[OE-core] [PATCH v5] do_image: Implement IMAGE_ROOTFS_EXCLUDE_PATH feature.

[Kristian Amlie]

On 23/08/17 14:47, Richard Purdie wrote:
> On Wed, 2017-08-23 at 14:39 +0200, Kristian Amlie wrote:
>> From: Kristian Amlie <kristian.amlie at mender.io>
>>
>> This is a direct followup from the earlier f6a064d969f414 commit in
>> wic. It works more or less the same way: The variable specifies a
>> list
>> of directories relative to the root of the rootfs, and these
>> directories will be excluded from the resulting rootfs image. If an
>> entry ends with a slash, only the contents are omitted, not the
>> directory itself.
>>
>> Since the intended use of the variable is to exclude certain
>> directories from the rootfs, and then include said directories in
>> other partitions, it is not natural for this variable to be respected
>> for image creators that create multi partition images. Therefore the
>> default is to ignore the variable, and image creators that create
>> single root filesystems need to set
>>
>>   do_image_myfs[respect_exclude_path] = "1"
>>
>> in order to honor it. Specifically, "wic" and "multiubi" have not
>> received this variable flag, while others have.
> 
> I have to wonder if this is implemented the correct way around. Would
> it not be better to mark multiubi and wic as not wanting this feature,
> rather than requiring every other image creation method (which may even
> be in other layers) to set this?

The idea was that people in downstream repositories (other layers) are
more likely to have their own complete image creators than to have
filesystem creators. So rather than requiring all of the downstream
repositories to opt out of the feature, we opt in in the filesystem
creators which are mostly contained in OE.

Or so was the thinking. Not sure if it's a good reason though. I can
invert the behavior if you think it's better!

-- 
Kristian