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ref-manual: document SOURCE_DATE_EPOCH

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(From yocto-docs rev: 160d672641c52338ba499edfb66339a10b088490)

Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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Michael Opdenacker
2021-10-19 14:35:58 +02:00
committed by Richard Purdie
parent 07108739ce
commit 90b29420c7
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documentation/ref-manual/variables.rst
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@@ -6925,6 +6925,23 @@ system and gives an overview of their function and contents.
You will see this variable referenced in the default values of
``FILES:${PN}-dev``.
:term:`SOURCE_DATE_EPOCH`
This defines a date expressed in number of seconds since
the UNIX EPOCH (01 Jan 1970 00:00:00 UTC), which is used by
multiple build systems to force a timestamp in built binaries.
Many upstream projects already support this variable.
You will find more details in the `official specifications
<https://reproducible-builds.org/specs/source-date-epoch/>`__.
A value for each recipe is computed from the sources by
the :ref:`reproducible-build <ref-classes-reproducible-build>` class.
If a recipe wishes to override the default behavior, it should set its
own :term:`SOURCE_DATE_EPOCH` value::
SOURCE_DATE_EPOCH = "1613559011"
:term:`SOURCE_MIRROR_FETCH`
When you are fetching files to create a mirror of sources (i.e.
creating a source mirror), setting :term:`SOURCE_MIRROR_FETCH` to "1" in