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ref-manual: expand documentation on image-buildinfo class

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Expand the documentation on the image-buildinfo class, and add variable
glossary entries for IMAGE_BUILDINFO_FILE, IMAGE_BUILDINFO_VARS and
SDK_BUILDINFO_FILE (latter is new in 4.1).

(From yocto-docs rev: f69b2f614aaa56a19432538cb1adf33a441ea31d)

Signed-off-by: Paul Eggleton <paul.eggleton@microsoft.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Paul Eggleton
2022-10-06 13:36:38 +13:00
committed by Richard Purdie
parent 500d5bc5c9
commit 8ba77dd403
2 changed files with 32 additions and 2 deletions
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documentation/ref-manual/classes.rst
+16 -2
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@@ -881,8 +881,22 @@ Yocto Project Overview and Concepts Manual.
``image-buildinfo.bbclass``
===========================
The ``image-buildinfo`` class writes information to the target
filesystem on ``/etc/build``.
The ``image-buildinfo`` class writes a plain text file containing
build information to the target filesystem at ``${sysconfdir}/buildinfo``
by default (as specified by :term:`IMAGE_BUILDINFO_FILE`.
This can be useful for manually determining the origin of any given
image. It writes out two sections:
1. `Build Configuration`: a list of variables and their values (specified
by :term:`IMAGE_BUILDINFO_VARS`, which defaults to :term:`DISTRO` and
:term:`DISTRO_VERSION`)
2. `Layer Revisions`: the revisions of all of the layers used in the
build.
Additionally, when building an SDK it will write the same contents
to ``/buildinfo`` by default (as specified by
:term:`SDK_BUILDINFO_FILE`).
.. _ref-classes-image_types: