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[rubygems/rubygems] Set SOURCE_DATE_EPOCH env var if not provided.

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Fixes #2290.

1. `Gem::Specification.date` returns SOURCE_DATE_EPOCH when defined,
2. this commit makes RubyGems set it _persistently_ when not provided.

This combination means that you can build a gem, check the build time,
and use that value to generate a new build -- and then verify they're
the same.

d830d53f59
This commit is contained in:
Ellen Marie Dash 2019-08-17 04:45:09 +00:00 • committed by Hiroshi SHIBATA
parent 8436b2717c
commit 508afe2c26
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6 changed files with 82 additions and 6 deletions
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lib/rubygems/specification.rb
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@ -1667,7 +1667,7 @@ class Gem::Specification < Gem::BasicSpecification
# https://reproducible-builds.org/specs/source-date-epoch/
def date
@date ||= ENV["SOURCE_DATE_EPOCH"] ? Time.utc(*Time.at(ENV["SOURCE_DATE_EPOCH"].to_i).utc.to_a[3..5].reverse) : TODAY
@date ||= Time.utc(*Gem.source_date_epoch.utc.to_a[3..5].reverse)
end
DateLike = Object.new # :nodoc: