verification done for cosmic/hw-detect.

disk-detect found the iscsi target/lun configured in ibft.

cosmic currently needed the workaround to download/install
the iscsi_ibft.ko module, because the d-i changes are not
yet in (update to kernel version to includes it in scsi-modules.udeb).

$ wget http://boot.ipxe.org/ipxe.lkrn
$ wget http://archive.ubuntu.com/ubuntu/dists/cosmic-updates/main/installer-amd64/20101020ubuntu557.1/images/netboot/ubuntu-installer/amd64/{linux,initrd.gz}

$ python3 -m http.server &

$ qemu-system-x86_64 \
      -nodefaults \
      -enable-kvm \
      -smp 2 -m 4096 \
      -serial stdio \
      -vga virtio \
      -display vnc=0.0.0.0:1 \
      -netdev bridge,id=bridge-world,br=virbr0 \
      -netdev bridge,id=bridge-iscsi,br=virbr-iscsi \
      -device virtio-net-pci,netdev=bridge-world,id=nic-world,mac=52:54:00:00:00:01 \
      -device virtio-net-pci,netdev=bridge-iscsi,id=nic-iscsi,mac=52:54:00:00:00:02 \
      -kernel ipxe.lkrn


workstation $ vncviewer buneary.segmaas.1ss:1

    <ctrl-b>

    iPXE>

    iPXE> ifopen net1
    iPXE> set net1/ip 10.0.0.2
    iPXE> set net1/netmask 255.255.255.0

    iPXE> sanhook iscsi:10.0.0.1:::1:iqn.2019-06.com.example:target1
    Registered SAN device 0x80

    iPXE> ifopen net0
    iPXE> kernel http://192.168.122.1:8000/linux initrd=initrd.gz apt-setup/proposed=true disk-detect/ibft/enable=true --- console=ttyS0
    iPXE> initrd http://192.168.122.1:8000/initrd.gz
    iPXE> boot 

...

~ # ls /lib/modules/4.18.0-10-generic/kernel/drivers/firmware/iscsi_ibft.ko
ls: /lib/modules/4.18.0-10-generic/kernel/drivers/firmware/iscsi_ibft.ko: No such file or directory

~ # cd /tmp
/tmp # wget http://archive.ubuntu.com/ubuntu/pool/main/l/linux/linux-modules-4.18.0-10-generic_4.18.0-10.11_amd64.deb
/tmp # ar x linux-modules-4.18.0-10-generic_4.18.0-10.11_amd64.deb 
/tmp # xzcat data.tar.xz | tar x
/tmp # mkdir /lib/modules/4.18.0-10-generic/kernel/drivers/firmware
/tmp # cp lib/modules/4.18.0-10-generic/kernel/drivers/firmware/iscsi_ibft.ko /lib/modules/4.18.0-10-generic/kernel/drivers/firmware/
/tmp # exit

...


  │ Select disk to partition:                                               │
  │                                                                         │
  │            SCSI3 (0,0,1) (sda) - 8.6 GB IET VIRTUAL-DISK                │


...
~ # grep 'retrieving disk-detect' /var/log/syslog
Jun  6 00:05:52 anna[1521]: DEBUG: retrieving disk-detect 1.117ubuntu6.18.10.1

~ # sed -n '/scsi_ibft.ko/,/iBFT disk detection finished/p' /var/log/syslog
Jun  6 00:10:59 disk-detect: insmod /lib/modules/4.18.0-10-generic/kernel/drivers/firmware/iscsi_ibft.ko
Jun  6 00:10:59 kernel: [  364.281283] iBFT detected.
Jun  6 00:10:59 disk-detect: # BEGIN RECORD 2.0-874
Jun  6 00:10:59 disk-detect: iface.initiatorname = iqn.2010-04.org.ipxe:00000000-0000-0000-0000-000000000000
Jun  6 00:10:59 disk-detect: iface.hwaddress = 52:54:00:00:00:02
Jun  6 00:10:59 disk-detect: iface.bootproto = STATIC
Jun  6 00:10:59 disk-detect: iface.ipaddress = 10.0.0.2
Jun  6 00:10:59 disk-detect: iface.subnet_mask = 255.255.255.0
Jun  6 00:10:59 disk-detect: iface.primary_dns = 192.168.122.1
Jun  6 00:10:59 disk-detect: iface.vlan_id = 0
Jun  6 00:10:59 disk-detect: iface.net_ifacename = ens4
Jun  6 00:10:59 disk-detect: node.name = iqn.2019-06.com.example:target1
Jun  6 00:10:59 disk-detect: node.conn[0].address = 10.0.0.1
Jun  6 00:10:59 disk-detect: node.conn[0].port = 3260
Jun  6 00:10:59 disk-detect: node.boot_lun = 01000000
Jun  6 00:10:59 disk-detect: # END RECORD
Jun  6 00:10:59 disk-detect: Setting up software interface ens4
Jun  6 00:10:59 disk-detect: iscsistart: version 2.0-874
Jun  6 00:10:59 kernel: [  364.296265] Loading iSCSI transport class v2.0-870.
Jun  6 00:10:59 kernel: [  364.304322] iscsi: registered transport (tcp)
Jun  6 00:10:59 kernel: [  364.305731] scsi host2: iSCSI Initiator over TCP/IP
Jun  6 00:10:59 disk-detect: iscsistart: Connection1:0 to [target: iqn.2019-06.com.example:target1, portal: 10.0.0.1,3260] through [iface: d
efault] is operational now
Jun  6 00:10:59 kernel: [  364.310276] scsi 2:0:0:0: RAID              IET      Controller       0001 PQ: 0 ANSI: 5
Jun  6 00:10:59 kernel: [  364.311404] scsi 2:0:0:0: Attached scsi generic sg0 type 12
Jun  6 00:10:59 disk-detect: iscsistart: Logging into iqn.2019-06.com.example:target1 10.0.0.1:3260,1
Jun  6 00:10:59 kernel: [  364.312491] scsi 2:0:0:1: Direct-Access     IET      VIRTUAL-DISK     0001 PQ: 0 ANSI: 5
Jun  6 00:10:59 kernel: [  364.313947] sd 2:0:0:1: Attached scsi generic sg1 type 0
Jun  6 00:10:59 kernel: [  364.314374] sd 2:0:0:1: Power-on or device reset occurred
Jun  6 00:10:59 kernel: [  364.316862] sd 2:0:0:1: [sda] 16777216 512-byte logical blocks: (8.59 GB/8.00 GiB)
Jun  6 00:10:59 kernel: [  364.316864] sd 2:0:0:1: [sda] 4096-byte physical blocks
Jun  6 00:10:59 kernel: [  364.317102] sd 2:0:0:1: [sda] Write Protect is off
Jun  6 00:10:59 kernel: [  364.317104] sd 2:0:0:1: [sda] Mode Sense: 69 00 10 08
Jun  6 00:10:59 kernel: [  364.317616] sd 2:0:0:1: [sda] Write cache: enabled, read cache: enabled, supports DPO and FUA
Jun  6 00:10:59 kernel: [  364.326235] sd 2:0:0:1: [sda] Attached SCSI disk
Jun  6 00:10:59 disk-detect: iBFT disk detection finished.