Re: [OE-core] [PATCH v4 0/1] wic: extra partition plugin

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

Hi Pierre-Loup,

On Thu Oct 2, 2025 at 4:45 PM CEST, Pierre-loup GOSSE via lists.openembedded.org wrote:
> From: Pierre-Loup GOSSE <pierre-loup.gosse@smile.fr>
>
> Some files are not part of the root filesystem and must be installed in a
> separate partition. This is already handled for boot files by the
> bootimg_partition plugin and its IMAGE_BOOT_FILES BitBake variable.
>
> This patch introduces a similar approach for generic "extra" files. A new
> extra_partition plugin is added, which populates a partition with files
> listed in the new IMAGE_EXTRA_PARTITION_FILES BitBake variable. Like the
> bootimg_partition plugin, files should be deployed to the DEPLOY_DIR_IMAGE
> directory.
>
> The plugin supports:
>  - Glob pattern matching for file selection.
>  - File renaming.
>  - Suffixes to specify the target partition (by label, UUID, or partname),
>    enabling multiple extra partitions to coexist, similar to the
>    bootimg_partition plugin.
>
> For example, with the following (simplified) wks file:
>   part / --source extra_partition --fstype=ext4 --label foo --size 5M
>   part / --source extra_partition --fstype=ext4 --uuid e7d0824e-cda3-4bed-9f54-9ef5312d105d --size 5M
>   part / --source extra_partition --fstype=ext4 --label bar --size 5M
>
> And this configuration:
>   IMAGE_EXTRA_PARTITION_FILES_label-foo = "bar.conf;foo.conf"
>   IMAGE_EXTRA_PARTITION_FILES_uuid-e7d0824e-cda3-4bed-9f54-9ef5312d105d = "bar.conf;foobar.conf"
>   IMAGE_EXTRA_PARTITION_FILES = "foo/*"
>   WICVARS:append = "\
>       IMAGE_EXTRA_PARTITION_FILES_label-foo \
>       IMAGE_EXTRA_PARTITION_FILES_uuid-e7d0824e-cda3-4bed-9f54-9ef5312d105d \
>   "
>
> The file bar.conf is installed as foo.conf in the first partition, as
> foobar.conf in the second partition, and the last partition installs all
> files from the foo directory.

This was merged on master. Could you send a docs patch documenting the new
variable in ref-manual/variables.rst?

Thanks,
Antonin

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