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Yocto layer review

Skill Higangssh/yocto-agent-skills/skills/yocto-layer-review

Official-doc-first Yocto Project and BitBake skills for AI coding agents

Install
npx -y skills add Higangssh/yocto-agent-skills --skill yocto-layer-review

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Review Yocto/OpenEmbedded layer structure, layer.conf, BBFILE collections and patterns, LAYERSERIES_COMPAT, LAYERDEPENDS, BBFILE_PRIORITY, BBFILES_DYNAMIC, bbappend matching, overlayed recipes, provider selection, and layer compatibility. Use for layer creation, layer migration, layer review, or when a bbappend/recipe is not being applied.

SKILL.md

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Yocto Layer Review

Use this skill to review layers and diagnose metadata visibility problems. Layer issues often look like recipe, provider, or package failures; prove whether BitBake sees the metadata first.

Required Evidence

Ask for or inspect:

conf/layer.conf
conf/bblayers.conf
bitbake-layers show-layers
bitbake-layers show-recipes <recipe>
bitbake-layers show-appends
bitbake-layers show-overlayed

Layer Checklist

Review:

BBPATH .= ":${LAYERDIR}"
BBFILES += "${LAYERDIR}/recipes-*/*/*.bb ${LAYERDIR}/recipes-*/*/*.bbappend"
BBFILE_COLLECTIONS += "mylayer"
BBFILE_PATTERN_mylayer = "^${LAYERDIR}/"
BBFILE_PRIORITY_mylayer = "6"
LAYERSERIES_COMPAT_mylayer = "scarthgap walnascar"
LAYERDEPENDS_mylayer = "core"

Check:

  • collection name is unique and stable
  • LAYERSERIES_COMPAT_* matches the target release
  • required layers are declared with LAYERDEPENDS_*
  • recipe and append globs cover intended files
  • BBFILE_PRIORITY_* is not used to hide provider/version policy problems
  • optional bbappends use BBFILES_DYNAMIC when the target layer may be absent
  • .bbappend filename matches an existing recipe version or intentionally uses %

Common Problems

  • layer is present in the tree but missing from bblayers.conf
  • .bbappend silently not applied due to recipe version mismatch
  • collection name in BBFILES_DYNAMIC does not match target layer collection
  • layer priority causes a recipe to win unexpectedly
  • vendor BSP layer pins an older release and rejects modern syntax
  • dependency layer missing even though a recipe path exists locally

References

Output

Answer with:

  1. whether BitBake sees the layer and append
  2. exact layer.conf or filename issue
  3. metadata visibility command to prove it
  4. minimal fix
  5. validation command

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