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[0/1] wic: extra partition plugin

Message ID 20250924124611.3186960-1-pierre-loup.gosse@smile.fr
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Series wic: extra partition plugin | expand

Message

Pierre-loup GOSSE Sept. 24, 2025, 12:46 p.m. UTC 
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_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_FILES_label-foo = "bar.conf;foo.conf"
  IMAGE_EXTRA_FILES_uuid-e7d0824e-cda3-4bed-9f54-9ef5312d105d = "bar.conf;foobar.conf"
  IMAGE_EXTRA_FILES = "foo/*"
  WICVARS:append = "\
      IMAGE_EXTRA_FILES_label-foo \
      IMAGE_EXTRA_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.

Pierre-Loup GOSSE (1):
  wic: extra partition plugin

 meta/classes-recipe/image_types_wic.bbclass   |   1 +
 meta/lib/oeqa/selftest/cases/wic.py           |  40 ++++++
 .../lib/wic/plugins/source/extra_partition.py | 133 ++++++++++++++++++
 3 files changed, 174 insertions(+)
 create mode 100644 scripts/lib/wic/plugins/source/extra_partition.py