So far kiwi was looking up kernels only on /boot. Including
other bootloaders it's no longer required that the kernel
packages of the distributions provides the kernel in /boot
Thus kiwi's lookup needs to be extended to other places
which is done by this commit.
If an image is build without a kernel kiwi fails due to
some code paths expecting the presence of kernel modules
and or kernel binaries. This commit fixes this and allows
creating an image without installing a kernel.
For the lookup of the kernel version kiwi provided a small
C program that reads the first bytes of the kernel binary
and extracts the version information. Given the various
compression formats and also the problem of kernel files
that contains the decompressor code which could be anything
it has turned out to be difficult to provide a stable tool
to read the version from the binary. Therefore the code in
kiwi was refactored to read the version via regexp match
from the filename which also makes kversion an obsolete
tool. This Fixes#1308
Lookup of the kernel version is done by directly reading the
kernel image via a small tool named kversion. The scope of the
tool is limited and does not work for e.g kernel images which
contains its own decompressor code. For the special cases we
defined exceptions, one was zImage. The recently added exception
for vmlinuz seemed too intrusive to me and was also not well
documented. This patch tries to clarify and get us back to
explicit and easy to read coding. Fixes#899
Due to the workaround to lookup the gzip compressed variant
of a zImage to find its version, it's required to find the
full name of the zImage in order to rematch the gzip variant.
Looking at the zImage link will make this to fail because
there is no vmlinux link
kernels build as zImage contains the decompressor code
as part of the kernel image and could be therefore
compressed by any possible compression algorithm.
In this case we assume/hope that there is also a
standard gz compressed vmlinux version of the kernel
available and check this one instead of the zImage
variant. Fixes#587
If multiple abi compatible kernel module packages are installed
the kernel version of the boot kernel could be different from
the kernel module versions. In order to find the boot kernel
all kernel versions found must be checked. Fixes#355
The Kernel instance is the only correct place to ask
for the kernel name. This class has the responsibility
to know information about the selected kernel. The
additional arch based assumption on the kernel name
in the disk builder were wrong. This fixes bnc#1011936
Complete the list of kernel names for the lookup. Normally
the kernel package provides a symlink to the actual kernel
image file. However if the link does not exist we extend the
search to a collection of names for possible kernel images.
The new list now also covers kernel names as used for arm
Along with the change this patch also provides an option to
raise an exception if the kernel lookup did not find any
kernel, which is used for the get_kernel() request in the
dracut initrd system setup where it is mandatory to find
a kernel image.
This fixes bnc#1010874
