[Kimchi-devel] [RFC] Manage guest CDROM devices

[Rodrigo Trujillo]

Reference:
https://github.com/kimchi-project/kimchi/wiki/Todo-1.2
https://github.com/kimchi-project/kimchi/wiki/customize-VM


Royce has created the structure to add/list/lookup cdrom devices in the 
guests.
There is a patch in the list (still under revision) with the code:
" Kimchi-devel] [PATCH 0/5] cdrom: support add and query cdrom "

This RFC aims to continue the second part of this work and modify the 
API to
allow user to change (UPDATE/POST) attached cd ISOs and delete (DELETE) 
cdrom devices.
If necessary I can continue the Royces work.


Aline has suggested to use the API as  "/vms/<name>/storages" :
"""
. . .  Maybe we can use /vms/<name>/storages
That way we can use the same API to add/remove different kind of 
storages to the vm: cdrom, scsi disk, ide disk, etc ...
"""
This is the first decision here
(1) Use  api as follow ?
    (I propose to use API params to differentiate the storages, like 
'?type=cdrom')

    **URI:** /vms/*:name*/storages
    * **GET**: Retrieve all storages attached to the VM
    * **POST**: Attatch new storage to specified virtual machine.
        * name : The name of the storage in the VM.
        * type: The type of the storage: cdrom, disk
        * path *(optional)*: Path of ISO or DISK.

    ### Sub-resource: storage
    **URI:** /vms/*:name*/storage/*:name*
    * **GET**: Retrieve the storage information
        * path: Path of the storage
        * type: Type of the storage
    * **PUT**: Update storage information
        * name *(optional)*: The name of the storage in the VM.
        * path *(optional)*: Path of ISO or DISK.
    * **DELETE**: Remove the storage

Examples:
UPDATE {'path': ''} /vms/vm-1/storage/cdrom-1--> to eject the iso
UPDATE {'path': '/root/ubuntu.iso'} /vms/vm-1/storage/cdrom-1-->to 
change or insert a media
POST {'path':'abcd', 'bus': 'ide', 'name': 'cdrom-2'} /vms/vm-1/storage 
--> to attach a new cdrom
DELETE {} /vms/vm-1/cdroms/cdrom-1-->to detach a cdrom

(2) Should be possible to add and remove storages with the guest running 
? (Like hot plug)
        Does libvirt provide this ?

(3) The new attached isos should be shown in the guests like changing a CD ?

(4) The specification mention tuning of the devices. Should tuning be 
always done in the background, or
allow users to specify tuning parameters ?

Regards,

Rodrigo Trujillo
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