Warning: bookworm support broken due to systemd packet split

["Bezdeka, Florian" <florian.bezdeka@siemens.com>]

Hi all,

when trying to update one of my internal targets from Debian bullseye
to bookworm I was surprised that the build was failing with the
following wic failure:

| Traceback (most recent call last):
|   File "/work/isar/scripts/wic", line 547, in <module>
|     sys.exit(main(sys.argv[1:]))
|   File "/work/isar/scripts/wic", line 542, in main
|     return hlp.invoke_subcommand(args, parser, hlp.wic_help_usage, subcommands)
|   File "/work/isar/scripts/lib/wic/help.py", line 83, in invoke_subcommand
|     subcmd[0](args, usage)
|   File "/work/isar/scripts/wic", line 222, in wic_create_subcommand
|     engine.wic_create(wks_file, rootfs_dir, bootimg_dir, kernel_dir,
|   File "/work/isar/scripts/lib/wic/engine.py", line 190, in wic_create
|     plugin.do_create()
|   File "/work/isar/scripts/lib/wic/plugins/imager/direct.py", line 98, in do_create
|     self.create()
|   File "/work/isar/scripts/lib/wic/plugins/imager/direct.py", line 182, in create
|     self._image.prepare(self)
|   File "/work/isar/scripts/lib/wic/plugins/imager/direct.py", line 360, in prepare
|     part.prepare(imager, imager.workdir, imager.oe_builddir,
|   File "/work/isar/scripts/lib/wic/partition.py", line 183, in prepare
|     plugin.do_prepare_partition(self, srcparams_dict, creator,
|   File "/work/isar/meta/scripts/lib/wic/plugins/source/bootimg-efi-isar.py", line 419, in do_prepare_partition
|     for mod in [x for x in os.listdir(kernel_dir) if x.startswith("systemd-")]:
| FileNotFoundError: [Errno 2] No such file or directory: '/build/tmp/work/debian-bookworm-amd64/talker-qemuamd64/1.0-r0/rootfs/usr/lib/systemd/boot/efi/'


It turns out that the systemd package is now split into different
packages, so the systemd-boot stuff that we use in the ISAR wic plugin
was moved into the systemd-boot-efi packet. With that we now have
additional dependencies. The systemd-boot stuff is no longer installed
"automatically".Debian changelog: 

systemd (251.2-3) unstable; urgency=medium

  systemd-boot has been split into a separate package.
  This new systemd-boot package will not be installed automatically on
  upgrades. If you are using systemd-boot, please install this new
  package manually.

  The default boot loader in Debian is grub2. If you have not set up
  systemd-boot manually, no action is required on your side.

 -- Michael Biebl <biebl@debian.org>  Wed, 08 Jun 2022 21:49:47 +0200


Why does the ISAR CI system not report that? We should really make sure
that Debian testing / bookworm is tested properly.

How to fix that? Similar to the SYSLINUX_BOOTLOADER_INSTALL stuff but
with IMAGE_PREINSTALL instead of IMAGER_INSTALL? It's a combination of
distribution (package name) and machine configuration (WKS file
selection).

Best regards,
Florian