Re: [OE-core] [PATCH v2 1/1] wic: extra partition plugin

["Antonin Godard" <antonin.godard@bootlin.com>]

On Thu Sep 25, 2025 at 2:43 PM CEST, Pierre-loup GOSSE via lists.openembedded.org wrote:
>>
>> in the past I have used to rootfs plugin with '--exclude-path' [1] and
>> '--change-directory' [2] assuming that I have isolated all files going in
>> to the extra partition in to one directory of rootfs.
>
> This is a solution when files are installed in the rootfs but need to be
> split across multiple partitions.
>
> However, some files aren't or shouldn’t be in the rootfs. For instance,
> I’ve worked on boards requiring a dedicated VFAT partition just for the
> U-Boot script. Other use cases include keeping business software separate
> from the rootfs, especially when they are installed and updated
> independently (with a SWU package).
> Pierre-Loup,

Why not install all the files in IMAGE_ROOTFS in a single image, then do the
filtering in the WKS?

What I do is:

  part rootfs --source rootfs --fstype=ext4 --exclude-path=data/ ...
  part data --source rootfs --rootfs-dir=${IMAGE_ROOTFS}/data ...

In this case the rootfs partition will not include the files in /data, and the
data partition will include them.

Antonin

-- 
Antonin Godard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com