File ovmf-EmbeddedPkg-Library-Support-SOURCE_DATE_EP... of Package ovmf

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File ovmf-EmbeddedPkg-Library-Support-SOURCE_DATE_EPOCH-in-Vir.patch of Package ovmf (Revision 117a8017fee92a57eaf3ebe80d00d985)

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From 441bc6b75c8edcfa825b324e05f7cd838feac2bb Mon Sep 17 00:00:00 2001
From: "Lee, Chun-Yi" <jlee@suse.com>
Date: Thu, 11 Apr 2024 19:36:30 +0800
Subject: [PATCH] EmbeddedPkg/Library: Support SOURCE_DATE_EPOCH in
 VirtualRealTimeClockLib for reproducible

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/
Signed-off-by: Lee, Chun-Yi <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 5d0f867eb6..0bd6bcee75 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` 
-- 
2.44.0

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File ovmf-EmbeddedPkg-Library-Support-SOURCE_DATE_EPOCH-in-Vir.patch of Package ovmf (Revision 117a8017fee92a57eaf3ebe80d00d985)

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