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ref-manual: Add a tips on how to achieve whitelisting of licenses

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It is sometimes more appropriate to define the licenses that are
allowed to be used rather than the ones that are not permitted. This
adds a tips on how this can be achieved by using AVAILABLE_LICENSES
and some Python set arithmetics.

(From yocto-docs rev: dd26d8a9f89402a9828bf02f2e65054d4c0f406f)

Signed-off-by: Peter Kjellerstedt <peter.kjellerstedt@axis.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Peter Kjellerstedt 2020-02-20 21:27:33 +01:00 committed by Richard Purdie
parent cc26e90a79
commit 0daf901b5b
1 changed files with 19 additions and 0 deletions
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documentation/ref-manual/ref-variables.xml
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@ -6774,6 +6774,25 @@
components that are required to produce a functional system
image.
</note>
<note><title>Tips</title>
It is possible to define a list of licenses that are allowed
to be used instead of the licenses that are excluded. To do
this, define a
variable <filename>COMPATIBLE_LICENSES</filename> with the
names of the licences that are allowed. Then
define <filename>INCOMPATIBLE_LICENSE</filename> as:
<literallayout class='monospaced'>
INCOMPATIBLE_LICENSE = "${@' '.join(sorted(set(d.getVar('AVAILABLE_LICENSES').split()) - set(d.getVar('COMPATIBLE_LICENSES').split())))}"
</literallayout>
This will result
in <filename>INCOMPATIBLE_LICENSE</filename> containing the
names of all licences
from <link linkend='var-AVAILABLE_LICENSES'><filename>AVAILABLE_LICENSES</filename></link>
except the ones specified
in <filename>COMPATIBLE_LICENSES</filename>, thus only
allowing the latter licences to be used.
</note>
</glossdef>
</glossentry>