From: Chris Lamb Date: Thu, 27 Jul 2023 11:50:03 +0200 Subject: Make the build reproducible Whilst working on the Reproducible Builds effort [0], we noticed that unity-java could not be built reproducibly. This is because it shipped a 'STAMP' file within the .jar that contained the current build date. I'm not convinced by the value of including this file, but a patch is attached that ensures that the content of this file is based on the value of SOURCE_DATE_EPOCH if it is available. --- src/java/Makefile.in | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/src/java/Makefile.in b/src/java/Makefile.in index 32f035a..8cbc2aa 100644 --- a/src/java/Makefile.in +++ b/src/java/Makefile.in @@ -27,6 +27,11 @@ prefix=@prefix@ exec_prefix=@exec_prefix@ javadir=@datarootdir@/java +ifdef SOURCE_DATE_EPOCH + BUILD_DATE ?= $(shell date -u -d "@$(SOURCE_DATE_EPOCH)" 2>/dev/null || date -u -r "$(SOURCE_DATE_EPOCH)" 2>/dev/null || date -u) +else + BUILD_DATE ?= $(shell date) +endif all: unity.jar @@ -43,7 +48,7 @@ unity.jar: build/$(CP)/UnitParser.class build/$(CP)/util/SimpleCSVReader.class build/STAMP: mkdir -p build/jdk mkdir -p gen/$(CP) - date >build/STAMP + echo $(BUILD_DATE) >build/STAMP build/$(CP)/UnitParser.class: $(CP)/UnitParser.java \ $(CP)/OneUnit.java \