Fixed missing drivers in ppc64le images (bsc#1241887)

[lslezak]

Problem

• The installer does not boot via PXE on ppc64le architecture
• https://bugzilla.suse.com/show_bug.cgi?id=1241887
• During boot this error message is printed and booting is aborted:

  dracut-pre-mount[1075]: modprobe: FATAL: Module brd not found in directory
  /usr/lib/modules/6.12.0-160000.5-default
  

• The generated initrd does not contain the brd driver which is need by Kiwi for PXE boot
• The build log contains this error:

  dracut[E]: FAILED:  /usr/lib/dracut/dracut-install -D  /var/tmp/dracut.ZzQ4qS/initramfs
  -N ^i2o_scsi$ --kerneldir /lib/modules/6.12.0-160000.9-default/ -m xhci_pci-renesas
  acpi_ipmi ipmi_devintf ipmi_poweroff ipmi_si ipmi_ssif ipmi_watchdog brd
  

• Despite the error dracut reports success so the problem can be easily overlooked 😟

Solution

• It turned out that dracut gives up at the first missing driver (acpi_ipmi) and does not add the other remaining drivers
• The original check tested only the presence of the ipmi directory but the content can be actually different on different architectures
• So rather explicitly check presence of each driver

Additional fix

• Removed the workaround for adding the xhci-pci-renesas driver, now it is included in the default dracut drivers
• See fix(90kernel-modules): explicitly include xhci-pci-renesas (bsc#1238258) openSUSE/dracut#406

Testing

• Build tested in https://build.opensuse.org/package/show/systemsmanagement:Agama:branches:pxe_build_fix_ppc64/agama-installer
• The build output snippet on ppc64le, the acpi_ipmi driver was skipped (on x86_64 all drivers are found and added to initrd)

[  314s] [ DEBUG   ]: 14:11:17 | Skipping driver acpi_ipmi, not found in the system
[  314s] [ DEBUG   ]: 14:11:17 | Adding ipmi_devintf driver to initrd...
[  314s] [ DEBUG   ]: 14:11:17 | Adding ipmi_poweroff driver to initrd...
[  314s] [ DEBUG   ]: 14:11:17 | Adding ipmi_si driver to initrd...
[  314s] [ DEBUG   ]: 14:11:17 | Adding ipmi_ssif driver to initrd...
[  314s] [ DEBUG   ]: 14:11:17 | Adding ipmi_watchdog driver to initrd...

• All required drivers are present in the created initrd:

[  611s] dracut[D]: drwxr-xr-x   2 root     root            0 Apr 28 16:12 usr/lib/modules/6.14.2-1-default/kernel/drivers/char/ipmi
[  611s] dracut[D]: -rw-r--r--   1 root     root        29763 Apr 14 08:05 usr/lib/modules/6.14.2-1-default/kernel/drivers/char/ipmi/ipmi_devintf.ko
[  611s] dracut[D]: -rw-r--r--   1 root     root       146051 Apr 14 08:05 usr/lib/modules/6.14.2-1-default/kernel/drivers/char/ipmi/ipmi_msghandler.ko
[  611s] dracut[D]: -rw-r--r--   1 root     root        33211 Apr 14 08:05 usr/lib/modules/6.14.2-1-default/kernel/drivers/char/ipmi/ipmi_poweroff.ko
[  611s] dracut[D]: -rw-r--r--   1 root     root       178883 Apr 14 08:05 usr/lib/modules/6.14.2-1-default/kernel/drivers/char/ipmi/ipmi_si.ko
[  611s] dracut[D]: -rw-r--r--   1 root     root        77371 Apr 14 08:05 usr/lib/modules/6.14.2-1-default/kernel/drivers/char/ipmi/ipmi_ssif.ko
[  611s] dracut[D]: -rw-r--r--   1 root     root        59123 Apr 14 08:05 usr/lib/modules/6.14.2-1-default/kernel/drivers/char/ipmi/ipmi_watchdog.ko
...
[  611s] dracut[D]: -rw-r--r--   1 root     root        38395 Apr 14 08:05 usr/lib/modules/6.14.2-1-default/kernel/drivers/usb/host/xhci-pci-renesas.ko
...
[  611s] dracut[D]: -rw-r--r--   1 root     root        23387 Apr 14 08:05 usr/lib/modules/6.14.2-1-default/kernel/drivers/block/brd.ko