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[build] Use SOURCE_DATE_EPOCH if it exists 

See https://reproducible-builds.org/docs/source-date-epoch/ for
rationale.

Modified-by: Michael Brown <mcb30@ipxe.org>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/242/head
Manuel Mendez 2021-01-15 21:29:27 -05:00 committed by Michael Brown
parent 6c91eebd0a
commit 9d000c9fd7
1 changed files with 12 additions and 0 deletions
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12
src/Makefile.housekeeping
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@ -1167,7 +1167,19 @@ BUILD_ID_CMD := perl -e 'printf "0x%08x", int ( rand ( 0xffffffff ) );'
# Build timestamp
#
# Used as a means to automatically select the newest version of iPXE
# if multiple iPXE drivers are loaded concurrently in a UEFI system.
#
# It gets rounded down to the nearest minute when used for this
# purpose.
#
ifdef SOURCE_DATE_EPOCH
BUILD_TIMESTAMP := $(SOURCE_DATE_EPOCH)
else ifdef GITVERSION
BUILD_TIMESTAMP := $(shell git log -1 --pretty=%ct)
else
BUILD_TIMESTAMP := $(shell date +%s)
endif
# Build version
#