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This commit implements the in-place restore of VM backups. Selected VM disks will
be replaced with the specified backup:
* A new API call has been added to the XML-RPC API (`one.vm.restore`) with
the following arguments:
- VM ID to be restored, needs to be in **poweroff** state
- IMAGE ID of the backup to restore
- INCREMENT ID, only for incremental backups, the increment to use
(defults to -1 to use the last increment available)
- DISK ID of the disk to restore (defaults to -1 to restore all VM
disks)
* Datastore drivers needs to implemente a new operation `ls`. This new
operation takes the VM, image information of the backup and datastore
information and returns the restore URL for the disks in the backup.
* This commit includes the implementation for qcow2 and ssh drivers,
ceph will be implemented in a separated PR. The new driver action is
`restore host:vm_dir vm_id img_id inc_id disk_id`
* The restore operation is performed in a new state `PROLOG_RESTORE`
rendered as `RESTORE` and `rest` in short form. State in in RSuntone.
TODO:
- Remove any existing VM snapshot (system/disk) in the VM. Note that
snapshots are not included in a backup.
- Ceph drivers
- JAVA, GO Lang API bindings
- Sunstone interface, new state and new operation. Review new state in
RSuntone.
co-authored-by: Pavel Czerny <pczerny@opennebula.io>