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Description of problem:
[Machines] The Bus options for editing CD/DVD disc should be the same as adding options for Custom path

Version-Release number of selected components (if applicable):
cockpit-machines-249-1.el9.noarch
cockpit-250-1.el9.x86_64
libvirt-dbus-1.4.1-4.el9.x86_64

How reproducible:
100%

Steps to Reproduce:
1. Prepare a shutdown vm and a iso file: test.iso
2. Enter the vm details page, click "Add disk", choose Custom path
Custom path: /tmp/test.iso
Device : CD/DVD disc
There are 3 options in Bus: usb/sata/scsi, keep the default, click Add
3. Click Edit for the new added iso disk, there is 4 options :virtio/usb/sata/scsi
Choose virtio, click Save, there will be error like :
Disk settings could not be saved
unsupported configuration: disk type of 'vda' does not support ejectable media


Actual results:
In step3 there are 4 options, which not corresponding to step 2. 

Expected results:
The error message looks fine in step 3, but better to have the options corresponding both for adding and editing in step2 and step3.

Additional info:

Upstream fix: https://github.com/cockpit-project/cockpit-machines/pull/337

The fix [1] came with an integration test that runs in gating, this provides pre-verification.

[1] https://github.com/cockpit-project/cockpit-machines/pull/337/files

Tested with packages:
cockpit-machines-254-1.el9.noarch
cockpit-255-1.el9.x86_64
libvirt-dbus-1.4.1-5.el9.x86_64

Steps:
1. Prepare a shutdown vm and a iso file: test.iso
2. Enter the vm details page, click "Add disk", choose Custom path
Custom path: /tmp/test.iso
Device : CD/DVD disc
There are 3 options in Bus: usb/sata/scsi, keep the default, click Add
3. Click Edit for the new added iso disk, there is 3 options which is the same with in step 2.

So verified.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (new packages: cockpit-machines), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2022:2388