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| -rw-r--r-- | documentation/ref-manual/variables.rst | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/documentation/ref-manual/variables.rst b/documentation/ref-manual/variables.rst index cc55f33d98..53a8ee50a2 100644 --- a/documentation/ref-manual/variables.rst +++ b/documentation/ref-manual/variables.rst @@ -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 |