'IMAGE_FEATURES' in Isar

[Claudius Heine <claudius.heine.ext@siemens.com>]

Hi,

since we discussed that we might want to implement 'IMAGE_FEATURES' in 
Isar in order to support images without kernel, I wanted to start some 
brainstorming about what this should be used in other cases.

While discussing that with Jan we came some ideas that would be nice to 
be implemented as features:

   - Cleanup steps like localepurge, and apt-get clean
   - Removal of apt and other possible reduction tasks
   - ??? other ideas?

About installing the kernel: It could be possible to have some 
'nokernel' feature, but I am currently not sure if that is right.
Debians 'debootstrap' does not install a kernel per default, so if we 
now have a kernel per opt-out we are a bit in a conflict with the 
'Debian-Way-Of-Life' IMO. Because there even the kernel is a opt-in 
package. Of course most images created by Isar will have a kernel, so I 
also see that reason for including one.

The other question might be if having a kernel should be implemented as 
a IMAGE_FEATURE or rather a setting in the machine.conf? In the simplest 
solution maybe something like:

   machine.conf:
   KERNEL='yes'

while the multiconfig specifies which kernel to use and the distro what 
kernels are available, like it does today.

What do you think?

Thanks,
Claudius

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