because we never ever want to die in get_disks because of a
single disk, but the nodes/xyz/disks/smart API path is
allowed to fail if a disk device is unsupported by smartctl
or something else goes wrong.
since smartctl uses the return value to encode
disk health status (such as failure in the past)
we cannot die there, but have to parse the returncode
Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
this adds the functions for listing the disks (mostly copied from
the ceph code), checking if a disk is a valid blockdevice, if it
is used/in a zfs pool/as an lvm pv, and an init function (just to add a gpt header;
this is important if one wants to use a fresh disk for ceph journals)
Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
