[edk2-devel] [PATCH] EmbeddedPkg/VirtualRealTimeClockLib: Support SOURCE_DATE_EPOCH

["Lee, Chun-Yi" <joeyli.kernel@gmail.com>]

From: Chun-Yi Lee <jlee@suse.com>

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: Chun-Yi Lee <jlee@suse.com>
---
 .../Library/VirtualRealTimeClockLib/VirtualRealTimeClockLib.inf | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/EmbeddedPkg/Library/VirtualRealTimeClockLib/VirtualRealTimeClockLib.inf b/EmbeddedPkg/Library/VirtualRealTimeClockLib/VirtualRealTimeClockLib.inf
index 5d0f867..285e880 100644
--- a/EmbeddedPkg/Library/VirtualRealTimeClockLib/VirtualRealTimeClockLib.inf
+++ b/EmbeddedPkg/Library/VirtualRealTimeClockLib/VirtualRealTimeClockLib.inf
@@ -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`
-- 
2.35.3



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