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EmbeddedPkg/VirtualRealTimeClockLib: Support SOURCE_DATE_EPOCH

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RISC-V ovmf used VirtualRealTimeClockLib but the default epoch is a
compilation time. It causes that the RISC-V ovmf binary image is NOT
reproducible.

This patch added the support of SOURCE_DATE_EPOCH by printenv command.
If SOURCE_DATE_EPOCH be found then we use it as BUILD_EPOCH. Otherwise
we run date command for setting BUILD_EPOCH.

For distributions want a reproducible RISC-V ovmf image, they should
export SOURCE_DATE_EPOCH environment variable before building ovmf.

References: https://reproducible-builds.org/docs/source-date-epoch/
Cc: Pete Batard <pete@akeo.ie>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: "Lee, Chun-Yi" <jlee@suse.com>
This commit is contained in:
Chun-Yi Lee 2024-04-12 15:07:33 +08:00 committed by mergify[bot]
parent 8430c69dc1
commit 6852f6984b
1 changed files with 1 additions and 1 deletions
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EmbeddedPkg/Library/VirtualRealTimeClockLib/VirtualRealTimeClockLib.inf
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@ -34,4 +34,4 @@
# Current usage of this library expects GCC in a UNIX-like shell environment with the date command
[BuildOptions]
GCC:*_*_*_CC_FLAGS = -DBUILD_EPOCH=`date +%s`
GCC:*_*_*_CC_FLAGS = -DBUILD_EPOCH=`printenv SOURCE_DATE_EPOCH || date +%s`