[OE-core] [PATCH v2 0/3] Permit to install files from an overlay in images recipes

[Jérémy Rosen]

On 16/02/2017 03:18, Gary Thomas wrote:
> On 2017-02-15 18:33, Geoffrey Levillain wrote:
>> Hi,
>>
>> These patches introduce a capability to install overlay into image after
>> fetching them.
>>
>> There is actually a need to add image-specific configurations files into
>> image recipes, and these patches are a way to standardize this 
>> process as
>> well as simplify it by re-enabling fetching when image_overlay is
>> inherited, and by providing a task that copy every files in directories
>> listed in OVERLAY_ROOT_DIRS into IMAGE_ROOTFS directory.
>>
>> Geoffrey Levillain (3):
>>   image.bbclass: No need to force image licence on MIT
>>   image_overlay.bbclass: Add possibility to install overlays to image
>>   rm_work.bbclass: Do not remove fetching and install_overlay stamps
>>
>>  meta/classes/image.bbclass         |  2 +-
>>  meta/classes/image_overlay.bbclass | 24 ++++++++++++++++++++++++
>>  meta/classes/rm_work.bbclass       |  4 ++++
>>  3 files changed, 29 insertions(+), 1 deletion(-)
>>  create mode 100644 meta/classes/image_overlay.bbclass
>
> Can you give an example where this approach is better than just
> having the image include some [possibly optional] packages that
> contain these image-specific configuration files?
>
The problem is that most configuration files are provided by a package 
and thus can not be overriden by another package.
(a bbappend for each package we want to modify is a big amount of 
tweaking and would force a variant of the package for each image with a 
different configuration)
A "configuration package" can only add new conf files, it can't alter 
existing files.

Regards
Jérémy

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