Christian Brauner
3063448b51
Define the IDL for io.systemd.MachineInstance.ReplaceStorage, a runtime hot-swap of an already-attached storage volume's backing file. The signature mirrors AddStorage minus the 'config' field because the device frontend (virtio-blk, virtio-scsi, nvme, scsi-cd) does not change — only the backing file behind it. The implementation lives in vmspawn (next commit) and uses QMP blockdev-reopen to swap the file child of the existing format node. The reused error vocabulary (NoSuchStorage, StorageImmutable, NotConnected, plus the generic errno path) covers every failure mode; no new errors are added. Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
System and Service Manager
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