systemd-boot tools like kernel-install expect a certain
entry naming policy. This commit adapts kiwi to adapt to
this policy. The name for the default entry is constructed
out of the ID information from /etc/os-release followed
by the name of the kernel as it is represented by the
directory name in /lib/modules/... This Fixes#2417
kernel-install does a lot more then making the kernel available
to the ESP. It calls dracut, it creates loader entries and all
that is unexpected and also breaks the boot because the way
dracut is called in the image build case where host != target
leads to broken results. This commit refactors the systemd-boot
support in kiwi to prevent the use of kernel-install
Bootloaders implementing the Boot Loader Spec (BLS) are not
directly compatible with the original Bootloader Class design
in kiwi. Because of that an interface class which translates
the original API into calls following BLS was added. This allows
us to keep the implementations in the Builder classes and the
public BootLoader interface untouched. In addition to the BLS
API an implementation to support the systemd-boot loader is
part of this commit too.
An example type definition to use systemd-boot with an EFI
disk image type looks like the following:
<type image="oem" filesystem="xfs" firmware="efi" bootloader="systemd_boot" efipartsize="200"/>
The implementation uses bootctl and kernel-install tools
provided from systemd and expects a proper integration
of systemd-boot by the distribution maintainers
This Fixes#1935
