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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: 40d3cb5257fea3669efe28e534e5f9479a2837b3)

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Reviewed-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
This commit is contained in:
Alexander Kanavin
2023-07-28 18:50:26 +02:00
committed by Steve Sakoman
parent 998d1cf1d9
commit 21be91b403
2 changed files with 20 additions and 9 deletions
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documentation/ref-manual/images.rst
+9 -7
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@@ -14,15 +14,17 @@ image you want.
Building an image without GNU General Public License Version 3 Building an image without GNU General Public License Version 3
(GPLv3), GNU Lesser General Public License Version 3 (LGPLv3), and (GPLv3), GNU Lesser General Public License Version 3 (LGPLv3), and
the GNU Affero General Public License Version 3 (AGPL-3.0) components the GNU Affero General Public License Version 3 (AGPL-3.0) components
is only supported for minimal and base images. Furthermore, if you is only tested for core-image-minimal image. Furthermore, if you would like to
are going to build an image using non-GPLv3 and similarly licensed build an image and verify that it does not include GPLv3 and similarly licensed
components, you must make the following changes in the ``local.conf`` components, you must make the following changes in the image recipe
file before using the BitBake command to build the minimal or base file before using the BitBake command to build the image:
image:
#. Comment out the :term:`EXTRA_IMAGE_FEATURES` line INCOMPATIBLE_LICENSE = "GPL-3.0* LGPL-3.0*"
#. Set :term:`INCOMPATIBLE_LICENSE` to "GPL-3.0* LGPL-3.0* AGPL-3.0*" Alternatively, you can adjust ``local.conf`` file, repeating and adjusting the line
for all images where the license restriction must apply:
INCOMPATIBLE_LICENSE:pn-your-image-name = "GPL-3.0* LGPL-3.0*"
From within the ``poky`` Git repository, you can use the following From within the ``poky`` Git repository, you can use the following
command to display the list of directories within the :term:`Source Directory` command to display the list of directories within the :term:`Source Directory`
documentation/ref-manual/variables.rst
+11 -2
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@@ -3845,9 +3845,18 @@ system and gives an overview of their function and contents.
:term:`INCOMPATIBLE_LICENSE` :term:`INCOMPATIBLE_LICENSE`
Specifies a space-separated list of license names (as they would Specifies a space-separated list of license names (as they would
appear in :term:`LICENSE`) that should be excluded 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 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, There is some support for wildcards in this variable's value,
however it is restricted to specific licenses. Currently only however it is restricted to specific licenses. Currently only