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e4a58c38e9
Add --image-disk-type= to select the disk type for the root disk, and
allow specifying the disk type as a colon-separated prefix on
--extra-drive=:
systemd-vmspawn --image-disk-type=virtio-scsi --image=image.raw
systemd-vmspawn --image=image.raw --extra-drive=virtio-scsi:data.raw
For --extra-drive=, the format and disk type prefixes can appear in any
order since the value sets don't overlap:
--extra-drive=raw:virtio-scsi:/path
--extra-drive=virtio-scsi:raw:/path
Extra drives inherit --image-disk-type= by default unless overridden
with an explicit prefix.
vmspawn originally used virtio-scsi for all drives but switched to
virtio-blk in 1f24a954e4 for simplicity and direct kernel boot
compatibility. This makes virtio-scsi available again as an explicit
option for cases where a SCSI storage topology is desired.
For virtio-scsi, a shared virtio-scsi-pci controller is created and
drives are attached as scsi-hd devices. The SCSI serial number is
limited to 30 characters, so filenames exceeding this are hashed with
SHA-256.
Signed-off-by: Christian Brauner <brauner@kernel.org>