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[rubygems/rubygems] Default to a SOURCE_DATE_EPOCH of 315619200, to simplify reproducible builds.

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Ellen Marie Dash 2025-03-13 17:08:10 -04:00 • committed by Hiroshi SHIBATA
parent 4fe882e2c9
commit 6982b80a8b
Notes: git 2025-03-24 04:25:31 +00:00
3 changed files with 21 additions and 18 deletions
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15
lib/rubygems.rb
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@ -156,6 +156,13 @@ module Gem
specifications/default
].freeze
##
# The default value for SOURCE_DATE_EPOCH if not specified.
# We want a date after 1980-01-01, to prevent issues with Zip files.
# This particular timestamp is for 1980-01-02 00:00:00 GMT.
DEFAULT_SOURCE_DATE_EPOCH = 315_619_200
@@win_platform = nil
@configuration = nil
@ -1155,8 +1162,7 @@ An Array (#{env.inspect}) was passed in from #{caller[3]}
##
# If the SOURCE_DATE_EPOCH environment variable is set, returns it's value.
# Otherwise, returns the time that +Gem.source_date_epoch_string+ was
# first called in the same format as SOURCE_DATE_EPOCH.
# Otherwise, returns DEFAULT_SOURCE_DATE_EPOCH as a string.
#
# NOTE(@duckinator): The implementation is a tad weird because we want to:
# 1. Make builds reproducible by default, by having this function always
@ -1171,15 +1177,12 @@ An Array (#{env.inspect}) was passed in from #{caller[3]}
# https://reproducible-builds.org/specs/source-date-epoch/
def self.source_date_epoch_string
# The value used if $SOURCE_DATE_EPOCH is not set.
@default_source_date_epoch ||= Time.now.to_i.to_s
specified_epoch = ENV["SOURCE_DATE_EPOCH"]
# If it's empty or just whitespace, treat it like it wasn't set at all.
specified_epoch = nil if !specified_epoch.nil? && specified_epoch.strip.empty?
epoch = specified_epoch || @default_source_date_epoch
epoch = specified_epoch || DEFAULT_SOURCE_DATE_EPOCH.to_s
epoch.strip
end