Re: [Libguestfs] [PATCH nbdkit v3 2/5] tests: Implement a better nbdkit-partition-filter test.

On 1/22/19 4:20 PM, Richard W.M. Jones wrote: I don't know how to make sfdisk populate ONLY partition 2 using non-label form (short of populating both 1 and 2, then deleting partition 1), but as there are disks in the wild like that, it might make for an interesting test. But I _do_ know how to do it using labeled form, by doing it manually and then letting --dump tell me how to repeat it: $ truncate --size 1G disk $ sfdisk -X dos disk <<\EOF , 100M , 100M EOF $ sfdisk --delete disk 1 $ sfdisk --dump disk label: dos label-id: 0x1b18e388 device: disk unit: sectors disk2 : start= 206848, size= 204800, type=83 In fact, labeled form is how you convince sfdisk to create partitions in non-ascending order, to the point that 'sfdisk --reorder' then shuffles the tables (but not the partitions themselves) to be back in ascending order (of course, reordering can invalidate /etc/fstab and other references in the guest OS that were keying off of partition number instead of label) -- Eric Blake, Principal Software Engineer Red Hat, Inc. +1-919-301-3226 Virtualization: qemu.org | libvirt.org