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If an existing source date epoch file was found during do_unpack, it was deleted and a new one would be written in its place. This causes a race with check-before-use code in get_source_date_epoch_value. Resolve the problem by making do_unpack write the new source date epoch to a temporary file, then do an atomic rename to ensure it's always present, and change the check-before-use code to use a EAFP exception instead of checking for file existence. [YOCTO #14384] (From OE-Core rev: 0b5e3b33187bf78a2d62cc886463e4b27d6bd228) Signed-off-by: Joshua Watt <JPEWhacker@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>