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ref-manual: document image-specific variant of INCOMPATIBLE_LICENSE

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This has been around without being properly documented since 2019 (!!!),
and is nowadays the preferred method for enforcing license restrictions,
especially since meta-gplv2 is officially obsolete.

(From yocto-docs rev: efa1c57ecec934998792b7851b4a162be92c8b23)

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Reviewed-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Alexander Kanavin
2023-07-28 18:50:26 +02:00
committed by Richard Purdie
parent e100e3e0b3
commit 6f361c81ba
2 changed files with 20 additions and 9 deletions
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documentation/ref-manual/variables.rst
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@@ -3929,9 +3929,18 @@ system and gives an overview of their function and contents.
:term:`INCOMPATIBLE_LICENSE`
Specifies a space-separated list of license names (as they would
appear in :term:`LICENSE`) that should be excluded
from the build. Recipes that provide no alternatives to listed
from the build (if set globally), or from an image (if set locally
in an image recipe).
When the variable is set globally, recipes that provide no alternatives to listed
incompatible licenses are not built. Packages that are individually
licensed with the specified incompatible licenses will be deleted.
licensed with the specified incompatible licenses will be deleted.
Most of the time this does not allow a feasible build (because it becomes impossible
to satisfy build time dependencies), so the recommended way to
implement license restrictions is to set the variable in specific
image recipes where the restrictions must apply. That way there
are no build time restrictions, but the license check is still
performed when the image's filesystem is assembled from packages.
There is some support for wildcards in this variable's value,
however it is restricted to specific licenses. Currently only