirtualCdrom)
+        ]
+        if not cdroms:
             raise ValueError(f"No CD/DVD drive found on VM '{vm_name}'")
 
-        # Get current ISO path for reporting
-        old_iso = None
-        if hasattr(cdrom.backing, "fileName"):
-            old_iso = cdrom.backing.fileName
+        # Eject every drive that actually has an ISO mounted (a VM may have
+        # several CD/DVD drives; the ISO is rarely on the first one).
+        iso_cdroms = [
+            c
+            for c in cdroms
+            if isinstance(c.backing, vim.vm.device.VirtualCdrom.IsoBackingInfo)
+        ]
+        if not iso_cdroms:
+            return {
+                "vm": vm_name,
+                "action": "no_iso_mounted",
+                "previous_iso": None,
+                "ejected": [],
+            }
 
-        # Create empty client device backing (ejects the ISO)
-        backing = vim.vm.device.VirtualCdrom.RemotePassthroughBackingInfo()
-        backing.deviceName = ""
+        device_changes = []
+        ejected = []
+        for cdrom in iso_cdroms:
+            ejected.append(
+                {"cdrom": cdrom.deviceInfo.label, "previous_iso": cdrom.backing.fileName}
+            )
+            backing = vim.vm.device.VirtualCdrom.RemotePassthroughBackingInfo()
+            backing.deviceName = ""
+            backing.exclusive = False
+            cdrom.backing = backing
+            cdrom.connectable = vim.vm.device.VirtualDevice.ConnectInfo()
+            cdrom.connectable.connected = False
+            cdrom.connectable.startConnected = False
+            cdrom.connectable.allowGuestControl = True
 
-        # Configure CD-ROM
-        cdrom.backing = backing
-        cdrom.connectable = vim.vm.device.VirtualDevice.ConnectInfo()
-        cdrom.connectable.connected = False
-        cdrom.connectable.startConnected = False
-        cdrom.connectable.allowGuestControl = True
+            spec = vim.vm.device.VirtualDeviceSpec()
+            spec.operation = vim.vm.device.VirtualDeviceSpec.Operation.edit
+            spec.device = cdrom
+            device_changes.append(spec)
 
-        # Create device edit spec
-        cdrom_spec = vim.vm.device.VirtualDeviceSpec()
-        cdrom_spec.operation = vim.vm.device.VirtualDeviceSpec.Operation.edit
-        cdrom_spec.device = cdrom
-
-        # Create VM config spec
-        config_spec = vim.vm.ConfigSpec()
-        config_spec.deviceChange = [cdrom_spec]
-
-        # Reconfigure VM
+        config_spec = vim.vm.ConfigSpec(deviceChange=device_changes)
         task = vm.ReconfigVM_Task(spec=config_spec)
         conn.wait_for_task(task)
 
         return {
             "vm": vm_name,
             "action": "iso_detached",
-            "previous_iso": old_iso,
-            "cdrom": cdrom.deviceInfo.label,
+            "previous_iso": ejected[0]["previous_iso"],
+            "ejected": ejected,
         }