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bpo-29708: support SOURCE_DATE_EPOCH env var in py_compile
to allow for reproducible builds of python packages See https://reproducible-builds.org/ for why this is good and https://reproducible-builds.org/specs/source-date-epoch/ for the definition of this variable. Background: In some distributions like openSUSE, binary rpms contain precompiled .pyc files. And packages like amqp or twisted dynamically generate .py files at build time so those have the current time and that timestamp gets embedded into the .pyc file header. When we then adapt file timestamps in rpms to be constant, the timestamp in the .pyc header will no more match the .py timestamp in the filesystem. The software will still work, but it will not use the .pyc file as it should.
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Misc/NEWS.d/next/Build/2017-09-07-04-20-49.bpo-29708.YCaHEx.rst
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If the SOURCE_DATE_EPOCH environment variable is set, | ||
py_compile will use it to override the timestamps it puts into .pyc files. |