File reproducibletar.patch of Package mp

Author: Bernhard M. Wiedemann <bwiedemann suse de>
Date: 2025-06-02

Make tar-file creation fully deterministic
using the snippet from
https://reproducible-builds.org/docs/archives/

note: will fail if SOURCE_DATE_EPOCH is not set.
If mtime does not matter, we can use '1' there instead.

This patch was done while working on reproducible builds for openSUSE.

diff --git a/makefile.in b/makefile.in
index 8ee95fd..289f849 100644
--- a/makefile.in
+++ b/makefile.in
@@ -37,7 +37,11 @@ dep:
 			-e 's;$(MPSL)/;$$(MPSL)/;g' > makefile.depend
 
 mp.tar: $(ARCHFILES)
-	$(TAR) cvf $@ $(ARCHFILES)
+	$(TAR) --sort=name \
+	  --mtime="@${SOURCE_DATE_EPOCH}" \
+	  --owner=0 --group=0 --numeric-owner \
+	  --pax-option=exthdr.name=%d/PaxHeaders/%f,delete=atime,delete=ctime \
+	  -cvf $@ $(ARCHFILES)
 
 mp.tar.o: mp.tar
 	$(LD) -r -b binary mp.tar -o $@